diff --git a/.travis.yml b/.travis.yml
index 12f91096c..4bb0b1f9f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 sudo: required
 dist: trusty
 os: linux
-language: generic
+language: minimal
 cache:
   directories:
   - depends/built
@@ -24,17 +24,19 @@ env:
 # ARM
     - HOST=arm-linux-gnueabihf PACKAGES="g++-arm-linux-gnueabihf" DEP_OPTS="NO_QT=1" CHECK_DOC=1 GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat --enable-reduce-exports"
 # Win32
-    - HOST=i686-w64-mingw32 DPKG_ADD_ARCH="i386" DEP_OPTS="NO_QT=1" PACKAGES="python3 nsis g++-mingw-w64-i686 wine1.6 bc" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-reduce-exports"
+    - HOST=i686-w64-mingw32 DPKG_ADD_ARCH="i386" DEP_OPTS="NO_QT=1" PACKAGES="python3 nsis g++-mingw-w64-i686 wine1.6" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-reduce-exports"
+# Qt4 & system libs
+    - HOST=x86_64-unknown-linux-gnu PACKAGES="python3-zmq qt4-dev-tools libssl-dev libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-program-options-dev libboost-test-dev libboost-thread-dev libdb5.1++-dev libminiupnpc-dev libzmq3-dev libprotobuf-dev protobuf-compiler libqrencode-dev xvfb" NO_DEPENDS=1 NEED_XVFB=1 RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --with-incompatible-bdb --enable-glibc-back-compat --enable-reduce-exports --with-gui=qt4 CPPFLAGS=-DDEBUG_LOCKORDER"
 # 32-bit + dash
-    - HOST=i686-pc-linux-gnu PACKAGES="g++-multilib bc python3-zmq" DEP_OPTS="NO_QT=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports LDFLAGS=-static-libstdc++" USE_SHELL="/bin/dash"
+    - HOST=i686-pc-linux-gnu PACKAGES="g++-multilib python3-zmq" DEP_OPTS="NO_QT=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports LDFLAGS=-static-libstdc++" USE_SHELL="/bin/dash"
 # Win64
-    - HOST=x86_64-w64-mingw32 DPKG_ADD_ARCH="i386" DEP_OPTS="NO_QT=1" PACKAGES="python3 nsis g++-mingw-w64-x86-64 wine1.6 bc" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-reduce-exports"
+    - HOST=x86_64-w64-mingw32 DPKG_ADD_ARCH="i386" DEP_OPTS="NO_QT=1" PACKAGES="python3 nsis g++-mingw-w64-x86-64 wine1.6" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-reduce-exports"
 # x86_64 Linux (uses qt5 dev package instead of depends Qt to speed up build and avoid timeout)
     - HOST=x86_64-unknown-linux-gnu PACKAGES="python3-zmq qtbase5-dev qttools5-dev-tools protobuf-compiler libdbus-1-dev libharfbuzz-dev" DEP_OPTS="NO_QT=1 NO_UPNP=1 DEBUG=1 ALLOW_HOST_PACKAGES=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --with-gui=qt5 --enable-glibc-back-compat --enable-reduce-exports CPPFLAGS=-DDEBUG_LOCKORDER"
 # x86_64 Linux, No wallet
     - HOST=x86_64-unknown-linux-gnu PACKAGES="python3" DEP_OPTS="NO_WALLET=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat --enable-reduce-exports"
 # Cross-Mac
-    - HOST=x86_64-apple-darwin11 PACKAGES="cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python-dev" BITCOIN_CONFIG="--enable-gui --enable-reduce-exports" OSX_SDK=10.11 GOAL="deploy"
+    - HOST=x86_64-apple-darwin11 PACKAGES="cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python-dev" BITCOIN_CONFIG="--enable-gui --enable-reduce-exports --enable-werror" OSX_SDK=10.11 GOAL="deploy"
 
 before_install:
     - export PATH=$(echo $PATH | tr ':' "\n" | sed '/\/opt\/python/d' | tr "\n" ":" | sed "s|::|:|g")
@@ -43,13 +45,17 @@ install:
     - if [ -n "$PACKAGES" ]; then travis_retry sudo apt-get update; fi
     - if [ -n "$PACKAGES" ]; then travis_retry sudo apt-get install --no-install-recommends --no-upgrade -qq $PACKAGES; fi
 before_script:
-    - if [ "$TRAVIS_EVENT_TYPE" = "pull_request" ]; then contrib/devtools/commit-script-check.sh $TRAVIS_COMMIT_RANGE; fi
-    - unset CC; unset CXX
+    - if [ "$CHECK_DOC" = 1 -a "$TRAVIS_EVENT_TYPE" = "pull_request" ]; then contrib/devtools/commit-script-check.sh $TRAVIS_COMMIT_RANGE; fi
     - if [ "$CHECK_DOC" = 1 ]; then contrib/devtools/check-doc.py; fi
+    - if [ "$CHECK_DOC" = 1 ]; then contrib/devtools/check-rpc-mappings.py .; fi
+    - if [ "$CHECK_DOC" = 1 ]; then contrib/devtools/lint-all.sh; fi
+    - unset CC; unset CXX
     - mkdir -p depends/SDKs depends/sdk-sources
     - if [ -n "$OSX_SDK" -a ! -f depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz ]; then curl --location --fail $SDK_URL/MacOSX${OSX_SDK}.sdk.tar.gz -o depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz; fi
     - if [ -n "$OSX_SDK" -a -f depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz ]; then tar -C depends/SDKs -xf depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz; fi
-    - make $MAKEJOBS -C depends HOST=$HOST $DEP_OPTS
+    - if [ -z "$NO_DEPENDS" ]; then make $MAKEJOBS -C depends HOST=$HOST $DEP_OPTS; fi
+    # Start xvfb if needed, as documented at https://docs.travis-ci.com/user/gui-and-headless-browsers/#Using-xvfb-to-Run-Tests-That-Require-a-GUI
+    - if [ "$NEED_XVFB" = 1 ]; then export DISPLAY=:99.0; /sbin/start-stop-daemon --start --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -ac; fi
 script:
     - if [ "$CHECK_DOC" = 1 -a "$TRAVIS_REPO_SLUG" = "bitcoin/bitcoin" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then while read LINE; do travis_retry gpg --keyserver hkp://subset.pool.sks-keyservers.net --recv-keys $LINE; done < contrib/verify-commits/trusted-keys; fi
     - if [ "$CHECK_DOC" = 1 -a "$TRAVIS_REPO_SLUG" = "bitcoin/bitcoin" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then git fetch --unshallow; fi
@@ -58,7 +64,7 @@ script:
     - if [ -n "$USE_SHELL" ]; then export CONFIG_SHELL="$USE_SHELL"; fi
     - OUTDIR=$BASE_OUTDIR/$TRAVIS_PULL_REQUEST/$TRAVIS_JOB_NUMBER-$HOST
     - BITCOIN_CONFIG_ALL="--disable-dependency-tracking --prefix=$TRAVIS_BUILD_DIR/depends/$HOST --bindir=$OUTDIR/bin --libdir=$OUTDIR/lib"
-    - depends/$HOST/native/bin/ccache --max-size=$CCACHE_SIZE
+    - if [ -z "$NO_DEPENDS" ]; then depends/$HOST/native/bin/ccache --max-size=$CCACHE_SIZE; fi
     - test -n "$USE_SHELL" && eval '"$USE_SHELL" -c "./autogen.sh"' || ./autogen.sh
     - mkdir build && cd build
     - ../configure --cache-file=config.cache $BITCOIN_CONFIG_ALL $BITCOIN_CONFIG || ( cat config.log && false)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4e67af627..aed6d7954 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -81,6 +81,10 @@ Examples:
     Qt: Add feed bump button
     Trivial: Fix typo in init.cpp
 
+Note that translations should not be submitted as pull requests, please see
+[Translation Process](https://github.com/bitcoin/bitcoin/blob/master/doc/translation_process.md) 
+for more information on helping with translations.
+
 If a pull request is specifically not to be considered for merging (yet) please
 prefix the title with [WIP] or use [Tasks Lists](https://help.github.com/articles/basic-writing-and-formatting-syntax/#task-lists)
 in the body of the pull request to indicate tasks are pending.
@@ -153,6 +157,14 @@ behaviour of code within the pull request (bugs must be preserved as is).
 Project maintainers aim for a quick turnaround on refactoring pull requests, so
 where possible keep them short, uncomplex and easy to verify.
 
+Pull requests that refactor the code should not be made by new contributors. It
+requires a certain level of experience to know where the code belongs to and to
+understand the full ramification (including rebase effort of open pull requests).
+
+Trivial pull requests or pull requests that refactor the code with no clear
+benefits may be immediately closed by the maintainers to reduce unnecessary
+workload on reviewing.
+
 
 "Decision Making" Process
 -------------------------
diff --git a/COPYING b/COPYING
index c6203c0f7..45d51c3c7 100644
--- a/COPYING
+++ b/COPYING
@@ -1,6 +1,7 @@
 The MIT License (MIT)
 
 Copyright (c) 2009-2017 The Bitcoin Core developers
+Copyright (c) 2009-2017 Bitcoin Developers
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/Makefile.am b/Makefile.am
index 8216b7d60..a7092bb33 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -9,7 +9,6 @@ SUBDIRS += doc/man
 endif
 .PHONY: deploy FORCE
 
-GZIP_ENV="-9n"
 export PYTHONPATH
 
 if BUILD_BITCOIN_LIBS
@@ -44,6 +43,9 @@ DIST_CONTRIB = $(top_srcdir)/contrib/bitcoin-cli.bash-completion \
 	       $(top_srcdir)/contrib/bitcoind.bash-completion \
 	       $(top_srcdir)/contrib/init \
 	       $(top_srcdir)/contrib/rpm
+DIST_SHARE = \
+  $(top_srcdir)/share/genbuild.sh \
+  $(top_srcdir)/share/rpcuser
 
 BIN_CHECKS=$(top_srcdir)/contrib/devtools/symbol-check.py \
            $(top_srcdir)/contrib/devtools/security-check.py
@@ -213,7 +215,7 @@ endif
 
 dist_noinst_SCRIPTS = autogen.sh
 
-EXTRA_DIST = $(top_srcdir)/share/genbuild.sh test/functional/test_runner.py test/functional $(DIST_CONTRIB) $(DIST_DOCS) $(WINDOWS_PACKAGING) $(OSX_PACKAGING) $(BIN_CHECKS)
+EXTRA_DIST = $(DIST_SHARE) test/functional/test_runner.py test/functional $(DIST_CONTRIB) $(DIST_DOCS) $(WINDOWS_PACKAGING) $(OSX_PACKAGING) $(BIN_CHECKS)
 
 EXTRA_DIST += \
     test/util/bitcoin-util-test.py \
@@ -249,6 +251,7 @@ EXTRA_DIST += \
     test/util/data/txcreatemultisig3.json \
     test/util/data/txcreatemultisig4.hex \
     test/util/data/txcreatemultisig4.json \
+    test/util/data/txcreatemultisig5.json \
     test/util/data/txcreateoutpubkey1.hex \
     test/util/data/txcreateoutpubkey1.json \
     test/util/data/txcreateoutpubkey2.hex \
diff --git a/configure.ac b/configure.ac
index 4be320068..48d58d7ae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 dnl require autoconf 2.60 (AS_ECHO/AS_ECHO_N)
 AC_PREREQ([2.60])
 define(_CLIENT_VERSION_MAJOR, 0)
-define(_CLIENT_VERSION_MINOR, 14)
+define(_CLIENT_VERSION_MINOR, 15)
 define(_CLIENT_VERSION_REVISION, 99)
 define(_CLIENT_VERSION_BUILD, 0)
 define(_CLIENT_VERSION_IS_RELEASE, false)
@@ -177,14 +177,14 @@ AC_ARG_ENABLE([glibc-back-compat],
   [use_glibc_compat=$enableval],
   [use_glibc_compat=no])
 
-AC_ARG_ENABLE([experimental-asm],
-  [AS_HELP_STRING([--enable-experimental-asm],
-  [Enable experimental assembly routines (default is no)])],
-  [experimental_asm=$enableval],
-  [experimental_asm=no])
+AC_ARG_ENABLE([asm],
+  [AS_HELP_STRING([--enable-asm],
+  [Enable assembly routines (default is yes)])],
+  [use_asm=$enableval],
+  [use_asm=yes])
 
-if test "x$experimental_asm" = xyes; then
-  AC_DEFINE(EXPERIMENTAL_ASM, 1, [Define this symbol to build in experimental assembly routines])
+if test "x$use_asm" = xyes; then
+  AC_DEFINE(USE_ASM, 1, [Define this symbol to build in assembly routines])
 fi
 
 AC_ARG_WITH([system-univalue],
@@ -1179,7 +1179,7 @@ AM_CONDITIONAL([USE_LCOV],[test x$use_lcov = xyes])
 AM_CONDITIONAL([GLIBC_BACK_COMPAT],[test x$use_glibc_compat = xyes])
 AM_CONDITIONAL([HARDEN],[test x$use_hardening = xyes])
 AM_CONDITIONAL([ENABLE_HWCRC32],[test x$enable_hwcrc32 = xyes])
-AM_CONDITIONAL([EXPERIMENTAL_ASM],[test x$experimental_asm = xyes])
+AM_CONDITIONAL([USE_ASM],[test x$use_asm = xyes])
 
 AC_DEFINE(CLIENT_VERSION_MAJOR, _CLIENT_VERSION_MAJOR, [Major version])
 AC_DEFINE(CLIENT_VERSION_MINOR, _CLIENT_VERSION_MINOR, [Minor version])
@@ -1231,6 +1231,7 @@ AC_SUBST(QR_LIBS)
 AC_CONFIG_FILES([Makefile src/Makefile doc/man/Makefile share/setup.nsi share/qt/Info.plist test/config.ini])
 AC_CONFIG_FILES([contrib/devtools/split-debug.sh],[chmod +x contrib/devtools/split-debug.sh])
 AC_CONFIG_FILES([doc/Doxyfile])
+AC_CONFIG_LINKS([contrib/filter-lcov.py:contrib/filter-lcov.py])
 AC_CONFIG_LINKS([test/functional/test_runner.py:test/functional/test_runner.py])
 AC_CONFIG_LINKS([test/util/bitcoin-util-test.py:test/util/bitcoin-util-test.py])
 
@@ -1261,7 +1262,7 @@ if test x$need_bundled_univalue = xyes; then
   AC_CONFIG_SUBDIRS([src/univalue])
 fi
 
-ac_configure_args="${ac_configure_args} --disable-shared --with-pic --with-bignum=no --enable-module-recovery"
+ac_configure_args="${ac_configure_args} --disable-shared --with-pic --with-bignum=no --enable-module-recovery --disable-jni"
 AC_CONFIG_SUBDIRS([src/secp256k1])
 
 AC_OUTPUT
@@ -1297,6 +1298,7 @@ echo "  with zmq      = $use_zmq"
 echo "  with test     = $use_tests"
 echo "  with bench    = $use_bench"
 echo "  with upnp     = $use_upnp"
+echo "  use asm       = $use_asm"
 echo "  debug enabled = $enable_debug"
 echo "  werror        = $enable_werror"
 echo 
diff --git a/contrib/README.md b/contrib/README.md
index 6f750106e..a582a724f 100644
--- a/contrib/README.md
+++ b/contrib/README.md
@@ -26,7 +26,7 @@ Contains files used to package bitcoind/bitcoin-qt
 for Debian-based Linux systems. If you compile bitcoind/bitcoin-qt yourself, there are some useful files here.
 
 ### [Gitian-descriptors](/contrib/gitian-descriptors) ###
-Notes on getting Gitian builds up and running using KVM.
+Files used during the gitian build process. For more information about gitian, see the [the Bitcoin Core documentation repository](https://github.com/bitcoin-core/docs).
 
 ### [Gitian-keys](/contrib/gitian-keys)
 PGP keys used for signing Bitcoin Core [Gitian release](/doc/release-process.md) results.
@@ -35,7 +35,7 @@ PGP keys used for signing Bitcoin Core [Gitian release](/doc/release-process.md)
 Scripts and notes for Mac builds. 
 
 ### [RPM](/contrib/rpm) ###
-RPM spec file for building bitcoin-core on RPM based distributions
+RPM spec file for building bitcoin-core on RPM based distributions.
 
 ### [Gitian-build](/contrib/gitian-build.sh) ###
 Script for running full Gitian builds.
diff --git a/contrib/bitcoind.bash-completion b/contrib/bitcoind.bash-completion
index af87e97d8..cccd4bde0 100644
--- a/contrib/bitcoind.bash-completion
+++ b/contrib/bitcoind.bash-completion
@@ -30,7 +30,7 @@ _bitcoind() {
             ;;
         *)
 
-            # only parse -help if senseful
+            # only parse -help if sensible
             if [[ -z "$cur" || "$cur" =~ ^- ]]; then
                 local helpopts
                 helpopts=$($bitcoind -help 2>&1 | awk '$1 ~ /^-/ { sub(/=.*/, "="); print $1 }' )
diff --git a/contrib/debian/examples/bitcoin.conf b/contrib/debian/examples/bitcoin.conf
index 1029a5107..14a59fdf6 100644
--- a/contrib/debian/examples/bitcoin.conf
+++ b/contrib/debian/examples/bitcoin.conf
@@ -76,7 +76,7 @@
 #rpcuser=Ulysseys
 #rpcpassword=YourSuperGreatPasswordNumber_DO_NOT_USE_THIS_OR_YOU_WILL_GET_ROBBED_385593
 #
-# The second method `rpcauth` can be added to server startup argument. It is set at intialization time
+# The second method `rpcauth` can be added to server startup argument. It is set at initialization time
 # using the output from the script in share/rpcuser/rpcuser.py after providing a username:
 #
 # ./share/rpcuser/rpcuser.py alice
diff --git a/contrib/devtools/check-doc.py b/contrib/devtools/check-doc.py
index 3b7a8f9a6..10c3bab03 100755
--- a/contrib/devtools/check-doc.py
+++ b/contrib/devtools/check-doc.py
@@ -12,6 +12,7 @@
 
 from subprocess import check_output
 import re
+import sys
 
 FOLDER_GREP = 'src'
 FOLDER_TEST = 'src/test/'
@@ -21,7 +22,7 @@
 REGEX_ARG = re.compile(r'(?:map(?:Multi)?Args(?:\.count\(|\[)|Get(?:Bool)?Arg\()\"(\-[^\"]+?)\"')
 REGEX_DOC = re.compile(r'HelpMessageOpt\(\"(\-[^\"=]+?)(?:=|\")')
 # list unsupported, deprecated and duplicate args as they need no documentation
-SET_DOC_OPTIONAL = set(['-rpcssl', '-benchmark', '-h', '-help', '-socks', '-tor', '-debugnet', '-whitelistalwaysrelay', '-prematurewitness', '-walletprematurewitness', '-promiscuousmempoolflags', '-blockminsize', '-dbcrashratio', '-forcecompactdb'])
+SET_DOC_OPTIONAL = set(['-rpcssl', '-benchmark', '-h', '-help', '-socks', '-tor', '-debugnet', '-whitelistalwaysrelay', '-prematurewitness', '-walletprematurewitness', '-promiscuousmempoolflags', '-blockminsize', '-dbcrashratio', '-forcecompactdb', '-usehd'])
 
 def main():
   used = check_output(CMD_GREP_ARGS, shell=True)
@@ -39,7 +40,7 @@ def main():
   print "Args unknown     : %s" % len(args_unknown)
   print args_unknown
 
-  exit(len(args_need_doc))
+  sys.exit(len(args_need_doc))
 
 if __name__ == "__main__":
     main()
diff --git a/contrib/devtools/check-rpc-mappings.py b/contrib/devtools/check-rpc-mappings.py
new file mode 100755
index 000000000..7e96852c5
--- /dev/null
+++ b/contrib/devtools/check-rpc-mappings.py
@@ -0,0 +1,158 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Check RPC argument consistency."""
+
+from collections import defaultdict
+import os
+import re
+import sys
+
+# Source files (relative to root) to scan for dispatch tables
+SOURCES = [
+    "src/rpc/server.cpp",
+    "src/rpc/blockchain.cpp",
+    "src/rpc/mining.cpp",
+    "src/rpc/misc.cpp",
+    "src/rpc/net.cpp",
+    "src/rpc/rawtransaction.cpp",
+    "src/wallet/rpcwallet.cpp",
+]
+# Source file (relative to root) containing conversion mapping
+SOURCE_CLIENT = 'src/rpc/client.cpp'
+# Argument names that should be ignored in consistency checks
+IGNORE_DUMMY_ARGS = {'dummy', 'arg0', 'arg1', 'arg2', 'arg3', 'arg4', 'arg5', 'arg6', 'arg7', 'arg8', 'arg9'}
+
+class RPCCommand:
+    def __init__(self, name, args):
+        self.name = name
+        self.args = args
+
+class RPCArgument:
+    def __init__(self, names, idx):
+        self.names = names
+        self.idx = idx
+        self.convert = False
+
+def parse_string(s):
+    assert s[0] == '"'
+    assert s[-1] == '"'
+    return s[1:-1]
+
+def process_commands(fname):
+    """Find and parse dispatch table in implementation file `fname`."""
+    cmds = []
+    in_rpcs = False
+    with open(fname, "r") as f:
+        for line in f:
+            line = line.rstrip()
+            if not in_rpcs:
+                if re.match("static const CRPCCommand .*\[\] =", line):
+                    in_rpcs = True
+            else:
+                if line.startswith('};'):
+                    in_rpcs = False
+                elif '{' in line and '"' in line:
+                    m = re.search('{ *("[^"]*"), *("[^"]*"), *&([^,]*), *{([^}]*)} *},', line)
+                    assert m, 'No match to table expression: %s' % line
+                    name = parse_string(m.group(2))
+                    args_str = m.group(4).strip()
+                    if args_str:
+                        args = [RPCArgument(parse_string(x.strip()).split('|'), idx) for idx, x in enumerate(args_str.split(','))]
+                    else:
+                        args = []
+                    cmds.append(RPCCommand(name, args))
+    assert not in_rpcs and cmds, "Something went wrong with parsing the C++ file: update the regexps"
+    return cmds
+
+def process_mapping(fname):
+    """Find and parse conversion table in implementation file `fname`."""
+    cmds = []
+    in_rpcs = False
+    with open(fname, "r") as f:
+        for line in f:
+            line = line.rstrip()
+            if not in_rpcs:
+                if line == 'static const CRPCConvertParam vRPCConvertParams[] =':
+                    in_rpcs = True
+            else:
+                if line.startswith('};'):
+                    in_rpcs = False
+                elif '{' in line and '"' in line:
+                    m = re.search('{ *("[^"]*"), *([0-9]+) *, *("[^"]*") *},', line)
+                    assert m, 'No match to table expression: %s' % line
+                    name = parse_string(m.group(1))
+                    idx = int(m.group(2))
+                    argname = parse_string(m.group(3))
+                    cmds.append((name, idx, argname))
+    assert not in_rpcs and cmds
+    return cmds
+
+def main():
+    root = sys.argv[1]
+
+    # Get all commands from dispatch tables
+    cmds = []
+    for fname in SOURCES:
+        cmds += process_commands(os.path.join(root, fname))
+
+    cmds_by_name = {}
+    for cmd in cmds:
+        cmds_by_name[cmd.name] = cmd
+
+    # Get current convert mapping for client
+    client = SOURCE_CLIENT
+    mapping = set(process_mapping(os.path.join(root, client)))
+
+    print('* Checking consistency between dispatch tables and vRPCConvertParams')
+
+    # Check mapping consistency
+    errors = 0
+    for (cmdname, argidx, argname) in mapping:
+        try:
+            rargnames = cmds_by_name[cmdname].args[argidx].names
+        except IndexError:
+            print('ERROR: %s argument %i (named %s in vRPCConvertParams) is not defined in dispatch table' % (cmdname, argidx, argname))
+            errors += 1
+            continue
+        if argname not in rargnames:
+            print('ERROR: %s argument %i is named %s in vRPCConvertParams but %s in dispatch table' % (cmdname, argidx, argname, rargnames), file=sys.stderr)
+            errors += 1
+
+    # Check for conflicts in vRPCConvertParams conversion
+    # All aliases for an argument must either be present in the
+    # conversion table, or not. Anything in between means an oversight
+    # and some aliases won't work.
+    for cmd in cmds:
+        for arg in cmd.args:
+            convert = [((cmd.name, arg.idx, argname) in mapping) for argname in arg.names]
+            if any(convert) != all(convert):
+                print('ERROR: %s argument %s has conflicts in vRPCConvertParams conversion specifier %s' % (cmd.name, arg.names, convert))
+                errors += 1
+            arg.convert = all(convert)
+
+    # Check for conversion difference by argument name.
+    # It is preferable for API consistency that arguments with the same name
+    # have the same conversion, so bin by argument name.
+    all_methods_by_argname = defaultdict(list)
+    converts_by_argname = defaultdict(list)
+    for cmd in cmds:
+        for arg in cmd.args:
+            for argname in arg.names:
+                all_methods_by_argname[argname].append(cmd.name)
+                converts_by_argname[argname].append(arg.convert)
+
+    for argname, convert in converts_by_argname.items():
+        if all(convert) != any(convert):
+            if argname in IGNORE_DUMMY_ARGS:
+                # these are testing or dummy, don't warn for them
+                continue
+            print('WARNING: conversion mismatch for argument named %s (%s)' %
+                  (argname, list(zip(all_methods_by_argname[argname], converts_by_argname[argname]))))
+
+    sys.exit(errors > 0)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/contrib/devtools/github-merge.py b/contrib/devtools/github-merge.py
index c664cf81f..2941d2cb6 100755
--- a/contrib/devtools/github-merge.py
+++ b/contrib/devtools/github-merge.py
@@ -20,6 +20,7 @@
 import argparse
 import hashlib
 import subprocess
+import sys
 import json,codecs
 try:
     from urllib.request import Request,urlopen
@@ -158,11 +159,11 @@ def main():
     if repo is None:
         print("ERROR: No repository configured. Use this command to set:", file=stderr)
         print("git config githubmerge.repository <owner>/<repo>", file=stderr)
-        exit(1)
+        sys.exit(1)
     if signingkey is None:
         print("ERROR: No GPG signing key set. Set one using:",file=stderr)
         print("git config --global user.signingkey <key>",file=stderr)
-        exit(1)
+        sys.exit(1)
 
     host_repo = host+":"+repo # shortcut for push/pull target
 
@@ -173,7 +174,7 @@ def main():
     # Receive pull information from github
     info = retrieve_pr_info(repo,pull)
     if info is None:
-        exit(1)
+        sys.exit(1)
     title = info['title'].strip()
     body = info['body'].strip()
     # precedence order for destination branch argument:
@@ -194,27 +195,23 @@ def main():
         subprocess.check_call([GIT,'checkout','-q',branch])
     except subprocess.CalledProcessError as e:
         print("ERROR: Cannot check out branch %s." % (branch), file=stderr)
-        exit(3)
+        sys.exit(3)
     try:
-        subprocess.check_call([GIT,'fetch','-q',host_repo,'+refs/pull/'+pull+'/*:refs/heads/pull/'+pull+'/*'])
+        subprocess.check_call([GIT,'fetch','-q',host_repo,'+refs/pull/'+pull+'/*:refs/heads/pull/'+pull+'/*',
+                                                          '+refs/heads/'+branch+':refs/heads/'+base_branch])
     except subprocess.CalledProcessError as e:
-        print("ERROR: Cannot find pull request #%s on %s." % (pull,host_repo), file=stderr)
-        exit(3)
+        print("ERROR: Cannot find pull request #%s or branch %s on %s." % (pull,branch,host_repo), file=stderr)
+        sys.exit(3)
     try:
         subprocess.check_call([GIT,'log','-q','-1','refs/heads/'+head_branch], stdout=devnull, stderr=stdout)
     except subprocess.CalledProcessError as e:
         print("ERROR: Cannot find head of pull request #%s on %s." % (pull,host_repo), file=stderr)
-        exit(3)
+        sys.exit(3)
     try:
         subprocess.check_call([GIT,'log','-q','-1','refs/heads/'+merge_branch], stdout=devnull, stderr=stdout)
     except subprocess.CalledProcessError as e:
         print("ERROR: Cannot find merge of pull request #%s on %s." % (pull,host_repo), file=stderr)
-        exit(3)
-    try:
-        subprocess.check_call([GIT,'fetch','-q',host_repo,'+refs/heads/'+branch+':refs/heads/'+base_branch])
-    except subprocess.CalledProcessError as e:
-        print("ERROR: Cannot find branch %s on %s." % (branch,host_repo), file=stderr)
-        exit(3)
+        sys.exit(3)
     subprocess.check_call([GIT,'checkout','-q',base_branch])
     subprocess.call([GIT,'branch','-q','-D',local_merge_branch], stderr=devnull)
     subprocess.check_call([GIT,'checkout','-q','-b',local_merge_branch])
@@ -236,30 +233,30 @@ def main():
         except subprocess.CalledProcessError as e:
             print("ERROR: Cannot be merged cleanly.",file=stderr)
             subprocess.check_call([GIT,'merge','--abort'])
-            exit(4)
+            sys.exit(4)
         logmsg = subprocess.check_output([GIT,'log','--pretty=format:%s','-n','1']).decode('utf-8')
         if logmsg.rstrip() != firstline.rstrip():
             print("ERROR: Creating merge failed (already merged?).",file=stderr)
-            exit(4)
+            sys.exit(4)
 
         symlink_files = get_symlink_files()
         for f in symlink_files:
             print("ERROR: File %s was a symlink" % f)
         if len(symlink_files) > 0:
-            exit(4)
+            sys.exit(4)
 
         # Put tree SHA512 into the message
         try:
             first_sha512 = tree_sha512sum()
             message += '\n\nTree-SHA512: ' + first_sha512
         except subprocess.CalledProcessError as e:
-            printf("ERROR: Unable to compute tree hash")
-            exit(4)
+            print("ERROR: Unable to compute tree hash")
+            sys.exit(4)
         try:
             subprocess.check_call([GIT,'commit','--amend','-m',message.encode('utf-8')])
         except subprocess.CalledProcessError as e:
-            printf("ERROR: Cannot update message.",file=stderr)
-            exit(4)
+            print("ERROR: Cannot update message.", file=stderr)
+            sys.exit(4)
 
         print_merge_details(pull, title, branch, base_branch, head_branch)
         print()
@@ -268,7 +265,7 @@ def main():
         if testcmd:
             if subprocess.call(testcmd,shell=True):
                 print("ERROR: Running %s failed." % testcmd,file=stderr)
-                exit(5)
+                sys.exit(5)
 
             # Show the created merge.
             diff = subprocess.check_output([GIT,'diff',merge_branch+'..'+local_merge_branch])
@@ -279,7 +276,7 @@ def main():
                 if reply.lower() == 'ignore':
                     print("Difference with github ignored.",file=stderr)
                 else:
-                    exit(6)
+                    sys.exit(6)
         else:
             # Verify the result manually.
             print("Dropping you on a shell so you can try building/testing the merged source.",file=stderr)
@@ -292,7 +289,7 @@ def main():
         second_sha512 = tree_sha512sum()
         if first_sha512 != second_sha512:
             print("ERROR: Tree hash changed unexpectedly",file=stderr)
-            exit(8)
+            sys.exit(8)
 
         # Sign the merge commit.
         print_merge_details(pull, title, branch, base_branch, head_branch)
@@ -306,7 +303,7 @@ def main():
                     print("Error while signing, asking again.",file=stderr)
             elif reply == 'x':
                 print("Not signing off on merge, exiting.",file=stderr)
-                exit(1)
+                sys.exit(1)
 
         # Put the result in branch.
         subprocess.check_call([GIT,'checkout','-q',branch])
@@ -326,7 +323,7 @@ def main():
             subprocess.check_call([GIT,'push',host_repo,'refs/heads/'+branch])
             break
         elif reply == 'x':
-            exit(1)
+            sys.exit(1)
 
 if __name__ == '__main__':
     main()
diff --git a/contrib/devtools/lint-all.sh b/contrib/devtools/lint-all.sh
new file mode 100755
index 000000000..b6d86959c
--- /dev/null
+++ b/contrib/devtools/lint-all.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+#
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+# This script runs all contrib/devtools/lint-*.sh files, and fails if any exit
+# with a non-zero status code.
+
+set -u
+
+SCRIPTDIR=$(dirname "${BASH_SOURCE[0]}")
+LINTALL=$(basename "${BASH_SOURCE[0]}")
+
+for f in "${SCRIPTDIR}"/lint-*.sh; do
+  if [ "$(basename "$f")" != "$LINTALL" ]; then
+    if ! "$f"; then
+      echo "^---- failure generated from $f"
+      exit 1
+    fi
+  fi
+done
diff --git a/contrib/devtools/lint-whitespace.sh b/contrib/devtools/lint-whitespace.sh
new file mode 100755
index 000000000..989923f31
--- /dev/null
+++ b/contrib/devtools/lint-whitespace.sh
@@ -0,0 +1,88 @@
+#!/bin/bash
+#
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+# Check for new lines in diff that introduce trailing whitespace.
+
+# We can't run this check unless we know the commit range for the PR.
+if [ -z "${TRAVIS_COMMIT_RANGE}" ]; then
+  echo "Cannot run lint-whitespace.sh without commit range. To run locally, use:"
+  echo "TRAVIS_COMMIT_RANGE='<commit range>' .lint-whitespace.sh"
+  echo "For example:"
+  echo "TRAVIS_COMMIT_RANGE='47ba2c3...ee50c9e' .lint-whitespace.sh"
+  exit 1
+fi
+
+showdiff() {
+  if ! git diff -U0 "${TRAVIS_COMMIT_RANGE}" -- "." ":(exclude)src/leveldb/" ":(exclude)src/secp256k1/" ":(exclude)src/univalue/" ":(exclude)doc/release-notes/"; then
+    echo "Failed to get a diff"
+    exit 1
+  fi
+}
+
+showcodediff() {
+  if ! git diff -U0 "${TRAVIS_COMMIT_RANGE}" -- *.cpp *.h *.md *.py *.sh ":(exclude)src/leveldb/" ":(exclude)src/secp256k1/" ":(exclude)src/univalue/" ":(exclude)doc/release-notes/"; then
+    echo "Failed to get a diff"
+    exit 1
+  fi
+}
+
+RET=0
+
+# Check if trailing whitespace was found in the diff.
+if showdiff | grep -E -q '^\+.*\s+$'; then
+  echo "This diff appears to have added new lines with trailing whitespace."
+  echo "The following changes were suspected:"
+  FILENAME=""
+  SEEN=0
+  while read -r line; do
+    if [[ "$line" =~ ^diff ]]; then
+      FILENAME="$line"
+      SEEN=0
+    elif [[ "$line" =~ ^@@ ]]; then
+      LINENUMBER="$line"
+    else
+      if [ "$SEEN" -eq 0 ]; then
+        # The first time a file is seen with trailing whitespace, we print the
+        # filename (preceded by a newline).
+        echo
+        echo "$FILENAME"
+        echo "$LINENUMBER"
+        SEEN=1
+      fi
+      echo "$line"
+    fi
+  done < <(showdiff | grep -E '^(diff --git |@@|\+.*\s+$)')
+  RET=1
+fi
+
+# Check if tab characters were found in the diff.
+if showcodediff | grep -P -q '^\+.*\t'; then
+  echo "This diff appears to have added new lines with tab characters instead of spaces."
+  echo "The following changes were suspected:"
+  FILENAME=""
+  SEEN=0
+  while read -r line; do
+    if [[ "$line" =~ ^diff ]]; then
+      FILENAME="$line"
+      SEEN=0
+    elif [[ "$line" =~ ^@@ ]]; then
+      LINENUMBER="$line"
+    else
+      if [ "$SEEN" -eq 0 ]; then
+        # The first time a file is seen with a tab character, we print the
+        # filename (preceded by a newline).
+        echo
+        echo "$FILENAME"
+        echo "$LINENUMBER"
+        SEEN=1
+      fi
+      echo "$line"
+    fi
+  done < <(showcodediff | grep -P '^(diff --git |@@|\+.*\t)')
+  RET=1
+fi
+
+exit $RET
diff --git a/contrib/devtools/security-check.py b/contrib/devtools/security-check.py
index c90541e27..6eb566745 100755
--- a/contrib/devtools/security-check.py
+++ b/contrib/devtools/security-check.py
@@ -212,5 +212,5 @@ def identify_executable(executable):
         except IOError:
             print('%s: cannot open' % filename)
             retval = 1
-    exit(retval)
+    sys.exit(retval)
 
diff --git a/contrib/devtools/symbol-check.py b/contrib/devtools/symbol-check.py
index 8f8685006..98daa1bd7 100755
--- a/contrib/devtools/symbol-check.py
+++ b/contrib/devtools/symbol-check.py
@@ -159,6 +159,6 @@ def read_libraries(filename):
                 print('%s: NEEDED library %s is not allowed' % (filename, library_name.decode('utf-8')))
                 retval = 1
 
-    exit(retval)
+    sys.exit(retval)
 
 
diff --git a/contrib/devtools/update-translations.py b/contrib/devtools/update-translations.py
index 201184100..e1924749d 100755
--- a/contrib/devtools/update-translations.py
+++ b/contrib/devtools/update-translations.py
@@ -36,12 +36,12 @@ def check_at_repository_root():
     if not os.path.exists('.git'):
         print('No .git directory found')
         print('Execute this script at the root of the repository', file=sys.stderr)
-        exit(1)
+        sys.exit(1)
 
 def fetch_all_translations():
     if subprocess.call([TX, 'pull', '-f', '-a']):
         print('Error while fetching translations', file=sys.stderr)
-        exit(1)
+        sys.exit(1)
 
 def find_format_specifiers(s):
     '''Find all format specifiers in a string.'''
diff --git a/contrib/gitian-build.sh b/contrib/gitian-build.sh
index 6ee5df470..8fdec21b0 100755
--- a/contrib/gitian-build.sh
+++ b/contrib/gitian-build.sh
@@ -40,15 +40,15 @@ version		Version number, commit, or branch to build. If building a commit or bra
 Options:
 -c|--commit	Indicate that the version argument is for a commit or branch
 -u|--url	Specify the URL of the repository. Default is https://github.com/bitcoin/bitcoin
--v|--verify 	Verify the gitian build
--b|--build	Do a gitian build
+-v|--verify 	Verify the Gitian build
+-b|--build	Do a Gitian build
 -s|--sign	Make signed binaries for Windows and Mac OSX
 -B|--buildsign	Build both signed and unsigned binaries
 -o|--os		Specify which Operating Systems the build is for. Default is lwx. l for linux, w for windows, x for osx
 -j		Number of processes to use. Default 2
 -m		Memory to allocate in MiB. Default 2000
 --kvm           Use KVM instead of LXC
---setup         Setup the gitian building environment. Uses KVM. If you want to use lxc, use the --lxc option. Only works on Debian-based systems (Ubuntu, Debian)
+--setup         Set up the Gitian building environment. Uses KVM. If you want to use lxc, use the --lxc option. Only works on Debian-based systems (Ubuntu, Debian)
 --detach-sign   Create the assert file for detached signing. Will not commit anything.
 --no-commit     Do not commit anything to git
 -h|--help	Print this help message
@@ -179,8 +179,6 @@ done
 if [[ $lxc = true ]]
 then
     export USE_LXC=1
-    export LXC_BRIDGE=lxcbr0
-    sudo ifconfig lxcbr0 up 10.0.2.2
 fi
 
 # Check for OSX SDK
diff --git a/contrib/gitian-descriptors/README.md b/contrib/gitian-descriptors/README.md
deleted file mode 100644
index 614970659..000000000
--- a/contrib/gitian-descriptors/README.md
+++ /dev/null
@@ -1,65 +0,0 @@
-### Gavin's notes on getting gitian builds up and running using KVM
-
-These instructions distilled from
-[https://help.ubuntu.com/community/KVM/Installation](https://help.ubuntu.com/community/KVM/Installation).
-
-You need the right hardware: you need a 64-bit-capable CPU with hardware virtualization support (Intel VT-x or AMD-V). Not all modern CPUs support hardware virtualization.
-
-You probably need to enable hardware virtualization in your machine's BIOS.
-
-You need to be running a recent version of 64-bit-Ubuntu, and you need to install several prerequisites:
-
-	sudo apt-get install ruby apache2 git apt-cacher-ng python-vm-builder qemu-kvm
-
-Sanity checks:
-
-	sudo service apt-cacher-ng status  # Should return apt-cacher-ng is running
-	ls -l /dev/kvm   # Should show a /dev/kvm device
-
-
-Once you've got the right hardware and software:
-
-    git clone git://github.com/bitcoin/bitcoin.git
-    git clone git://github.com/devrandom/gitian-builder.git
-    mkdir gitian-builder/inputs
-    cd gitian-builder/inputs
-
-    # Create base images
-    cd gitian-builder
-    bin/make-base-vm --suite trusty --arch amd64
-    cd ..
-
-    # Get inputs (see doc/release-process.md for exact inputs needed and where to get them)
-    ...
-
-    # For further build instructions see doc/release-process.md
-    ...
-
----------------------
-
-`gitian-builder` now also supports building using LXC. See
-[help.ubuntu.com](https://help.ubuntu.com/14.04/serverguide/lxc.html)
-for how to get LXC up and running under Ubuntu.
-
-If your main machine is a 64-bit Mac or PC with a few gigabytes of memory
-and at least 10 gigabytes of free disk space, you can `gitian-build` using
-LXC running inside a virtual machine.
-
-Here's a description of Gavin's setup on OSX 10.6:
-
-1. Download and install VirtualBox from [https://www.virtualbox.org/](https://www.virtualbox.org/)
-
-2. Download the 64-bit Ubuntu Desktop 12.04 LTS .iso CD image from
-   [http://www.ubuntu.com/](http://www.ubuntu.com/)
-
-3. Run VirtualBox and create a new virtual machine, using the Ubuntu .iso (see the [VirtualBox documentation](https://www.virtualbox.org/wiki/Documentation) for details). Create it with at least 2 gigabytes of memory and a disk that is at least 20 gigabytes big.
-
-4. Inside the running Ubuntu desktop, install:
-
-	sudo apt-get install debootstrap lxc ruby apache2 git apt-cacher-ng python-vm-builder
-
-5. Still inside Ubuntu, tell gitian-builder to use LXC, then follow the "Once you've got the right hardware and software" instructions above:
-
-	export USE_LXC=1
-	git clone git://github.com/bitcoin/bitcoin.git
-	... etc
diff --git a/contrib/gitian-descriptors/gitian-linux.yml b/contrib/gitian-descriptors/gitian-linux.yml
index 3da8510cf..c80e19edb 100644
--- a/contrib/gitian-descriptors/gitian-linux.yml
+++ b/contrib/gitian-descriptors/gitian-linux.yml
@@ -1,5 +1,5 @@
 ---
-name: "bitcoin-linux-0.15"
+name: "bitcoin-linux-0.16"
 enable_cache: true
 suites:
 - "trusty"
@@ -132,7 +132,6 @@ script: |
   export PATH=${WRAP_DIR}:${PATH}
 
   # Create the release tarball using (arbitrarily) the first host
-  export GIT_DIR="$PWD/.git"
   ./autogen.sh
   CONFIG_SITE=${BASEPREFIX}/`echo "${HOSTS}" | awk '{print $1;}'`/share/config.site ./configure --prefix=/
   make dist
@@ -145,6 +144,9 @@ script: |
   find bitcoin-* | sort | tar --no-recursion --mode='u+rw,go+r-w,a+X' --owner=0 --group=0 -c -T - | gzip -9n > ../$SOURCEDIST
   popd
 
+  # Workaround for tarball not building with the bare tag version (prep)
+  make -C src obj/build.h
+
   ORIGPATH="$PATH"
   # Extract the release tarball into a dir for each host and build
   for i in ${HOSTS}; do
@@ -155,6 +157,11 @@ script: |
     mkdir -p ${INSTALLPATH}
     tar --strip-components=1 -xf ../$SOURCEDIST
 
+    # Workaround for tarball not building with the bare tag version
+    echo '#!/bin/true' >share/genbuild.sh
+    mkdir src/obj
+    cp ../src/obj/build.h src/obj/
+
     CONFIG_SITE=${BASEPREFIX}/${i}/share/config.site ./configure --prefix=/ --disable-ccache --disable-maintainer-mode --disable-dependency-tracking ${CONFIGFLAGS} CFLAGS="${HOST_CFLAGS}" CXXFLAGS="${HOST_CXXFLAGS}" LDFLAGS="${HOST_LDFLAGS}"
     make ${MAKEOPTS}
     make ${MAKEOPTS} -C src check-security
diff --git a/contrib/gitian-descriptors/gitian-osx.yml b/contrib/gitian-descriptors/gitian-osx.yml
index 206db7c19..cbf286d2c 100644
--- a/contrib/gitian-descriptors/gitian-osx.yml
+++ b/contrib/gitian-descriptors/gitian-osx.yml
@@ -1,5 +1,5 @@
 ---
-name: "bitcoin-osx-0.15"
+name: "bitcoin-osx-0.16"
 enable_cache: true
 suites:
 - "trusty"
@@ -101,7 +101,6 @@ script: |
   export PATH=${WRAP_DIR}:${PATH}
 
   # Create the release tarball using (arbitrarily) the first host
-  export GIT_DIR="$PWD/.git"
   ./autogen.sh
   CONFIG_SITE=${BASEPREFIX}/`echo "${HOSTS}" | awk '{print $1;}'`/share/config.site ./configure --prefix=/
   make dist
@@ -115,6 +114,9 @@ script: |
   find bitcoin-* | sort | tar --no-recursion --mode='u+rw,go+r-w,a+X' --owner=0 --group=0 -c -T - | gzip -9n > ../$SOURCEDIST
   popd
 
+  # Workaround for tarball not building with the bare tag version (prep)
+  make -C src obj/build.h
+
   ORIGPATH="$PATH"
   # Extract the release tarball into a dir for each host and build
   for i in ${HOSTS}; do
@@ -125,6 +127,11 @@ script: |
     mkdir -p ${INSTALLPATH}
     tar --strip-components=1 -xf ../$SOURCEDIST
 
+    # Workaround for tarball not building with the bare tag version
+    echo '#!/bin/true' >share/genbuild.sh
+    mkdir src/obj
+    cp ../src/obj/build.h src/obj/
+
     CONFIG_SITE=${BASEPREFIX}/${i}/share/config.site ./configure --prefix=/ --disable-ccache --disable-maintainer-mode --disable-dependency-tracking ${CONFIGFLAGS}
     make ${MAKEOPTS}
     make install-strip DESTDIR=${INSTALLPATH}
diff --git a/contrib/gitian-descriptors/gitian-win.yml b/contrib/gitian-descriptors/gitian-win.yml
index 1d4d70494..95ff9759c 100644
--- a/contrib/gitian-descriptors/gitian-win.yml
+++ b/contrib/gitian-descriptors/gitian-win.yml
@@ -1,5 +1,5 @@
 ---
-name: "bitcoin-win-0.15"
+name: "bitcoin-win-0.16"
 enable_cache: true
 suites:
 - "trusty"
@@ -116,7 +116,6 @@ script: |
   export PATH=${WRAP_DIR}:${PATH}
 
   # Create the release tarball using (arbitrarily) the first host
-  export GIT_DIR="$PWD/.git"
   ./autogen.sh
   CONFIG_SITE=${BASEPREFIX}/`echo "${HOSTS}" | awk '{print $1;}'`/share/config.site ./configure --prefix=/
   make dist
@@ -132,6 +131,9 @@ script: |
   cp ../$SOURCEDIST $OUTDIR/src
   popd
 
+  # Workaround for tarball not building with the bare tag version (prep)
+  make -C src obj/build.h
+
   ORIGPATH="$PATH"
   # Extract the release tarball into a dir for each host and build
   for i in ${HOSTS}; do
@@ -142,6 +144,11 @@ script: |
     mkdir -p ${INSTALLPATH}
     tar --strip-components=1 -xf ../$SOURCEDIST
 
+    # Workaround for tarball not building with the bare tag version
+    echo '#!/bin/true' >share/genbuild.sh
+    mkdir src/obj
+    cp ../src/obj/build.h src/obj/
+
     CONFIG_SITE=${BASEPREFIX}/${i}/share/config.site ./configure --prefix=/ --disable-ccache --disable-maintainer-mode --disable-dependency-tracking ${CONFIGFLAGS} CFLAGS="${HOST_CFLAGS}" CXXFLAGS="${HOST_CXXFLAGS}"
     make ${MAKEOPTS}
     make ${MAKEOPTS} -C src check-security
diff --git a/contrib/gitian-keys/README.md b/contrib/gitian-keys/README.md
index 439910330..4b0b7a261 100644
--- a/contrib/gitian-keys/README.md
+++ b/contrib/gitian-keys/README.md
@@ -3,7 +3,7 @@ PGP keys
 
 This folder contains the public keys of developers and active contributors.
 
-The keys are mainly used to sign git commits or the build results of gitian
+The keys are mainly used to sign git commits or the build results of Gitian
 builds.
 
 You can import the keys into gpg as follows. Also, make sure to fetch the
diff --git a/contrib/gitian-keys/meshcollider-key.pgp b/contrib/gitian-keys/meshcollider-key.pgp
new file mode 100644
index 000000000..20963e7e2
--- /dev/null
+++ b/contrib/gitian-keys/meshcollider-key.pgp
@@ -0,0 +1,51 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+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+=as33
+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/contrib/init/bitcoind.conf b/contrib/init/bitcoind.conf
index f9554eecd..de4ea0ed5 100644
--- a/contrib/init/bitcoind.conf
+++ b/contrib/init/bitcoind.conf
@@ -30,12 +30,12 @@ pre-start script
         echo
         echo "This password is security critical to securing wallets "
         echo "and must not be the same as the rpcuser setting."
-        echo "You can generate a suitable random password using the following"
+        echo "You can generate a suitable random password using the following "
         echo "command from the shell:"
         echo
         echo "bash -c 'tr -dc a-zA-Z0-9 < /dev/urandom | head -c32 && echo'"
         echo
-        echo "It is also recommended that you also set alertnotify so you are "
+        echo "It is recommended that you also set alertnotify so you are "
         echo "notified of problems:"
         echo
         echo "ie: alertnotify=echo %%s | mail -s \"Bitcoin Alert\"" \
diff --git a/contrib/init/bitcoind.openrc b/contrib/init/bitcoind.openrc
index eda1a96fb..50377c099 100644
--- a/contrib/init/bitcoind.openrc
+++ b/contrib/init/bitcoind.openrc
@@ -76,12 +76,12 @@ checkconfig()
 		eerror ""
 		eerror "This password is security critical to securing wallets "
 		eerror "and must not be the same as the rpcuser setting."
-		eerror "You can generate a suitable random password using the following"
+		eerror "You can generate a suitable random password using the following "
 		eerror "command from the shell:"
 		eerror ""
 		eerror "bash -c 'tr -dc a-zA-Z0-9 < /dev/urandom | head -c32 && echo'"
 		eerror ""
-		eerror "It is also recommended that you also set alertnotify so you are "
+		eerror "It is recommended that you also set alertnotify so you are "
 		eerror "notified of problems:"
 		eerror ""
 		eerror "ie: alertnotify=echo %%s | mail -s \"Bitcoin Alert\"" \
diff --git a/contrib/init/org.bitcoin.bitcoind.plist b/contrib/init/org.bitcoin.bitcoind.plist
index e94cd4466..95b5342f1 100644
--- a/contrib/init/org.bitcoin.bitcoind.plist
+++ b/contrib/init/org.bitcoin.bitcoind.plist
@@ -7,7 +7,6 @@
 	<key>ProgramArguments</key>
 	<array>
 		<string>/usr/local/bin/bitcoind</string>
-		<string>-daemon</string>
 	</array>
 	<key>RunAtLoad</key>
 	<true/>
diff --git a/contrib/linearize/README.md b/contrib/linearize/README.md
index f2a2ab276..298510698 100644
--- a/contrib/linearize/README.md
+++ b/contrib/linearize/README.md
@@ -46,7 +46,7 @@ linearize-hashes.py.
 (Default: `1000*1000*1000 bytes`)
 * `netmagic`: Network magic number.
 * `out_of_order_cache_sz`: If out-of-order blocks are being read, the block can
-be written to a cache so that the blockchain doesn't have to be seeked again.
+be written to a cache so that the blockchain doesn't have to be sought again.
 This option specifies the cache size. (Default: `100*1000*1000 bytes`)
 * `rev_hash_bytes`: If true, the block hash list written by linearize-hashes.py
 will be byte-reversed when read by linearize-data.py. See the linearize-hashes
diff --git a/contrib/linearize/example-linearize.cfg b/contrib/linearize/example-linearize.cfg
index d019b06b6..2315898bf 100644
--- a/contrib/linearize/example-linearize.cfg
+++ b/contrib/linearize/example-linearize.cfg
@@ -3,9 +3,16 @@ rpcuser=someuser
 rpcpassword=somepassword
 #datadir=~/.bitcoin
 host=127.0.0.1
+
+#mainnet default
 port=8332
+
+#testnet default
 #port=18332
 
+#regtest default
+#port=18443
+
 # bootstrap.dat hashlist settings (linearize-hashes)
 max_height=313000
 
diff --git a/contrib/linearize/linearize-hashes.py b/contrib/linearize/linearize-hashes.py
index db8eb7021..58fec6ddd 100755
--- a/contrib/linearize/linearize-hashes.py
+++ b/contrib/linearize/linearize-hashes.py
@@ -87,7 +87,7 @@ def get_block_hashes(settings, max_blocks_per_call=10000):
 		for x,resp_obj in enumerate(reply):
 			if rpc.response_is_error(resp_obj):
 				print('JSON-RPC: error at height', height+x, ': ', resp_obj['error'], file=sys.stderr)
-				exit(1)
+				sys.exit(1)
 			assert(resp_obj['id'] == x) # assume replies are in-sequence
 			if settings['rev_hash_bytes'] == 'true':
 				resp_obj['result'] = hex_switchEndian(resp_obj['result'])
@@ -140,7 +140,7 @@ def get_rpc_cookie():
 	if 'datadir' in settings and not use_userpass:
 		use_datadir = True
 	if not use_userpass and not use_datadir:
-		print("Missing datadir or username and/or password in cfg file", file=stderr)
+		print("Missing datadir or username and/or password in cfg file", file=sys.stderr)
 		sys.exit(1)
 
 	settings['port'] = int(settings['port'])
diff --git a/contrib/rpm/README.md b/contrib/rpm/README.md
index 4ab2f3568..e1e0745fd 100644
--- a/contrib/rpm/README.md
+++ b/contrib/rpm/README.md
@@ -84,16 +84,16 @@ If you would prefer not to build the GUI at all, you can pass the switch
 
 The desktop and KDE meta files are created in the spec file itself with the
 `cat` command. This is done to allow easy distribution specific changes without
-needing to use any patches. A specific time stamp is given to the files so that
+needing to use any patches. A specific timestamp is given to the files so that
 it does not they do not appear to have been updated every time the package is
-built. If you do make changes to them, you probably should update time stamp
-assigned to them in the `touch` command that specifies the time stamp.
+built. If you do make changes to them, you probably should update timestamp
+assigned to them in the `touch` command that specifies the timestamp.
 
 ## SVG, PNG, and XPM Icons
 
 The `bitcoin.svg` file is from the source listed as `Source100`. It is used as
 the source for the PNG and XPM files. The generated PNG and XPM files are given
-the same time stamp as the source SVG file as a means of indicating they are
+the same timestamp as the source SVG file as a means of indicating they are
 derived from it.
 
 ## Systemd
@@ -105,10 +105,10 @@ distributions that still receive vendor updates do in fact use systemd.
 The files to control the service are created in the RPM spec file itself using
 the `cat` command. This is done to make it easy to modify for other
 distributions that may implement things differently without needing to patch
-source. A specific time stamp is given to the files so that they do not appear
+source. A specific timestamp is given to the files so that they do not appear
 to have been updated every time the package is built. If you do make changes to
-them, you probably should update the time stamp assigned to them in the `touch`
-command that specifies the time stamp.
+them, you probably should update the timestamp assigned to them in the `touch`
+command that specifies the timestamp.
 
 ## SELinux
 
diff --git a/contrib/rpm/bitcoin.spec b/contrib/rpm/bitcoin.spec
index cc54fcaf3..7c4d933ee 100644
--- a/contrib/rpm/bitcoin.spec
+++ b/contrib/rpm/bitcoin.spec
@@ -336,6 +336,8 @@ done
 %{_sbindir}/semanage port -a -t bitcoin_port_t -p tcp 8333
 %{_sbindir}/semanage port -a -t bitcoin_port_t -p tcp 18332
 %{_sbindir}/semanage port -a -t bitcoin_port_t -p tcp 18333
+%{_sbindir}/semanage port -a -t bitcoin_port_t -p tcp 18443
+%{_sbindir}/semanage port -a -t bitcoin_port_t -p tcp 18444
 %{_sbindir}/fixfiles -R bitcoin-server restore &> /dev/null || :
 %{_sbindir}/restorecon -R %{_localstatedir}/lib/bitcoin || :
 fi
@@ -355,6 +357,8 @@ if [ $1 -eq 0 ]; then
 	%{_sbindir}/semanage port -d -p tcp 8333
 	%{_sbindir}/semanage port -d -p tcp 18332
 	%{_sbindir}/semanage port -d -p tcp 18333
+	%{_sbindir}/semanage port -d -p tcp 18443
+	%{_sbindir}/semanage port -d -p tcp 18444
 	for selinuxvariant in %{selinux_variants}; do
 		%{_sbindir}/semodule -s ${selinuxvariant} -r bitcoin &> /dev/null || :
 	done
diff --git a/contrib/seeds/generate-seeds.py b/contrib/seeds/generate-seeds.py
index b0ac92ae0..28068a752 100755
--- a/contrib/seeds/generate-seeds.py
+++ b/contrib/seeds/generate-seeds.py
@@ -114,7 +114,7 @@ def process_nodes(g, f, structname, defaultport):
 def main():
     if len(sys.argv)<2:
         print(('Usage: %s <path_to_nodes_txt>' % sys.argv[0]), file=sys.stderr)
-        exit(1)
+        sys.exit(1)
     g = sys.stdout
     indir = sys.argv[1]
     g.write('#ifndef BITCOIN_CHAINPARAMSSEEDS_H\n')
diff --git a/contrib/verify-commits/gpg.sh b/contrib/verify-commits/gpg.sh
index b01e2a6d3..abd8f5fd9 100755
--- a/contrib/verify-commits/gpg.sh
+++ b/contrib/verify-commits/gpg.sh
@@ -46,6 +46,11 @@ for LINE in $(echo "$GPG_RES"); do
 		REVSIG=true
 		GOODREVSIG="[GNUPG:] GOODSIG ${LINE#* * *}"
 		;;
+	"[GNUPG:] EXPKEYSIG "*)
+		[ "$BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG" != 1 ] && exit 1
+		REVSIG=true
+		GOODREVSIG="[GNUPG:] GOODSIG ${LINE#* * *}"
+		;;
 	esac
 done
 if ! $VALID; then
diff --git a/contrib/verify-commits/verify-commits.sh b/contrib/verify-commits/verify-commits.sh
index 74b7f3837..7194b040e 100755
--- a/contrib/verify-commits/verify-commits.sh
+++ b/contrib/verify-commits/verify-commits.sh
@@ -39,7 +39,7 @@ PREV_COMMIT=""
 while true; do
 	if [ "$CURRENT_COMMIT" = $VERIFIED_ROOT ]; then
 		echo "There is a valid path from "$CURRENT_COMMIT" to $VERIFIED_ROOT where all commits are signed!"
-		exit 0;
+		exit 0
 	fi
 
 	if [ "$CURRENT_COMMIT" = $VERIFIED_SHA512_ROOT ]; then
diff --git a/contrib/zmq/zmq_sub.py b/contrib/zmq/zmq_sub.py
index ea398a27e..5cc19761d 100755
--- a/contrib/zmq/zmq_sub.py
+++ b/contrib/zmq/zmq_sub.py
@@ -32,7 +32,7 @@
 
 if not (sys.version_info.major >= 3 and sys.version_info.minor >= 5):
     print("This example only works with Python 3.5 and greater")
-    exit(1)
+    sys.exit(1)
 
 port = 28332
 
diff --git a/contrib/zmq/zmq_sub3.4.py b/contrib/zmq/zmq_sub3.4.py
index 1cb7eec0c..bfb7ea9ea 100755
--- a/contrib/zmq/zmq_sub3.4.py
+++ b/contrib/zmq/zmq_sub3.4.py
@@ -36,7 +36,7 @@
 
 if not (sys.version_info.major >= 3 and sys.version_info.minor >= 4):
     print("This example only works with Python 3.4 and greater")
-    exit(1)
+    sys.exit(1)
 
 port = 28332
 
diff --git a/depends/packages/libevent.mk b/depends/packages/libevent.mk
index 00231d75d..5f622f8e6 100644
--- a/depends/packages/libevent.mk
+++ b/depends/packages/libevent.mk
@@ -9,7 +9,7 @@ define $(package)_preprocess_cmds
 endef
 
 define $(package)_set_vars
-  $(package)_config_opts=--disable-shared --disable-openssl --disable-libevent-regress
+  $(package)_config_opts=--disable-shared --disable-openssl --disable-libevent-regress --disable-samples
   $(package)_config_opts_release=--disable-debug-mode
   $(package)_config_opts_linux=--with-pic
 endef
diff --git a/depends/packages/native_ds_store.mk b/depends/packages/native_ds_store.mk
index 49f5829ac..116fa25d3 100644
--- a/depends/packages/native_ds_store.mk
+++ b/depends/packages/native_ds_store.mk
@@ -1,9 +1,8 @@
 package=native_ds_store
-$(package)_version=1.1.0
-$(package)_download_path=https://bitbucket.org/al45tair/ds_store/get
-$(package)_download_file=v$($(package)_version).tar.bz2
-$(package)_file_name=$(package)-$($(package)_version).tar.bz2
-$(package)_sha256_hash=921596764d71d1bbd3297a90ef6d286f718794d667e4f81d91d14053525d64c1
+$(package)_version=1.1.2
+$(package)_download_path=https://github.com/al45tair/ds_store/archive/
+$(package)_file_name=v$($(package)_version).tar.gz
+$(package)_sha256_hash=3b3ecb7bf0a5157f5b6010bc3af7c141fb0ad3527084e63336220d22744bc20c
 $(package)_install_libdir=$(build_prefix)/lib/python/dist-packages
 $(package)_dependencies=native_biplist
 
diff --git a/depends/packages/native_mac_alias.mk b/depends/packages/native_mac_alias.mk
index 85a8a402b..488ec8b59 100644
--- a/depends/packages/native_mac_alias.mk
+++ b/depends/packages/native_mac_alias.mk
@@ -1,14 +1,13 @@
 package=native_mac_alias
-$(package)_version=1.1.0
-$(package)_download_path=https://bitbucket.org/al45tair/mac_alias/get
-$(package)_download_file=v$($(package)_version).tar.bz2
-$(package)_file_name=$(package)-$($(package)_version).tar.bz2
-$(package)_sha256_hash=87ad827e66790028361e43fc754f68ed041a9bdb214cca03c853f079b04fb120
+$(package)_version=2.0.6
+$(package)_download_path=https://github.com/al45tair/mac_alias/archive/
+$(package)_file_name=v$($(package)_version).tar.gz
+$(package)_sha256_hash=78a3332d9a597eebf09ae652d38ad1e263b28db5c2e6dd725fad357b03b77371
 $(package)_install_libdir=$(build_prefix)/lib/python/dist-packages
 $(package)_patches=python3.patch
 
 define $(package)_preprocess_cmds
-  patch -p1 < $($(package)_patch_dir)/python3.patch
+    patch -p1 < $($(package)_patch_dir)/python3.patch
 endef
 
 define $(package)_build_cmds
diff --git a/depends/patches/native_mac_alias/python3.patch b/depends/patches/native_mac_alias/python3.patch
index 1a32340be..6f2f5534a 100644
--- a/depends/patches/native_mac_alias/python3.patch
+++ b/depends/patches/native_mac_alias/python3.patch
@@ -1,7 +1,7 @@
 diff -dur a/mac_alias/alias.py b/mac_alias/alias.py
---- a/mac_alias/alias.py	2015-10-19 12:12:48.000000000 +0200
-+++ b/mac_alias/alias.py	2016-04-03 12:13:12.037159417 +0200
-@@ -243,10 +243,10 @@
+--- a/mac_alias/alias.py
++++ b/mac_alias/alias.py
+@@ -258,10 +258,10 @@
          alias = Alias()
          alias.appinfo = appinfo
              
@@ -14,7 +14,7 @@ diff -dur a/mac_alias/alias.py b/mac_alias/alias.py
                                     folder_cnid, cnid,
                                     crdate, creator_code, type_code)
          alias.target.levels_from = levels_from
-@@ -261,9 +261,9 @@
+@@ -276,9 +276,9 @@
                  b.read(1)
  
              if tag == TAG_CARBON_FOLDER_NAME:
@@ -26,7 +26,7 @@ diff -dur a/mac_alias/alias.py b/mac_alias/alias.py
                                                             value)
              elif tag == TAG_CARBON_PATH:
                  alias.target.carbon_path = value
-@@ -298,9 +298,9 @@
+@@ -313,9 +313,9 @@
                  alias.target.creation_date \
                      = mac_epoch + datetime.timedelta(seconds=seconds)
              elif tag == TAG_POSIX_PATH:
@@ -38,23 +38,7 @@ diff -dur a/mac_alias/alias.py b/mac_alias/alias.py
              elif tag == TAG_RECURSIVE_ALIAS_OF_DISK_IMAGE:
                  alias.volume.disk_image_alias = Alias.from_bytes(value)
              elif tag == TAG_USER_HOME_LENGTH_PREFIX:
-@@ -422,13 +422,13 @@
-         #       (so doing so is ridiculous, and nothing could rely on it).
-         b.write(struct.pack(b'>h28pI2shI64pII4s4shhI2s10s',
-                             self.target.kind,
--                            carbon_volname, voldate,
-+                            carbon_volname, int(voldate),
-                             self.volume.fs_type,
-                             self.volume.disk_type,
-                             self.target.folder_cnid,
-                             carbon_filename,
-                             self.target.cnid,
--                            crdate,
-+                            int(crdate),
-                             self.target.creator_code,
-                             self.target.type_code,
-                             self.target.levels_from,
-@@ -449,12 +449,12 @@
+@@ -467,12 +467,12 @@
  
          b.write(struct.pack(b'>hhQhhQ',
                  TAG_HIGH_RES_VOLUME_CREATION_DATE,
diff --git a/doc/README.md b/doc/README.md
index 275ae67e5..988019869 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -37,6 +37,7 @@ Building
 ---------------------
 The following are developer notes on how to build Bitcoin on your native platform. They are not complete guides, but include notes on the necessary libraries, compile flags, etc.
 
+- [Dependencies](dependencies.md)
 - [OS X Build Notes](build-osx.md)
 - [Unix Build Notes](build-unix.md)
 - [Windows Build Notes](build-windows.md)
diff --git a/doc/REST-interface.md b/doc/REST-interface.md
index caf678288..f3dc124ec 100644
--- a/doc/REST-interface.md
+++ b/doc/REST-interface.md
@@ -3,19 +3,20 @@ Unauthenticated REST Interface
 
 The REST API can be enabled with the `-rest` option.
 
-The interface runs on the same port as the JSON-RPC interface, by default port 8332 for mainnet and port 18332 for testnet.
+The interface runs on the same port as the JSON-RPC interface, by default port 8332 for mainnet, port 18332 for testnet,
+and port 18443 for regtest.
 
 Supported API
 -------------
 
-####Transactions
+#### Transactions
 `GET /rest/tx/<TX-HASH>.<bin|hex|json>`
 
 Given a transaction hash: returns a transaction in binary, hex-encoded binary, or JSON formats.
 
 For full TX query capability, one must enable the transaction index via "txindex=1" command line / configuration option.
 
-####Blocks
+#### Blocks
 `GET /rest/block/<BLOCK-HASH>.<bin|hex|json>`
 `GET /rest/block/notxdetails/<BLOCK-HASH>.<bin|hex|json>`
 
@@ -25,12 +26,12 @@ The HTTP request and response are both handled entirely in-memory, thus making m
 
 With the /notxdetails/ option JSON response will only contain the transaction hash instead of the complete transaction details. The option only affects the JSON response.
 
-####Blockheaders
+#### Blockheaders
 `GET /rest/headers/<COUNT>/<BLOCK-HASH>.<bin|hex|json>`
 
 Given a block hash: returns <COUNT> amount of blockheaders in upward direction.
 
-####Chaininfos
+#### Chaininfos
 `GET /rest/chaininfo.json`
 
 Returns various state info regarding block chain processing.
@@ -48,7 +49,7 @@ Only supports JSON as output format.
 * softforks : (array) status of softforks in progress
 * bip9_softforks : (object) status of BIP9 softforks in progress
 
-####Query UTXO set
+#### Query UTXO set
 `GET /rest/getutxos/<checkmempool>/<txid>-<n>/<txid>-<n>/.../<txid>-<n>.<bin|hex|json>`
 
 The getutxo command allows querying of the UTXO set given a set of outpoints.
@@ -81,7 +82,7 @@ $ curl localhost:18332/rest/getutxos/checkmempool/b2cdfd7b89def827ff8af7cd9bff76
 }
 ```
 
-####Memory pool
+#### Memory pool
 `GET /rest/mempool/info.json`
 
 Returns various information about the TX mempool.
diff --git a/doc/build-openbsd.md b/doc/build-openbsd.md
index f4a9826d8..4ea8e30b5 100644
--- a/doc/build-openbsd.md
+++ b/doc/build-openbsd.md
@@ -1,6 +1,6 @@
 OpenBSD build guide
 ======================
-(updated for OpenBSD 6.0)
+(updated for OpenBSD 6.1)
 
 This guide describes how to build bitcoind and command-line utilities on OpenBSD.
 
@@ -18,12 +18,12 @@ pkg_add automake # (select highest version, e.g. 1.15)
 pkg_add python # (select highest version, e.g. 3.5)
 ```
 
-The default C++ compiler that comes with OpenBSD 5.9 is g++ 4.2. This version is old (from 2007), and is not able to compile the current version of Bitcoin Core, primarily as it has no C++11 support, but even before there were issues. So here we will be installing a newer compiler.
+See [dependencies.md](dependencies.md) for a complete overview.
 
 GCC
 -------
 
-You can install a newer version of gcc with:
+The default C++ compiler that comes with OpenBSD 5.9 is g++ 4.2. This version is old (from 2007), and is not able to compile the current version of Bitcoin Core, primarily as it has no C++11 support, but even before there were issues. So here we will be installing a newer compiler:
 
 ```bash
 pkg_add g++ # (select newest 4.x version, e.g. 4.9.3)
@@ -48,13 +48,13 @@ BOOST_PREFIX="${BITCOIN_ROOT}/boost"
 mkdir -p $BOOST_PREFIX
 
 # Fetch the source and verify that it is not tampered with
-curl -o boost_1_61_0.tar.bz2 http://heanet.dl.sourceforge.net/project/boost/boost/1.61.0/boost_1_61_0.tar.bz2
-echo 'a547bd06c2fd9a71ba1d169d9cf0339da7ebf4753849a8f7d6fdb8feee99b640  boost_1_61_0.tar.bz2' | sha256 -c
-# MUST output: (SHA256) boost_1_61_0.tar.bz2: OK
-tar -xjf boost_1_61_0.tar.bz2
+curl -o boost_1_64_0.tar.bz2 https://netcologne.dl.sourceforge.net/project/boost/boost/1.64.0/boost_1_64_0.tar.bz2
+echo '7bcc5caace97baa948931d712ea5f37038dbb1c5d89b43ad4def4ed7cb683332 boost_1_64_0.tar.bz2' | sha256 -c
+# MUST output: (SHA256) boost_1_64_0.tar.bz2: OK
+tar -xjf boost_1_64_0.tar.bz2
 
-# Boost 1.61 needs one small patch for OpenBSD
-cd boost_1_61_0
+# Boost 1.64 needs one small patch for OpenBSD
+cd boost_1_64_0
 # Also here: https://gist.githubusercontent.com/laanwj/bf359281dc319b8ff2e1/raw/92250de8404b97bb99d72ab898f4a8cb35ae1ea3/patch-boost_test_impl_execution_monitor_ipp.patch
 patch -p0 < /usr/ports/devel/boost/patches/patch-boost_test_impl_execution_monitor_ipp
 
diff --git a/doc/build-osx.md b/doc/build-osx.md
index 32d7dbd69..836c856a6 100644
--- a/doc/build-osx.md
+++ b/doc/build-osx.md
@@ -16,7 +16,9 @@ Then install [Homebrew](https://brew.sh).
 Dependencies
 ----------------------
 
-    brew install automake berkeley-db4 libtool boost --c++11 miniupnpc openssl pkg-config protobuf qt libevent
+    brew install automake berkeley-db4 libtool boost --c++11 miniupnpc openssl pkg-config protobuf python3 qt libevent
+
+See [dependencies.md](dependencies.md) for a complete overview.
 
 If you want to build the disk image with `make deploy` (.dmg / optional), you need RSVG
 
diff --git a/doc/build-unix.md b/doc/build-unix.md
index b7eae2a63..8a102abae 100644
--- a/doc/build-unix.md
+++ b/doc/build-unix.md
@@ -49,7 +49,7 @@ Optional dependencies:
  univalue    | Utility          | JSON parsing and encoding (bundled version will be used unless --with-system-univalue passed to configure)
  libzmq3     | ZMQ notification | Optional, allows generating ZMQ notifications (requires ZMQ version >= 4.x)
 
-For the versions used in the release, see [release-process.md](release-process.md) under *Fetch and build inputs*.
+For the versions used, see [dependencies.md](dependencies.md)
 
 Memory Requirements
 --------------------
@@ -65,7 +65,7 @@ Dependency Build Instructions: Ubuntu & Debian
 ----------------------------------------------
 Build requirements:
 
-    sudo apt-get install build-essential libtool autotools-dev automake pkg-config libssl-dev libevent-dev bsdmainutils
+    sudo apt-get install build-essential libtool autotools-dev automake pkg-config libssl-dev libevent-dev bsdmainutils python3
 
 Options when installing required Boost library files:
 
@@ -131,7 +131,7 @@ Dependency Build Instructions: Fedora
 -------------------------------------
 Build requirements:
 
-    sudo dnf install gcc-c++ libtool make autoconf automake openssl-devel libevent-devel boost-devel libdb4-devel libdb4-cxx-devel
+    sudo dnf install gcc-c++ libtool make autoconf automake openssl-devel libevent-devel boost-devel libdb4-devel libdb4-cxx-devel python3
 
 Optional:
 
diff --git a/doc/build-windows.md b/doc/build-windows.md
index 9549a4b9d..0d96af26a 100644
--- a/doc/build-windows.md
+++ b/doc/build-windows.md
@@ -4,7 +4,11 @@ WINDOWS BUILD NOTES
 Below are some notes on how to build Bitcoin Core for Windows.
 
 Most developers use cross-compilation from Ubuntu to build executables for
-Windows. This is also used to build the release binaries.
+Windows. Cross-compilation is also used to build the release binaries.
+
+Currently only building on Ubuntu Trusty 14.04 or Ubuntu Zesty 17.04 or later is supported.
+Building on Ubuntu Xenial 16.04 is known to be broken, see extensive discussion in issue [8732](https://github.com/bitcoin/bitcoin/issues/8732).
+While it may be possible to do so with work arounds, it's potentially dangerous and not recommended.
 
 While there are potentially a number of ways to build on Windows (for example using msys / mingw-w64),
 using the Windows Subsystem For Linux is the most straightforward. If you are building with
@@ -59,6 +63,15 @@ A host toolchain (`build-essential`) is necessary because some dependency
 packages (such as `protobuf`) need to build host utilities that are used in the
 build process.
 
+See also: [dependencies.md](dependencies.md).
+
+If you're building on Ubuntu 17.04 or later, run these two commands, selecting the 'posix' variant for both,
+to work around issues with mingw-w64. See issue [8732](https://github.com/bitcoin/bitcoin/issues/8732) for more information.
+```
+sudo update-alternatives --config x86_64-w64-mingw32-g++
+sudo update-alternatives --config x86_64-w64-mingw32-gcc
+```
+
 ## Building for 64-bit Windows
 
 To build executables for Windows 64-bit, install the following dependencies:
@@ -67,6 +80,7 @@ To build executables for Windows 64-bit, install the following dependencies:
 
 Then build using:
 
+    PATH=$(echo "$PATH" | sed -e 's/:\/mnt.*//g') # strip out problematic Windows %PATH% imported var
     cd depends
     make HOST=x86_64-w64-mingw32
     cd ..
@@ -78,10 +92,11 @@ Then build using:
 
 To build executables for Windows 32-bit, install the following dependencies:
 
-    sudo apt-get install g++-mingw-w64-i686 mingw-w64-i686-dev 
+    sudo apt-get install g++-mingw-w64-i686 mingw-w64-i686-dev
 
 Then build using:
 
+    PATH=$(echo "$PATH" | sed -e 's/:\/mnt.*//g') # strip out problematic Windows %PATH% imported var
     cd depends
     make HOST=i686-w64-mingw32
     cd ..
diff --git a/doc/dependencies.md b/doc/dependencies.md
new file mode 100644
index 000000000..964c03ba8
--- /dev/null
+++ b/doc/dependencies.md
@@ -0,0 +1,31 @@
+Dependencies
+============
+
+These are the dependencies currently used by Bitcoin Core. You can find instructions for installing them in the `build-*.md` file for your platform.
+
+| Dependency | Version used | Minimum required | CVEs | Shared | [Bundled Qt library](https://doc.qt.io/qt-5/configure-options.html) |
+| --- | --- | --- | --- | --- | --- |
+| Berkeley DB | [4.8.30](http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html) | 4.8.x | No |  |  |
+| Boost | [1.64.0](http://www.boost.org/users/download/) | [1.47.0](https://github.com/bitcoin/bitcoin/pull/8920) | No |  |  |
+| ccache | [3.3.4](https://ccache.samba.org/download.html) |  | No |  |  |
+| Clang |  | [3.3+](http://llvm.org/releases/download.html) (C++11 support) |  |  |  |
+| D-Bus | [1.10.18](https://cgit.freedesktop.org/dbus/dbus/tree/NEWS?h=dbus-1.10) |  | No | Yes |  |
+| Expat | [2.2.1](https://libexpat.github.io/) |  | No | Yes |  |
+| fontconfig | [2.12.1](https://www.freedesktop.org/software/fontconfig/release/) |  | No | Yes |  |
+| FreeType | [2.7.1](http://download.savannah.gnu.org/releases/freetype) |  | No |  |  |
+| GCC |  | [4.7+](https://gcc.gnu.org/) |  |  |  |
+| HarfBuzz-NG |  |  |  |  |  |
+| libevent | [2.1.8-stable](https://github.com/libevent/libevent/releases) | 2.0.22 | No |  |  |
+| libjpeg |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L75) |
+| libpng |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L74) |
+| MiniUPnPc | [2.0.20170509](http://miniupnp.free.fr/files) |  | No |  |  |
+| OpenSSL | [1.0.1k](https://www.openssl.org/source) |  | Yes |  |  |
+| PCRE |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L76) |
+| protobuf | [2.6.3](https://github.com/google/protobuf/releases) |  | No |  |  |
+| Python (tests) |  | [3.4](https://www.python.org/downloads) |  |  |  |
+| qrencode | [3.4.4](https://fukuchi.org/works/qrencode) |  | No |  |  |
+| Qt | [5.7.1](https://download.qt.io/official_releases/qt/) | 4.7+ | No |  |  |
+| XCB |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L94) (Linux only) |
+| xkbcommon |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L93) (Linux only) |
+| ZeroMQ | [4.1.5](https://github.com/zeromq/libzmq/releases) |  | No |  |  |
+| zlib | [1.2.11](http://zlib.net/) |  |  |  | No |
diff --git a/doc/developer-notes.md b/doc/developer-notes.md
index d783a7a8a..33c6ab9cb 100644
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -4,7 +4,7 @@ Developer Notes
 Various coding styles have been used during the history of the codebase,
 and the result is not very consistent. However, we're now trying to converge to
 a single style, which is specified below. When writing patches, favor the new
-style over attempting to mimick the surrounding style, except for move-only
+style over attempting to mimic the surrounding style, except for move-only
 commits.
 
 Do not submit patches solely to modify the style of existing code.
@@ -37,6 +37,8 @@ code.
 
 - **Miscellaneous**
   - `++i` is preferred over `i++`.
+  - `nullptr` is preferred over `NULL` or `(void*)0`.
+  - `static_assert` is preferred over `assert` where possible. Generally; compile-time checking is preferred over run-time checking.
 
 Block style example:
 ```c++
@@ -275,7 +277,7 @@ Wallet
 
   - *Rationale*: In RPC code that conditionally uses the wallet (such as
     `validateaddress`) it is easy to forget that global pointer `pwalletMain`
-    can be NULL. See `test/functional/disablewallet.py` for functional tests
+    can be nullptr. See `test/functional/disablewallet.py` for functional tests
     exercising the API with `-disablewallet`
 
 - Include `db_cxx.h` (BerkeleyDB header) only when `ENABLE_WALLET` is set
@@ -330,6 +332,12 @@ C++ data structures
   - *Rationale*: Ensure determinism by avoiding accidental use of uninitialized
     values. Also, static analyzers balk about this.
 
+- By default, declare single-argument constructors `explicit`.
+
+  - *Rationale*: This is a precaution to avoid unintended conversions that might
+    arise when single-argument constructors are used as implicit conversion
+    functions.
+
 - Use explicitly signed or unsigned `char`s, or even better `uint8_t` and
   `int8_t`. Do not use bare `char` unless it is to pass to a third-party API.
   This type can be signed or unsigned depending on the architecture, which can
@@ -541,6 +549,26 @@ Git and GitHub tips
   or `git fetch upstream-pull`. Afterwards, you can use `upstream-pull/NUMBER/head` in arguments to `git show`,
   `git checkout` and anywhere a commit id would be acceptable to see the changes from pull request NUMBER.
 
+Scripted diffs
+--------------
+
+For reformatting and refactoring commits where the changes can be easily automated using a bash script, we use
+scripted-diff commits. The bash script is included in the commit message and our Travis CI job checks that
+the result of the script is identical to the commit. This aids reviewers since they can verify that the script
+does exactly what it's supposed to do. It is also helpful for rebasing (since the same script can just be re-run
+on the new master commit).
+
+To create a scripted-diff:
+
+- start the commit message with `scripted-diff:` (and then a description of the diff on the same line)
+- in the commit message include the bash script between lines containing just the following text:
+    - `-BEGIN VERIFY SCRIPT-`
+    - `-END VERIFY SCRIPT-`
+
+The scripted-diff is verified by the tool `contrib/devtools/commit-script-check.sh`
+
+Commit `bb81e173` is an example of a scripted-diff.
+
 RPC interface guidelines
 --------------------------
 
@@ -570,16 +598,14 @@ A few guidelines for introducing and reviewing new RPC interfaces:
     is specified as-is in BIP22.
 
 - Missing arguments and 'null' should be treated the same: as default values. If there is no
-  default value, both cases should fail in the same way.
+  default value, both cases should fail in the same way. The easiest way to follow this
+  guideline is detect unspecified arguments with `params[x].isNull()` instead of
+  `params.size() <= x`. The former returns true if the argument is either null or missing,
+  while the latter returns true if is missing, and false if it is null.
 
   - *Rationale*: Avoids surprises when switching to name-based arguments. Missing name-based arguments
   are passed as 'null'.
 
-  - *Exception*: Many legacy exceptions to this exist, one of the worst ones is
-    `getbalance` which follows a completely different code path based on the
-    number of arguments. We are still in the process of cleaning these up. Do not introduce
-    new ones.
-
 - Try not to overload methods on argument type. E.g. don't make `getblock(true)` and `getblock("hash")`
   do different things.
 
@@ -607,9 +633,14 @@ A few guidelines for introducing and reviewing new RPC interfaces:
     from there.
 
 - A RPC method must either be a wallet method or a non-wallet method. Do not
-  introduce new methods such as `getinfo` and `signrawtransaction` that differ
-  in behavior based on presence of a wallet.
+  introduce new methods such as `signrawtransaction` that differ in behavior
+  based on presence of a wallet.
 
   - *Rationale*: as well as complicating the implementation and interfering
     with the introduction of multi-wallet, wallet and non-wallet code should be
     separated to avoid introducing circular dependencies between code units.
+
+- Try to make the RPC response a JSON object.
+
+  - *Rationale*: If a RPC response is not a JSON object then it is harder to avoid API breakage if
+    new data in the response is needed.
diff --git a/doc/files.md b/doc/files.md
index 928977143..3d603445f 100644
--- a/doc/files.md
+++ b/doc/files.md
@@ -15,6 +15,7 @@
 * wallet.dat: personal wallet (BDB) with keys and transactions
 * .cookie: session RPC authentication cookie (written at start when cookie authentication is used, deleted on shutdown): since 0.12.0
 * onion_private_key: cached Tor hidden service private key for `-listenonion`: since 0.12.0
+* guisettings.ini.bak: backup of former GUI settings after `-resetguisettings` is used
 
 Only used in pre-0.8.0
 ---------------------
diff --git a/doc/gitian-building.md b/doc/gitian-building.md
index 9f9afaf04..3a48f4a0b 100644
--- a/doc/gitian-building.md
+++ b/doc/gitian-building.md
@@ -1,480 +1,4 @@
 Gitian building
 ================
 
-*Setup instructions for a Gitian build of Bitcoin Core using a Debian VM or physical system.*
-
-Gitian is the deterministic build process that is used to build the Bitcoin
-Core executables. It provides a way to be reasonably sure that the
-executables are really built from the source on GitHub. It also makes sure that
-the same, tested dependencies are used and statically built into the executable.
-
-Multiple developers build the source code by following a specific descriptor
-("recipe"), cryptographically sign the result, and upload the resulting signature.
-These results are compared and only if they match, the build is accepted and uploaded
-to bitcoin.org.
-
-More independent Gitian builders are needed, which is why this guide exists.
-It is preferred you follow these steps yourself instead of using someone else's
-VM image to avoid 'contaminating' the build.
-
-Table of Contents
-------------------
-
-- [Create a new VirtualBox VM](#create-a-new-virtualbox-vm)
-- [Connecting to the VM](#connecting-to-the-vm)
-- [Setting up Debian for Gitian building](#setting-up-debian-for-gitian-building)
-- [Installing Gitian](#installing-gitian)
-- [Setting up the Gitian image](#setting-up-the-gitian-image)
-- [Getting and building the inputs](#getting-and-building-the-inputs)
-- [Building Bitcoin Core](#building-bitcoin-core)
-- [Building an alternative repository](#building-an-alternative-repository)
-- [Signing externally](#signing-externally)
-- [Uploading signatures](#uploading-signatures)
-
-Preparing the Gitian builder host
----------------------------------
-
-The first step is to prepare the host environment that will be used to perform the Gitian builds.
-This guide explains how to set up the environment, and how to start the builds.
-
-Debian Linux was chosen as the host distribution because it has a lightweight install (in contrast to Ubuntu) and is readily available.
-Any kind of virtualization can be used, for example:
-- [VirtualBox](https://www.virtualbox.org/) (covered by this guide)
-- [KVM](http://www.linux-kvm.org/page/Main_Page)
-- [LXC](https://linuxcontainers.org/), see also [Gitian host docker container](https://github.com/gdm85/tenku/tree/master/docker/gitian-bitcoin-host/README.md).
-
-You can also install Gitian on actual hardware instead of using virtualization.
-
-Create a new VirtualBox VM
----------------------------
-In the VirtualBox GUI click "New" and choose the following parameters in the wizard:
-
-![](gitian-building/create_new_vm.png)
-
-- Type: Linux, Debian (64-bit)
-
-![](gitian-building/create_vm_memsize.png)
-
-- Memory Size: at least 3000MB, anything less and the build might not complete.
-
-![](gitian-building/create_vm_hard_disk.png)
-
-- Hard Disk: Create a virtual hard disk now
-
-![](gitian-building/create_vm_hard_disk_file_type.png)
-
-- Hard Disk file type: Use the default, VDI (VirtualBox Disk Image)
-
-![](gitian-building/create_vm_storage_physical_hard_disk.png)
-
-- Storage on physical hard disk: Dynamically Allocated
-
-![](gitian-building/create_vm_file_location_size.png)
-
-- File location and size: at least 40GB; as low as 20GB *may* be possible, but better to err on the safe side
-- Click `Create`
-
-After creating the VM, we need to configure it.
-
-- Click the `Settings` button, then go to the `Network` tab. Adapter 1 should be attached to `NAT`.
-
-![](gitian-building/network_settings.png)
-
-- Click `Advanced`, then `Port Forwarding`. We want to set up a port through which we can reach the VM to get files in and out.
-- Create a new rule by clicking the plus icon.
-
-![](gitian-building/port_forwarding_rules.png)
-
-- Set up the new rule the following way:
-  - Name: `SSH`
-  - Protocol: `TCP`
-  - Leave Host IP empty
-  - Host Port: `22222`
-  - Leave Guest IP empty
-  - Guest Port: `22`
-
-- Click `Ok` twice to save.
-
-Get the [Debian 8.x net installer](http://cdimage.debian.org/mirror/cdimage/archive/8.5.0/amd64/iso-cd/debian-8.5.0-amd64-netinst.iso) (a more recent minor version should also work, see also [Debian Network installation](https://www.debian.org/CD/netinst/)).
-This DVD image can be [validated](https://www.debian.org/CD/verify) using a SHA256 hashing tool, for example on
-Unixy OSes by entering the following in a terminal:
-
-    echo "ad4e8c27c561ad8248d5ebc1d36eb172f884057bfeb2c22ead823f59fa8c3dff  debian-8.5.0-amd64-netinst.iso" | sha256sum -c
-    # (must return OK)
-
-Then start the VM. On the first launch you will be asked for a CD or DVD image. Choose the downloaded ISO.
-
-![](gitian-building/select_startup_disk.png)
-
-Installing Debian
-------------------
-
-This section will explain how to install Debian on the newly created VM.
-
-- Choose the non-graphical installer.  We do not need the graphical environment; it will only increase installation time and disk usage.
-
-![](gitian-building/debian_install_1_boot_menu.png)
-
-**Note**: Navigating in the Debian installer:
-To keep a setting at the default and proceed, just press `Enter`.
-To select a different button, press `Tab`.
-
-- Choose locale and keyboard settings (doesn't matter, you can just go with the defaults or select your own information)
-
-![](gitian-building/debian_install_2_select_a_language.png)
-![](gitian-building/debian_install_3_select_location.png)
-![](gitian-building/debian_install_4_configure_keyboard.png)
-
-- The VM will detect network settings using DHCP, this should all proceed automatically
-- Configure the network:
-  - Hostname `debian`.
-  - Leave domain name empty.
-
-![](gitian-building/debian_install_5_configure_the_network.png)
-![](gitian-building/debian_install_6_domain_name.png)
-
-- Choose a root password and enter it twice (remember it for later)
-
-![](gitian-building/debian_install_6a_set_up_root_password.png)
-
-- Name the new user `debian` (the full name doesn't matter, you can leave it empty)
-- Set the account username as `debian`
-
-![](gitian-building/debian_install_7_set_up_user_fullname.png)
-![](gitian-building/debian_install_8_set_up_username.png)
-
-- Choose a user password and enter it twice (remember it for later)
-
-![](gitian-building/debian_install_9_user_password.png)
-
-- The installer will set up the clock using a time server; this process should be automatic
-- Set up the clock: choose a time zone (depends on the locale settings that you picked earlier; specifics don't matter)  
-
-![](gitian-building/debian_install_10_configure_clock.png)
-
-- Disk setup
-  - Partitioning method: Guided - Use the entire disk
-
-![](gitian-building/debian_install_11_partition_disks.png)
-
-  - Select disk to partition: SCSI1 (0,0,0)
-
-![](gitian-building/debian_install_12_choose_disk.png)
-
-  - Partition Disks -> *All files in one partition*
-
-![](gitian-building/all_files_in_one_partition.png)
-
-  - Finish partitioning and write changes to disk -> *Yes* (`Tab`, `Enter` to select the `Yes` button)
-
-![](gitian-building/debian_install_14_finish.png)
-![](gitian-building/debian_install_15_write_changes.png)
-
-- The base system will be installed, this will take a minute or so
-- Choose a mirror (any will do)
-
-![](gitian-building/debian_install_16_choose_a_mirror.png)
-
-- Enter proxy information (unless you are on an intranet, leave this empty)
-
-![](gitian-building/debian_install_18_proxy_settings.png)
-
-- Wait a bit while 'Select and install software' runs
-- Participate in popularity contest -> *No*
-- Choose software to install. We need just the base system.
-- Make sure only 'SSH server' and 'Standard System Utilities' are checked
-- Uncheck 'Debian Desktop Environment' and 'Print Server'
-
-![](gitian-building/debian_install_19_software_selection.png)
-
-- Install the GRUB boot loader to the master boot record? -> Yes
-
-![](gitian-building/debian_install_20_install_grub.png)
-
-- Device for boot loader installation -> ata-VBOX_HARDDISK
-
-![](gitian-building/debian_install_21_install_grub_bootloader.png)
-
-- Installation Complete -> *Continue*
-- After installation, the VM will reboot and you will have a working Debian VM. Congratulations!
-
-![](gitian-building/debian_install_22_finish_installation.png)
-
-
-After Installation
--------------------
-The next step in the guide involves logging in as root via SSH.
-SSH login for root users is disabled by default, so we'll enable that now.
-
-Login to the VM using username `root` and the root password you chose earlier.
-You'll be presented with a screen similar to this.
-
-![](gitian-building/debian_root_login.png)
-
-Type:
-
-```
-sed -i 's/^PermitRootLogin.*/PermitRootLogin yes/' /etc/ssh/sshd_config
-```
-and press enter. Then,
-```
-/etc/init.d/ssh restart
-```
-and enter to restart SSH. Logout by typing 'logout' and pressing 'enter'.
-
-Connecting to the VM
-----------------------
-
-After the VM has booted you can connect to it using SSH, and files can be copied from and to the VM using a SFTP utility.
-Connect to `localhost`, port `22222` (or the port configured when installing the VM).
-On Windows you can use [putty](http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html) and [WinSCP](http://winscp.net/eng/index.php).
-
-For example, to connect as `root` from a Linux command prompt use
-
-    $ ssh root@localhost -p 22222
-    The authenticity of host '[localhost]:22222 ([127.0.0.1]:22222)' can't be established.
-    RSA key fingerprint is ae:f5:c8:9f:17:c6:c7:1b:c2:1b:12:31:1d:bb:d0:c7.
-    Are you sure you want to continue connecting (yes/no)? yes
-    Warning: Permanently added '[localhost]:22222' (RSA) to the list of known hosts.
-    root@localhost's password: (enter root password configured during install)
-
-    The programs included with the Debian GNU/Linux system are free software;
-    the exact distribution terms for each program are described in the
-    individual files in /usr/share/doc/*/copyright.
-
-    Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
-    permitted by applicable law.
-    root@debian:~#
-
-Replace `root` with `debian` to log in as user.
-
-Setting up Debian for Gitian building
---------------------------------------
-
-In this section we will be setting up the Debian installation for Gitian building.
-
-First we need to log in as `root` to set up dependencies and make sure that our
-user can use the sudo command. Type/paste the following in the terminal:
-
-```bash
-apt-get install git ruby sudo apt-cacher-ng qemu-utils debootstrap lxc python-cheetah parted kpartx bridge-utils make ubuntu-archive-keyring curl
-adduser debian sudo
-```
-
-Then set up LXC and the rest with the following, which is a complex jumble of settings and workarounds:
-
-```bash
-# the version of lxc-start in Debian needs to run as root, so make sure
-# that the build script can execute it without providing a password
-echo "%sudo ALL=NOPASSWD: /usr/bin/lxc-start" > /etc/sudoers.d/gitian-lxc
-echo "%sudo ALL=NOPASSWD: /usr/bin/lxc-execute" >> /etc/sudoers.d/gitian-lxc
-# make /etc/rc.local script that sets up bridge between guest and host
-echo '#!/bin/sh -e' > /etc/rc.local
-echo 'brctl addbr br0' >> /etc/rc.local
-echo 'ifconfig br0 10.0.3.2/24 up' >> /etc/rc.local
-echo 'iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE' >> /etc/rc.local
-echo 'echo 1 > /proc/sys/net/ipv4/ip_forward' >> /etc/rc.local
-echo 'exit 0' >> /etc/rc.local
-# make sure that USE_LXC is always set when logging in as debian,
-# and configure LXC IP addresses
-echo 'export USE_LXC=1' >> /home/debian/.profile
-echo 'export GITIAN_HOST_IP=10.0.3.2' >> /home/debian/.profile
-echo 'export LXC_GUEST_IP=10.0.3.5' >> /home/debian/.profile
-reboot
-```
-
-At the end the VM is rebooted to make sure that the changes take effect. The steps in this
-section only need to be performed once.
-
-Installing Gitian
-------------------
-
-Re-login as the user `debian` that was created during installation.
-The rest of the steps in this guide will be performed as that user.
-
-There is no `python-vm-builder` package in Debian, so we need to install it from source ourselves,
-
-```bash
-wget http://archive.ubuntu.com/ubuntu/pool/universe/v/vm-builder/vm-builder_0.12.4+bzr494.orig.tar.gz
-echo "76cbf8c52c391160b2641e7120dbade5afded713afaa6032f733a261f13e6a8e  vm-builder_0.12.4+bzr494.orig.tar.gz" | sha256sum -c
-# (verification -- must return OK)
-tar -zxvf vm-builder_0.12.4+bzr494.orig.tar.gz
-cd vm-builder-0.12.4+bzr494
-sudo python setup.py install
-cd ..
-```
-
-**Note**: When sudo asks for a password, enter the password for the user *debian* not for *root*.
-
-Clone the git repositories for bitcoin and Gitian.
-
-```bash
-git clone https://github.com/devrandom/gitian-builder.git
-git clone https://github.com/bitcoin/bitcoin
-git clone https://github.com/bitcoin-core/gitian.sigs.git
-```
-
-Setting up the Gitian image
--------------------------
-
-Gitian needs a virtual image of the operating system to build in.
-Currently this is Ubuntu Trusty x86_64.
-This image will be copied and used every time that a build is started to
-make sure that the build is deterministic.
-Creating the image will take a while, but only has to be done once.
-
-Execute the following as user `debian`:
-
-```bash
-cd gitian-builder
-bin/make-base-vm --lxc --arch amd64 --suite trusty
-```
-
-There will be a lot of warnings printed during the build of the image. These can be ignored.
-
-**Note**: When sudo asks for a password, enter the password for the user *debian* not for *root*.
-
-Getting and building the inputs
---------------------------------
-
-At this point you have two options, you can either use the automated script (found in [contrib/gitian-build.sh](/contrib/gitian-build.sh)) or you could manually do everything by following this guide. If you're using the automated script, then run it with the "--setup" command. Afterwards, run it with the "--build" command (example: "contrib/gitian-build.sh -b signer 0.13.0"). Otherwise ignore this.
-
-Follow the instructions in [doc/release-process.md](release-process.md#fetch-and-create-inputs-first-time-or-when-dependency-versions-change)
-in the bitcoin repository under 'Fetch and create inputs' to install sources which require
-manual intervention. Also optionally follow the next step: 'Seed the Gitian sources cache
-and offline git repositories' which will fetch the remaining files required for building
-offline.
-
-Building Bitcoin Core
-----------------
-
-To build Bitcoin Core (for Linux, OS X and Windows) just follow the steps under 'perform
-Gitian builds' in [doc/release-process.md](release-process.md#perform-gitian-builds) in the bitcoin repository.
-
-This may take some time as it will build all the dependencies needed for each descriptor.
-These dependencies will be cached after a successful build to avoid rebuilding them when possible.
-
-At any time you can check the package installation and build progress with
-
-```bash
-tail -f var/install.log
-tail -f var/build.log
-```
-
-Output from `gbuild` will look something like
-
-    Initialized empty Git repository in /home/debian/gitian-builder/inputs/bitcoin/.git/
-    remote: Counting objects: 57959, done.
-    remote: Total 57959 (delta 0), reused 0 (delta 0), pack-reused 57958
-    Receiving objects: 100% (57959/57959), 53.76 MiB | 484.00 KiB/s, done.
-    Resolving deltas: 100% (41590/41590), done.
-    From https://github.com/bitcoin/bitcoin
-    ... (new tags, new branch etc)
-    --- Building for trusty amd64 ---
-    Stopping target if it is up
-    Making a new image copy
-    stdin: is not a tty
-    Starting target
-    Checking if target is up
-    Preparing build environment
-    Updating apt-get repository (log in var/install.log)
-    Installing additional packages (log in var/install.log)
-    Grabbing package manifest
-    stdin: is not a tty
-    Creating build script (var/build-script)
-    lxc-start: Connection refused - inotify event with no name (mask 32768)
-    Running build script (log in var/build.log)
-
-Building an alternative repository
------------------------------------
-
-If you want to do a test build of a pull on GitHub it can be useful to point
-the Gitian builder at an alternative repository, using the same descriptors
-and inputs.
-
-For example:
-```bash
-URL=https://github.com/laanwj/bitcoin.git
-COMMIT=2014_03_windows_unicode_path
-./bin/gbuild --commit bitcoin=${COMMIT} --url bitcoin=${URL} ../bitcoin/contrib/gitian-descriptors/gitian-linux.yml
-./bin/gbuild --commit bitcoin=${COMMIT} --url bitcoin=${URL} ../bitcoin/contrib/gitian-descriptors/gitian-win.yml
-./bin/gbuild --commit bitcoin=${COMMIT} --url bitcoin=${URL} ../bitcoin/contrib/gitian-descriptors/gitian-osx.yml
-```
-
-Building fully offline
------------------------
-
-For building fully offline including attaching signatures to unsigned builds, the detached-sigs repository
-and the bitcoin git repository with the desired tag must both be available locally, and then gbuild must be
-told where to find them. It also requires an apt-cacher-ng which is fully-populated but set to offline mode, or
-manually disabling gitian-builder's use of apt-get to update the VM build environment.
-
-To configure apt-cacher-ng as an offline cacher, you will need to first populate its cache with the relevant
-files. You must additionally patch target-bin/bootstrap-fixup to set its apt sources to something other than
-plain archive.ubuntu.com: us.archive.ubuntu.com works.
-
-So, if you use LXC:
-
-```bash
-export PATH="$PATH":/path/to/gitian-builder/libexec
-export USE_LXC=1
-cd /path/to/gitian-builder
-./libexec/make-clean-vm --suite trusty --arch amd64
-
-LXC_ARCH=amd64 LXC_SUITE=trusty on-target -u root apt-get update
-LXC_ARCH=amd64 LXC_SUITE=trusty on-target -u root \
-  -e DEBIAN_FRONTEND=noninteractive apt-get --no-install-recommends -y install \
-  $( sed -ne '/^packages:/,/[^-] .*/ {/^- .*/{s/"//g;s/- //;p}}' ../bitcoin/contrib/gitian-descriptors/*|sort|uniq )
-LXC_ARCH=amd64 LXC_SUITE=trusty on-target -u root apt-get -q -y purge grub
-LXC_ARCH=amd64 LXC_SUITE=trusty on-target -u root -e DEBIAN_FRONTEND=noninteractive apt-get -y dist-upgrade
-```
-
-And then set offline mode for apt-cacher-ng:
-
-```
-/etc/apt-cacher-ng/acng.conf
-[...]
-Offlinemode: 1
-[...]
-
-service apt-cacher-ng restart
-```
-
-Then when building, override the remote URLs that gbuild would otherwise pull from the Gitian descriptors::
-```bash
-
-cd /some/root/path/
-git clone https://github.com/bitcoin-core/bitcoin-detached-sigs.git
-
-BTCPATH=/some/root/path/bitcoin
-SIGPATH=/some/root/path/bitcoin-detached-sigs
-
-./bin/gbuild --url bitcoin=${BTCPATH},signature=${SIGPATH} ../bitcoin/contrib/gitian-descriptors/gitian-win-signer.yml
-```
-
-Signing externally
--------------------
-
-If you want to do the PGP signing on another device, that's also possible; just define `SIGNER` as mentioned
-and follow the steps in the build process as normal.
-
-    gpg: skipped "laanwj": secret key not available
-
-When you execute `gsign` you will get an error from GPG, which can be ignored. Copy the resulting `.assert` files
-in `gitian.sigs` to your signing machine and do
-
-```bash
-    gpg --detach-sign ${VERSION}-linux/${SIGNER}/bitcoin-linux-build.assert
-    gpg --detach-sign ${VERSION}-win/${SIGNER}/bitcoin-win-build.assert
-    gpg --detach-sign ${VERSION}-osx-unsigned/${SIGNER}/bitcoin-osx-build.assert
-```
-
-This will create the `.sig` files that can be committed together with the `.assert` files to assert your
-Gitian build.
-
-Uploading signatures
----------------------
-
-After building and signing you can push your signatures (both the `.assert` and `.assert.sig` files) to the
-[bitcoin-core/gitian.sigs](https://github.com/bitcoin-core/gitian.sigs/) repository, or if that's not possible create a pull
-request. You can also mail the files to Wladimir (laanwj@gmail.com) and he will commit them.
+This file was moved to [the Bitcoin Core documentation repository](https://github.com/bitcoin-core/docs/blob/master/gitian-building.md) at [https://github.com/bitcoin-core/docs](https://github.com/bitcoin-core/docs).
diff --git a/doc/gitian-building/all_files_in_one_partition.png b/doc/gitian-building/all_files_in_one_partition.png
deleted file mode 100644
index 8cbb0d8ad..000000000
Binary files a/doc/gitian-building/all_files_in_one_partition.png and /dev/null differ
diff --git a/doc/gitian-building/create_new_vm.png b/doc/gitian-building/create_new_vm.png
deleted file mode 100644
index dd22428e1..000000000
Binary files a/doc/gitian-building/create_new_vm.png and /dev/null differ
diff --git a/doc/gitian-building/create_vm_file_location_size.png b/doc/gitian-building/create_vm_file_location_size.png
deleted file mode 100644
index 5f77206b6..000000000
Binary files a/doc/gitian-building/create_vm_file_location_size.png and /dev/null differ
diff --git a/doc/gitian-building/create_vm_hard_disk.png b/doc/gitian-building/create_vm_hard_disk.png
deleted file mode 100644
index 8e29816fa..000000000
Binary files a/doc/gitian-building/create_vm_hard_disk.png and /dev/null differ
diff --git a/doc/gitian-building/create_vm_hard_disk_file_type.png b/doc/gitian-building/create_vm_hard_disk_file_type.png
deleted file mode 100644
index a157211cf..000000000
Binary files a/doc/gitian-building/create_vm_hard_disk_file_type.png and /dev/null differ
diff --git a/doc/gitian-building/create_vm_memsize.png b/doc/gitian-building/create_vm_memsize.png
deleted file mode 100644
index 6f42cda73..000000000
Binary files a/doc/gitian-building/create_vm_memsize.png and /dev/null differ
diff --git a/doc/gitian-building/create_vm_storage_physical_hard_disk.png b/doc/gitian-building/create_vm_storage_physical_hard_disk.png
deleted file mode 100644
index cee16a6c6..000000000
Binary files a/doc/gitian-building/create_vm_storage_physical_hard_disk.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_10_configure_clock.png b/doc/gitian-building/debian_install_10_configure_clock.png
deleted file mode 100644
index 7cda038ae..000000000
Binary files a/doc/gitian-building/debian_install_10_configure_clock.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_11_partition_disks.png b/doc/gitian-building/debian_install_11_partition_disks.png
deleted file mode 100644
index 2a648c517..000000000
Binary files a/doc/gitian-building/debian_install_11_partition_disks.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_12_choose_disk.png b/doc/gitian-building/debian_install_12_choose_disk.png
deleted file mode 100644
index 0f3acc498..000000000
Binary files a/doc/gitian-building/debian_install_12_choose_disk.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_14_finish.png b/doc/gitian-building/debian_install_14_finish.png
deleted file mode 100644
index c8ef0b37a..000000000
Binary files a/doc/gitian-building/debian_install_14_finish.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_15_write_changes.png b/doc/gitian-building/debian_install_15_write_changes.png
deleted file mode 100644
index d8de00dec..000000000
Binary files a/doc/gitian-building/debian_install_15_write_changes.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_16_choose_a_mirror.png b/doc/gitian-building/debian_install_16_choose_a_mirror.png
deleted file mode 100644
index 0bd985b38..000000000
Binary files a/doc/gitian-building/debian_install_16_choose_a_mirror.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_18_proxy_settings.png b/doc/gitian-building/debian_install_18_proxy_settings.png
deleted file mode 100644
index 2c19919f6..000000000
Binary files a/doc/gitian-building/debian_install_18_proxy_settings.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_19_software_selection.png b/doc/gitian-building/debian_install_19_software_selection.png
deleted file mode 100644
index 5430456b1..000000000
Binary files a/doc/gitian-building/debian_install_19_software_selection.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_1_boot_menu.png b/doc/gitian-building/debian_install_1_boot_menu.png
deleted file mode 100644
index 216502e1c..000000000
Binary files a/doc/gitian-building/debian_install_1_boot_menu.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_20_install_grub.png b/doc/gitian-building/debian_install_20_install_grub.png
deleted file mode 100644
index d853c1587..000000000
Binary files a/doc/gitian-building/debian_install_20_install_grub.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_21_install_grub_bootloader.png b/doc/gitian-building/debian_install_21_install_grub_bootloader.png
deleted file mode 100644
index 493ab806a..000000000
Binary files a/doc/gitian-building/debian_install_21_install_grub_bootloader.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_22_finish_installation.png b/doc/gitian-building/debian_install_22_finish_installation.png
deleted file mode 100644
index 7c4445585..000000000
Binary files a/doc/gitian-building/debian_install_22_finish_installation.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_2_select_a_language.png b/doc/gitian-building/debian_install_2_select_a_language.png
deleted file mode 100644
index 0228ae2c0..000000000
Binary files a/doc/gitian-building/debian_install_2_select_a_language.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_3_select_location.png b/doc/gitian-building/debian_install_3_select_location.png
deleted file mode 100644
index 7b18fba97..000000000
Binary files a/doc/gitian-building/debian_install_3_select_location.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_4_configure_keyboard.png b/doc/gitian-building/debian_install_4_configure_keyboard.png
deleted file mode 100644
index 8e46117de..000000000
Binary files a/doc/gitian-building/debian_install_4_configure_keyboard.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_5_configure_the_network.png b/doc/gitian-building/debian_install_5_configure_the_network.png
deleted file mode 100644
index 8e3720f24..000000000
Binary files a/doc/gitian-building/debian_install_5_configure_the_network.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_6_domain_name.png b/doc/gitian-building/debian_install_6_domain_name.png
deleted file mode 100644
index 7a986d92f..000000000
Binary files a/doc/gitian-building/debian_install_6_domain_name.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_6a_set_up_root_password.png b/doc/gitian-building/debian_install_6a_set_up_root_password.png
deleted file mode 100644
index dcade1196..000000000
Binary files a/doc/gitian-building/debian_install_6a_set_up_root_password.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_7_set_up_user_fullname.png b/doc/gitian-building/debian_install_7_set_up_user_fullname.png
deleted file mode 100644
index 6763c6e08..000000000
Binary files a/doc/gitian-building/debian_install_7_set_up_user_fullname.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_8_set_up_username.png b/doc/gitian-building/debian_install_8_set_up_username.png
deleted file mode 100644
index bb04de96d..000000000
Binary files a/doc/gitian-building/debian_install_8_set_up_username.png and /dev/null differ
diff --git a/doc/gitian-building/debian_install_9_user_password.png b/doc/gitian-building/debian_install_9_user_password.png
deleted file mode 100644
index 981f1181d..000000000
Binary files a/doc/gitian-building/debian_install_9_user_password.png and /dev/null differ
diff --git a/doc/gitian-building/debian_root_login.png b/doc/gitian-building/debian_root_login.png
deleted file mode 100644
index 14cdd5ba5..000000000
Binary files a/doc/gitian-building/debian_root_login.png and /dev/null differ
diff --git a/doc/gitian-building/network_settings.png b/doc/gitian-building/network_settings.png
deleted file mode 100644
index 9e714fd15..000000000
Binary files a/doc/gitian-building/network_settings.png and /dev/null differ
diff --git a/doc/gitian-building/port_forwarding_rules.png b/doc/gitian-building/port_forwarding_rules.png
deleted file mode 100644
index 9e1fa2af2..000000000
Binary files a/doc/gitian-building/port_forwarding_rules.png and /dev/null differ
diff --git a/doc/gitian-building/select_startup_disk.png b/doc/gitian-building/select_startup_disk.png
deleted file mode 100644
index 59bc093e2..000000000
Binary files a/doc/gitian-building/select_startup_disk.png and /dev/null differ
diff --git a/doc/init.md b/doc/init.md
index e3db5b05e..75f9013f2 100644
--- a/doc/init.md
+++ b/doc/init.md
@@ -10,14 +10,14 @@ can be found in the contrib/init folder.
     contrib/init/bitcoind.conf:       Upstart service configuration file
     contrib/init/bitcoind.init:       CentOS compatible SysV style init script
 
-1. Service User
+Service User
 ---------------------------------
 
 All three Linux startup configurations assume the existence of a "bitcoin" user
 and group.  They must be created before attempting to use these scripts.
 The OS X configuration assumes bitcoind will be set up for the current user.
 
-2. Configuration
+Configuration
 ---------------------------------
 
 At a bare minimum, bitcoind requires that the rpcpassword setting be set
@@ -46,10 +46,10 @@ relative to the data directory. `wallet` *only* supports relative paths.
 For an example configuration file that describes the configuration settings,
 see `contrib/debian/examples/bitcoin.conf`.
 
-3. Paths
+Paths
 ---------------------------------
 
-3a) Linux
+### Linux
 
 All three configurations assume several paths that might need to be adjusted.
 
@@ -65,17 +65,17 @@ reasons to make the configuration file and data directory only readable by the
 bitcoin user and group.  Access to bitcoin-cli and other bitcoind rpc clients
 can then be controlled by group membership.
 
-3b) Mac OS X
+### Mac OS X
 
 Binary:              `/usr/local/bin/bitcoind`  
 Configuration file:  `~/Library/Application Support/Bitcoin/bitcoin.conf`  
-Data directory:      `~/Library/Application Support/Bitcoin`
-Lock file:           `~/Library/Application Support/Bitcoin/.lock`
+Data directory:      `~/Library/Application Support/Bitcoin`  
+Lock file:           `~/Library/Application Support/Bitcoin/.lock`  
 
-4. Installing Service Configuration
+Installing Service Configuration
 -----------------------------------
 
-4a) systemd
+### systemd
 
 Installing this .service file consists of just copying it to
 /usr/lib/systemd/system directory, followed by the command
@@ -84,14 +84,14 @@ Installing this .service file consists of just copying it to
 To test, run `systemctl start bitcoind` and to enable for system startup run
 `systemctl enable bitcoind`
 
-4b) OpenRC
+### OpenRC
 
 Rename bitcoind.openrc to bitcoind and drop it in /etc/init.d.  Double
 check ownership and permissions and make it executable.  Test it with
 `/etc/init.d/bitcoind start` and configure it to run on startup with
 `rc-update add bitcoind`
 
-4c) Upstart (for Debian/Ubuntu based distributions)
+### Upstart (for Debian/Ubuntu based distributions)
 
 Drop bitcoind.conf in /etc/init.  Test by running `service bitcoind start`
 it will automatically start on reboot.
@@ -99,7 +99,7 @@ it will automatically start on reboot.
 NOTE: This script is incompatible with CentOS 5 and Amazon Linux 2014 as they
 use old versions of Upstart and do not supply the start-stop-daemon utility.
 
-4d) CentOS
+### CentOS
 
 Copy bitcoind.init to /etc/init.d/bitcoind. Test by running `service bitcoind start`.
 
@@ -107,7 +107,7 @@ Using this script, you can adjust the path and flags to the bitcoind program by
 setting the BITCOIND and FLAGS environment variables in the file
 /etc/sysconfig/bitcoind. You can also use the DAEMONOPTS environment variable here.
 
-4e) Mac OS X
+### Mac OS X
 
 Copy org.bitcoin.bitcoind.plist into ~/Library/LaunchAgents. Load the launch agent by
 running `launchctl load ~/Library/LaunchAgents/org.bitcoin.bitcoind.plist`.
@@ -118,7 +118,7 @@ NOTE: This approach is intended for those wanting to run bitcoind as the current
 You will need to modify org.bitcoin.bitcoind.plist if you intend to use it as a
 Launch Daemon with a dedicated bitcoin user.
 
-5. Auto-respawn
+Auto-respawn
 -----------------------------------
 
 Auto respawning is currently only configured for Upstart and systemd.
diff --git a/doc/man/bitcoin-cli.1 b/doc/man/bitcoin-cli.1
index 0493241b1..678763844 100644
--- a/doc/man/bitcoin-cli.1
+++ b/doc/man/bitcoin-cli.1
@@ -1,9 +1,9 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.4.
-.TH BITCOIN-CLI "1" "February 2017" "bitcoin-cli v0.14.99.0" "User Commands"
+.TH BITCOIN-CLI "1" "September 2017" "bitcoin-cli v0.15.99.0" "User Commands"
 .SH NAME
-bitcoin-cli \- manual page for bitcoin-cli v0.14.99.0
+bitcoin-cli \- manual page for bitcoin-cli v0.15.99.0
 .SH DESCRIPTION
-Bitcoin Core RPC client version v0.14.99.0
+Bitcoin Core RPC client version v0.15.99.0
 .SS "Usage:"
 .TP
 bitcoin\-cli [options] <command> [params]
@@ -64,12 +64,29 @@ Password for JSON\-RPC connections
 .HP
 \fB\-rpcclienttimeout=\fR<n>
 .IP
-Timeout during HTTP requests (default: 900)
+Timeout in seconds during HTTP requests, or 0 for no timeout. (default:
+900)
+.HP
+\fB\-stdinrpcpass\fR
+.TP
+Read RPC password from standard input as a single line.
+When combined
+.IP
+with \fB\-stdin\fR, the first line from standard input is used for the
+RPC password.
 .HP
 \fB\-stdin\fR
 .IP
 Read extra arguments from standard input, one per line until EOF/Ctrl\-D
-(recommended for sensitive information such as passphrases)
+(recommended for sensitive information such as passphrases).
+When combined with \fB\-stdinrpcpass\fR, the first line from standard
+input is used for the RPC password.
+.HP
+\fB\-rpcwallet=\fR<walletname>
+.IP
+Send RPC for non\-default wallet on RPC server (argument is wallet
+filename in bitcoind directory, required if bitcoind/\-Qt runs
+with multiple wallets)
 .SH COPYRIGHT
 Copyright (C) 2009-2017 The Bitcoin Core developers
 
diff --git a/doc/man/bitcoin-qt.1 b/doc/man/bitcoin-qt.1
index ce252612e..ae35d50ac 100644
--- a/doc/man/bitcoin-qt.1
+++ b/doc/man/bitcoin-qt.1
@@ -1,9 +1,9 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.4.
-.TH BITCOIN-QT "1" "February 2017" "bitcoin-qt v0.14.99.0" "User Commands"
+.TH BITCOIN-QT "1" "September 2017" "bitcoin-qt v0.15.99.0" "User Commands"
 .SH NAME
-bitcoin-qt \- manual page for bitcoin-qt v0.14.99.0
+bitcoin-qt \- manual page for bitcoin-qt v0.15.99.0
 .SH DESCRIPTION
-Bitcoin Core version v0.14.99.0 (64\-bit)
+Bitcoin Core version v0.15.99.0 (64\-bit)
 Usage:
 .IP
 bitcoin\-qt [command\-line options]
@@ -32,9 +32,9 @@ block hash)
 If this block is in the chain assume that it and its ancestors are valid
 and potentially skip their script verification (0 to verify all,
 default:
-00000000000000000013176bf8d7dfeab4e1db31dc93bc311b436e82ab226b90,
+0000000000000000003b9ce759c2a087d52abc4266f8f4ebd6d768b89defa50a,
 testnet:
-00000000000128796ee387cf110ccb9d2f36cffaf7f73079c995377c65ac0dcc)
+0000000002e9e7b00e1f6dc5123a04aad68dd0f0968d8c7aa45f6640795c37b1)
 .HP
 \fB\-conf=\fR<file>
 .IP
@@ -46,7 +46,7 @@ Specify data directory
 .HP
 \fB\-dbcache=\fR<n>
 .IP
-Set database cache size in megabytes (4 to 16384, default: 300)
+Set database cache size in megabytes (4 to 16384, default: 450)
 .HP
 \fB\-loadblock=\fR<file>
 .IP
@@ -65,6 +65,10 @@ Keep the transaction memory pool below <n> megabytes (default: 300)
 Do not keep transactions in the mempool longer than <n> hours (default:
 336)
 .HP
+\fB\-persistmempool\fR
+.IP
+Whether to save the mempool on shutdown and load on restart (default: 1)
+.HP
 \fB\-blockreconstructionextratxn=\fR<n>
 .IP
 Extra transactions to keep in memory for compact block reconstructions
@@ -131,8 +135,8 @@ for IPv6
 .HP
 \fB\-connect=\fR<ip>
 .IP
-Connect only to the specified node(s); \fB\-noconnect\fR or \fB\-connect\fR=\fI\,0\/\fR alone to
-disable automatic connections
+Connect only to the specified node(s); \fB\-connect\fR=\fI\,0\/\fR disables automatic
+connections
 .HP
 \fB\-discover\fR
 .IP
@@ -146,7 +150,7 @@ Allow DNS lookups for \fB\-addnode\fR, \fB\-seednode\fR and \fB\-connect\fR (def
 \fB\-dnsseed\fR
 .IP
 Query for peer addresses via DNS lookup, if low on addresses (default: 1
-unless \fB\-connect\fR/\-noconnect)
+unless \fB\-connect\fR used)
 .HP
 \fB\-externalip=\fR<ip>
 .IP
@@ -158,8 +162,7 @@ Always query for peer addresses via DNS lookup (default: 0)
 .HP
 \fB\-listen\fR
 .IP
-Accept connections from outside (default: 1 if no \fB\-proxy\fR or
-\fB\-connect\fR/\-noconnect)
+Accept connections from outside (default: 1 if no \fB\-proxy\fR or \fB\-connect\fR)
 .HP
 \fB\-listenonion\fR
 .IP
@@ -214,11 +217,6 @@ Connect through SOCKS5 proxy
 Randomize credentials for every proxy connection. This enables Tor
 stream isolation (default: 1)
 .HP
-\fB\-rpcserialversion\fR
-.IP
-Sets the serialization of raw transaction or block hex returned in
-non\-verbose mode, non\-segwit(0) or segwit(1) (default: 1)
-.HP
 \fB\-seednode=\fR<ip>
 .IP
 Connect to a node to retrieve peer addresses, and disconnect
@@ -253,16 +251,6 @@ times. Whitelisted peers cannot be DoS banned and their
 transactions are always relayed, even if they are already in the
 mempool, useful e.g. for a gateway
 .HP
-\fB\-whitelistrelay\fR
-.IP
-Accept relayed transactions received from whitelisted peers even when
-not relaying transactions (default: 1)
-.HP
-\fB\-whitelistforcerelay\fR
-.IP
-Force relay of transactions from whitelisted peers even if they violate
-local relay policy (default: 1)
-.HP
 \fB\-maxuploadtarget=\fR<n>
 .IP
 Tries to keep outbound traffic under the given target (in MiB per 24h),
@@ -276,13 +264,21 @@ Do not load the wallet and disable wallet RPC calls
 .HP
 \fB\-keypool=\fR<n>
 .IP
-Set key pool size to <n> (default: 100)
+Set key pool size to <n> (default: 1000)
 .HP
 \fB\-fallbackfee=\fR<amt>
 .IP
 A fee rate (in BTC/kB) that will be used when fee estimation has
 insufficient data (default: 0.0002)
 .HP
+\fB\-discardfee=\fR<amt>
+.IP
+The fee rate (in BTC/kB) that indicates your tolerance for discarding
+change by adding it to the fee (default: 0.0001). Note: An output
+is discarded if it is dust at this rate, but we will always
+discard up to the dust relay fee and a discard fee above that is
+limited by the fee estimate for the longest target
+.HP
 \fB\-mintxfee=\fR<amt>
 .IP
 Fees (in BTC/kB) smaller than this are considered zero fee for
@@ -309,11 +305,6 @@ Spend unconfirmed change when sending transactions (default: 1)
 If paytxfee is not set, include enough fee so transactions begin
 confirmation on average within n blocks (default: 6)
 .HP
-\fB\-usehd\fR
-.IP
-Use hierarchical deterministic key generation (HD) after BIP32. Only has
-effect during wallet creation/first start (default: 1)
-.HP
 \fB\-walletrbf\fR
 .IP
 Send transactions with full\-RBF opt\-in enabled (default: 0)
@@ -370,10 +361,16 @@ Append comment to the user agent string
 .IP
 Output debugging information (default: 0, supplying <category> is
 optional). If <category> is not supplied or if <category> = 1,
-output all debugging information.<category> can be: addrman,
-alert, bench, cmpctblock, coindb, db, http, libevent, lock,
-mempool, mempoolrej, net, proxy, prune, rand, reindex, rpc,
-selectcoins, tor, zmq, qt.
+output all debugging information. <category> can be: net, tor,
+mempool, http, bench, zmq, db, rpc, estimatefee, addrman,
+selectcoins, reindex, cmpctblock, rand, prune, proxy, mempoolrej,
+libevent, coindb, qt, leveldb.
+.HP
+\fB\-debugexclude=\fR<category>
+.IP
+Exclude debugging information for a category. Can be used in conjunction
+with \fB\-debug\fR=\fI\,1\/\fR to output debug logs for all categories except one
+or more specified categories.
 .HP
 \fB\-help\-debug\fR
 .IP
@@ -387,11 +384,6 @@ Include IP addresses in debug output (default: 0)
 .IP
 Prepend debug output with timestamp (default: 1)
 .HP
-\fB\-minrelaytxfee=\fR<amt>
-.IP
-Fees (in BTC/kB) smaller than this are considered zero fee for relaying,
-mining and transaction creation (default: 0.00001)
-.HP
 \fB\-maxtxfee=\fR<amt>
 .IP
 Maximum total fees (in BTC) to use in a single wallet transaction or raw
@@ -431,21 +423,32 @@ Maximum size of data in data carrier transactions we relay and mine
 \fB\-mempoolreplacement\fR
 .IP
 Enable transaction replacement in the memory pool (default: 1)
+.HP
+\fB\-minrelaytxfee=\fR<amt>
+.IP
+Fees (in BTC/kB) smaller than this are considered zero fee for relaying,
+mining and transaction creation (default: 0.00001)
+.HP
+\fB\-whitelistrelay\fR
+.IP
+Accept relayed transactions received from whitelisted peers even when
+not relaying transactions (default: 1)
+.HP
+\fB\-whitelistforcerelay\fR
+.IP
+Force relay of transactions from whitelisted peers even if they violate
+local relay policy (default: 1)
 .PP
 Block creation options:
 .HP
 \fB\-blockmaxweight=\fR<n>
 .IP
-Set maximum BIP141 block weight (default: 3000000)
+Set maximum BIP141 block weight (default: 3996000)
 .HP
 \fB\-blockmaxsize=\fR<n>
 .IP
-Set maximum block size in bytes (default: 750000)
-.HP
-\fB\-blockprioritysize=\fR<n>
-.IP
-Set maximum size of high\-priority/low\-fee transactions in bytes
-(default: 0)
+Set maximum BIP141 block weight to this * 4. Deprecated, use
+blockmaxweight
 .HP
 \fB\-blockmintxfee=\fR<amt>
 .IP
@@ -462,11 +465,14 @@ Accept command line and JSON\-RPC commands
 .IP
 Accept public REST requests (default: 0)
 .HP
-\fB\-rpcbind=\fR<addr>
+\fB\-rpcbind=\fR<addr>[:port]
 .IP
-Bind to given address to listen for JSON\-RPC connections. Use
-[host]:port notation for IPv6. This option can be specified
-multiple times (default: bind to all interfaces)
+Bind to given address to listen for JSON\-RPC connections. This option is
+ignored unless \fB\-rpcallowip\fR is also passed. Port is optional and
+overrides \fB\-rpcport\fR. Use [host]:port notation for IPv6. This
+option can be specified multiple times (default: 127.0.0.1 and
+::1 i.e., localhost, or if \fB\-rpcallowip\fR has been specified,
+0.0.0.0 and :: i.e., all addresses)
 .HP
 \fB\-rpccookiefile=\fR<loc>
 .IP
@@ -501,6 +507,11 @@ single IP (e.g. 1.2.3.4), a network/netmask (e.g.
 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. 1.2.3.4/24). This
 option can be specified multiple times
 .HP
+\fB\-rpcserialversion\fR
+.IP
+Sets the serialization of raw transaction or block hex returned in
+non\-verbose mode, non\-segwit(0) or segwit(1) (default: 1)
+.HP
 \fB\-rpcthreads=\fR<n>
 .IP
 Set the number of threads to service RPC calls (default: 4)
diff --git a/doc/man/bitcoin-tx.1 b/doc/man/bitcoin-tx.1
index 98adf2f5b..8b72fbde0 100644
--- a/doc/man/bitcoin-tx.1
+++ b/doc/man/bitcoin-tx.1
@@ -1,9 +1,9 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.4.
-.TH BITCOIN-TX "1" "February 2017" "bitcoin-tx v0.14.99.0" "User Commands"
+.TH BITCOIN-TX "1" "September 2017" "bitcoin-tx v0.15.99.0" "User Commands"
 .SH NAME
-bitcoin-tx \- manual page for bitcoin-tx v0.14.99.0
+bitcoin-tx \- manual page for bitcoin-tx v0.15.99.0
 .SH DESCRIPTION
-Bitcoin Core bitcoin\-tx utility version v0.14.99.0
+Bitcoin Core bitcoin\-tx utility version v0.15.99.0
 .SS "Usage:"
 .TP
 bitcoin\-tx [options] <hex\-tx> [commands]
@@ -63,6 +63,11 @@ nversion=N
 .IP
 Set TX version to N
 .IP
+replaceable(=N)
+.IP
+Set RBF opt\-in sequence number for input N (if not provided, opt\-in all
+available inputs)
+.IP
 outaddr=VALUE:ADDRESS
 .IP
 Add address\-based output to TX
diff --git a/doc/man/bitcoind.1 b/doc/man/bitcoind.1
index fb066e0c6..baf747436 100644
--- a/doc/man/bitcoind.1
+++ b/doc/man/bitcoind.1
@@ -1,9 +1,9 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.4.
-.TH BITCOIND "1" "February 2017" "bitcoind v0.14.99.0" "User Commands"
+.TH BITCOIND "1" "September 2017" "bitcoind v0.15.99.0" "User Commands"
 .SH NAME
-bitcoind \- manual page for bitcoind v0.14.99.0
+bitcoind \- manual page for bitcoind v0.15.99.0
 .SH DESCRIPTION
-Bitcoin Core Daemon version v0.14.99.0
+Bitcoin Core Daemon version v0.15.99.0
 .SS "Usage:"
 .TP
 bitcoind [options]
@@ -33,9 +33,9 @@ block hash)
 If this block is in the chain assume that it and its ancestors are valid
 and potentially skip their script verification (0 to verify all,
 default:
-00000000000000000013176bf8d7dfeab4e1db31dc93bc311b436e82ab226b90,
+0000000000000000003b9ce759c2a087d52abc4266f8f4ebd6d768b89defa50a,
 testnet:
-00000000000128796ee387cf110ccb9d2f36cffaf7f73079c995377c65ac0dcc)
+0000000002e9e7b00e1f6dc5123a04aad68dd0f0968d8c7aa45f6640795c37b1)
 .HP
 \fB\-conf=\fR<file>
 .IP
@@ -51,7 +51,7 @@ Specify data directory
 .HP
 \fB\-dbcache=\fR<n>
 .IP
-Set database cache size in megabytes (4 to 16384, default: 300)
+Set database cache size in megabytes (4 to 16384, default: 450)
 .HP
 \fB\-loadblock=\fR<file>
 .IP
@@ -70,6 +70,10 @@ Keep the transaction memory pool below <n> megabytes (default: 300)
 Do not keep transactions in the mempool longer than <n> hours (default:
 336)
 .HP
+\fB\-persistmempool\fR
+.IP
+Whether to save the mempool on shutdown and load on restart (default: 1)
+.HP
 \fB\-blockreconstructionextratxn=\fR<n>
 .IP
 Extra transactions to keep in memory for compact block reconstructions
@@ -136,8 +140,8 @@ for IPv6
 .HP
 \fB\-connect=\fR<ip>
 .IP
-Connect only to the specified node(s); \fB\-noconnect\fR or \fB\-connect\fR=\fI\,0\/\fR alone to
-disable automatic connections
+Connect only to the specified node(s); \fB\-connect\fR=\fI\,0\/\fR disables automatic
+connections
 .HP
 \fB\-discover\fR
 .IP
@@ -151,7 +155,7 @@ Allow DNS lookups for \fB\-addnode\fR, \fB\-seednode\fR and \fB\-connect\fR (def
 \fB\-dnsseed\fR
 .IP
 Query for peer addresses via DNS lookup, if low on addresses (default: 1
-unless \fB\-connect\fR/\-noconnect)
+unless \fB\-connect\fR used)
 .HP
 \fB\-externalip=\fR<ip>
 .IP
@@ -163,8 +167,7 @@ Always query for peer addresses via DNS lookup (default: 0)
 .HP
 \fB\-listen\fR
 .IP
-Accept connections from outside (default: 1 if no \fB\-proxy\fR or
-\fB\-connect\fR/\-noconnect)
+Accept connections from outside (default: 1 if no \fB\-proxy\fR or \fB\-connect\fR)
 .HP
 \fB\-listenonion\fR
 .IP
@@ -219,11 +222,6 @@ Connect through SOCKS5 proxy
 Randomize credentials for every proxy connection. This enables Tor
 stream isolation (default: 1)
 .HP
-\fB\-rpcserialversion\fR
-.IP
-Sets the serialization of raw transaction or block hex returned in
-non\-verbose mode, non\-segwit(0) or segwit(1) (default: 1)
-.HP
 \fB\-seednode=\fR<ip>
 .IP
 Connect to a node to retrieve peer addresses, and disconnect
@@ -258,16 +256,6 @@ times. Whitelisted peers cannot be DoS banned and their
 transactions are always relayed, even if they are already in the
 mempool, useful e.g. for a gateway
 .HP
-\fB\-whitelistrelay\fR
-.IP
-Accept relayed transactions received from whitelisted peers even when
-not relaying transactions (default: 1)
-.HP
-\fB\-whitelistforcerelay\fR
-.IP
-Force relay of transactions from whitelisted peers even if they violate
-local relay policy (default: 1)
-.HP
 \fB\-maxuploadtarget=\fR<n>
 .IP
 Tries to keep outbound traffic under the given target (in MiB per 24h),
@@ -281,13 +269,21 @@ Do not load the wallet and disable wallet RPC calls
 .HP
 \fB\-keypool=\fR<n>
 .IP
-Set key pool size to <n> (default: 100)
+Set key pool size to <n> (default: 1000)
 .HP
 \fB\-fallbackfee=\fR<amt>
 .IP
 A fee rate (in BTC/kB) that will be used when fee estimation has
 insufficient data (default: 0.0002)
 .HP
+\fB\-discardfee=\fR<amt>
+.IP
+The fee rate (in BTC/kB) that indicates your tolerance for discarding
+change by adding it to the fee (default: 0.0001). Note: An output
+is discarded if it is dust at this rate, but we will always
+discard up to the dust relay fee and a discard fee above that is
+limited by the fee estimate for the longest target
+.HP
 \fB\-mintxfee=\fR<amt>
 .IP
 Fees (in BTC/kB) smaller than this are considered zero fee for
@@ -314,11 +310,6 @@ Spend unconfirmed change when sending transactions (default: 1)
 If paytxfee is not set, include enough fee so transactions begin
 confirmation on average within n blocks (default: 6)
 .HP
-\fB\-usehd\fR
-.IP
-Use hierarchical deterministic key generation (HD) after BIP32. Only has
-effect during wallet creation/first start (default: 1)
-.HP
 \fB\-walletrbf\fR
 .IP
 Send transactions with full\-RBF opt\-in enabled (default: 0)
@@ -375,10 +366,16 @@ Append comment to the user agent string
 .IP
 Output debugging information (default: 0, supplying <category> is
 optional). If <category> is not supplied or if <category> = 1,
-output all debugging information.<category> can be: addrman,
-alert, bench, cmpctblock, coindb, db, http, libevent, lock,
-mempool, mempoolrej, net, proxy, prune, rand, reindex, rpc,
-selectcoins, tor, zmq.
+output all debugging information. <category> can be: net, tor,
+mempool, http, bench, zmq, db, rpc, estimatefee, addrman,
+selectcoins, reindex, cmpctblock, rand, prune, proxy, mempoolrej,
+libevent, coindb, qt, leveldb.
+.HP
+\fB\-debugexclude=\fR<category>
+.IP
+Exclude debugging information for a category. Can be used in conjunction
+with \fB\-debug\fR=\fI\,1\/\fR to output debug logs for all categories except one
+or more specified categories.
 .HP
 \fB\-help\-debug\fR
 .IP
@@ -392,11 +389,6 @@ Include IP addresses in debug output (default: 0)
 .IP
 Prepend debug output with timestamp (default: 1)
 .HP
-\fB\-minrelaytxfee=\fR<amt>
-.IP
-Fees (in BTC/kB) smaller than this are considered zero fee for relaying,
-mining and transaction creation (default: 0.00001)
-.HP
 \fB\-maxtxfee=\fR<amt>
 .IP
 Maximum total fees (in BTC) to use in a single wallet transaction or raw
@@ -436,21 +428,32 @@ Maximum size of data in data carrier transactions we relay and mine
 \fB\-mempoolreplacement\fR
 .IP
 Enable transaction replacement in the memory pool (default: 1)
+.HP
+\fB\-minrelaytxfee=\fR<amt>
+.IP
+Fees (in BTC/kB) smaller than this are considered zero fee for relaying,
+mining and transaction creation (default: 0.00001)
+.HP
+\fB\-whitelistrelay\fR
+.IP
+Accept relayed transactions received from whitelisted peers even when
+not relaying transactions (default: 1)
+.HP
+\fB\-whitelistforcerelay\fR
+.IP
+Force relay of transactions from whitelisted peers even if they violate
+local relay policy (default: 1)
 .PP
 Block creation options:
 .HP
 \fB\-blockmaxweight=\fR<n>
 .IP
-Set maximum BIP141 block weight (default: 3000000)
+Set maximum BIP141 block weight (default: 3996000)
 .HP
 \fB\-blockmaxsize=\fR<n>
 .IP
-Set maximum block size in bytes (default: 750000)
-.HP
-\fB\-blockprioritysize=\fR<n>
-.IP
-Set maximum size of high\-priority/low\-fee transactions in bytes
-(default: 0)
+Set maximum BIP141 block weight to this * 4. Deprecated, use
+blockmaxweight
 .HP
 \fB\-blockmintxfee=\fR<amt>
 .IP
@@ -467,11 +470,14 @@ Accept command line and JSON\-RPC commands
 .IP
 Accept public REST requests (default: 0)
 .HP
-\fB\-rpcbind=\fR<addr>
+\fB\-rpcbind=\fR<addr>[:port]
 .IP
-Bind to given address to listen for JSON\-RPC connections. Use
-[host]:port notation for IPv6. This option can be specified
-multiple times (default: bind to all interfaces)
+Bind to given address to listen for JSON\-RPC connections. This option is
+ignored unless \fB\-rpcallowip\fR is also passed. Port is optional and
+overrides \fB\-rpcport\fR. Use [host]:port notation for IPv6. This
+option can be specified multiple times (default: 127.0.0.1 and
+::1 i.e., localhost, or if \fB\-rpcallowip\fR has been specified,
+0.0.0.0 and :: i.e., all addresses)
 .HP
 \fB\-rpccookiefile=\fR<loc>
 .IP
@@ -506,6 +512,11 @@ single IP (e.g. 1.2.3.4), a network/netmask (e.g.
 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. 1.2.3.4/24). This
 option can be specified multiple times
 .HP
+\fB\-rpcserialversion\fR
+.IP
+Sets the serialization of raw transaction or block hex returned in
+non\-verbose mode, non\-segwit(0) or segwit(1) (default: 1)
+.HP
 \fB\-rpcthreads=\fR<n>
 .IP
 Set the number of threads to service RPC calls (default: 4)
diff --git a/doc/release-notes.md b/doc/release-notes.md
index a13ede2dd..4ecca7897 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -8,7 +8,7 @@ Bitcoin Core version *version* is now available from:
 This is a new major version release, including new features, various bugfixes
 and performance improvements, as well as updated translations.
 
-Please report bugs using the issue tracker at github:
+Please report bugs using the issue tracker at GitHub:
 
   <https://github.com/bitcoin/bitcoin/issues>
 
@@ -16,16 +16,39 @@ To receive security and update notifications, please subscribe to:
 
   <https://bitcoincore.org/en/list/announcements/join/>
 
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes for older versions), then run the 
+installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on Mac)
+or `bitcoind`/`bitcoin-qt` (on Linux).
+
+The first time you run version 0.15.0, your chainstate database will be converted to a
+new format, which will take anywhere from a few minutes to half an hour,
+depending on the speed of your machine.
+
+Note that the block database format also changed in version 0.8.0 and there is no
+automatic upgrade code from before version 0.8 to version 0.15.0. Upgrading
+directly from 0.7.x and earlier without redownloading the blockchain is not supported.
+However, as usual, old wallet versions are still supported.
+
+Downgrading warning
+-------------------
+
+The chainstate database for this release is not compatible with previous
+releases, so if you run 0.15 and then decide to switch back to any
+older version, you will need to run the old release with the `-reindex-chainstate`
+option to rebuild the chainstate data structures in the old format.
+
+If your node has pruning enabled, this will entail re-downloading and
+processing the entire blockchain.
+
 Compatibility
 ==============
 
 Bitcoin Core is extensively tested on multiple operating systems using
-the Linux kernel, macOS 10.8+, and Windows Vista and later.
-
-Microsoft ended support for Windows XP on [April 8th, 2014](https://www.microsoft.com/en-us/WindowsForBusiness/end-of-xp-support).
-No attempt is made to prevent installing or running the software on Windows XP, you
-can still do so at your own risk but be aware that there are known instabilities.
-Please do not report issues about Windows XP to the issue tracker.
+the Linux kernel, macOS 10.8+, and Windows Vista and later. Windows XP is not supported.
 
 Bitcoin Core should also work on most other Unix-like systems but is not
 frequently tested on them.
@@ -33,69 +56,35 @@ frequently tested on them.
 Notable changes
 ===============
 
-Low-level RPC changes
+Miner block size limiting deprecated
+------------------------------------
+
+Though blockmaxweight has been preferred for limiting the size of blocks returned by
+getblocktemplate since 0.13.0, blockmaxsize remained as an option for those who wished
+to limit their block size directly. Using this option resulted in a few UI issues as
+well as non-optimal fee selection and ever-so-slightly worse performance, and has thus
+now been deprecated. Further, the blockmaxsize option is now used only to calculate an
+implied blockmaxweight, instead of limiting block size directly. Any miners who wish
+to limit their blocks by size, instead of by weight, will have to do so manually by
+removing transactions from their block template directly.
+
+HD-wallets by default
 ---------------------
+Due to a backward-incompatible change in the wallet database, wallets created
+with version 0.16.0 will be rejected by previous versions. Also, version 0.16.0
+will only create hierarchical deterministic (HD) wallets.
 
-- The new database model no longer stores information about transaction
-  versions of unspent outputs. This means that:
-  - The `gettxout` RPC no longer has a `version` field in the response.
-  - The `gettxoutsetinfo` RPC reports `hash_serialized_2` instead of `hash_serialized`,
-    which does not commit to the transaction versions of unspent outputs, but does
-    commit to the height and coinbase information.
-  - The `gettxoutsetinfo` response now contains `disk_size` and `bogosize` instead of
-    `bytes_serialized`. The first is a more accurate estimate of actual disk usage, but
-    is not deterministic. The second is unrelated to disk usage, but is a
-    database-independent metric of UTXO set size: it counts every UTXO entry as 50 + the
-    length of its scriptPubKey.
-  - The `getutxos` REST path no longer reports the `txvers` field in JSON format,
-    and always reports 0 for transaction versions in the binary format
-
-
-- Error codes have been updated to be more accurate for the following error cases:
-  - `getblock` now returns RPC_MISC_ERROR if the block can't be found on disk (for
-  example if the block has been pruned). Previously returned RPC_INTERNAL_ERROR.
-  - `pruneblockchain` now returns RPC_MISC_ERROR if the blocks cannot be pruned
-  because the node is not in pruned mode. Previously returned RPC_METHOD_NOT_FOUND.
-  - `pruneblockchain` now returns RPC_INVALID_PARAMETER if the blocks cannot be pruned
-  because the supplied timestamp is too late. Previously returned RPC_INTERNAL_ERROR.
-  - `pruneblockchain` now returns RPC_MISC_ERROR if the blocks cannot be pruned
-  because the blockchain is too short. Previously returned RPC_INTERNAL_ERROR.
-  - `setban` now returns RPC_CLIENT_INVALID_IP_OR_SUBNET if the supplied IP address
-  or subnet is invalid. Previously returned RPC_CLIENT_NODE_ALREADY_ADDED.
-  - `setban` now returns RPC_CLIENT_INVALID_IP_OR_SUBNET if the user tries to unban
-  a node that has not previously been banned. Previously returned RPC_MISC_ERROR.
-  - `removeprunedfunds` now returns RPC_WALLET_ERROR if bitcoind is unable to remove
-  the transaction. Previously returned RPC_INTERNAL_ERROR.
-  - `removeprunedfunds` now returns RPC_INVALID_PARAMETER if the transaction does not
-  exist in the wallet. Previously returned RPC_INTERNAL_ERROR.
-  - `fundrawtransaction` now returns RPC_INVALID_ADDRESS_OR_KEY if an invalid change
-  address is provided. Previously returned RPC_INVALID_PARAMETER.
-  - `fundrawtransaction` now returns RPC_WALLET_ERROR if bitcoind is unable to create
-  the transaction. The error message provides further details. Previously returned
-  RPC_INTERNAL_ERROR.
-  - `bumpfee` now returns RPC_INVALID_PARAMETER if the provided transaction has
-  descendants in the wallet. Previously returned RPC_MISC_ERROR.
-  - `bumpfee` now returns RPC_INVALID_PARAMETER if the provided transaction has
-  descendants in the mempool. Previously returned RPC_MISC_ERROR.
-  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction has
-  has been mined or conflicts with a mined transaction. Previously returned
-  RPC_INVALID_ADDRESS_OR_KEY.
-  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction is not
-  BIP 125 replaceable. Previously returned RPC_INVALID_ADDRESS_OR_KEY.
-  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction has already
-  been bumped by a different transaction. Previously returned RPC_INVALID_REQUEST.
-  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction contains
-  inputs which don't belong to this wallet. Previously returned RPC_INVALID_ADDRESS_OR_KEY.
-  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction has multiple change
-  outputs. Previously returned RPC_MISC_ERROR.
-  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction has no change
-  output. Previously returned RPC_MISC_ERROR.
-  - `bumpfee` now returns RPC_WALLET_ERROR if the fee is too high. Previously returned
-  RPC_MISC_ERROR.
-  - `bumpfee` now returns RPC_WALLET_ERROR if the fee is too low. Previously returned
-  RPC_MISC_ERROR.
-  - `bumpfee` now returns RPC_WALLET_ERROR if the change output is too small to bump the
-  fee. Previously returned RPC_MISC_ERROR.
+Low-level RPC changes
+----------------------
+- The "currentblocksize" value in getmininginfo has been removed.
+- The deprecated RPC `getinfo` was removed. It is recommended that the more specific RPCs are used:
+  * `getblockchaininfo`
+  * `getnetworkinfo`
+  * `getwalletinfo`
+  * `getmininginfo`
+
+- `dumpwallet` no longer allows overwriting files. This is a security measure
+  as well as prevents dangerous user mistakes.
 
 Credits
 =======
diff --git a/doc/release-notes/release-notes-0.15.0.1.md b/doc/release-notes/release-notes-0.15.0.1.md
new file mode 100644
index 000000000..53ab02cbb
--- /dev/null
+++ b/doc/release-notes/release-notes-0.15.0.1.md
@@ -0,0 +1,87 @@
+Bitcoin Core version *0.15.0.1* is now available from:
+
+  <https://bitcoin.org/bin/bitcoin-core-0.15.0.1/>
+
+and
+
+  <https://bitcoincore.org/bin/bitcoin-core-0.15.0.1/>
+
+This is a minor bug fix for 0.15.0.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes for older versions), then run the 
+installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on Mac)
+or `bitcoind`/`bitcoin-qt` (on Linux).
+
+The first time you run version 0.15.0 or higher, your chainstate database will
+be converted to a new format, which will take anywhere from a few minutes to
+half an hour, depending on the speed of your machine.
+
+The file format of `fee_estimates.dat` changed in version 0.15.0. Hence, a
+downgrade from version 0.15.0 or upgrade to version 0.15.0 will cause all fee
+estimates to be discarded.
+
+Note that the block database format also changed in version 0.8.0 and there is no
+automatic upgrade code from before version 0.8 to version 0.15.0. Upgrading
+directly from 0.7.x and earlier without redownloading the blockchain is not supported.
+However, as usual, old wallet versions are still supported.
+
+Downgrading warning
+-------------------
+
+The chainstate database for this release is not compatible with previous
+releases, so if you run 0.15 and then decide to switch back to any
+older version, you will need to run the old release with the `-reindex-chainstate`
+option to rebuild the chainstate data structures in the old format.
+
+If your node has pruning enabled, this will entail re-downloading and
+processing the entire blockchain.
+
+Compatibility
+==============
+
+Bitcoin Core is extensively tested on multiple operating systems using
+the Linux kernel, macOS 10.8+, and Windows Vista and later. Windows XP is not supported.
+
+Bitcoin Core should also work on most other Unix-like systems but is not
+frequently tested on them.
+
+Notable changes
+===============
+
+GUI startup crash issue
+-------------------------
+
+After upgrade to 0.15.0, some clients would crash at startup because a custom
+fee setting was configured that no longer exists in the GUI. This is a minimal
+patch to avoid this issue from occuring.
+
+0.15.0.1 Change log
+====================
+
+-  #11332 `46c8d23` Fix possible crash with invalid nCustomFeeRadio in QSettings (achow101, TheBlueMatt)
+
+Also the manpages were updated, as this was forgotten for 0.15.0.
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- Andrew Chow
+- Matt Corallo
+- Jonas Schnelli
+- Wladimir J. van der Laan
+
+As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/).
diff --git a/doc/release-notes/release-notes-0.15.0.md b/doc/release-notes/release-notes-0.15.0.md
new file mode 100644
index 000000000..29816cacf
--- /dev/null
+++ b/doc/release-notes/release-notes-0.15.0.md
@@ -0,0 +1,878 @@
+Bitcoin Core version *0.15.0* is now available from:
+
+  <https://bitcoin.org/bin/bitcoin-core-0.15.0/>
+
+This is a new major version release, including new features, various bugfixes
+and performance improvements, as well as updated translations.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes for older versions), then run the 
+installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on Mac)
+or `bitcoind`/`bitcoin-qt` (on Linux).
+
+The first time you run version 0.15.0, your chainstate database will be converted to a
+new format, which will take anywhere from a few minutes to half an hour,
+depending on the speed of your machine.
+
+The file format of `fee_estimates.dat` changed in version 0.15.0. Hence, a
+downgrade from version 0.15.0 or upgrade to version 0.15.0 will cause all fee
+estimates to be discarded.
+
+Note that the block database format also changed in version 0.8.0 and there is no
+automatic upgrade code from before version 0.8 to version 0.15.0. Upgrading
+directly from 0.7.x and earlier without redownloading the blockchain is not supported.
+However, as usual, old wallet versions are still supported.
+
+Downgrading warning
+-------------------
+
+The chainstate database for this release is not compatible with previous
+releases, so if you run 0.15 and then decide to switch back to any
+older version, you will need to run the old release with the `-reindex-chainstate`
+option to rebuild the chainstate data structures in the old format.
+
+If your node has pruning enabled, this will entail re-downloading and
+processing the entire blockchain.
+
+Compatibility
+==============
+
+Bitcoin Core is extensively tested on multiple operating systems using
+the Linux kernel, macOS 10.8+, and Windows Vista and later. Windows XP is not supported.
+
+Bitcoin Core should also work on most other Unix-like systems but is not
+frequently tested on them.
+
+Notes for 0.15.0
+================
+
+Current SegWit support
+----------------------
+
+Version 0.15.0 supports adding a segregated witness address via the `addwitnessaddress` RPC, but
+please note that this is a testing/expert RPC, which does not guarantee recovery from backup. Only use
+this RPC if you know what you are doing. More complete wallet support for segregated witness is coming
+in a next version.
+
+Rescanning with encrypted wallets
+---------------------------------
+
+As in previous versions, when using an encrypted HD wallet, the keypool cannot be topped up without unlocking
+the wallet. This means that currently, in order to recover from a backup of an encrypted HD wallet, the user
+must unlock the wallet with a really long timeout and manually trigger a rescan, otherwise they risk missing
+some keys when auto-topup cannot run. Unfortunately there is no `rescan` RPC in this version, that will be
+included in a future version, so for now a rescan can be triggered using one of the `import*` commands, using
+a dummy address generated by another (trusted) wallet.
+
+Notable changes
+===============
+
+Performance Improvements
+------------------------
+
+Version 0.15 contains a number of significant performance improvements, which make
+Initial Block Download, startup, transaction and block validation much faster:
+
+- The chainstate database (which is used for tracking UTXOs) has been changed
+  from a per-transaction model to a per-output model (See [PR 10195](https://github.com/bitcoin/bitcoin/pull/10195)). Advantages of this model
+  are that it:
+    - avoids the CPU overhead of deserializing and serializing the unused outputs;
+    - has more predictable memory usage;
+    - uses simpler code;
+    - is adaptable to various future cache flushing strategies.
+
+  As a result, validating the blockchain during Initial Block Download (IBD) and reindex
+  is ~30-40% faster, uses 10-20% less memory, and flushes to disk far less frequently.
+  The only downside is that the on-disk database is 15% larger. During the conversion from the previous format
+  a few extra gigabytes may be used.
+- Earlier versions experienced a spike in memory usage while flushing UTXO updates to disk.
+  As a result, only half of the available memory was actually used as cache, and the other half was
+  reserved to accommodate flushing. This is no longer the case (See [PR 10148](https://github.com/bitcoin/bitcoin/pull/10148)), and the entirety of
+  the available cache (see `-dbcache`) is now actually used as cache. This reduces the flushing
+  frequency by a factor 2 or more.
+- In previous versions, signature validation for transactions has been cached when the
+  transaction is accepted to the mempool. Version 0.15 extends this to cache the entire script
+  validity (See [PR 10192](https://github.com/bitcoin/bitcoin/pull/10192)). This means that if a transaction in a block has already been accepted to the
+  mempool, the scriptSig does not need to be re-evaluated. Empirical tests show that
+  this results in new block validation being 40-50% faster.
+- LevelDB has been upgraded to version 1.20 (See [PR 10544](https://github.com/bitcoin/bitcoin/pull/10544)). This version contains hardware acceleration for CRC
+  on architectures supporting SSE 4.2. As a result, synchronization and block validation are now faster.
+- SHA256 hashing has been optimized for architectures supporting SSE 4 (See [PR 10821](https://github.com/bitcoin/bitcoin/pull/10821)). SHA256 is around
+  50% faster on supported hardware, which results in around 5% faster IBD and block
+  validation. In version 0.15, SHA256 hardware optimization is disabled in release builds by
+  default, but can be enabled by using `--enable-experimental-asm` when building.
+- Refill of the keypool no longer flushes the wallet between each key which resulted in a ~20x speedup in creating a new wallet. Part of this speedup was used to increase the default keypool to 1000 keys to make recovery more robust. (See [PR 10831](https://github.com/bitcoin/bitcoin/pull/10831)).
+
+Fee Estimation Improvements
+---------------------------
+
+Fee estimation has been significantly improved in version 0.15, with more accurate fee estimates used by the wallet and a wider range of options for advanced users of the `estimatesmartfee` and `estimaterawfee` RPCs (See [PR 10199](https://github.com/bitcoin/bitcoin/pull/10199)).
+
+### Changes to internal logic and wallet behavior
+
+- Internally, estimates are now tracked on 3 different time horizons. This allows for longer targets and means estimates adjust more quickly to changes in conditions.
+- Estimates can now be *conservative* or *economical*. *Conservative* estimates use longer time horizons to produce an estimate which is less susceptible to rapid changes in fee conditions. *Economical* estimates use shorter time horizons and will be more affected by short-term changes in fee conditions. Economical estimates may be considerably lower during periods of low transaction activity (for example over weekends), but may result in transactions being unconfirmed if prevailing fees increase rapidly.
+- By default, the wallet will use conservative fee estimates to increase the reliability of transactions being confirmed within the desired target. For transactions that are marked as replaceable, the wallet will use an economical estimate by default, since the fee can be 'bumped' if the fee conditions change rapidly (See [PR 10589](https://github.com/bitcoin/bitcoin/pull/10589)).
+- Estimates can now be made for confirmation targets up to 1008 blocks (one week).
+- More data on historical fee rates is stored, leading to more precise fee estimates.
+- Transactions which leave the mempool due to eviction or other non-confirmed reasons are now taken into account by the fee estimation logic, leading to more accurate fee estimates.
+- The fee estimation logic will make sure enough data has been gathered to return a meaningful estimate. If there is insufficient data, a fallback default fee is used.
+
+### Changes to fee estimate RPCs
+
+- The `estimatefee` RPC is now deprecated in favor of using only `estimatesmartfee` (which is the implementation used by the GUI)
+- The `estimatesmartfee` RPC interface has been changed (See [PR 10707](https://github.com/bitcoin/bitcoin/pull/10707)):
+    - The `nblocks` argument has been renamed to `conf_target` (to be consistent with other RPC methods).
+    - An `estimate_mode` argument has been added. This argument takes one of the following strings: `CONSERVATIVE`, `ECONOMICAL` or `UNSET` (which defaults to `CONSERVATIVE`).
+    - The RPC return object now contains an `errors` member, which returns errors encountered during processing.
+    - If Bitcoin Core has not been running for long enough and has not seen enough blocks or transactions to produce an accurate fee estimation, an error will be returned (previously a value of -1 was used to indicate an error, which could be confused for a feerate).
+- A new `estimaterawfee` RPC is added to provide raw fee data. External clients can query and use this data in their own fee estimation logic.
+
+Multi-wallet support
+--------------------
+
+Bitcoin Core now supports loading multiple, separate wallets (See [PR 8694](https://github.com/bitcoin/bitcoin/pull/8694), [PR 10849](https://github.com/bitcoin/bitcoin/pull/10849)). The wallets are completely separated, with individual balances, keys and received transactions.
+
+Multi-wallet is enabled by using more than one `-wallet` argument when starting Bitcoin, either on the command line or in the Bitcoin config file.
+
+**In Bitcoin-Qt, only the first wallet will be displayed and accessible for creating and signing transactions.** GUI selectable multiple wallets will be supported in a future version. However, even in 0.15 other loaded wallets will remain synchronized to the node's current tip in the background. This can be useful if running a pruned node, since loading a wallet where the most recent sync is beyond the pruned height results in having to download and revalidate the whole blockchain. Continuing to synchronize all wallets in the background avoids this problem.
+
+Bitcoin Core 0.15.0 contains the following changes to the RPC interface and `bitcoin-cli` for multi-wallet:
+
+* When running Bitcoin Core with a single wallet, there are **no** changes to the RPC interface or `bitcoin-cli`. All RPC calls and `bitcoin-cli` commands continue to work as before.
+* When running Bitcoin Core with multi-wallet, all *node-level* RPC methods continue to work as before. HTTP RPC requests should be send to the normal `<RPC IP address>:<RPC port>/` endpoint, and `bitcoin-cli` commands should be run as before. A *node-level* RPC method is any method which does not require access to the wallet.
+* When running Bitcoin Core with multi-wallet, *wallet-level* RPC methods must specify the wallet for which they're intended in every request. HTTP RPC requests should be send to the `<RPC IP address>:<RPC port>/wallet/<wallet name>/` endpoint, for example `127.0.0.1:8332/wallet/wallet1.dat/`. `bitcoin-cli` commands should be run with a `-rpcwallet` option, for example `bitcoin-cli -rpcwallet=wallet1.dat getbalance`.
+* A new *node-level* `listwallets` RPC method is added to display which wallets are currently loaded. The names returned by this method are the same as those used in the HTTP endpoint and for the `rpcwallet` argument.
+
+Note that while multi-wallet is now fully supported, the RPC multi-wallet interface should be considered unstable for version 0.15.0, and there may backwards-incompatible changes in future versions.
+
+Replace-by-fee control in the GUI
+---------------------------------
+
+Bitcoin Core has supported creating opt-in replace-by-fee (RBF) transactions
+since version 0.12.0, and since version 0.14.0 has included a `bumpfee` RPC method to
+replace unconfirmed opt-in RBF transactions with a new transaction that pays
+a higher fee.
+
+In version 0.15, creating an opt-in RBF transaction and replacing the unconfirmed
+transaction with a higher-fee transaction are both supported in the GUI (See [PR 9592](https://github.com/bitcoin/bitcoin/pull/9592)).
+
+Removal of Coin Age Priority
+----------------------------
+
+In previous versions of Bitcoin Core, a portion of each block could be reserved for transactions based on the age and value of UTXOs they spent. This concept (Coin Age Priority) is a policy choice by miners, and there are no consensus rules around the inclusion of Coin Age Priority transactions in blocks. In practice, only a few miners continue to use Coin Age Priority for transaction selection in blocks. Bitcoin Core 0.15 removes all remaining support for Coin Age Priority (See [PR 9602](https://github.com/bitcoin/bitcoin/pull/9602)). This has the following implications:
+
+- The concept of *free transactions* has been removed. High Coin Age Priority transactions would previously be allowed to be relayed even if they didn't attach a miner fee. This is no longer possible since there is no concept of Coin Age Priority. The `-limitfreerelay` and `-relaypriority` options which controlled relay of free transactions have therefore been removed.
+- The `-sendfreetransactions` option has been removed, since almost all miners do not include transactions which do not attach a transaction fee.
+- The `-blockprioritysize` option has been removed.
+- The `estimatepriority` and `estimatesmartpriority` RPCs have been removed.
+- The `getmempoolancestors`, `getmempooldescendants`, `getmempoolentry` and `getrawmempool` RPCs no longer return `startingpriority` and `currentpriority`.
+- The `prioritisetransaction` RPC no longer takes a `priority_delta` argument, which is replaced by a `dummy` argument for backwards compatibility with clients using positional arguments. The RPC is still used to change the apparent fee-rate of the transaction by using the `fee_delta` argument.
+- `-minrelaytxfee` can now be set to 0. If `minrelaytxfee` is set, then fees smaller than `minrelaytxfee` (per kB) are rejected from relaying, mining and transaction creation. This defaults to 1000 satoshi/kB.
+- The `-printpriority` option has been updated to only output the fee rate and hash of transactions included in a block by the mining code.
+
+Mempool Persistence Across Restarts
+-----------------------------------
+
+Version 0.14 introduced mempool persistence across restarts (the mempool is saved to a `mempool.dat` file in the data directory prior to shutdown and restores the mempool when the node is restarted). Version 0.15 allows this feature to be switched on or off using the `-persistmempool` command-line option (See [PR 9966](https://github.com/bitcoin/bitcoin/pull/9966)). By default, the option is set to true, and the mempool is saved on shutdown and reloaded on startup. If set to false, the `mempool.dat` file will not be loaded on startup or saved on shutdown.
+
+New RPC methods
+---------------
+
+Version 0.15 introduces several new RPC methods:
+
+- `abortrescan` stops current wallet rescan, e.g. when triggered by an `importprivkey` call (See [PR 10208](https://github.com/bitcoin/bitcoin/pull/10208)).
+- `combinerawtransaction` accepts a JSON array of raw transactions and combines them into a single raw transaction (See [PR 10571](https://github.com/bitcoin/bitcoin/pull/10571)).
+- `estimaterawfee` returns raw fee data so that customized logic can be implemented to analyze the data and calculate estimates. See [Fee Estimation Improvements](#fee-estimation-improvements) for full details on changes to the fee estimation logic and interface.
+- `getchaintxstats` returns statistics about the total number and rate of transactions
+  in the chain (See [PR 9733](https://github.com/bitcoin/bitcoin/pull/9733)).
+- `listwallets` lists wallets which are currently loaded. See the *Multi-wallet* section
+  of these release notes for full details (See [Multi-wallet support](#multi-wallet-support)).
+- `uptime` returns the total runtime of the `bitcoind` server since its last start (See [PR 10400](https://github.com/bitcoin/bitcoin/pull/10400)).
+
+Low-level RPC changes
+---------------------
+
+- When using Bitcoin Core in multi-wallet mode, RPC requests for wallet methods must specify
+  the wallet that they're intended for. See [Multi-wallet support](#multi-wallet-support) for full details.
+
+- The new database model no longer stores information about transaction
+  versions of unspent outputs (See [Performance improvements](#performance-improvements)). This means that:
+  - The `gettxout` RPC no longer has a `version` field in the response.
+  - The `gettxoutsetinfo` RPC reports `hash_serialized_2` instead of `hash_serialized`,
+    which does not commit to the transaction versions of unspent outputs, but does
+    commit to the height and coinbase information.
+  - The `getutxos` REST path no longer reports the `txvers` field in JSON format,
+    and always reports 0 for transaction versions in the binary format
+
+- The `estimatefee` RPC is deprecated. Clients should switch to using the `estimatesmartfee` RPC, which returns better fee estimates. See [Fee Estimation Improvements](#fee-estimation-improvements) for full details on changes to the fee estimation logic and interface.
+
+- The `gettxoutsetinfo` response now contains `disk_size` and `bogosize` instead of
+  `bytes_serialized`. The first is a more accurate estimate of actual disk usage, but
+  is not deterministic. The second is unrelated to disk usage, but is a
+  database-independent metric of UTXO set size: it counts every UTXO entry as 50 + the
+  length of its scriptPubKey (See [PR 10426](https://github.com/bitcoin/bitcoin/pull/10426)).
+
+- `signrawtransaction` can no longer be used to combine multiple transactions into a single transaction. Instead, use the new `combinerawtransaction` RPC (See [PR 10571](https://github.com/bitcoin/bitcoin/pull/10571)).
+
+- `fundrawtransaction` no longer accepts a `reserveChangeKey` option. This option used to allow RPC users to fund a raw transaction using an key from the keypool for the change address without removing it from the available keys in the keypool. The key could then be re-used for a `getnewaddress` call, which could potentially result in confusing or dangerous behaviour (See [PR 10784](https://github.com/bitcoin/bitcoin/pull/10784)).
+
+- `estimatepriority` and `estimatesmartpriority` have been removed. See [Removal of Coin Age Priority](#removal-of-coin-age-priority).
+
+- The `listunspent` RPC now takes a `query_options` argument (see [PR 8952](https://github.com/bitcoin/bitcoin/pull/8952)), which is a JSON object
+  containing one or more of the following members:
+  - `minimumAmount` - a number specifying the minimum value of each UTXO
+  - `maximumAmount` - a number specifying the maximum value of each UTXO
+  - `maximumCount` - a number specifying the minimum number of UTXOs
+  - `minimumSumAmount` - a number specifying the minimum sum value of all UTXOs
+
+- The `getmempoolancestors`, `getmempooldescendants`, `getmempoolentry` and `getrawmempool` RPCs no longer return `startingpriority` and `currentpriority`. See [Removal of Coin Age Priority](#removal-of-coin-age-priority).
+
+- The `dumpwallet` RPC now returns the full absolute path to the dumped wallet. It
+  used to return no value, even if successful (See [PR 9740](https://github.com/bitcoin/bitcoin/pull/9740)).
+
+- In the `getpeerinfo` RPC, the return object for each peer now returns an `addrbind` member, which contains the ip address and port of the connection to the peer. This is in addition to the `addrlocal` member which contains the ip address and port of the local node as reported by the peer (See [PR 10478](https://github.com/bitcoin/bitcoin/pull/10478)).
+
+- The `disconnectnode` RPC can now disconnect a node specified by node ID (as well as by IP address/port). To disconnect a node based on node ID, call the RPC with the new `nodeid` argument (See [PR 10143](https://github.com/bitcoin/bitcoin/pull/10143)).
+
+- The second argument in `prioritisetransaction` has been renamed from `priority_delta` to `dummy` since Bitcoin Core no longer has a concept of coin age priority. The `dummy` argument has no functional effect, but is retained for positional argument compatibility. See [Removal of Coin Age Priority](#removal-of-coin-age-priority).
+
+- The `resendwallettransactions` RPC throws an error if the `-walletbroadcast` option is set to false (See [PR 10995](https://github.com/bitcoin/bitcoin/pull/10995)).
+
+- The second argument in the `submitblock` RPC argument has been renamed from `parameters` to `dummy`. This argument never had any effect, and the renaming is simply to communicate this fact to the user (See [PR 10191](https://github.com/bitcoin/bitcoin/pull/10191))
+  (Clients should, however, use positional arguments for `submitblock` in order to be compatible with BIP 22.)
+
+- The `verbose` argument of `getblock` has been renamed to `verbosity` and now takes an integer from 0 to 2. Verbose level 0 is equivalent to `verbose=false`. Verbose level 1 is equivalent to `verbose=true`. Verbose level 2 will give the full transaction details of each transaction in the output as given by `getrawtransaction`. The old behavior of using the `verbose` named argument and a boolean value is still maintained for compatibility.
+
+- Error codes have been updated to be more accurate for the following error cases (See [PR 9853](https://github.com/bitcoin/bitcoin/pull/9853)):
+  - `getblock` now returns RPC_MISC_ERROR if the block can't be found on disk (for
+  example if the block has been pruned). Previously returned RPC_INTERNAL_ERROR.
+  - `pruneblockchain` now returns RPC_MISC_ERROR if the blocks cannot be pruned
+  because the node is not in pruned mode. Previously returned RPC_METHOD_NOT_FOUND.
+  - `pruneblockchain` now returns RPC_INVALID_PARAMETER if the blocks cannot be pruned
+  because the supplied timestamp is too late. Previously returned RPC_INTERNAL_ERROR.
+  - `pruneblockchain` now returns RPC_MISC_ERROR if the blocks cannot be pruned
+  because the blockchain is too short. Previously returned RPC_INTERNAL_ERROR.
+  - `setban` now returns RPC_CLIENT_INVALID_IP_OR_SUBNET if the supplied IP address
+  or subnet is invalid. Previously returned RPC_CLIENT_NODE_ALREADY_ADDED.
+  - `setban` now returns RPC_CLIENT_INVALID_IP_OR_SUBNET if the user tries to unban
+  a node that has not previously been banned. Previously returned RPC_MISC_ERROR.
+  - `removeprunedfunds` now returns RPC_WALLET_ERROR if `bitcoind` is unable to remove
+  the transaction. Previously returned RPC_INTERNAL_ERROR.
+  - `removeprunedfunds` now returns RPC_INVALID_PARAMETER if the transaction does not
+  exist in the wallet. Previously returned RPC_INTERNAL_ERROR.
+  - `fundrawtransaction` now returns RPC_INVALID_ADDRESS_OR_KEY if an invalid change
+  address is provided. Previously returned RPC_INVALID_PARAMETER.
+  - `fundrawtransaction` now returns RPC_WALLET_ERROR if `bitcoind` is unable to create
+  the transaction. The error message provides further details. Previously returned
+  RPC_INTERNAL_ERROR.
+  - `bumpfee` now returns RPC_INVALID_PARAMETER if the provided transaction has
+  descendants in the wallet. Previously returned RPC_MISC_ERROR.
+  - `bumpfee` now returns RPC_INVALID_PARAMETER if the provided transaction has
+  descendants in the mempool. Previously returned RPC_MISC_ERROR.
+  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction has
+  has been mined or conflicts with a mined transaction. Previously returned
+  RPC_INVALID_ADDRESS_OR_KEY.
+  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction is not
+  BIP 125 replaceable. Previously returned RPC_INVALID_ADDRESS_OR_KEY.
+  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction has already
+  been bumped by a different transaction. Previously returned RPC_INVALID_REQUEST.
+  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction contains
+  inputs which don't belong to this wallet. Previously returned RPC_INVALID_ADDRESS_OR_KEY.
+  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction has multiple change
+  outputs. Previously returned RPC_MISC_ERROR.
+  - `bumpfee` now returns RPC_WALLET_ERROR if the provided transaction has no change
+  output. Previously returned RPC_MISC_ERROR.
+  - `bumpfee` now returns RPC_WALLET_ERROR if the fee is too high. Previously returned
+  RPC_MISC_ERROR.
+  - `bumpfee` now returns RPC_WALLET_ERROR if the fee is too low. Previously returned
+  RPC_MISC_ERROR.
+  - `bumpfee` now returns RPC_WALLET_ERROR if the change output is too small to bump the
+  fee. Previously returned RPC_MISC_ERROR.
+
+0.15.0 Change log
+=================
+
+### RPC and other APIs
+- #9485 `61a640e` ZMQ example using python3 and asyncio (mcelrath)
+- #9894 `0496e15` remove 'label' filter for rpc command help (instagibbs)
+- #9853 `02bd6e9` Fix error codes from various RPCs (jnewbery)
+- #9842 `598ef9c` Fix RPC failure testing (continuation of #9707) (jnewbery)
+- #10038 `d34995a` Add mallocinfo mode to `getmemoryinfo` RPC (laanwj)
+- #9500 `3568b30` [Qt][RPC] Autocomplete commands for 'help' command in debug console (achow101)
+- #10056 `e6156a0` [zmq] Call va_end() on va_start()ed args (kallewoof)
+- #10086 `7438cea` Trivial: move rpcserialversion into RPC option group (jlopp)
+- #10150 `350b224` [rpc] Add logging rpc (jnewbery)
+- #10208 `393160c` [wallet] Rescan abortability (kallewoof)
+- #10143 `a987def` [net] Allow disconnectnode RPC to be called with node id (jnewbery)
+- #10281 `0e8499c` doc: Add RPC interface guidelines (laanwj)
+- #9733 `d4732f3` Add getchaintxstats RPC (sipa)
+- #10310 `f4b15e2` [doc] Add hint about getmempoolentry to getrawmempool help (kallewoof)
+- #8704 `96c850c` [RPC] Transaction details in getblock (achow101)
+- #8952 `9390845` Add query options to listunspent RPC call (pedrobranco)
+- #10413 `08ac35a` Fix docs (there's no rpc command setpaytxfee) (RHavar)
+- #8384 `e317c0d` Add witness data output to TxInError messages (instagibbs)
+- #9571 `4677151` RPC: getblockchaininfo returns BIP signaling statistics  (pinheadmz)
+- #10450 `ef2d062` Fix bumpfee rpc "errors" return value (ryanofsky)
+- #10475 `39039b1` [RPC] getmempoolinfo mempoolminfee is a BTC/KB feerate (instagibbs)
+- #10478 `296928e` rpc: Add listen address to incoming connections in `getpeerinfo` (laanwj)
+- #10403 `08d0390` Fix importmulti failure to return rescan errors (ryanofsky)
+- #9740 `9fec4da` Add friendly output to dumpwallet (aideca)
+- #10426 `16f6c98` Replace bytes_serialized with bogosize (sipa)
+- #10252 `980deaf` RPC/Mining: Restore API compatibility for prioritisetransaction (luke-jr)
+- #9672 `46311e7` Opt-into-RBF for RPC & bitcoin-tx (luke-jr)
+- #10481 `9c248e3` Decodehextx scripts sanity check  (achow101)
+- #10488 `fa1f106` Note that the prioritizetransaction dummy value is deprecated, and has no meaning (TheBlueMatt)
+- #9738 `c94b89e` gettxoutproof() should return consistent result (jnewbery)
+- #10191 `00350bd` [trivial] Rename unused RPC arguments 'dummy' (jnewbery)
+- #10627 `b62b4c8` fixed listunspent rpc convert parameter (tnakagawa)
+- #10412 `bef02fb` Improve wallet rescan API (ryanofsky)
+- #10400 `1680ee0` [RPC] Add an uptime command that displays the amount of time (in seconds) bitcoind has been running (rvelhote)
+- #10683 `d81bec7` rpc: Move the `generate` RPC call to rpcwallet (laanwj)
+- #10710 `30bc0f6` REST/RPC example update (Mirobit)
+- #10747 `9edda0c` [rpc] fix verbose argument for getblock in bitcoin-cli (jnewbery)
+- #10589 `104f5f2` More economical fee estimates for RBF and RPC options to control (morcos)
+- #10543 `b27b004` Change API to estimaterawfee (morcos)
+- #10807 `afd2fca` getbalance example covers at least 6 confirms (instagibbs)
+- #10707 `75b5643` Better API for estimatesmartfee RPC  (morcos)
+- #10784 `9e8d6a3` Do not allow users to get keys from keypool without reserving them (TheBlueMatt)
+- #10857 `d445a2c` [RPC] Add a deprecation warning to getinfo's output (achow101)
+- #10571 `adf170d` [RPC]Move transaction combining from signrawtransaction to new RPC (achow101)
+- #10783 `041dad9` [RPC] Various rpc argument fixes (instagibbs)
+- #9622 `6ef3c7e` [rpc] listsinceblock should include lost transactions when parameter is a reorg'd block (kallewoof)
+- #10799 `8537187` Prevent user from specifying conflicting parameters to fundrawtx (TheBlueMatt)
+- #10931 `0b11a07` Fix misleading "Method not found" multiwallet errors (ryanofsky)
+- #10788 `f66c596` [RPC] Fix addwitnessaddress by replacing ismine with producesignature (achow101)
+- #10999 `627c3c0` Fix amounts formatting in `decoderawtransaction` (laanwj)
+- #11002 `4268426` [wallet] return correct error code from resendwallettransaction (jnewbery)
+- #11029 `96a63a3` [RPC] trivial: gettxout no longer shows version of tx (FelixWeis)
+- #11083 `6c2b008` Fix combinerawtransaction RPC help result section (jonasnick)
+- #11027 `07164bb` [RPC] Only return hex field once in getrawtransaction (achow101)
+- #10698 `5af6572` Be consistent in calling transactions "replaceable" for Opt-In RBF (TheBlueMatt)
+
+### Block and transaction handling
+- #9801 `a8c5751` Removed redundant parameter from mempool.PrioritiseTransaction (gubatron)
+- #9819 `1efc99c` Remove harmless read of unusued priority estimates (morcos)
+- #9822 `b7547fa` Remove block file location upgrade code (benma)
+- #9602 `30ff3a2` Remove coin age priority and free transactions - implementation (morcos)
+- #9548 `47510ad` Remove min reasonable fee (morcos)
+- #10249 `c73af54` Switch CCoinsMap from boost to std unordered_map (sipa)
+- #9966 `2a183de` Control mempool persistence using a command line parameter (jnewbery)
+- #10199 `318ea50` Better fee estimates (morcos)
+- #10196 `bee3529` Bugfix: PrioritiseTransaction updates the mempool tx counter (sdaftuar)
+- #10195 `1088b02` Switch chainstate db and cache to per-txout model (sipa)
+- #10284 `c2ab38b` Always log debug information for fee calculation in CreateTransaction (morcos)
+- #10503 `efbcf2b` Use REJECT_DUPLICATE for already known and conflicted txn (sipa)
+- #10537 `b3eb0d6` Few Minor per-utxo assert-semantics re-adds and tweak (TheBlueMatt)
+- #10626 `8c841a3` doc: Remove outdated minrelaytxfee comment (MarcoFalke)
+- #10559 `234ffc6` Change semantics of HaveCoinInCache to match HaveCoin (morcos)
+- #10581 `7878353` Simplify return values of GetCoin/HaveCoin(InCache) (sipa)
+- #10684 `a381f6a` Remove no longer used mempool.exists(outpoint) (morcos)
+- #10148 `d4e551a` Use non-atomic flushing with block replay (sipa)
+- #10685 `30c2130` Clarify CCoinsViewMemPool documentation (TheBlueMatt)
+- #10558 `90a002e` Address nits from per-utxo change (morcos)
+- #10706 `6859ad2` Improve wallet fee logic and fix GUI bugs (morcos)
+- #10526 `754aa02` Force on-the-fly compaction during pertxout upgrade (sipa)
+- #10985 `d896d5c` Add undocumented -forcecompactdb to force LevelDB compactions (sipa)
+- #10292 `e4bbd3d` Improved efficiency in COutPoint constructors (mm-s)
+- #10290 `8d6d43e` Add -stopatheight for benchmarking (sipa)
+
+### P2P protocol and network code
+- #9726 `7639d38` netbase: Do not print an error on connection timeouts through proxy (laanwj)
+- #9805 `5b583ef` Add seed.btc.petertodd.org to mainnet DNS seeds (petertodd)
+- #9861 `22f609f` Trivial: Debug log ambiguity fix for peer addrs (keystrike)
+- #9774 `90cb2a2` Enable host lookups for -proxy and -onion parameters (jmcorgan)
+- #9558 `7b585cf` Clarify assumptions made about when BlockCheck is called (TheBlueMatt)
+- #10135 `e19586a` [p2p] Send the correct error code in reject messages (jnewbery)
+- #9665 `eab00d9` Use cached [compact] blocks to respond to getdata messages (TheBlueMatt)
+- #10215 `a077a90` Check interruptNet during dnsseed lookups (TheBlueMatt)
+- #10234 `faf2dea` [net] listbanned RPC and QT should show correct banned subnets (jnewbery)
+- #10134 `314ebdf` [qa] Fixes segwit block relay test after inv-direct-fetch was disabled (sdaftuar)
+- #10351 `3f57c55` removed unused code in INV message (Greg-Griffith)
+- #10061 `ae78609` [net] Added SetSocketNoDelay() utility function (tjps)
+- #10408 `28c6e8d` Net: Improvements to Tor control port parser (str4d)
+- #10460 `5c63d66` Broadcast address every day, not 9 hours (sipa)
+- #10471 `400fdd0` Denote functions CNode::GetRecvVersion() and CNode::GetRefCount()  as const (pavlosantoniou)
+- #10345 `67700b3` [P2P] Timeout for headers sync (sdaftuar)
+- #10564 `8d9f45e` Return early in IsBanned (gmaxwell)
+- #10587 `de8db47` Net: Fix resource leak in ReadBinaryFile(...) (practicalswift)
+- #9549 `b33ca14` [net] Avoid possibility of NULL pointer dereference in MarkBlockAsInFlight(...) (practicalswift)
+- #10446 `2772dc9` net: avoid extra dns query per seed (theuni)
+- #10824 `9dd6a2b` Avoid unnecessary work in SetNetworkActive (promag)
+- #10948 `df3a6f4` p2p: Hardcoded seeds update pre-0.15 branch (laanwj)
+- #10977 `02f4c4a` [net] Fix use of uninitialized value in getnetworkinfo(const JSONRPCRequest&) (practicalswift)
+- #10982 `c8b62c7` Disconnect network service bits 6 and 8 until Aug 1, 2018 (TheBlueMatt)
+- #11012 `0e5cff6` Make sure to clean up mapBlockSource if we've already seen the block (theuni)
+
+### Validation
+- #9725 `67023e9` CValidationInterface Cleanups (TheBlueMatt)
+- #10178 `2584925` Remove CValidationInterface::UpdatedTransaction (TheBlueMatt)
+- #10201 `a6548a4` pass Consensus::Params& to functions in validation.cpp and make them static (mariodian)
+- #10297 `431a548` Simplify DisconnectBlock arguments/return value (sipa)
+- #10464 `f94b7d5` Introduce static DoWarning (simplify UpdateTip) (jtimon)
+- #10569 `2e7d8f8` Fix stopatheight (achow101)
+- #10192 `2935b46` Cache full script execution results in addition to signatures (TheBlueMatt)
+- #10179 `21ed30a` Give CValidationInterface Support for calling notifications on the CScheduler Thread (TheBlueMatt)
+- #10557 `66270a4` Make check to distinguish between orphan txs and old txs more efficient (morcos)
+- #10775 `7c2400c` nCheckDepth chain height fix (romanornr)
+- #10821 `16240f4` Add SSE4 optimized SHA256 (sipa)
+- #10854 `04d395e` Avoid using sizes on non-fixed-width types to derive protocol constants (gmaxwell)
+- #10945 `2a50b11` Update defaultAssumeValid according to release-process.md (gmaxwell)
+- #10986 `2361208` Update chain transaction statistics (sipa)
+- #11028 `6bdf4b3` Avoid masking of difficulty adjustment errors by checkpoints (sipa)
+- #9533 `cb598cf` Allow non-power-of-2 signature cache sizes (sipa)
+- #9208 `acd9957` Improve DisconnectTip performance (sdaftuar)
+- #10618 `f90603a` Remove confusing MAX_BLOCK_BASE_SIZE (gmaxwell)
+- #10758 `bd92424` Fix some chainstate-init-order bugs (TheBlueMatt)
+- #10550 `b7296bc` Don't return stale data from CCoinsViewCache::Cursor() (ryanofsky)
+- #10998 `2507fd5` Fix upgrade cancel warnings (TheBlueMatt)
+- #9868 `cbdb473` Abstract out the command line options for block assembly (sipa)
+
+### Build system
+- #9727 `5f0556d` Remove fallbacks for boost_filesystem < v3 (laanwj)
+- #9788 `50a2265` gitian: bump descriptors for master (theuni)
+- #9794 `7ca2f54` Minor update to qrencode package builder (mitchellcash)
+- #9514 `2cc0df1` release: Windows signing script (theuni)
+- #9921 `8b789d8` build: Probe MSG_DONTWAIT in the same way as MSG_NOSIGNAL (laanwj)
+- #10011 `32d1b34` build: Fix typo s/HAVE_DONTWAIT/HAVE_MSG_DONTWAIT (laanwj)
+- #9946 `90dd9e6` Fix build errors if spaces in path or parent directory (pinheadmz)
+- #10136 `81da4c7` build: Disable Wshadow warning (laanwj)
+- #10166 `64962ae` Ignore Doxyfile generated from Doxyfile.in template (paveljanik)
+- #10239 `0416ea9` Make Boost use std::atomic internally (sipa)
+- #10228 `27faa6c` build: regenerate bitcoin-config.h as necessary (theuni)
+- #10273 `8979f45` [scripts] Minor improvements to `macdeployqtplus` script (chrisgavin)
+- #10325 `a26280b` 0.15.0 Depends Updates (fanquake)
+- #10328 `79aeff6` Update contrib/debian to latest Ubuntu PPA upload (TheBlueMatt)
+- #7522 `d25449f` Bugfix: Only use git for build info if the repository is actually the right one (luke-jr)
+- #10489 `e654d61` build: silence gcc7's implicit fallthrough warning (theuni)
+- #10549 `ad1a13e` Avoid printing generic and duplicated "checking for QT" during ./configure (drizzt)
+- #10628 `8465b68` [depends] expat 2.2.1 (fanquake)
+- #10806 `db825d2` build: verify that the assembler can handle crc32 functions (theuni)
+- #10766 `b4d03be` Building Environment: Set ARFLAGS to cr (ReneNyffenegger)
+- #10803 `91edda8` Explicitly search for bdb5.3 (pstratem)
+- #10855 `81560b0` random: only use getentropy on openbsd (theuni)
+- #10508 `1caafa6` Run Qt wallet tests on travis (ryanofsky)
+- #10851 `e222618` depends: fix fontconfig with newer glibc (theuni)
+- #10971 `88b1e4b` build: fix missing sse42 in depends builds (theuni)
+- #11097 `129b03f` gitian: quick hack to fix version string in releases (theuni)
+- #10039 `919aaf6` Fix compile errors with Qt 5.3.2 and Boost 1.55.0 (ryanofsky)
+- #10168 `7032021` Fix build warning from #error text (jnewbery)
+- #10301 `318392c` Check if sys/random.h is required for getentropy (jameshilliard)
+
+### GUI
+- #9724 `1a9fd5c` Qt/Intro: Add explanation of IBD process (luke-jr)
+- #9834 `b00ba62` qt: clean up initialize/shutdown signals (benma)
+- #9481 `ce01e62` [Qt] Show more significant warning if we fall back to the default fee (jonasschnelli)
+- #9974 `b9f930b` Add basic Qt wallet test (ryanofsky)
+- #9690 `a387d3a` Change 'Clear' button string to 'Reset' (da2x)
+- #9592 `9c7b7cf` [Qt] Add checkbox in the GUI to opt-in to RBF when creating a transaction (ryanofsky)
+- #10098 `2b477e6` Make qt wallet test compatible with qt4 (ryanofsky)
+- #9890 `1fa4ae6` Add a button to open the config file in a text editor (ericshawlinux)
+- #10156 `51833a1` Fix for issues with startup and multiple monitors on windows (AllanDoensen)
+- #10177 `de01da7` Changed "Send" button default status from true to false (KibbledJiveElkZoo)
+- #10221 `e96486c` Stop treating coinbase outputs differently in GUI: show them at 1conf (TheBlueMatt)
+- #10231 `987a6c0` [Qt] Reduce a significant cs_main lock freeze (jonasschnelli)
+- #10242 `f6f3b58` [qt] Don't call method on null WalletModel object (ryanofsky)
+- #10093 `a3e756b` [Qt] Don't add arguments of sensitive command to console window (jonasschnelli)
+- #10362 `95546c8` [GUI] Add OSX keystroke to RPCConsole info (spencerlievens)
+- #9697 `962cd3f` [Qt] simple fee bumper with user verification (jonasschnelli)
+- #10390 `e477516` [wallet] remove minimum total fee option (instagibbs)
+- #10420 `4314544` Add Qt tests for wallet spends & bumpfee (ryanofsky)
+- #10454 `c1c9a95` Fix broken q4 test build (ryanofsky)
+- #10449 `64beb13` Overhaul Qt fee bumper (jonasschnelli)
+- #10582 `7c72fb9` Pass in smart fee slider value to coin control dialog (morcos)
+- #10673 `4c72cc3` [qt] Avoid potential null pointer dereference in TransactionView::exportClicked() (practicalswift)
+- #10769 `8fdd23a` [Qt] replace fee slider with a Dropdown, extend conf. targets (jonasschnelli)
+- #10870 `412b466` [Qt] Use wallet 0 in rpc console if running with multiple wallets (jonasschnelli)
+- #10988 `a9dd111` qt: Increase BLOCK_CHAIN_SIZE constants (laanwj)
+- #10644 `e292140` Slightly overhaul NSI pixmaps (jonasschnelli)
+- #10660 `0c3542e` Allow to cancel the txdb upgrade via splashscreen keypress 'q' (jonasschnelli)
+
+### Wallet
+- #9359 `f7ec7cf` Add test for CWalletTx::GetImmatureCredit() returning stale values (ryanofsky)
+- #9576 `56ab672` [wallet] Remove redundant initialization (practicalswift)
+- #9333 `fa625b0` Document CWalletTx::mapValue entries and remove erase of nonexistent "version" entry (ryanofsky)
+- #9906 `72fb515` Disallow copy constructor CReserveKeys (instagibbs)
+- #9369 `3178b2c` Factor out CWallet::nTimeSmart computation into a method (ryanofsky)
+- #9830 `afcd7c0` Add safe flag to listunspent result (NicolasDorier)
+- #9993 `c49355c` Initialize nRelockTime (pstratem)
+- #9818 `3d857f3` Save watch only key timestamps when reimporting keys (ryanofsky)
+- #9294 `f34cdcb` Use internal HD chain for change outputs (hd split) (jonasschnelli)
+- #10164 `e183ea2` Wallet: reduce excess logic InMempool() (kewde)
+- #10186 `c9ff4f8` Remove SYNC_TRANSACTION_NOT_IN_BLOCK magic number (jnewbery)
+- #10226 `64c45aa` wallet: Use boost to more portably ensure -wallet specifies only a filename (luke-jr)
+- #9827 `c91ca0a` Improve ScanForWalletTransactions return value (ryanofsky)
+- #9951 `fa1ac28` Wallet database handling abstractions/simplifications (laanwj)
+- #10265 `c29a0d4` [wallet] [moveonly] Check non-null pindex before potentially referencing (kallewoof)
+- #10283 `a550f6e` Cleanup: reduce to one GetMinimumFee call signature (morcos)
+- #10294 `e2b99b1` [Wallet] unset change position when there is no change (instagibbs)
+- #10115 `d3dce0e` Avoid reading the old hd master key during wallet encryption (TheBlueMatt)
+- #10341 `18c9deb` rpc/wallet: Workaround older UniValue which returns a std::string temporary for get_str (luke-jr)
+- #10308 `94e5227` [wallet] Securely erase potentially sensitive keys/values (tjps)
+- #10257 `ea1fd43` [test] Add test for getmemoryinfo (jimmysong)
+- #10295 `ce8176d` [qt] Move some WalletModel functions into CWallet (ryanofsky)
+- #10506 `7cc2c67` Fix bumpfee test after #10449 (ryanofsky)
+- #10500 `098b01d` Avoid CWalletTx copies in GetAddressBalances and GetAddressGroupings (ryanofsky)
+- #10455 `0747d33` Simplify feebumper minimum fee code slightly (ryanofsky)
+- #10522 `2805d60` [wallet] Remove unused variables (practicalswift)
+- #8694 `177433a` Basic multiwallet support (luke-jr)
+- #10598 `7a74f88` Supress struct/class mismatch warnings introduced in #10284 (paveljanik)
+- #9343 `209eef6` Don't create change at dust limit (morcos)
+- #10744 `ed88e31` Use method name via __func__ macro (darksh1ne)
+- #10712 `e8b9523` Add change output if necessary to reduce excess fee (morcos)
+- #10816 `1c011ff` Properly forbid -salvagewallet and -zapwallettxes for multi wallet (morcos)
+- #10235 `5cfdda2` Track keypool entries as internal vs external in memory (TheBlueMatt)
+- #10330 `bf0a08b` [wallet] fix zapwallettxes interaction with persistent mempool (jnewbery)
+- #10831 `0b01935` Batch flushing operations to the walletdb during top up and increase keypool size (gmaxwell)
+- #10795 `7b6e8bc` No longer ever reuse keypool indexes (TheBlueMatt)
+- #10849 `bde4f93` Multiwallet: simplest endpoint support (jonasschnelli)
+- #10817 `9022aa3` Redefine Dust and add a discard_rate (morcos)
+- #10883 `bf3b742` Rename -usewallet to -rpcwallet (morcos)
+- #10604 `420238d` [wallet] [tests] Add listwallets RPC, include wallet name in `getwalletinfo` and add multiwallet test (jnewbery)
+- #10885 `70888a3` Reject invalid wallets (promag)
+- #10949 `af56397` Clarify help message for -discardfee (morcos)
+- #10942 `2e857bb` Eliminate fee overpaying edge case when subtracting fee from recipients (morcos)
+- #10995 `fa64636` Fix resendwallettransactions assert failure if -walletbroadcast=0 (TheBlueMatt)
+- #11022 `653a46d` Basic keypool topup (jnewbery)
+- #11081 `9fe1f6b` Add length check for CExtKey deserialization (jonasschnelli, guidovranken)
+- #11044 `4ef8374` [wallet] Keypool topup cleanups (jnewbery)
+- #11145 `e51bb71` Fix rounding bug in calculation of minimum change (morcos)
+- #9605 `779f2f9` Use CScheduler for wallet flushing, remove ThreadFlushWalletDB (TheBlueMatt)
+- #10108 `4e3efd4` ApproximateBestSubset should take inputs by reference, not value (RHavar)
+
+### Tests and QA
+- #9744 `8efd1c8` Remove unused module from rpc-tests (34ro)
+- #9657 `7ff4a53` Improve rpc-tests.py (jnewbery)
+- #9766 `7146d96` Add --exclude option to rpc-tests.py (jnewbery)
+- #9577 `d6064a8` Fix docstrings in qa tests (jnewbery)
+- #9823 `a13a417` qa: Set correct path for binaries in rpc tests (MarcoFalke)
+- #9847 `6206252` Extra test vector for BIP32 (sipa)
+- #9350 `88c2ae3` [Trivial] Adding label for amount inside of tx_valid/tx_invalid.json (Christewart)
+- #9888 `36afd4d` travis: Verify commits only for one target (MarcoFalke)
+- #9904 `58861ad` test: Fail if InitBlockIndex fails (laanwj)
+- #9828 `67c5cc1` Avoid -Wshadow warnings in wallet_tests (ryanofsky)
+- #9832 `48c3429` [qa] assert_start_raises_init_error (NicolasDorier)
+- #9739 `9d5fcbf` Fix BIP68 activation test (jnewbery)
+- #9547 `d32581c` bench: Assert that division by zero is unreachable (practicalswift)
+- #9843 `c78adbf` Fix segwit getblocktemplate test (jnewbery)
+- #9929 `d5ce14e` tests: Delete unused function _rpchost_to_args (laanwj)
+- #9555 `19be26a` [test] Avoid reading a potentially uninitialized variable in tx_invalid-test (transaction_tests.cpp) (practicalswift)
+- #9945 `ac23a7c` Improve logging in bctest.py if there is a formatting mismatch (jnewbery)
+- #9768 `8910b47` [qa] Add logging to test_framework.py (jnewbery)
+- #9972 `21833f9` Fix extended rpc tests broken by #9768 (jnewbery)
+- #9977 `857d1e1` QA: getblocktemplate_longpoll.py should always use >0 fee tx (sdaftuar)
+- #9970 `3cc13ea` Improve readability of segwit.py, smartfees.py (sdaftuar)
+- #9497 `2c781fb` CCheckQueue Unit Tests (JeremyRubin)
+- #10024 `9225de2` [trivial] Use log.info() instead of print() in remaining functional test cases (jnewbery)
+- #9956 `3192e52` Reorganise qa directory (jnewbery)
+- #10017 `02d64bd` combine_logs.py - aggregates log files from multiple bitcoinds during functional tests (jnewbery)
+- #10047 `dfef6b6` [tests] Remove unused variables and imports (practicalswift)
+- #9701 `a230b05` Make bumpfee tests less fragile (ryanofsky)
+- #10053 `ca20923` [test] Allow functional test cases to be skipped (jnewbery)
+- #10052 `a0b1e57` [test] Run extended tests once daily in Travis (jnewbery)
+- #10069 `1118493` [QA] Fix typo in fundrawtransaction test (NicolasDorier)
+- #10083 `c044f03` [QA] Renaming rawTx into rawtx (NicolasDorier)
+- #10073 `b1a4f27` Actually run assumevalid.py (jnewbery)
+- #9780 `c412fd8` Suppress noisy output from qa tests in Travis (jnewbery)
+- #10096 `79af9fb` Check that all test scripts in test/functional are being run (jnewbery)
+- #10076 `5b029aa` [qa] combine_logs: Use ordered list for logfiles (MarcoFalke)
+- #10107 `f2734c2` Remove unused variable. Remove accidental trailing semicolons in Python code (practicalswift)
+- #10109 `8ac8041` Remove SingleNodeConnCB (jnewbery)
+- #10114 `edc62c9` [tests] sync_with_ping should assert that ping hasn't timed out (jnewbery)
+- #10128 `427d2fd` Speed Up CuckooCache tests (JeremyRubin)
+- #10072 `12af74b` Remove sources of unreliablility in extended functional tests (jnewbery)
+- #10077 `ebfd653` [qa] Add setnetworkactive smoke test (MarcoFalke)
+- #10152 `080d7c7` [trivial] remove unused line in Travis config (jnewbery)
+- #10159 `df1ca9e` [tests] color test results and sort alphabetically (jnewbery)
+- #10124 `88799ea` [test] Suppress test logging spam (jnewbery)
+- #10142 `ed09dd3` Run bitcoin_test-qt under minimal QPA platform (ryanofsky)
+- #9949 `a27dbc5` [bench] Avoid function call arguments which are pointers to uninitialized values (practicalswift)
+- #10187 `b44adf9` tests: Fix test_runner return value in case of skipped test (laanwj)
+- #10197 `d86bb07` [tests] Functional test warnings (jnewbery)
+- #10219 `9111df9` Tests: Order Python Tests Differently (jimmysong)
+- #10229 `f3db4c6` Tests: Add test for getdifficulty (jimmysong)
+- #10224 `2723bcd` [test] Add test for getaddednodeinfo (jimmysong)
+- #10023 `c530c15` [tests] remove maxblocksinflight.py (functionality covered by other test) (jnewbery)
+- #10097 `1b25b6d` Move zmq test skipping logic into individual test case (jnewbery)
+- #10272 `54e2d87` [Tests] Prevent warning: variable 'x' is uninitialized (paveljanik)
+- #10225 `e0a7e19` [test] Add aborttrescan tests (kallewoof)
+- #10278 `8254a8a` [test] Add Unit Test for GetListenPort (jimmysong)
+- #10280 `47535d7` [test] Unit test amount.h/amount.cpp (jimmysong)
+- #10256 `80c3a73` [test] Add test for gettxout to wallet.py (jimmysong)
+- #10264 `492d22f` [test] Add tests for getconnectioncount, getnettotals and ping (jimmysong)
+- #10169 `8f3e384` [tests] Remove func test code duplication (jnewbery)
+- #10198 `dc8fc0c` [tests] Remove is_network_split from functional test framework (jnewbery)
+- #10255 `3c5e6c9` [test] Add test for listaddressgroupings (jimmysong)
+- #10137 `75171f0` Remove unused import. Remove accidental trailing semicolons (practicalswift)
+- #10307 `83073de` [tests] allow zmq test to be run in out-of-tree builds (jnewbery)
+- #10344 `e927483` [tests] Fix abandonconflict.py intermittency (jnewbery)
+- #10318 `170bc2c` [tests] fix wait_for_inv() (jnewbery)
+- #10171 `fff72de` [tests] Add node methods to test framework (jnewbery)
+- #10352 `23d78c4` test: Add elapsed time to RPC tracing (laanwj)
+- #10342 `6a796b2` [tests] Improve mempool_persist test (jnewbery)
+- #10287 `776ba23` [tests] Update Unit Test for addrman.h/addrman.cpp (jimmysong)
+- #10365 `7ee5236` [tests] increase timeouts in sendheaders test (jnewbery)
+- #10361 `f6241b3` qa: disablewallet: Check that wallet is really disabled (MarcoFalke)
+- #10371 `4b766fc` [tests] Clean up addrman_tests.cpp (jimmysong)
+- #10253 `87abe20` [test] Add test for getnetworkhashps (jimmysong)
+- #10376 `8bd16ee` [tests] fix disconnect_ban intermittency (jnewbery)
+- #10374 `5411997` qa: Warn when specified test is not found (MarcoFalke)
+- #10405 `0542978` tests: Correct testcase in script_tests.json for large number OP_EQUAL (laanwj)
+- #10429 `6b99daf` tests: fix spurious addrman test failure (theuni)
+- #10433 `8e57256` [tests] improve tmpdir structure (jnewbery)
+- #10415 `217b416` [tests] Speed up fuzzing by ~200x when using afl-fuzz (practicalswift)
+- #10445 `b4b057a` Add test for empty chain and reorg consistency for gettxoutsetinfo (gmaxwell)
+- #10423 `1aefc94` [tests] skipped tests should clean up after themselves (jnewbery)
+- #10359 `329fc1d` [tests] functional tests should call BitcoinTestFramework start/stop node methods (jnewbery)
+- #10514 `e103b3f` Bugfix: missing == 0 after randrange (sipa)
+- #10515 `c871f32` [test] Add test for getchaintxstats (jimmysong)
+- #10509 `bea5b00` Remove xvfb configuration from travis (ryanofsky)
+- #10535 `30853e1` [qa] fundrawtx: Fix shutdown race (MarcoFalke)
+- #9909 `300f8e7` tests: Add FindEarliestAtLeast test for edge cases (ryanofsky)
+- #10331 `75e898c` Share config between util and functional tests (jnewbery)
+- #10321 `e801084` Use FastRandomContext for all tests (sipa)
+- #10524 `6c2d81f` [tests] Remove printf(...) (practicalswift)
+- #10547 `71ab6e5` [tests] Use FastRandomContext instead of boost::random::{mt19937,uniform_int_distribution} (practicalswift)
+- #10551 `6702617` [Tests] Wallet encryption functional tests (achow101)
+- #10555 `643fa0b` [tests] various improvements to zmq_test.py (jnewbery)
+- #10533 `d083bd9` [tests] Use cookie auth instead of rpcuser and rpcpassword (achow101)
+- #10632 `c68a9a6` qa: Add stopatheight test (MarcoFalke)
+- #10636 `4bc853b` [qa] util: Check return code after closing bitcoind proc (MarcoFalke)
+- #10662 `e0a7801` Initialize randomness in benchmarks (achow101)
+- #10612 `7c87a9c` The young person's guide to the test_framework (jnewbery)
+- #10659 `acb1153` [qa] blockchain: Pass on closed connection during generate call (MarcoFalke)
+- #10690 `416af3e` [qa] Bugfix: allow overriding extra_args in ComparisonTestFramework (sdaftuar)
+- #10556 `65cc7aa` Move stop/start functions from utils.py into BitcoinTestFramework (jnewbery)
+- #10704 `dd07f47` [tests] nits in dbcrash.py (jnewbery)
+- #10743 `be82498` [test] don't run dbcrash.py on Travis (jnewbery)
+- #10761 `d3b5870` [tests] fix replace_by_fee.py (jnewbery)
+- #10759 `1d4805c` Fix multi_rpc test for hosts that dont default to utf8 (TheBlueMatt)
+- #10190 `e4f226a` [tests] mining functional tests (including regression test for submitblock) (jnewbery)
+- #10739 `1fc783f` test: Move variable `state` down where it is used (paveljanik)
+- #9980 `fee0d80` Fix mem access violation merkleblock (Christewart)
+- #10893 `0c173a1` [QA] Avoid running multiwallet.py twice (jonasschnelli)
+- #10927 `9d5e8f9` test: Make sure wallet.backup is created in temp path (laanwj)
+- #10899 `f29d5db` [test] Qt: Use _putenv_s instead of setenv on Windows builds (brianmcmichael)
+- #10912 `5c8eb79` [tests] Fix incorrect memory_cleanse(…) call in crypto_tests.cpp (practicalswift)
+- #11001 `fa8a063` [tests] Test disconnecting unsupported service bits logic (jnewbery)
+- #10695 `929fd72` [qa] Rewrite BIP65/BIP66 functional tests (sdaftuar)
+- #10963 `ecd2135` [bench] Restore format state of cout after printing with std::fixed/setprecision (practicalswift)
+- #11025 `e5d26e4` qa: Fix inv race in example_test (MarcoFalke)
+- #10765 `2c811e0` Tests: address placement should be deterministic by default (ReneNyffenegger)
+- #11000 `ac016e1` test: Add resendwallettransactions functional tests (promag)
+- #11032 `aeb3175` [qa] Fix block message processing error in sendheaders.py (sdaftuar)
+- #10105 `0b9fb68` [tests] fixup - make all Travis test runs quiet, non just cron job runs (jnewbery)
+- #10222 `6ce7337` [tests] test_runner - check unicode (jnewbery)
+- #10327 `35da2ae` [tests] remove import-abort-rescan.py (jnewbery)
+- #11023 `bf74d37` [tests] Add option to attach a python debugger if functional test fails (jnewbery)
+- #10565 `8c2098a` [coverage] Remove subtrees and benchmarks from coverage report (achow101)
+
+### Miscellaneous
+- #9871 `be8ba2c` Add a tree sha512 hash to merge commits (sipa)
+- #9821 `d19d45a` util: Specific GetOSRandom for Linux/FreeBSD/OpenBSD (laanwj)
+- #9903 `ba80a68` Docs: add details to -rpcclienttimeout doc (ian-kelling)
+- #9910 `53c300f` Docs: correct and elaborate -rpcbind doc (ian-kelling)
+- #9905 `01b7cda` [contrib] gh-merge: Move second sha512 check to the end (MarcoFalke)
+- #9880 `4df8213` Verify Tree-SHA512s in merge commits, enforce sigs are not SHA1 (TheBlueMatt)
+- #9932 `00c13ea` Fix verify-commits on travis and always check top commit's tree (TheBlueMatt)
+- #9952 `6996e06` Add historical release notes for 0.14.0 (laanwj)
+- #9940 `fa99663` Fix verify-commits on OSX, update for new bad Tree-SHA512, point travis to different keyservers (TheBlueMatt)
+- #9963 `8040ae6` util: Properly handle errors during log message formatting (laanwj)
+- #9984 `cce056d` devtools: Make github-merge compute SHA512 from git, instead of worktree (laanwj)
+- #9995 `8bcf934` [doc] clarify blockchain size and pruning (askmike)
+- #9734 `0c17afc` Add updating of chainTxData to release process (sipa)
+- #10063 `530fcbd` add missing spaces so that markdown recognizes headline (flack)
+- #10085 `db1ae54` Docs: remove 'noconnect' option (jlopp)
+- #10090 `8e4f7e7` Update bitcoin.conf with example for pruning (coinables)
+- #9424 `1a5aaab` Change LogAcceptCategory to use uint32_t rather than sets of strings (gmaxwell)
+- #10036 `fbf36ca` Fix init README format to render correctly on github (jlopp)
+- #10058 `a2cd0b0` No need to use OpenSSL malloc/free (tjps)
+- #10123 `471ed00` Allow debug logs to be excluded from specified component (jnewbery)
+- #10104 `fadf078` linearize script: Option to use RPC cookie (achow101)
+- #10162 `a3a2160` [trivial] Log calls to getblocktemplate (jnewbery)
+- #10155 `928695b` build: Deduplicate version numbers (laanwj)
+- #10211 `a86255b` [doc] Contributor fixes & new "finding reviewers" section (kallewoof)
+- #10250 `1428f30` Fix some empty vector references (sipa)
+- #10270 `95f5e44` Remove Clang workaround for Boost 1.46 (fanquake)
+- #10263 `cb007e4` Trivial: fix fee estimate write error log message (CryptAxe)
+- #9670 `bd9ec0e` contrib: github-merge improvements (laanwj)
+- #10260 `1d75597` [doc] Minor corrections to osx dependencies (fanquake)
+- #10189 `750c5a5` devtools/net: add a verifier for scriptable changes. Use it to make CNode::id private (theuni)
+- #10322 `bc64b5a` Use hardware timestamps in RNG seeding (sipa)
+- #10381 `7f2b9e0` Shadowing warnings are not enabled by default, update doc accordingly (paveljanik)
+- #10380 `b6ee855` [doc] Removing comments about dirty entries on txmempool (madeo)
+- #10383 `d0c37ee` [logging] log system time and mock time (jnewbery)
+- #10404 `b45a52a` doc: Add logging to FinalizeNode() (sdaftuar)
+- #10388 `526e839` Output line to debug.log when IsInitialBlockDownload latches to false (morcos)
+- #10372 `15254e9` Add perf counter data to GetStrongRandBytes state in scheduler (TheBlueMatt)
+- #10461 `55b72f3` Update style guide (sipa)
+- #10486 `10e8c0a` devtools: Retry after signing fails in github-merge (laanwj)
+- #10447 `f259263` Make bitcoind invalid argument error message specific (laanwj)
+- #10495 `6a38b79` contrib: Update location of seeds.txt (laanwj)
+- #10469 `b6b150b` Fixing typo in rpcdump.cpp help message (keystrike)
+- #10451 `27b9931` contrib/init/bitcoind.openrcconf: Don't disable wallet by default (luke-jr)
+- #10323 `00d3692` Update to latest libsecp256k1 master (sipa)
+- #10422 `cec9e1e` Fix timestamp in fee estimate debug message (morcos)
+- #10566 `5d034ee` [docs] Use the "domain name setup" image (previously unused) in the gitian docs (practicalswift)
+- #10534 `a514ac3` Clarify prevector::erase and avoid swap-to-clear (sipa)
+- #10575 `22ec768` Header include guideline (sipa)
+- #10480 `fbf5d3b` Improve commit-check-script.sh (sipa)
+- #10502 `1ad3d4e` scripted-diff: Remove BOOST_FOREACH, Q_FOREACH and PAIRTYPE (jtimon)
+- #10377 `b63be2c` Use rdrand as entropy source on supported platforms (sipa)
+- #9895 `228c319` Turn TryCreateDirectory() into TryCreateDirectories() (benma)
+- #10602 `d76e84a` Make clang-format use C++11 features (e.g. A<A<int>> instead of A<A<int> >) (practicalswift)
+- #10623 `c38f540` doc: Add 0.14.2 release notes (MarcoFalke)
+- #10276 `b750b33` contrib/verifybinaries: allow filtering by platform (knocte)
+- #10248 `01c4b14` Rewrite addrdb with less duplication using CHashVerifier (sipa)
+- #10577 `232508f` Add an explanation of quickly hashing onto a non-power of two range (gmaxwell)
+- #10608 `eee398f` Add a comment explaining the use of MAX_BLOCK_BASE_SIZE (gmaxwell)
+- #10728 `7397af9` fix typo in help text for removeprunedfunds (AkioNak)
+- #10193 `6dbcc74` scripted-diff: Remove #include <boost/foreach.hpp> (jtimon)
+- #10676 `379aed0` document script-based return fields for validateaddress (instagibbs)
+- #10651 `cef4b5c` Verify binaries from bitcoincore.org and bitcoin.org (TheBlueMatt)
+- #10786 `ca4c545` Add PR description to merge commit in github-merge.py (sipa)
+- #10812 `c5904e8` [utils] Allow bitcoin-cli's -rpcconnect option to be used with square brackets (jnewbery)
+- #10842 `3895e25` Fix incorrect Doxygen tag (@ince → @since). Doxygen parameter name matching (practicalswift)
+- #10681 `df0793f` add gdb attach process to test README (instagibbs)
+- #10789 `1124328` Punctuation/grammer fixes in rpcwallet.cpp (stevendlander)
+- #10655 `78f307b` Properly document target_confirmations in listsinceblock (RHavar)
+- #10917 `5c003cb` developer-notes: add reference to snake_case and PascalCase (benma)
+- #11003 `4b5a7ce` Docs: Capitalize bullet points in CONTRIBUTING guide (eklitzke)
+- #10968 `98aa3f6` Add instructions for parallel gitian builds (coblee)
+- #11076 `1c4b9b3` 0.15 release-notes nits: fix redundancy, remove accidental parenthesis & fix range style (practicalswift)
+- #11090 `8f0121c` Update contributor names in release-notes.md (Derek701)
+- #11056 `cbdd338` disable jni in builds (instagibbs)
+- #11080 `2b59cfb` doc: Update build-openbsd for 6.1 (laanwj)
+- #11119 `0a6af47` [doc] build-windows: Mention that only trusty works (MarcoFalke)
+- #11108 `e8ad101` Changing -txindex requires -reindex, not -reindex-chainstate (TheBlueMatt)
+- #9792 `342b9bc` FastRandomContext improvements and switch to ChaCha20 (sipa)
+- #9505 `67ed40e` Prevector Quick Destruct (JeremyRubin)
+- #10820 `ef37f20` Use cpuid intrinsics instead of asm code (sipa)
+- #9999 `a328904` [LevelDB] Plug leveldb logs to bitcoin logs (NicolasDorier)
+- #9693 `c5e9e42` Prevent integer overflow in ReadVarInt (gmaxwell)
+- #10129 `351d0ad` scheduler: fix sub-second precision with boost < 1.50 (theuni)
+- #10153 `fade788` logging: Fix off-by-one for shrinkdebugfile default (MarcoFalke)
+- #10305 `c45da32` Fix potential NPD introduced in b297426c (TheBlueMatt)
+- #10338 `daf3e7d` Maintain state across GetStrongRandBytes calls (sipa)
+- #10544 `a4fe077` Update to LevelDB 1.20 (sipa)
+- #10614 `cafe24f` random: fix crash on some 64bit platforms (theuni)
+- #10714 `2a09a38` Avoid printing incorrect block indexing time due to uninitialized variable (practicalswift)
+- #10837 `8bc6d1f` Fix resource leak on error in GetDevURandom (corebob)
+- #10832 `89bb036` init: Factor out AppInitLockDataDirectory and fix startup core dump issue (laanwj)
+- #10914 `b995a37` Add missing lock in CScheduler::AreThreadsServicingQueue() (TheBlueMatt)
+- #10958 `659c096` Update to latest Bitcoin patches for LevelDB (sipa)
+- #10919 `c1c671f` Fix more init bugs (TheBlueMatt)
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- ロハン ダル
+- Ahmad Kazi
+- aideca
+- Akio Nakamura
+- Alex Morcos
+- Allan Doensen
+- Andres G. Aragoneses
+- Andrew Chow
+- Angel Leon
+- Awemany
+- Bob McElrath
+- Brian McMichael
+- BtcDrak
+- Charlie Lee
+- Chris Gavin
+- Chris Stewart
+- Cory Fields
+- CryptAxe
+- Dag Robole
+- Daniel Aleksandersen
+- Daniel Cousens
+- darksh1ne
+- Dimitris Tsapakidis
+- Eric Shaw
+- Evan Klitzke
+- fanquake
+- Felix Weis
+- flack
+- Guido Vranken
+- Greg Griffith
+- Gregory Maxwell
+- Gregory Sanders
+- Ian Kelling
+- Jack Grigg
+- James Evans
+- James Hilliard
+- Jameson Lopp
+- Jeremy Rubin
+- Jimmy Song
+- João Barbosa
+- Johnathan Corgan
+- John Newbery
+- Jonas Schnelli
+- Jorge Timón
+- Karl-Johan Alm
+- kewde
+- KibbledJiveElkZoo
+- Kirit Thadaka
+- kobake
+- Kyle Honeycutt
+- Lawrence Nahum
+- Luke Dashjr
+- Marco Falke
+- Marcos Mayorga
+- Marijn Stollenga
+- Mario Dian
+- Mark Friedenbach
+- Marko Bencun
+- Masahiko Hyuga
+- Matt Corallo
+- Matthew Zipkin
+- Matthias Grundmann
+- Michael Goldstein
+- Michael Rotarius
+- Mikerah
+- Mike van Rossum
+- Mitchell Cash
+- Nicolas Dorier
+- Patrick Strateman
+- Pavel Janík
+- Pavlos Antoniou
+- Pavol Rusnak
+- Pedro Branco
+- Peter Todd
+- Pieter Wuille
+- practicalswift
+- René Nyffenegger
+- Ricardo Velhote
+- romanornr
+- Russell Yanofsky
+- Rusty Russell
+- Ryan Havar
+- shaolinfry
+- Shigeya Suzuki
+- Simone Madeo
+- Spencer Lievens
+- Steven D. Lander
+- Suhas Daftuar
+- Takashi Mitsuta
+- Thomas Snider
+- Timothy Redaelli
+- tintinweb
+- tnaka
+- Warren Togami
+- Wladimir J. van der Laan
+
+As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/).
diff --git a/doc/release-process.md b/doc/release-process.md
index 5a99b726f..f429b4bbd 100644
--- a/doc/release-process.md
+++ b/doc/release-process.md
@@ -111,16 +111,16 @@ The gbuild invocations below <b>DO NOT DO THIS</b> by default.
 ### Build and sign Bitcoin Core for Linux, Windows, and OS X:
 
     pushd ./gitian-builder
-    ./bin/gbuild --memory 3000 --commit bitcoin=v${VERSION} ../bitcoin/contrib/gitian-descriptors/gitian-linux.yml
+    ./bin/gbuild --num-make 2 --memory 3000 --commit bitcoin=v${VERSION} ../bitcoin/contrib/gitian-descriptors/gitian-linux.yml
     ./bin/gsign --signer $SIGNER --release ${VERSION}-linux --destination ../gitian.sigs/ ../bitcoin/contrib/gitian-descriptors/gitian-linux.yml
     mv build/out/bitcoin-*.tar.gz build/out/src/bitcoin-*.tar.gz ../
 
-    ./bin/gbuild --memory 3000 --commit bitcoin=v${VERSION} ../bitcoin/contrib/gitian-descriptors/gitian-win.yml
+    ./bin/gbuild --num-make 2 --memory 3000 --commit bitcoin=v${VERSION} ../bitcoin/contrib/gitian-descriptors/gitian-win.yml
     ./bin/gsign --signer $SIGNER --release ${VERSION}-win-unsigned --destination ../gitian.sigs/ ../bitcoin/contrib/gitian-descriptors/gitian-win.yml
     mv build/out/bitcoin-*-win-unsigned.tar.gz inputs/bitcoin-win-unsigned.tar.gz
     mv build/out/bitcoin-*.zip build/out/bitcoin-*.exe ../
 
-    ./bin/gbuild --memory 3000 --commit bitcoin=v${VERSION} ../bitcoin/contrib/gitian-descriptors/gitian-osx.yml
+    ./bin/gbuild --num-make 2 --memory 3000 --commit bitcoin=v${VERSION} ../bitcoin/contrib/gitian-descriptors/gitian-osx.yml
     ./bin/gsign --signer $SIGNER --release ${VERSION}-osx-unsigned --destination ../gitian.sigs/ ../bitcoin/contrib/gitian-descriptors/gitian-osx.yml
     mv build/out/bitcoin-*-osx-unsigned.tar.gz inputs/bitcoin-osx-unsigned.tar.gz
     mv build/out/bitcoin-*.tar.gz build/out/bitcoin-*.dmg ../
diff --git a/doc/zmq.md b/doc/zmq.md
index 1019ff665..38c58fb7f 100644
--- a/doc/zmq.md
+++ b/doc/zmq.md
@@ -72,7 +72,7 @@ For instance:
 Each PUB notification has a topic and body, where the header
 corresponds to the notification type. For instance, for the
 notification `-zmqpubhashtx` the topic is `hashtx` (no null
-terminator) and the body is the hexadecimal transaction hash (32
+terminator) and the body is the transaction hash (32
 bytes).
 
 These options can also be provided in bitcoin.conf.
diff --git a/share/certs/BitcoinFoundation_Apple_Cert.pem b/share/certs/BitcoinFoundation_Apple_Cert.pem
deleted file mode 100644
index beb0d7073..000000000
--- a/share/certs/BitcoinFoundation_Apple_Cert.pem
+++ /dev/null
@@ -1,37 +0,0 @@
-Bag Attributes
-    friendlyName: Developer ID Application: BITCOIN FOUNDATION, INC., THE
-    localKeyID: 6B 9C 6C A8 A5 73 70 70 E2 57 A3 49 D8 62 FB 97 C7 A5 5D 5E 
-subject=/UID=PBV4GLS9J4/CN=Developer ID Application: BITCOIN FOUNDATION, INC., THE/OU=PBV4GLS9J4/O=BITCOIN FOUNDATION, INC., THE/C=US
-issuer=/CN=Developer ID Certification Authority/OU=Apple Certification Authority/O=Apple Inc./C=US
------BEGIN CERTIFICATE-----
-MIIFhzCCBG+gAwIBAgIIJ0r1rumyfZAwDQYJKoZIhvcNAQELBQAweTEtMCsGA1UE
-AwwkRGV2ZWxvcGVyIElEIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MSYwJAYDVQQL
-DB1BcHBsZSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTETMBEGA1UECgwKQXBwbGUg
-SW5jLjELMAkGA1UEBhMCVVMwHhcNMTMwMTEwMjIzOTAxWhcNMTgwMTExMjIzOTAx
-WjCBqDEaMBgGCgmSJomT8ixkAQEMClBCVjRHTFM5SjQxQDA+BgNVBAMMN0RldmVs
-b3BlciBJRCBBcHBsaWNhdGlvbjogQklUQ09JTiBGT1VOREFUSU9OLCBJTkMuLCBU
-SEUxEzARBgNVBAsMClBCVjRHTFM5SjQxJjAkBgNVBAoMHUJJVENPSU4gRk9VTkRB
-VElPTiwgSU5DLiwgVEhFMQswCQYDVQQGEwJVUzCCASIwDQYJKoZIhvcNAQEBBQAD
-ggEPADCCAQoCggEBALTd5zURuZVoJviusr119aktXksenb9IN9vq6kBbq38vxEk7
-9wkKMES2XfBRh0HxcEizGzhMNy5OCXuTLMaNMihYdfwYSoBoR2foEU+6kjPUnyJ4
-dQBFLJZJr5/QeQmALmYHEgZ6lwXFD2lU8t92340zeJ4y5LZw5pcEHtH9IummYDut
-OGCkCGXDcjL+5nHhNScJiXHhswM+62o6XXsQiP6EWbM1CsgrGTNLtaa0U/UvVDwE
-79YKklSC5Bog2LD0jBcTuveI66mFzqu++L9X9u+ZArtebwCl7BPNQ+uboYy5uV2d
-zf8lpNNZLfXCFjoLe9bLICKfZ7ub9V5aC8+GhckCAwEAAaOCAeEwggHdMD4GCCsG
-AQUFBwEBBDIwMDAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuYXBwbGUuY29tL29j
-c3AtZGV2aWQwMTAdBgNVHQ4EFgQUa5xsqKVzcHDiV6NJ2GL7l8elXV4wDAYDVR0T
-AQH/BAIwADAfBgNVHSMEGDAWgBRXF+2iz9x8mKEQ4Py+hy0s8uMXVDCCAQ4GA1Ud
-IASCAQUwggEBMIH+BgkqhkiG92NkBQEwgfAwKAYIKwYBBQUHAgEWHGh0dHA6Ly93
-d3cuYXBwbGUuY29tL2FwcGxlY2EwgcMGCCsGAQUFBwICMIG2DIGzUmVsaWFuY2Ug
-b24gdGhpcyBjZXJ0aWZpY2F0ZSBieSBhbnkgcGFydHkgYXNzdW1lcyBhY2NlcHRh
-bmNlIG9mIHRoZSB0aGVuIGFwcGxpY2FibGUgc3RhbmRhcmQgdGVybXMgYW5kIGNv
-bmRpdGlvbnMgb2YgdXNlLCBjZXJ0aWZpY2F0ZSBwb2xpY3kgYW5kIGNlcnRpZmlj
-YXRpb24gcHJhY3RpY2Ugc3RhdGVtZW50cy4wDgYDVR0PAQH/BAQDAgeAMBYGA1Ud
-JQEB/wQMMAoGCCsGAQUFBwMDMBMGCiqGSIb3Y2QGAQ0BAf8EAgUAMA0GCSqGSIb3
-DQEBCwUAA4IBAQAfJ0BjID/1dS2aEeVyhAzPzCBjG8vm0gDf+/qfwRn3+yWeL9vS
-nMdbilwM48IyQWTagjGGcojbsAd/vE4N7NhQyHInoCllNoeor1I5xx+blTaGRBK+
-dDhJbbdlGCjsLnH/BczGZi5fyEJds9lUIrp1hJidRcUKO76qb/9gc6qNZpl1vH5k
-lDUuJYt7YhAs+L6rTXDyqcK9maeQr0gaOPsRRAQLLwiQCorPeMTUNsbVMdMwZYJs
-R+PxiAnk+nyi7rfiFvPoASAYUuI6OzYL/Fa6QU4/gYyPgic944QYVkaQBnc0vEP1
-nXq6LGKwgVGcqJnkr/E2kui5gJoV5C3qll3e
------END CERTIFICATE-----
diff --git a/share/certs/BitcoinFoundation_Comodo_Cert.pem b/share/certs/BitcoinFoundation_Comodo_Cert.pem
deleted file mode 100644
index dc752d455..000000000
--- a/share/certs/BitcoinFoundation_Comodo_Cert.pem
+++ /dev/null
@@ -1,37 +0,0 @@
-Bag Attributes
-    friendlyName: The Bitcoin Foundation, Inc.'s COMODO CA Limited ID
-    localKeyID: 8C 94 64 E3 B5 B0 41 89 5B 89 B0 57 CC 74 B9 44 E5 B2 92 66 
-subject=/C=US/postalCode=98104-1444/ST=WA/L=Seattle/street=Suite 300/street=71 Columbia St/O=The Bitcoin Foundation, Inc./CN=The Bitcoin Foundation, Inc.
-issuer=/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO Code Signing CA 2
------BEGIN CERTIFICATE-----
-MIIFeDCCBGCgAwIBAgIRAJVYMd+waOER7lUqtiz3M2IwDQYJKoZIhvcNAQEFBQAw
-ezELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G
-A1UEBxMHU2FsZm9yZDEaMBgGA1UEChMRQ09NT0RPIENBIExpbWl0ZWQxITAfBgNV
-BAMTGENPTU9ETyBDb2RlIFNpZ25pbmcgQ0EgMjAeFw0xMzAxMTYwMDAwMDBaFw0x
-NDAxMTYyMzU5NTlaMIG8MQswCQYDVQQGEwJVUzETMBEGA1UEEQwKOTgxMDQtMTQ0
-NDELMAkGA1UECAwCV0ExEDAOBgNVBAcMB1NlYXR0bGUxEjAQBgNVBAkMCVN1aXRl
-IDMwMDEXMBUGA1UECQwONzEgQ29sdW1iaWEgU3QxJTAjBgNVBAoMHFRoZSBCaXRj
-b2luIEZvdW5kYXRpb24sIEluYy4xJTAjBgNVBAMMHFRoZSBCaXRjb2luIEZvdW5k
-YXRpb24sIEluYy4wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQChUwLD
-u/hu5aFZ/n11B27awONaaDrmHm0pamiWHb01yL4JmTBtaLCrSftF8RhCscQ8jpI0
-UG1Cchmay0e3zH5o5XRs0H9C3x+SM5ozms0TWDmAYiB8aQEghsGovDk0D2nyTQeK
-Q0xqyCh0m8ZPOnMnYrakHEmF6WvhLdJvI6Od4KIwbKxgN17cPFIfLVsZ7GrzmmbU
-Gdi4wSQCHy5rxzvBxho8Qq/SfBl93uOMUrqOHjOUAPhNuTJG3t/MdhU8Zp24s29M
-abHtYkT9W86hMjIiI8RTAR+WHKVglx9SB0cjDabXN8SZ3gME0+H++LyzlySHT8sI
-ykepojZ7UBRgp9w3AgMBAAGjggGzMIIBrzAfBgNVHSMEGDAWgBQexbEsfYfaAmh8
-JbwMB4Q/ts/e8TAdBgNVHQ4EFgQUfPf+ZyDWl/4LH0Y5BuJTelkRd/EwDgYDVR0P
-AQH/BAQDAgeAMAwGA1UdEwEB/wQCMAAwEwYDVR0lBAwwCgYIKwYBBQUHAwMwEQYJ
-YIZIAYb4QgEBBAQDAgQQMEYGA1UdIAQ/MD0wOwYMKwYBBAGyMQECAQMCMCswKQYI
-KwYBBQUHAgEWHWh0dHBzOi8vc2VjdXJlLmNvbW9kby5uZXQvQ1BTMEEGA1UdHwQ6
-MDgwNqA0oDKGMGh0dHA6Ly9jcmwuY29tb2RvY2EuY29tL0NPTU9ET0NvZGVTaWdu
-aW5nQ0EyLmNybDByBggrBgEFBQcBAQRmMGQwPAYIKwYBBQUHMAKGMGh0dHA6Ly9j
-cnQuY29tb2RvY2EuY29tL0NPTU9ET0NvZGVTaWduaW5nQ0EyLmNydDAkBggrBgEF
-BQcwAYYYaHR0cDovL29jc3AuY29tb2RvY2EuY29tMCgGA1UdEQQhMB+BHWxpbmRz
-YXlAYml0Y29pbmZvdW5kYXRpb24ub3JnMA0GCSqGSIb3DQEBBQUAA4IBAQAqibjo
-D4HG5XSIIMCmYE5RgQBSEAJfI+EZERk1G9F83ZUWr0yNRZCw4O+RaM7xQhvJhEoD
-G2kpk/q2bNOc71/VyZ6SrE1JRVUON41/Flhz4M6cP0BclTicXvh+efVwqZhIz+ws
-UxF2hvC/1Xx6rqI7NYAlOYXk2MSUq3HREo+gWUPKM8em4MZZV/7XCH4QbsfxOl1J
-xS6EOQmV8hfUN4KRXI5WfGUmedBxq7dM0RSJOSQl8fq2f+JjRLfjQwQucy7LDY+y
-pRTsL2TdQV/DuDuI3s0NHRGznQNddoX5jqpXhSQFAAdgrhN1gGkWaaTPzr9IF2TG
-qgr6PEp9tIYC+MbM
------END CERTIFICATE-----
diff --git a/share/certs/PrivateKeyNotes.md b/share/certs/PrivateKeyNotes.md
deleted file mode 100644
index 8d50144c2..000000000
--- a/share/certs/PrivateKeyNotes.md
+++ /dev/null
@@ -1,46 +0,0 @@
-Code-signing private key notes
-==
-
-The private keys for these certificates were generated on Gavin's main work machine,
-following the certificate authority's recommendations for generating certificate
-signing requests.
-
-For OSX, the private key was generated by Keychain.app on Gavin's main work machine.
-The key and certificate is in a separate, passphrase-protected keychain file that is
-unlocked to sign the Bitcoin-Qt.app bundle.
-
-For Windows, the private key was generated by Firefox running on Gavin's main work machine.
-The key and certificate were exported into a separate, passphrase-protected PKCS#12 file, and
-then deleted from Firefox's keystore. The exported file is used to sign the Windows setup.exe.
-
-Threat analysis
---
-
-Gavin is a single point of failure. He could be coerced to divulge the secret signing keys,
-allowing somebody to distribute a Bitcoin-Qt.app or bitcoin-qt-setup.exe with a valid
-signature but containing a malicious binary.
-
-Or the machine Gavin uses to sign the binaries could be compromised, either remotely or
-by breaking in to his office, allowing the attacker to get the private key files and then
-install a keylogger to get the passphrase that protects them.
-
-Threat Mitigation
---
-
-"Air gapping" the machine used to do the signing will not work, because the signing
-process needs to access a timestamp server over the network. And it would not
-prevent the "rubber hose cryptography" threat (coercing Gavin to sign a bad binary
-or divulge the private keys).
-
-Windows binaries are reproducibly 'gitian-built', and the setup.exe file created
-by the NSIS installer system is a 7zip archive, so you could check to make sure
-that the bitcoin-qt.exe file inside the installer had not been tampered with.
-However, an attacker could modify the installer's code, so when the setup.exe
-was run it compromised users' systems. A volunteer to write an auditing tool
-that checks the setup.exe for tampering, and checks the files in it against
-the list of gitian signatures, is needed.
-
-The long-term solution is something like the 'gitian downloader' system, which
-uses signatures from multiple developers to determine whether or not a binary
-should be trusted. However, that just pushes the problem to "how will
-non-technical users securely get the gitian downloader code to start?"
diff --git a/share/qt/extract_strings_qt.py b/share/qt/extract_strings_qt.py
index 5492fdb8c..e3be18205 100755
--- a/share/qt/extract_strings_qt.py
+++ b/share/qt/extract_strings_qt.py
@@ -58,7 +58,7 @@ def parse_po(text):
 if not XGETTEXT:
     print('Cannot extract strings: xgettext utility is not installed or not configured.',file=sys.stderr)
     print('Please install package "gettext" and re-run \'./configure\'.',file=sys.stderr)
-    exit(1)
+    sys.exit(1)
 child = Popen([XGETTEXT,'--output=-','-n','--keyword=_'] + files, stdout=PIPE)
 (out, err) = child.communicate()
 
diff --git a/src/Makefile.am b/src/Makefile.am
index cab098468..74e6a8dd7 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -18,7 +18,6 @@ else
 LIBUNIVALUE = $(UNIVALUE_LIBS)
 endif
 
-BITCOIN_CONFIG_INCLUDES=-I$(builddir)/config
 BITCOIN_INCLUDES=-I$(builddir) -I$(builddir)/obj $(BDB_CPPFLAGS) $(BOOST_CPPFLAGS) $(LEVELDB_CPPFLAGS) $(CRYPTO_CFLAGS) $(SSL_CFLAGS)
 
 BITCOIN_INCLUDES += -I$(srcdir)/secp256k1/include
@@ -79,6 +78,7 @@ BITCOIN_CORE_H = \
   addrdb.h \
   addrman.h \
   base58.h \
+  bech32.h \
   bloom.h \
   blockencodings.h \
   chain.h \
@@ -130,6 +130,7 @@ BITCOIN_CORE_H = \
   rpc/client.h \
   rpc/mining.h \
   rpc/protocol.h \
+  rpc/safemode.h \
   rpc/server.h \
   rpc/register.h \
   scheduler.h \
@@ -162,6 +163,8 @@ BITCOIN_CORE_H = \
   wallet/crypter.h \
   wallet/db.h \
   wallet/feebumper.h \
+  wallet/fees.h \
+  wallet/init.h \
   wallet/rpcwallet.h \
   wallet/wallet.h \
   wallet/walletdb.h \
@@ -208,6 +211,7 @@ libbitcoin_server_a_SOURCES = \
   rpc/misc.cpp \
   rpc/net.cpp \
   rpc/rawtransaction.cpp \
+  rpc/safemode.cpp \
   rpc/server.cpp \
   script/sigcache.cpp \
   script/ismine.cpp \
@@ -239,6 +243,8 @@ libbitcoin_wallet_a_SOURCES = \
   wallet/crypter.cpp \
   wallet/db.cpp \
   wallet/feebumper.cpp \
+  wallet/fees.cpp \
+  wallet/init.cpp \
   wallet/rpcdump.cpp \
   wallet/rpcwallet.cpp \
   wallet/wallet.cpp \
@@ -246,7 +252,7 @@ libbitcoin_wallet_a_SOURCES = \
   $(BITCOIN_CORE_H)
 
 # crypto primitives library
-crypto_libbitcoin_crypto_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_CONFIG_INCLUDES)
+crypto_libbitcoin_crypto_a_CPPFLAGS = $(AM_CPPFLAGS)
 crypto_libbitcoin_crypto_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 crypto_libbitcoin_crypto_a_SOURCES = \
   crypto/aes.cpp \
@@ -267,7 +273,7 @@ crypto_libbitcoin_crypto_a_SOURCES = \
   crypto/sha512.cpp \
   crypto/sha512.h
 
-if EXPERIMENTAL_ASM
+if USE_ASM
 crypto_libbitcoin_crypto_a_SOURCES += crypto/sha256_sse4.cpp
 endif
 
@@ -311,6 +317,7 @@ libbitcoin_common_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
 libbitcoin_common_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_common_a_SOURCES = \
   base58.cpp \
+  bech32.cpp \
   chainparams.cpp \
   coins.cpp \
   compressor.cpp \
@@ -469,8 +476,7 @@ CLEANFILES += univalue/*.gcda univalue/*.gcno
 CLEANFILES += wallet/*.gcda wallet/*.gcno
 CLEANFILES += wallet/test/*.gcda wallet/test/*.gcno
 CLEANFILES += zmq/*.gcda zmq/*.gcno
-
-DISTCLEANFILES = obj/build.h
+CLEANFILES += obj/build.h
 
 EXTRA_DIST = $(CTAES_DIST)
 
@@ -494,10 +500,6 @@ clean-local:
 	## FIXME: How to get the appropriate modulename_CPPFLAGS in here?
 	$(AM_V_GEN) $(WINDRES) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(CPPFLAGS) -DWINDRES_PREPROC -i $< -o $@
 
-.mm.o:
-	$(AM_V_CXX) $(OBJCXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
-	  $(CPPFLAGS) $(AM_CXXFLAGS) $(QT_INCLUDES) $(AM_CXXFLAGS) $(PIE_FLAGS) $(CXXFLAGS) -c -o $@ $<
-
 check-symbols: $(bin_PROGRAMS)
 if GLIBC_BACK_COMPAT
 	@echo "Checking glibc back compat..."
diff --git a/src/Makefile.bench.include b/src/Makefile.bench.include
index 2b1f70b25..8e2e587d3 100644
--- a/src/Makefile.bench.include
+++ b/src/Makefile.bench.include
@@ -6,11 +6,12 @@ bin_PROGRAMS += bench/bench_bitcoin
 BENCH_SRCDIR = bench
 BENCH_BINARY = bench/bench_bitcoin$(EXEEXT)
 
-RAW_TEST_FILES = \
+RAW_BENCH_FILES = \
   bench/data/block413567.raw
-GENERATED_TEST_FILES = $(RAW_TEST_FILES:.raw=.raw.h)
+GENERATED_BENCH_FILES = $(RAW_BENCH_FILES:.raw=.raw.h)
 
 bench_bench_bitcoin_SOURCES = \
+  $(RAW_BENCH_FILES) \
   bench/bench_bitcoin.cpp \
   bench/bench.cpp \
   bench/bench.h \
@@ -28,7 +29,7 @@ bench_bench_bitcoin_SOURCES = \
   bench/perf.h \
   bench/prevector_destructor.cpp
 
-nodist_bench_bench_bitcoin_SOURCES = $(GENERATED_TEST_FILES)
+nodist_bench_bench_bitcoin_SOURCES = $(GENERATED_BENCH_FILES)
 
 bench_bench_bitcoin_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(EVENT_CLFAGS) $(EVENT_PTHREADS_CFLAGS) -I$(builddir)/bench/
 bench_bench_bitcoin_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
@@ -56,7 +57,7 @@ endif
 bench_bench_bitcoin_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(SSL_LIBS) $(CRYPTO_LIBS) $(MINIUPNPC_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS)
 bench_bench_bitcoin_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
 
-CLEAN_BITCOIN_BENCH = bench/*.gcda bench/*.gcno $(GENERATED_TEST_FILES)
+CLEAN_BITCOIN_BENCH = bench/*.gcda bench/*.gcno $(GENERATED_BENCH_FILES)
 
 CLEANFILES += $(CLEAN_BITCOIN_BENCH)
 
diff --git a/src/Makefile.qt.include b/src/Makefile.qt.include
index e4b64c1ca..0767ee130 100644
--- a/src/Makefile.qt.include
+++ b/src/Makefile.qt.include
@@ -368,6 +368,7 @@ BITCOIN_QT_INCLUDES = -I$(builddir)/qt -I$(srcdir)/qt -I$(srcdir)/qt/forms \
 qt_libbitcoinqt_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(BITCOIN_QT_INCLUDES) \
   $(QT_INCLUDES) $(QT_DBUS_INCLUDES) $(PROTOBUF_CFLAGS) $(QR_CFLAGS)
 qt_libbitcoinqt_a_CXXFLAGS = $(AM_CXXFLAGS) $(QT_PIE_FLAGS)
+qt_libbitcoinqt_a_OBJCXXFLAGS = $(AM_OBJCXXFLAGS) $(QT_PIE_FLAGS)
 
 qt_libbitcoinqt_a_SOURCES = $(BITCOIN_QT_CPP) $(BITCOIN_QT_H) $(QT_FORMS_UI) \
   $(QT_QRC) $(QT_QRC_LOCALE) $(QT_TS) $(PROTOBUF_PROTO) $(RES_ICONS) $(RES_IMAGES) $(RES_MOVIES)
diff --git a/src/Makefile.qttest.include b/src/Makefile.qttest.include
index 02f30bc95..ea2ed1747 100644
--- a/src/Makefile.qttest.include
+++ b/src/Makefile.qttest.include
@@ -25,12 +25,10 @@ TEST_QT_H = \
   qt/test/wallettests.h
 
 TEST_BITCOIN_CPP = \
-  test/test_bitcoin.cpp \
-  test/testutil.cpp
+  test/test_bitcoin.cpp
 
 TEST_BITCOIN_H = \
-  test/test_bitcoin.h \
-  test/testutil.h
+  test/test_bitcoin.h
 
 qt_test_test_bitcoin_qt_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(BITCOIN_QT_INCLUDES) \
   $(QT_INCLUDES) $(QT_TEST_INCLUDES) $(PROTOBUF_CFLAGS)
diff --git a/src/Makefile.test.include b/src/Makefile.test.include
index 6415b3d2e..d3e7b5da1 100644
--- a/src/Makefile.test.include
+++ b/src/Makefile.test.include
@@ -31,6 +31,7 @@ BITCOIN_TESTS =\
   test/base32_tests.cpp \
   test/base58_tests.cpp \
   test/base64_tests.cpp \
+  test/bech32_tests.cpp \
   test/bip32_tests.cpp \
   test/blockencodings_tests.cpp \
   test/bloom_tests.cpp \
@@ -49,6 +50,7 @@ BITCOIN_TESTS =\
   test/main_tests.cpp \
   test/mempool_tests.cpp \
   test/merkle_tests.cpp \
+  test/merkleblock_tests.cpp \
   test/miner_tests.cpp \
   test/multisig_tests.cpp \
   test/net_tests.cpp \
@@ -65,6 +67,7 @@ BITCOIN_TESTS =\
   test/scheduler_tests.cpp \
   test/script_P2SH_tests.cpp \
   test/script_tests.cpp \
+  test/script_standard_tests.cpp \
   test/scriptnum_tests.cpp \
   test/serialize_tests.cpp \
   test/sighash_tests.cpp \
@@ -74,8 +77,6 @@ BITCOIN_TESTS =\
   test/test_bitcoin.cpp \
   test/test_bitcoin.h \
   test/test_bitcoin_main.cpp \
-  test/testutil.cpp \
-  test/testutil.h \
   test/timedata_tests.cpp \
   test/torcontrol_tests.cpp \
   test/transaction_tests.cpp \
@@ -148,7 +149,7 @@ bitcoin_test_clean : FORCE
 
 check-local:
 	@echo "Running test/util/bitcoin-util-test.py..."
-	$(top_builddir)/test/util/bitcoin-util-test.py
+	$(PYTHON) $(top_builddir)/test/util/bitcoin-util-test.py
 	$(AM_V_at)$(MAKE) $(AM_MAKEFLAGS) -C secp256k1 check
 if EMBEDDED_UNIVALUE
 	$(AM_V_at)$(MAKE) $(AM_MAKEFLAGS) -C univalue check
diff --git a/src/addrdb.h b/src/addrdb.h
index 6cb36dfac..d930de204 100644
--- a/src/addrdb.h
+++ b/src/addrdb.h
@@ -37,7 +37,7 @@ class CBanEntry
         SetNull();
     }
 
-    CBanEntry(int64_t nCreateTimeIn)
+    explicit CBanEntry(int64_t nCreateTimeIn)
     {
         SetNull();
         nCreateTime = nCreateTimeIn;
@@ -61,7 +61,7 @@ class CBanEntry
         banReason = BanReasonUnknown;
     }
 
-    std::string banReasonToString()
+    std::string banReasonToString() const
     {
         switch (banReason) {
         case BanReasonNodeMisbehaving:
diff --git a/src/addrman.cpp b/src/addrman.cpp
index 4a408b9be..a56bb4f9c 100644
--- a/src/addrman.cpp
+++ b/src/addrman.cpp
@@ -69,13 +69,13 @@ CAddrInfo* CAddrMan::Find(const CNetAddr& addr, int* pnId)
 {
     std::map<CNetAddr, int>::iterator it = mapAddr.find(addr);
     if (it == mapAddr.end())
-        return NULL;
+        return nullptr;
     if (pnId)
         *pnId = (*it).second;
     std::map<int, CAddrInfo>::iterator it2 = mapInfo.find((*it).second);
     if (it2 != mapInfo.end())
         return &(*it2).second;
-    return NULL;
+    return nullptr;
 }
 
 CAddrInfo* CAddrMan::Create(const CAddress& addr, const CNetAddr& addrSource, int* pnId)
diff --git a/src/addrman.h b/src/addrman.h
index 70d907488..18f306228 100644
--- a/src/addrman.h
+++ b/src/addrman.h
@@ -220,11 +220,11 @@ class CAddrMan
     FastRandomContext insecure_rand;
 
     //! Find an entry.
-    CAddrInfo* Find(const CNetAddr& addr, int *pnId = NULL);
+    CAddrInfo* Find(const CNetAddr& addr, int *pnId = nullptr);
 
     //! find an entry, creating it if necessary.
     //! nTime and nServices of the found node are updated, if necessary.
-    CAddrInfo* Create(const CAddress &addr, const CNetAddr &addrSource, int *pnId = NULL);
+    CAddrInfo* Create(const CAddress &addr, const CNetAddr &addrSource, int *pnId = nullptr);
 
     //! Swap two elements in vRandom.
     void SwapRandom(unsigned int nRandomPos1, unsigned int nRandomPos2);
@@ -472,6 +472,8 @@ class CAddrMan
         nTried = 0;
         nNew = 0;
         nLastGood = 1; //Initially at 1 so that "never" is strictly worse.
+        mapInfo.clear();
+        mapAddr.clear();
     }
 
     CAddrMan()
diff --git a/src/arith_uint256.h b/src/arith_uint256.h
index c7734035d..5fd4fe96c 100644
--- a/src/arith_uint256.h
+++ b/src/arith_uint256.h
@@ -250,7 +250,7 @@ class base_uint
 
     uint64_t GetLow64() const
     {
-        assert(WIDTH >= 2);
+        static_assert(WIDTH >= 2, "Assertion WIDTH >= 2 failed (WIDTH = BITS / 32). BITS is a template parameter.");
         return pn[0] | (uint64_t)pn[1] << 32;
     }
 };
@@ -283,7 +283,7 @@ class arith_uint256 : public base_uint<256> {
      * complexities of the sign bit and using base 256 are probably an
      * implementation accident.
      */
-    arith_uint256& SetCompact(uint32_t nCompact, bool *pfNegative = NULL, bool *pfOverflow = NULL);
+    arith_uint256& SetCompact(uint32_t nCompact, bool *pfNegative = nullptr, bool *pfOverflow = nullptr);
     uint32_t GetCompact(bool fNegative = false) const;
 
     friend uint256 ArithToUint256(const arith_uint256 &);
diff --git a/src/base58.cpp b/src/base58.cpp
index 17022a6bc..9d5a2f496 100644
--- a/src/base58.cpp
+++ b/src/base58.cpp
@@ -4,17 +4,20 @@
 
 #include "base58.h"
 
+#include "bech32.h"
 #include "hash.h"
+#include "script/script.h"
 #include "uint256.h"
+#include "utilstrencodings.h"
 
-#include <assert.h>
-#include <stdint.h>
-#include <string.h>
-#include <vector>
-#include <string>
 #include <boost/variant/apply_visitor.hpp>
 #include <boost/variant/static_visitor.hpp>
 
+#include <algorithm>
+#include <assert.h>
+#include <string.h>
+
+
 /** All alphanumeric characters except for "0", "I", "O", and "l" */
 static const char* pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
 
@@ -37,7 +40,7 @@ bool DecodeBase58(const char* psz, std::vector<unsigned char>& vch)
     while (*psz && !isspace(*psz)) {
         // Decode base58 character
         const char* ch = strchr(pszBase58, *psz);
-        if (ch == NULL)
+        if (ch == nullptr)
             return false;
         // Apply "b256 = b256 * 58 + ch".
         int carry = ch - pszBase58;
@@ -136,7 +139,7 @@ bool DecodeBase58Check(const char* psz, std::vector<unsigned char>& vchRet)
     }
     // re-calculate the checksum, ensure it matches the included 4-byte checksum
     uint256 hash = Hash(vchRet.begin(), vchRet.end() - 4);
-    if (memcmp(&hash, &vchRet.end()[-4], 4) != 0) {
+    if (memcmp(&hash, &vchRet[vchRet.size() - 4], 4) != 0) {
         vchRet.clear();
         return false;
     }
@@ -212,79 +215,113 @@ int CBase58Data::CompareTo(const CBase58Data& b58) const
 
 namespace
 {
-class CBitcoinAddressVisitor : public boost::static_visitor<bool>
+class DestinationEncoder : public boost::static_visitor<std::string>
 {
 private:
-    CBitcoinAddress* addr;
+    const CChainParams& m_params;
 
 public:
-    CBitcoinAddressVisitor(CBitcoinAddress* addrIn) : addr(addrIn) {}
-
-    bool operator()(const CKeyID& id) const { return addr->Set(id); }
-    bool operator()(const CScriptID& id) const { return addr->Set(id); }
-    bool operator()(const CNoDestination& no) const { return false; }
-};
-
-} // namespace
-
-bool CBitcoinAddress::Set(const CKeyID& id)
-{
-    SetData(Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS), &id, 20);
-    return true;
-}
+    DestinationEncoder(const CChainParams& params) : m_params(params) {}
 
-bool CBitcoinAddress::Set(const CScriptID& id)
-{
-    SetData(Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS), &id, 20);
-    return true;
-}
+    std::string operator()(const CKeyID& id) const
+    {
+        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
+        data.insert(data.end(), id.begin(), id.end());
+        return EncodeBase58Check(data);
+    }
 
-bool CBitcoinAddress::Set(const CTxDestination& dest)
-{
-    return boost::apply_visitor(CBitcoinAddressVisitor(this), dest);
-}
+    std::string operator()(const CScriptID& id) const
+    {
+        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
+        data.insert(data.end(), id.begin(), id.end());
+        return EncodeBase58Check(data);
+    }
 
-bool CBitcoinAddress::IsValid() const
-{
-    return IsValid(Params());
-}
+    std::string operator()(const WitnessV0KeyHash& id) const
+    {
+        std::vector<unsigned char> data = {0};
+        ConvertBits<8, 5, true>(data, id.begin(), id.end());
+        return bech32::Encode(m_params.Bech32HRP(), data);
+    }
 
-bool CBitcoinAddress::IsValid(const CChainParams& params) const
-{
-    bool fCorrectSize = vchData.size() == 20;
-    bool fKnownVersion = vchVersion == params.Base58Prefix(CChainParams::PUBKEY_ADDRESS) ||
-                         vchVersion == params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
-    return fCorrectSize && fKnownVersion;
-}
+    std::string operator()(const WitnessV0ScriptHash& id) const
+    {
+        std::vector<unsigned char> data = {0};
+        ConvertBits<8, 5, true>(data, id.begin(), id.end());
+        return bech32::Encode(m_params.Bech32HRP(), data);
+    }
 
-CTxDestination CBitcoinAddress::Get() const
-{
-    if (!IsValid())
-        return CNoDestination();
-    uint160 id;
-    memcpy(&id, vchData.data(), 20);
-    if (vchVersion == Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS))
-        return CKeyID(id);
-    else if (vchVersion == Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS))
-        return CScriptID(id);
-    else
-        return CNoDestination();
-}
+    std::string operator()(const WitnessUnknown& id) const
+    {
+        if (id.version < 1 || id.version > 16 || id.length < 2 || id.length > 40) {
+            return {};
+        }
+        std::vector<unsigned char> data = {(unsigned char)id.version};
+        ConvertBits<8, 5, true>(data, id.program, id.program + id.length);
+        return bech32::Encode(m_params.Bech32HRP(), data);
+    }
 
-bool CBitcoinAddress::GetKeyID(CKeyID& keyID) const
-{
-    if (!IsValid() || vchVersion != Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS))
-        return false;
-    uint160 id;
-    memcpy(&id, vchData.data(), 20);
-    keyID = CKeyID(id);
-    return true;
-}
+    std::string operator()(const CNoDestination& no) const { return {}; }
+};
 
-bool CBitcoinAddress::IsScript() const
+CTxDestination DecodeDestination(const std::string& str, const CChainParams& params)
 {
-    return IsValid() && vchVersion == Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS);
+    std::vector<unsigned char> data;
+    uint160 hash;
+    if (DecodeBase58Check(str, data)) {
+        // base58-encoded Bitcoin addresses.
+        // Public-key-hash-addresses have version 0 (or 111 testnet).
+        // The data vector contains RIPEMD160(SHA256(pubkey)), where pubkey is the serialized public key.
+        const std::vector<unsigned char>& pubkey_prefix = params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
+        if (data.size() == hash.size() + pubkey_prefix.size() && std::equal(pubkey_prefix.begin(), pubkey_prefix.end(), data.begin())) {
+            std::copy(data.begin() + pubkey_prefix.size(), data.end(), hash.begin());
+            return CKeyID(hash);
+        }
+        // Script-hash-addresses have version 5 (or 196 testnet).
+        // The data vector contains RIPEMD160(SHA256(cscript)), where cscript is the serialized redemption script.
+        const std::vector<unsigned char>& script_prefix = params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
+        if (data.size() == hash.size() + script_prefix.size() && std::equal(script_prefix.begin(), script_prefix.end(), data.begin())) {
+            std::copy(data.begin() + script_prefix.size(), data.end(), hash.begin());
+            return CScriptID(hash);
+        }
+    }
+    data.clear();
+    auto bech = bech32::Decode(str);
+    if (bech.second.size() > 0 && bech.first == params.Bech32HRP()) {
+        // Bech32 decoding
+        int version = bech.second[0]; // The first 5 bit symbol is the witness version (0-16)
+        // The rest of the symbols are converted witness program bytes.
+        if (ConvertBits<5, 8, false>(data, bech.second.begin() + 1, bech.second.end())) {
+            if (version == 0) {
+                {
+                    WitnessV0KeyHash keyid;
+                    if (data.size() == keyid.size()) {
+                        std::copy(data.begin(), data.end(), keyid.begin());
+                        return keyid;
+                    }
+                }
+                {
+                    WitnessV0ScriptHash scriptid;
+                    if (data.size() == scriptid.size()) {
+                        std::copy(data.begin(), data.end(), scriptid.begin());
+                        return scriptid;
+                    }
+                }
+                return CNoDestination();
+            }
+            if (version > 16 || data.size() < 2 || data.size() > 40) {
+                return CNoDestination();
+            }
+            WitnessUnknown unk;
+            unk.version = version;
+            std::copy(data.begin(), data.end(), unk.program);
+            unk.length = data.size();
+            return unk;
+        }
+    }
+    return CNoDestination();
 }
+} // namespace
 
 void CBitcoinSecret::SetKey(const CKey& vchSecret)
 {
@@ -318,3 +355,23 @@ bool CBitcoinSecret::SetString(const std::string& strSecret)
 {
     return SetString(strSecret.c_str());
 }
+
+std::string EncodeDestination(const CTxDestination& dest)
+{
+    return boost::apply_visitor(DestinationEncoder(Params()), dest);
+}
+
+CTxDestination DecodeDestination(const std::string& str)
+{
+    return DecodeDestination(str, Params());
+}
+
+bool IsValidDestinationString(const std::string& str, const CChainParams& params)
+{
+    return IsValidDestination(DecodeDestination(str, params));
+}
+
+bool IsValidDestinationString(const std::string& str)
+{
+    return IsValidDestinationString(str, Params());
+}
diff --git a/src/base58.h b/src/base58.h
index 4de5cc6ce..9dc423424 100644
--- a/src/base58.h
+++ b/src/base58.h
@@ -17,7 +17,6 @@
 #include "chainparams.h"
 #include "key.h"
 #include "pubkey.h"
-#include "script/script.h"
 #include "script/standard.h"
 #include "support/allocators/zeroafterfree.h"
 
@@ -26,7 +25,7 @@
 
 /**
  * Encode a byte sequence as a base58-encoded string.
- * pbegin and pend cannot be NULL, unless both are.
+ * pbegin and pend cannot be nullptr, unless both are.
  */
 std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend);
 
@@ -38,7 +37,7 @@ std::string EncodeBase58(const std::vector<unsigned char>& vch);
 /**
  * Decode a base58-encoded string (psz) into a byte vector (vchRet).
  * return true if decoding is successful.
- * psz cannot be NULL.
+ * psz cannot be nullptr.
  */
 bool DecodeBase58(const char* psz, std::vector<unsigned char>& vchRet);
 
@@ -95,30 +94,6 @@ class CBase58Data
     bool operator> (const CBase58Data& b58) const { return CompareTo(b58) >  0; }
 };
 
-/** base58-encoded Bitcoin addresses.
- * Public-key-hash-addresses have version 0 (or 111 testnet).
- * The data vector contains RIPEMD160(SHA256(pubkey)), where pubkey is the serialized public key.
- * Script-hash-addresses have version 5 (or 196 testnet).
- * The data vector contains RIPEMD160(SHA256(cscript)), where cscript is the serialized redemption script.
- */
-class CBitcoinAddress : public CBase58Data {
-public:
-    bool Set(const CKeyID &id);
-    bool Set(const CScriptID &id);
-    bool Set(const CTxDestination &dest);
-    bool IsValid() const;
-    bool IsValid(const CChainParams &params) const;
-
-    CBitcoinAddress() {}
-    CBitcoinAddress(const CTxDestination &dest) { Set(dest); }
-    CBitcoinAddress(const std::string& strAddress) { SetString(strAddress); }
-    CBitcoinAddress(const char* pszAddress) { SetString(pszAddress); }
-
-    CTxDestination Get() const;
-    bool GetKeyID(CKeyID &keyID) const;
-    bool IsScript() const;
-};
-
 /**
  * A base58-encoded secret key
  */
@@ -167,4 +142,9 @@ template<typename K, int Size, CChainParams::Base58Type Type> class CBitcoinExtK
 typedef CBitcoinExtKeyBase<CExtKey, BIP32_EXTKEY_SIZE, CChainParams::EXT_SECRET_KEY> CBitcoinExtKey;
 typedef CBitcoinExtKeyBase<CExtPubKey, BIP32_EXTKEY_SIZE, CChainParams::EXT_PUBLIC_KEY> CBitcoinExtPubKey;
 
+std::string EncodeDestination(const CTxDestination& dest);
+CTxDestination DecodeDestination(const std::string& str);
+bool IsValidDestinationString(const std::string& str);
+bool IsValidDestinationString(const std::string& str, const CChainParams& params);
+
 #endif // BITCOIN_BASE58_H
diff --git a/src/bech32.cpp b/src/bech32.cpp
new file mode 100644
index 000000000..573eac58b
--- /dev/null
+++ b/src/bech32.cpp
@@ -0,0 +1,191 @@
+// Copyright (c) 2017 Pieter Wuille
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "bech32.h"
+
+namespace
+{
+
+typedef std::vector<uint8_t> data;
+
+/** The Bech32 character set for encoding. */
+const char* CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
+
+/** The Bech32 character set for decoding. */
+const int8_t CHARSET_REV[128] = {
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    15, -1, 10, 17, 21, 20, 26, 30,  7,  5, -1, -1, -1, -1, -1, -1,
+    -1, 29, -1, 24, 13, 25,  9,  8, 23, -1, 18, 22, 31, 27, 19, -1,
+     1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1,
+    -1, 29, -1, 24, 13, 25,  9,  8, 23, -1, 18, 22, 31, 27, 19, -1,
+     1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1
+};
+
+/** Concatenate two byte arrays. */
+data Cat(data x, const data& y)
+{
+    x.insert(x.end(), y.begin(), y.end());
+    return x;
+}
+
+/** This function will compute what 6 5-bit values to XOR into the last 6 input values, in order to
+ *  make the checksum 0. These 6 values are packed together in a single 30-bit integer. The higher
+ *  bits correspond to earlier values. */
+uint32_t PolyMod(const data& v)
+{
+    // The input is interpreted as a list of coefficients of a polynomial over F = GF(32), with an
+    // implicit 1 in front. If the input is [v0,v1,v2,v3,v4], that polynomial is v(x) =
+    // 1*x^5 + v0*x^4 + v1*x^3 + v2*x^2 + v3*x + v4. The implicit 1 guarantees that
+    // [v0,v1,v2,...] has a distinct checksum from [0,v0,v1,v2,...].
+
+    // The output is a 30-bit integer whose 5-bit groups are the coefficients of the remainder of
+    // v(x) mod g(x), where g(x) is the Bech32 generator,
+    // x^6 + {29}x^5 + {22}x^4 + {20}x^3 + {21}x^2 + {29}x + {18}. g(x) is chosen in such a way
+    // that the resulting code is a BCH code, guaranteeing detection of up to 3 errors within a
+    // window of 1023 characters. Among the various possible BCH codes, one was selected to in
+    // fact guarantee detection of up to 4 errors within a window of 89 characters.
+
+    // Note that the coefficients are elements of GF(32), here represented as decimal numbers
+    // between {}. In this finite field, addition is just XOR of the corresponding numbers. For
+    // example, {27} + {13} = {27 ^ 13} = {22}. Multiplication is more complicated, and requires
+    // treating the bits of values themselves as coefficients of a polynomial over a smaller field,
+    // GF(2), and multiplying those polynomials mod a^5 + a^3 + 1. For example, {5} * {26} =
+    // (a^2 + 1) * (a^4 + a^3 + a) = (a^4 + a^3 + a) * a^2 + (a^4 + a^3 + a) = a^6 + a^5 + a^4 + a
+    // = a^3 + 1 (mod a^5 + a^3 + 1) = {9}.
+
+    // During the course of the loop below, `c` contains the bitpacked coefficients of the
+    // polynomial constructed from just the values of v that were processed so far, mod g(x). In
+    // the above example, `c` initially corresponds to 1 mod (x), and after processing 2 inputs of
+    // v, it corresponds to x^2 + v0*x + v1 mod g(x). As 1 mod g(x) = 1, that is the starting value
+    // for `c`.
+    uint32_t c = 1;
+    for (auto v_i : v) {
+        // We want to update `c` to correspond to a polynomial with one extra term. If the initial
+        // value of `c` consists of the coefficients of c(x) = f(x) mod g(x), we modify it to
+        // correspond to c'(x) = (f(x) * x + v_i) mod g(x), where v_i is the next input to
+        // process. Simplifying:
+        // c'(x) = (f(x) * x + v_i) mod g(x)
+        //         ((f(x) mod g(x)) * x + v_i) mod g(x)
+        //         (c(x) * x + v_i) mod g(x)
+        // If c(x) = c0*x^5 + c1*x^4 + c2*x^3 + c3*x^2 + c4*x + c5, we want to compute
+        // c'(x) = (c0*x^5 + c1*x^4 + c2*x^3 + c3*x^2 + c4*x + c5) * x + v_i mod g(x)
+        //       = c0*x^6 + c1*x^5 + c2*x^4 + c3*x^3 + c4*x^2 + c5*x + v_i mod g(x)
+        //       = c0*(x^6 mod g(x)) + c1*x^5 + c2*x^4 + c3*x^3 + c4*x^2 + c5*x + v_i
+        // If we call (x^6 mod g(x)) = k(x), this can be written as
+        // c'(x) = (c1*x^5 + c2*x^4 + c3*x^3 + c4*x^2 + c5*x + v_i) + c0*k(x)
+
+        // First, determine the value of c0:
+        uint8_t c0 = c >> 25;
+
+        // Then compute c1*x^5 + c2*x^4 + c3*x^3 + c4*x^2 + c5*x + v_i:
+        c = ((c & 0x1ffffff) << 5) ^ v_i;
+
+        // Finally, for each set bit n in c0, conditionally add {2^n}k(x):
+        if (c0 & 1)  c ^= 0x3b6a57b2; //     k(x) = {29}x^5 + {22}x^4 + {20}x^3 + {21}x^2 + {29}x + {18}
+        if (c0 & 2)  c ^= 0x26508e6d; //  {2}k(x) = {19}x^5 +  {5}x^4 +     x^3 +  {3}x^2 + {19}x + {13}
+        if (c0 & 4)  c ^= 0x1ea119fa; //  {4}k(x) = {15}x^5 + {10}x^4 +  {2}x^3 +  {6}x^2 + {15}x + {26}
+        if (c0 & 8)  c ^= 0x3d4233dd; //  {8}k(x) = {30}x^5 + {20}x^4 +  {4}x^3 + {12}x^2 + {30}x + {29}
+        if (c0 & 16) c ^= 0x2a1462b3; // {16}k(x) = {21}x^5 +     x^4 +  {8}x^3 + {24}x^2 + {21}x + {19}
+    }
+    return c;
+}
+
+/** Convert to lower case. */
+inline unsigned char LowerCase(unsigned char c)
+{
+    return (c >= 'A' && c <= 'Z') ? (c - 'A') + 'a' : c;
+}
+
+/** Expand a HRP for use in checksum computation. */
+data ExpandHRP(const std::string& hrp)
+{
+    data ret;
+    ret.reserve(hrp.size() + 90);
+    ret.resize(hrp.size() * 2 + 1);
+    for (size_t i = 0; i < hrp.size(); ++i) {
+        unsigned char c = hrp[i];
+        ret[i] = c >> 5;
+        ret[i + hrp.size() + 1] = c & 0x1f;
+    }
+    ret[hrp.size()] = 0;
+    return ret;
+}
+
+/** Verify a checksum. */
+bool VerifyChecksum(const std::string& hrp, const data& values)
+{
+    // PolyMod computes what value to xor into the final values to make the checksum 0. However,
+    // if we required that the checksum was 0, it would be the case that appending a 0 to a valid
+    // list of values would result in a new valid list. For that reason, Bech32 requires the
+    // resulting checksum to be 1 instead.
+    return PolyMod(Cat(ExpandHRP(hrp), values)) == 1;
+}
+
+/** Create a checksum. */
+data CreateChecksum(const std::string& hrp, const data& values)
+{
+    data enc = Cat(ExpandHRP(hrp), values);
+    enc.resize(enc.size() + 6); // Append 6 zeroes
+    uint32_t mod = PolyMod(enc) ^ 1; // Determine what to XOR into those 6 zeroes.
+    data ret(6);
+    for (size_t i = 0; i < 6; ++i) {
+        // Convert the 5-bit groups in mod to checksum values.
+        ret[i] = (mod >> (5 * (5 - i))) & 31;
+    }
+    return ret;
+}
+
+} // namespace
+
+namespace bech32
+{
+
+/** Encode a Bech32 string. */
+std::string Encode(const std::string& hrp, const data& values) {
+    data checksum = CreateChecksum(hrp, values);
+    data combined = Cat(values, checksum);
+    std::string ret = hrp + '1';
+    ret.reserve(ret.size() + combined.size());
+    for (auto c : combined) {
+        ret += CHARSET[c];
+    }
+    return ret;
+}
+
+/** Decode a Bech32 string. */
+std::pair<std::string, data> Decode(const std::string& str) {
+    bool lower = false, upper = false;
+    for (size_t i = 0; i < str.size(); ++i) {
+        unsigned char c = str[i];
+        if (c < 33 || c > 126) return {};
+        if (c >= 'a' && c <= 'z') lower = true;
+        if (c >= 'A' && c <= 'Z') upper = true;
+    }
+    if (lower && upper) return {};
+    size_t pos = str.rfind('1');
+    if (str.size() > 90 || pos == str.npos || pos == 0 || pos + 7 > str.size()) {
+        return {};
+    }
+    data values(str.size() - 1 - pos);
+    for (size_t i = 0; i < str.size() - 1 - pos; ++i) {
+        unsigned char c = str[i + pos + 1];
+        int8_t rev = (c < 33 || c > 126) ? -1 : CHARSET_REV[c];
+        if (rev == -1) {
+            return {};
+        }
+        values[i] = rev;
+    }
+    std::string hrp;
+    for (size_t i = 0; i < pos; ++i) {
+        hrp += LowerCase(str[i]);
+    }
+    if (!VerifyChecksum(hrp, values)) {
+        return {};
+    }
+    return {hrp, data(values.begin(), values.end() - 6)};
+}
+
+} // namespace bech32
diff --git a/src/bech32.h b/src/bech32.h
new file mode 100644
index 000000000..7ef7b2221
--- /dev/null
+++ b/src/bech32.h
@@ -0,0 +1,25 @@
+// Copyright (c) 2017 Pieter Wuille
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+// Bech32 is a string encoding format used in newer address types.
+// The output consists of a human-readable part (alphanumeric), a
+// separator character (1), and a base32 data section, the last
+// 6 characters of which are a checksum.
+//
+// For more information, see BIP 173.
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+namespace bech32
+{
+
+/** Encode a Bech32 string. Returns the empty string in case of failure. */
+std::string Encode(const std::string& hrp, const std::vector<uint8_t>& values);
+
+/** Decode a Bech32 string. Returns (hrp, data). Empty hrp means failure. */
+std::pair<std::string, std::vector<uint8_t>> Decode(const std::string& str);
+
+} // namespace bech32
diff --git a/src/bench/bench.cpp b/src/bench/bench.cpp
index f42457291..7b307d6f4 100644
--- a/src/bench/bench.cpp
+++ b/src/bench/bench.cpp
@@ -17,7 +17,7 @@ benchmark::BenchRunner::BenchmarkMap &benchmark::BenchRunner::benchmarks() {
 
 static double gettimedouble(void) {
     struct timeval tv;
-    gettimeofday(&tv, NULL);
+    gettimeofday(&tv, nullptr);
     return tv.tv_usec * 0.000001 + tv.tv_sec;
 }
 
@@ -55,13 +55,13 @@ bool benchmark::State::KeepRunning()
     else {
         now = gettimedouble();
         double elapsed = now - lastTime;
-        double elapsedOne = elapsed * countMaskInv;
+        double elapsedOne = elapsed / (countMask + 1);
         if (elapsedOne < minTime) minTime = elapsedOne;
         if (elapsedOne > maxTime) maxTime = elapsedOne;
 
         // We only use relative values, so don't have to handle 64-bit wrap-around specially
         nowCycles = perf_cpucycles();
-        uint64_t elapsedOneCycles = (nowCycles - lastCycles) * countMaskInv;
+        uint64_t elapsedOneCycles = (nowCycles - lastCycles) / (countMask + 1);
         if (elapsedOneCycles < minCycles) minCycles = elapsedOneCycles;
         if (elapsedOneCycles > maxCycles) maxCycles = elapsedOneCycles;
 
@@ -69,7 +69,6 @@ bool benchmark::State::KeepRunning()
           // If the execution was much too fast (1/128th of maxElapsed), increase the count mask by 8x and restart timing.
           // The restart avoids including the overhead of this code in the measurement.
           countMask = ((countMask<<3)|7) & ((1LL<<60)-1);
-          countMaskInv = 1./(countMask+1);
           count = 0;
           minTime = std::numeric_limits<double>::max();
           maxTime = std::numeric_limits<double>::min();
@@ -81,7 +80,6 @@ bool benchmark::State::KeepRunning()
           uint64_t newCountMask = ((countMask<<1)|1) & ((1LL<<60)-1);
           if ((count & newCountMask)==0) {
               countMask = newCountMask;
-              countMaskInv = 1./(countMask+1);
           }
         }
     }
diff --git a/src/bench/bench.h b/src/bench/bench.h
index 1f36f2a4b..79109eaa5 100644
--- a/src/bench/bench.h
+++ b/src/bench/bench.h
@@ -41,7 +41,7 @@ namespace benchmark {
         std::string name;
         double maxElapsed;
         double beginTime;
-        double lastTime, minTime, maxTime, countMaskInv;
+        double lastTime, minTime, maxTime;
         uint64_t count;
         uint64_t countMask;
         uint64_t beginCycles;
@@ -55,7 +55,6 @@ namespace benchmark {
             minCycles = std::numeric_limits<uint64_t>::max();
             maxCycles = std::numeric_limits<uint64_t>::min();
             countMask = 1;
-            countMaskInv = 1./(countMask + 1);
         }
         bool KeepRunning();
     };
diff --git a/src/bench/checkqueue.cpp b/src/bench/checkqueue.cpp
index 88a2a570f..b7ae5c2d5 100644
--- a/src/bench/checkqueue.cpp
+++ b/src/bench/checkqueue.cpp
@@ -67,7 +67,7 @@ static void CCheckQueueSpeedPrevectorJob(benchmark::State& state)
         prevector<PREVECTOR_SIZE, uint8_t> p;
         PrevectorJob(){
         }
-        PrevectorJob(FastRandomContext& insecure_rand){
+        explicit PrevectorJob(FastRandomContext& insecure_rand){
             p.resize(insecure_rand.randrange(PREVECTOR_SIZE*2));
         }
         bool operator()()
diff --git a/src/bench/crypto_hash.cpp b/src/bench/crypto_hash.cpp
index 2914a36c7..410a08e51 100644
--- a/src/bench/crypto_hash.cpp
+++ b/src/bench/crypto_hash.cpp
@@ -47,7 +47,7 @@ static void SHA256_32b(benchmark::State& state)
     std::vector<uint8_t> in(32,0);
     while (state.KeepRunning()) {
         for (int i = 0; i < 1000000; i++) {
-            CSHA256().Write(in.data(), in.size()).Finalize(&in[0]);
+            CSHA256().Write(in.data(), in.size()).Finalize(in.data());
         }
     }
 }
diff --git a/src/bench/lockedpool.cpp b/src/bench/lockedpool.cpp
index 43a142279..c6a05567b 100644
--- a/src/bench/lockedpool.cpp
+++ b/src/bench/lockedpool.cpp
@@ -21,14 +21,14 @@ static void BenchLockedPool(benchmark::State& state)
 
     std::vector<void*> addr;
     for (int x=0; x<ASIZE; ++x)
-        addr.push_back(0);
+        addr.push_back(nullptr);
     uint32_t s = 0x12345678;
     while (state.KeepRunning()) {
         for (int x=0; x<BITER; ++x) {
             int idx = s & (addr.size()-1);
             if (s & 0x80000000) {
                 b.free(addr[idx]);
-                addr[idx] = 0;
+                addr[idx] = nullptr;
             } else if(!addr[idx]) {
                 addr[idx] = b.alloc((s >> 16) & (MSIZE-1));
             }
diff --git a/src/bitcoin-cli.cpp b/src/bitcoin-cli.cpp
index c1a7c927e..e21a26922 100644
--- a/src/bitcoin-cli.cpp
+++ b/src/bitcoin-cli.cpp
@@ -37,6 +37,7 @@ std::string HelpMessageCli()
     strUsage += HelpMessageOpt("-?", _("This help message"));
     strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), BITCOIN_CONF_FILENAME));
     strUsage += HelpMessageOpt("-datadir=<dir>", _("Specify data directory"));
+    strUsage += HelpMessageOpt("-getinfo", _("Get general information from the remote server. Note that unlike server-side RPC calls, the results of -getinfo is the result of multiple non-atomic requests. Some entries in the result may represent results from different states (e.g. wallet balance may be as of a different block from the chain state reported)"));
     AppendParamsHelpMessages(strUsage);
     strUsage += HelpMessageOpt("-named", strprintf(_("Pass named instead of positional arguments (default: %s)"), DEFAULT_NAMED));
     strUsage += HelpMessageOpt("-rpcconnect=<ip>", strprintf(_("Send commands to node running on <ip> (default: %s)"), DEFAULT_RPCCONNECT));
@@ -45,7 +46,8 @@ std::string HelpMessageCli()
     strUsage += HelpMessageOpt("-rpcuser=<user>", _("Username for JSON-RPC connections"));
     strUsage += HelpMessageOpt("-rpcpassword=<pw>", _("Password for JSON-RPC connections"));
     strUsage += HelpMessageOpt("-rpcclienttimeout=<n>", strprintf(_("Timeout in seconds during HTTP requests, or 0 for no timeout. (default: %d)"), DEFAULT_HTTP_CLIENT_TIMEOUT));
-    strUsage += HelpMessageOpt("-stdin", _("Read extra arguments from standard input, one per line until EOF/Ctrl-D (recommended for sensitive information such as passphrases)"));
+    strUsage += HelpMessageOpt("-stdinrpcpass", strprintf(_("Read RPC password from standard input as a single line.  When combined with -stdin, the first line from standard input is used for the RPC password.")));
+    strUsage += HelpMessageOpt("-stdin", _("Read extra arguments from standard input, one per line until EOF/Ctrl-D (recommended for sensitive information such as passphrases).  When combined with -stdinrpcpass, the first line from standard input is used for the RPC password."));
     strUsage += HelpMessageOpt("-rpcwallet=<walletname>", _("Send RPC for non-default wallet on RPC server (argument is wallet filename in bitcoind directory, required if bitcoind/-Qt runs with multiple wallets)"));
 
     return strUsage;
@@ -79,10 +81,10 @@ static int AppInitRPC(int argc, char* argv[])
     //
     // Parameters
     //
-    ParseParameters(argc, argv);
-    if (argc<2 || IsArgSet("-?") || IsArgSet("-h") || IsArgSet("-help") || IsArgSet("-version")) {
+    gArgs.ParseParameters(argc, argv);
+    if (argc<2 || gArgs.IsArgSet("-?") || gArgs.IsArgSet("-h") || gArgs.IsArgSet("-help") || gArgs.IsArgSet("-version")) {
         std::string strUsage = strprintf(_("%s RPC client version"), _(PACKAGE_NAME)) + " " + FormatFullVersion() + "\n";
-        if (!IsArgSet("-version")) {
+        if (!gArgs.IsArgSet("-version")) {
             strUsage += "\n" + _("Usage:") + "\n" +
                   "  bitcoin-cli [options] <command> [params]  " + strprintf(_("Send command to %s"), _(PACKAGE_NAME)) + "\n" +
                   "  bitcoin-cli [options] -named <command> [name=value] ... " + strprintf(_("Send command to %s (with named arguments)"), _(PACKAGE_NAME)) + "\n" +
@@ -100,11 +102,11 @@ static int AppInitRPC(int argc, char* argv[])
         return EXIT_SUCCESS;
     }
     if (!fs::is_directory(GetDataDir(false))) {
-        fprintf(stderr, "Error: Specified data directory \"%s\" does not exist.\n", GetArg("-datadir", "").c_str());
+        fprintf(stderr, "Error: Specified data directory \"%s\" does not exist.\n", gArgs.GetArg("-datadir", "").c_str());
         return EXIT_FAILURE;
     }
     try {
-        ReadConfigFile(GetArg("-conf", BITCOIN_CONF_FILENAME));
+        gArgs.ReadConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME));
     } catch (const std::exception& e) {
         fprintf(stderr,"Error reading configuration file: %s\n", e.what());
         return EXIT_FAILURE;
@@ -116,7 +118,7 @@ static int AppInitRPC(int argc, char* argv[])
         fprintf(stderr, "Error: %s\n", e.what());
         return EXIT_FAILURE;
     }
-    if (GetBoolArg("-rpcssl", false))
+    if (gArgs.GetBoolArg("-rpcssl", false))
     {
         fprintf(stderr, "Error: SSL mode for RPC (-rpcssl) is no longer supported.\n");
         return EXIT_FAILURE;
@@ -161,8 +163,8 @@ static void http_request_done(struct evhttp_request *req, void *ctx)
 {
     HTTPReply *reply = static_cast<HTTPReply*>(ctx);
 
-    if (req == NULL) {
-        /* If req is NULL, it means an error occurred while connecting: the
+    if (req == nullptr) {
+        /* If req is nullptr, it means an error occurred while connecting: the
          * error code will have been passed to http_error_cb.
          */
         reply->status = 0;
@@ -190,7 +192,96 @@ static void http_error_cb(enum evhttp_request_error err, void *ctx)
 }
 #endif
 
-UniValue CallRPC(const std::string& strMethod, const UniValue& params)
+/** Class that handles the conversion from a command-line to a JSON-RPC request,
+ * as well as converting back to a JSON object that can be shown as result.
+ */
+class BaseRequestHandler
+{
+public:
+    virtual UniValue PrepareRequest(const std::string& method, const std::vector<std::string>& args) = 0;
+    virtual UniValue ProcessReply(const UniValue &batch_in) = 0;
+};
+
+/** Process getinfo requests */
+class GetinfoRequestHandler: public BaseRequestHandler
+{
+public:
+    const int ID_NETWORKINFO = 0;
+    const int ID_BLOCKCHAININFO = 1;
+    const int ID_WALLETINFO = 2;
+
+    /** Create a simulated `getinfo` request. */
+    UniValue PrepareRequest(const std::string& method, const std::vector<std::string>& args) override
+    {
+        UniValue result(UniValue::VARR);
+        result.push_back(JSONRPCRequestObj("getnetworkinfo", NullUniValue, ID_NETWORKINFO));
+        result.push_back(JSONRPCRequestObj("getblockchaininfo", NullUniValue, ID_BLOCKCHAININFO));
+        result.push_back(JSONRPCRequestObj("getwalletinfo", NullUniValue, ID_WALLETINFO));
+        return result;
+    }
+
+    /** Collect values from the batch and form a simulated `getinfo` reply. */
+    UniValue ProcessReply(const UniValue &batch_in) override
+    {
+        UniValue result(UniValue::VOBJ);
+        std::vector<UniValue> batch = JSONRPCProcessBatchReply(batch_in, 3);
+        // Errors in getnetworkinfo() and getblockchaininfo() are fatal, pass them on
+        // getwalletinfo() is allowed to fail in case there is no wallet.
+        if (!batch[ID_NETWORKINFO]["error"].isNull()) {
+            return batch[ID_NETWORKINFO];
+        }
+        if (!batch[ID_BLOCKCHAININFO]["error"].isNull()) {
+            return batch[ID_BLOCKCHAININFO];
+        }
+        result.pushKV("version", batch[ID_NETWORKINFO]["result"]["version"]);
+        result.pushKV("protocolversion", batch[ID_NETWORKINFO]["result"]["protocolversion"]);
+        if (!batch[ID_WALLETINFO].isNull()) {
+            result.pushKV("walletversion", batch[ID_WALLETINFO]["result"]["walletversion"]);
+            result.pushKV("balance", batch[ID_WALLETINFO]["result"]["balance"]);
+        }
+        result.pushKV("blocks", batch[ID_BLOCKCHAININFO]["result"]["blocks"]);
+        result.pushKV("timeoffset", batch[ID_NETWORKINFO]["result"]["timeoffset"]);
+        result.pushKV("connections", batch[ID_NETWORKINFO]["result"]["connections"]);
+        result.pushKV("proxy", batch[ID_NETWORKINFO]["result"]["networks"][0]["proxy"]);
+        result.pushKV("difficulty", batch[ID_BLOCKCHAININFO]["result"]["difficulty"]);
+        result.pushKV("testnet", UniValue(batch[ID_BLOCKCHAININFO]["result"]["chain"].get_str() == "test"));
+        if (!batch[ID_WALLETINFO].isNull()) {
+            result.pushKV("walletversion", batch[ID_WALLETINFO]["result"]["walletversion"]);
+            result.pushKV("balance", batch[ID_WALLETINFO]["result"]["balance"]);
+            result.pushKV("keypoololdest", batch[ID_WALLETINFO]["result"]["keypoololdest"]);
+            result.pushKV("keypoolsize", batch[ID_WALLETINFO]["result"]["keypoolsize"]);
+            if (!batch[ID_WALLETINFO]["result"]["unlocked_until"].isNull()) {
+                result.pushKV("unlocked_until", batch[ID_WALLETINFO]["result"]["unlocked_until"]);
+            }
+            result.pushKV("paytxfee", batch[ID_WALLETINFO]["result"]["paytxfee"]);
+        }
+        result.pushKV("relayfee", batch[ID_NETWORKINFO]["result"]["relayfee"]);
+        result.pushKV("warnings", batch[ID_NETWORKINFO]["result"]["warnings"]);
+        return JSONRPCReplyObj(result, NullUniValue, 1);
+    }
+};
+
+/** Process default single requests */
+class DefaultRequestHandler: public BaseRequestHandler {
+public:
+    UniValue PrepareRequest(const std::string& method, const std::vector<std::string>& args) override
+    {
+        UniValue params;
+        if(gArgs.GetBoolArg("-named", DEFAULT_NAMED)) {
+            params = RPCConvertNamedValues(method, args);
+        } else {
+            params = RPCConvertValues(method, args);
+        }
+        return JSONRPCRequestObj(method, params, 1);
+    }
+
+    UniValue ProcessReply(const UniValue &reply) override
+    {
+        return reply.get_obj();
+    }
+};
+
+static UniValue CallRPC(BaseRequestHandler *rh, const std::string& strMethod, const std::vector<std::string>& args)
 {
     std::string host;
     // In preference order, we choose the following for the port:
@@ -198,19 +289,19 @@ UniValue CallRPC(const std::string& strMethod, const UniValue& params)
     //     2. port in -rpcconnect (ie following : in ipv4 or ]: in ipv6)
     //     3. default port for chain
     int port = BaseParams().RPCPort();
-    SplitHostPort(GetArg("-rpcconnect", DEFAULT_RPCCONNECT), port, host);
-    port = GetArg("-rpcport", port);
+    SplitHostPort(gArgs.GetArg("-rpcconnect", DEFAULT_RPCCONNECT), port, host);
+    port = gArgs.GetArg("-rpcport", port);
 
     // Obtain event base
     raii_event_base base = obtain_event_base();
 
     // Synchronously look up hostname
     raii_evhttp_connection evcon = obtain_evhttp_connection_base(base.get(), host, port);
-    evhttp_connection_set_timeout(evcon.get(), GetArg("-rpcclienttimeout", DEFAULT_HTTP_CLIENT_TIMEOUT));
+    evhttp_connection_set_timeout(evcon.get(), gArgs.GetArg("-rpcclienttimeout", DEFAULT_HTTP_CLIENT_TIMEOUT));
 
     HTTPReply response;
     raii_evhttp_request req = obtain_evhttp_request(http_request_done, (void*)&response);
-    if (req == NULL)
+    if (req == nullptr)
         throw std::runtime_error("create http request failed");
 #if LIBEVENT_VERSION_NUMBER >= 0x02010300
     evhttp_request_set_error_cb(req.get(), http_error_cb);
@@ -218,16 +309,16 @@ UniValue CallRPC(const std::string& strMethod, const UniValue& params)
 
     // Get credentials
     std::string strRPCUserColonPass;
-    if (GetArg("-rpcpassword", "") == "") {
+    if (gArgs.GetArg("-rpcpassword", "") == "") {
         // Try fall back to cookie-based authentication if no password is provided
         if (!GetAuthCookie(&strRPCUserColonPass)) {
             throw std::runtime_error(strprintf(
-                _("Could not locate RPC credentials. No authentication cookie could be found, and no rpcpassword is set in the configuration file (%s)"),
-                    GetConfigFile(GetArg("-conf", BITCOIN_CONF_FILENAME)).string().c_str()));
+                _("Could not locate RPC credentials. No authentication cookie could be found, and RPC password is not set.  See -rpcpassword and -stdinrpcpass.  Configuration file: (%s)"),
+                    GetConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME)).string().c_str()));
 
         }
     } else {
-        strRPCUserColonPass = GetArg("-rpcuser", "") + ":" + GetArg("-rpcpassword", "");
+        strRPCUserColonPass = gArgs.GetArg("-rpcuser", "") + ":" + gArgs.GetArg("-rpcpassword", "");
     }
 
     struct evkeyvalq* output_headers = evhttp_request_get_output_headers(req.get());
@@ -237,14 +328,14 @@ UniValue CallRPC(const std::string& strMethod, const UniValue& params)
     evhttp_add_header(output_headers, "Authorization", (std::string("Basic ") + EncodeBase64(strRPCUserColonPass)).c_str());
 
     // Attach request data
-    std::string strRequest = JSONRPCRequestObj(strMethod, params, 1).write() + "\n";
+    std::string strRequest = rh->PrepareRequest(strMethod, args).write() + "\n";
     struct evbuffer* output_buffer = evhttp_request_get_output_buffer(req.get());
     assert(output_buffer);
     evbuffer_add(output_buffer, strRequest.data(), strRequest.size());
 
     // check if we should use a special wallet endpoint
     std::string endpoint = "/";
-    std::string walletName = GetArg("-rpcwallet", "");
+    std::string walletName = gArgs.GetArg("-rpcwallet", "");
     if (!walletName.empty()) {
         char *encodedURI = evhttp_uriencode(walletName.c_str(), walletName.size(), false);
         if (encodedURI) {
@@ -276,7 +367,7 @@ UniValue CallRPC(const std::string& strMethod, const UniValue& params)
     UniValue valReply(UniValue::VSTR);
     if (!valReply.read(response.body))
         throw std::runtime_error("couldn't parse reply from server");
-    const UniValue& reply = valReply.get_obj();
+    const UniValue reply = rh->ProcessReply(valReply);
     if (reply.empty())
         throw std::runtime_error("expected reply to have result, error and id properties");
 
@@ -293,30 +384,40 @@ int CommandLineRPC(int argc, char *argv[])
             argc--;
             argv++;
         }
+        std::string rpcPass;
+        if (gArgs.GetBoolArg("-stdinrpcpass", false)) {
+            if (!std::getline(std::cin, rpcPass)) {
+                throw std::runtime_error("-stdinrpcpass specified but failed to read from standard input");
+            }
+            gArgs.ForceSetArg("-rpcpassword", rpcPass);
+        }
         std::vector<std::string> args = std::vector<std::string>(&argv[1], &argv[argc]);
-        if (GetBoolArg("-stdin", false)) {
+        if (gArgs.GetBoolArg("-stdin", false)) {
             // Read one arg per line from stdin and append
             std::string line;
-            while (std::getline(std::cin,line))
+            while (std::getline(std::cin, line)) {
                 args.push_back(line);
+            }
         }
-        if (args.size() < 1)
-            throw std::runtime_error("too few parameters (need at least command)");
-        std::string strMethod = args[0];
-        args.erase(args.begin()); // Remove trailing method name from arguments vector
-
-        UniValue params;
-        if(GetBoolArg("-named", DEFAULT_NAMED)) {
-            params = RPCConvertNamedValues(strMethod, args);
+        std::unique_ptr<BaseRequestHandler> rh;
+        std::string method;
+        if (gArgs.GetBoolArg("-getinfo", false)) {
+            rh.reset(new GetinfoRequestHandler());
+            method = "";
         } else {
-            params = RPCConvertValues(strMethod, args);
+            rh.reset(new DefaultRequestHandler());
+            if (args.size() < 1) {
+                throw std::runtime_error("too few parameters (need at least command)");
+            }
+            method = args[0];
+            args.erase(args.begin()); // Remove trailing method name from arguments vector
         }
 
         // Execute and handle connection failures with -rpcwait
-        const bool fWait = GetBoolArg("-rpcwait", false);
+        const bool fWait = gArgs.GetBoolArg("-rpcwait", false);
         do {
             try {
-                const UniValue reply = CallRPC(strMethod, params);
+                const UniValue reply = CallRPC(rh.get(), method, args);
 
                 // Parse reply
                 const UniValue& result = find_value(reply, "result");
@@ -370,7 +471,7 @@ int CommandLineRPC(int argc, char *argv[])
         nRet = EXIT_FAILURE;
     }
     catch (...) {
-        PrintExceptionContinue(NULL, "CommandLineRPC()");
+        PrintExceptionContinue(nullptr, "CommandLineRPC()");
         throw;
     }
 
@@ -397,7 +498,7 @@ int main(int argc, char* argv[])
         PrintExceptionContinue(&e, "AppInitRPC()");
         return EXIT_FAILURE;
     } catch (...) {
-        PrintExceptionContinue(NULL, "AppInitRPC()");
+        PrintExceptionContinue(nullptr, "AppInitRPC()");
         return EXIT_FAILURE;
     }
 
@@ -408,7 +509,7 @@ int main(int argc, char* argv[])
     catch (const std::exception& e) {
         PrintExceptionContinue(&e, "CommandLineRPC()");
     } catch (...) {
-        PrintExceptionContinue(NULL, "CommandLineRPC()");
+        PrintExceptionContinue(nullptr, "CommandLineRPC()");
     }
     return ret;
 }
diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
index 9acb3fd30..a20222d05 100644
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -39,7 +39,7 @@ static int AppInitRawTx(int argc, char* argv[])
     //
     // Parameters
     //
-    ParseParameters(argc, argv);
+    gArgs.ParseParameters(argc, argv);
 
     // Check for -testnet or -regtest parameter (Params() calls are only valid after this clause)
     try {
@@ -49,9 +49,9 @@ static int AppInitRawTx(int argc, char* argv[])
         return EXIT_FAILURE;
     }
 
-    fCreateBlank = GetBoolArg("-create", false);
+    fCreateBlank = gArgs.GetBoolArg("-create", false);
 
-    if (argc<2 || IsArgSet("-?") || IsArgSet("-h") || IsArgSet("-help"))
+    if (argc<2 || gArgs.IsArgSet("-?") || gArgs.IsArgSet("-h") || gArgs.IsArgSet("-help"))
     {
         // First part of help message is specific to this utility
         std::string strUsage = strprintf(_("%s bitcoin-tx utility version"), _(PACKAGE_NAME)) + " " + FormatFullVersion() + "\n\n" +
@@ -271,11 +271,11 @@ static void MutateTxAddOutAddr(CMutableTransaction& tx, const std::string& strIn
 
     // extract and validate ADDRESS
     std::string strAddr = vStrInputParts[1];
-    CBitcoinAddress addr(strAddr);
-    if (!addr.IsValid())
+    CTxDestination destination = DecodeDestination(strAddr);
+    if (!IsValidDestination(destination)) {
         throw std::runtime_error("invalid TX output address");
-    // build standard output script via GetScriptForDestination()
-    CScript scriptPubKey = GetScriptForDestination(addr.Get());
+    }
+    CScript scriptPubKey = GetScriptForDestination(destination);
 
     // construct TxOut, append to transaction output list
     CTxOut txout(value, scriptPubKey);
@@ -310,14 +310,15 @@ static void MutateTxAddOutPubKey(CMutableTransaction& tx, const std::string& str
     }
 
     if (bSegWit) {
+        if (!pubkey.IsCompressed()) {
+            throw std::runtime_error("Uncompressed pubkeys are not useable for SegWit outputs");
+        }
         // Call GetScriptForWitness() to build a P2WSH scriptPubKey
         scriptPubKey = GetScriptForWitness(scriptPubKey);
     }
     if (bScriptHash) {
-        // Get the address for the redeem script, then call
-        // GetScriptForDestination() to construct a P2SH scriptPubKey.
-        CBitcoinAddress redeemScriptAddr(scriptPubKey);
-        scriptPubKey = GetScriptForDestination(redeemScriptAddr.Get());
+        // Get the ID for the script, and then construct a P2SH destination for it.
+        scriptPubKey = GetScriptForDestination(CScriptID(scriptPubKey));
     }
 
     // construct TxOut, append to transaction output list
@@ -377,14 +378,17 @@ static void MutateTxAddOutMultiSig(CMutableTransaction& tx, const std::string& s
     CScript scriptPubKey = GetScriptForMultisig(required, pubkeys);
 
     if (bSegWit) {
+        for (CPubKey& pubkey : pubkeys) {
+            if (!pubkey.IsCompressed()) {
+                throw std::runtime_error("Uncompressed pubkeys are not useable for SegWit outputs");
+            }
+        }
         // Call GetScriptForWitness() to build a P2WSH scriptPubKey
         scriptPubKey = GetScriptForWitness(scriptPubKey);
     }
     if (bScriptHash) {
-        // Get the address for the redeem script, then call
-        // GetScriptForDestination() to construct a P2SH scriptPubKey.
-        CBitcoinAddress addr(scriptPubKey);
-        scriptPubKey = GetScriptForDestination(addr.Get());
+        // Get the ID for the script, and then construct a P2SH destination for it.
+        scriptPubKey = GetScriptForDestination(CScriptID(scriptPubKey));
     }
 
     // construct TxOut, append to transaction output list
@@ -444,11 +448,10 @@ static void MutateTxAddOutScript(CMutableTransaction& tx, const std::string& str
     }
 
     if (bSegWit) {
-      scriptPubKey = GetScriptForWitness(scriptPubKey);
+        scriptPubKey = GetScriptForWitness(scriptPubKey);
     }
     if (bScriptHash) {
-      CBitcoinAddress addr(scriptPubKey);
-      scriptPubKey = GetScriptForDestination(addr.Get());
+        scriptPubKey = GetScriptForDestination(CScriptID(scriptPubKey));
     }
 
     // construct TxOut, append to transaction output list
@@ -687,10 +690,10 @@ static void MutateTx(CMutableTransaction& tx, const std::string& command,
     else if (command == "outaddr")
         MutateTxAddOutAddr(tx, commandVal);
     else if (command == "outpubkey") {
-        if (!ecc) { ecc.reset(new Secp256k1Init()); }
+        ecc.reset(new Secp256k1Init());
         MutateTxAddOutPubKey(tx, commandVal);
     } else if (command == "outmultisig") {
-        if (!ecc) { ecc.reset(new Secp256k1Init()); }
+        ecc.reset(new Secp256k1Init());
         MutateTxAddOutMultiSig(tx, commandVal);
     } else if (command == "outscript")
         MutateTxAddOutScript(tx, commandVal);
@@ -698,7 +701,7 @@ static void MutateTx(CMutableTransaction& tx, const std::string& command,
         MutateTxAddOutData(tx, commandVal);
 
     else if (command == "sign") {
-        if (!ecc) { ecc.reset(new Secp256k1Init()); }
+        ecc.reset(new Secp256k1Init());
         MutateTxSign(tx, commandVal);
     }
 
@@ -737,9 +740,9 @@ static void OutputTxHex(const CTransaction& tx)
 
 static void OutputTx(const CTransaction& tx)
 {
-    if (GetBoolArg("-json", false))
+    if (gArgs.GetBoolArg("-json", false))
         OutputTxJSON(tx);
-    else if (GetBoolArg("-txid", false))
+    else if (gArgs.GetBoolArg("-txid", false))
         OutputTxHash(tx);
     else
         OutputTxHex(tx);
@@ -822,7 +825,7 @@ static int CommandLineRawTx(int argc, char* argv[])
         nRet = EXIT_FAILURE;
     }
     catch (...) {
-        PrintExceptionContinue(NULL, "CommandLineRawTx()");
+        PrintExceptionContinue(nullptr, "CommandLineRawTx()");
         throw;
     }
 
@@ -845,7 +848,7 @@ int main(int argc, char* argv[])
         PrintExceptionContinue(&e, "AppInitRawTx()");
         return EXIT_FAILURE;
     } catch (...) {
-        PrintExceptionContinue(NULL, "AppInitRawTx()");
+        PrintExceptionContinue(nullptr, "AppInitRawTx()");
         return EXIT_FAILURE;
     }
 
@@ -856,7 +859,7 @@ int main(int argc, char* argv[])
     catch (const std::exception& e) {
         PrintExceptionContinue(&e, "CommandLineRawTx()");
     } catch (...) {
-        PrintExceptionContinue(NULL, "CommandLineRawTx()");
+        PrintExceptionContinue(nullptr, "CommandLineRawTx()");
     }
     return ret;
 }
diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index e26ef95d0..543eba0e6 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -70,15 +70,15 @@ bool AppInit(int argc, char* argv[])
     //
     // Parameters
     //
-    // If Qt is used, parameters/chips.conf are parsed in qt/bitcoin.cpp's main()
-    ParseParameters(argc, argv);
+    // If Qt is used, parameters/bitcoin.conf are parsed in qt/bitcoin.cpp's main()
+    gArgs.ParseParameters(argc, argv);
 
     // Process help and version before taking care about datadir
-    if (IsArgSet("-?") || IsArgSet("-h") ||  IsArgSet("-help") || IsArgSet("-version"))
+    if (gArgs.IsArgSet("-?") || gArgs.IsArgSet("-h") ||  gArgs.IsArgSet("-help") || gArgs.IsArgSet("-version"))
     {
         std::string strUsage = strprintf(_("%s Daemon"), _(PACKAGE_NAME)) + " " + _("version") + " " + FormatFullVersion() + "\n";
 
-        if (IsArgSet("-version"))
+        if (gArgs.IsArgSet("-version"))
         {
             strUsage += FormatParagraph(LicenseInfo());
         }
@@ -98,12 +98,12 @@ bool AppInit(int argc, char* argv[])
     {
         if (!fs::is_directory(GetDataDir(false)))
         {
-            fprintf(stderr, "Error: Specified data directory \"%s\" does not exist.\n", GetArg("-datadir", "").c_str());
+            fprintf(stderr, "Error: Specified data directory \"%s\" does not exist.\n", gArgs.GetArg("-datadir", "").c_str());
             return false;
         }
         try
         {
-            ReadConfigFile(GetArg("-conf", BITCOIN_CONF_FILENAME));
+            gArgs.ReadConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME));
         } catch (const std::exception& e) {
             fprintf(stderr,"Error reading configuration file: %s\n", e.what());
             return false;
@@ -125,7 +125,7 @@ bool AppInit(int argc, char* argv[])
         }
 
         // -server defaults to true for bitcoind but not for the GUI so do this here
-        SoftSetBoolArg("-server", true);
+        gArgs.SoftSetBoolArg("-server", true);
         // Set this early so that parameter interactions go to console
         InitLogging();
         InitParameterInteraction();
@@ -144,7 +144,7 @@ bool AppInit(int argc, char* argv[])
             // InitError will have been called with detailed error, which ends up on console
             exit(EXIT_FAILURE);
         }
-        if (GetBoolArg("-daemon", false))
+        if (gArgs.GetBoolArg("-daemon", false))
         {
 #if HAVE_DECL_DAEMON
             fprintf(stdout, "Bitcoin server starting\n");
@@ -170,7 +170,7 @@ bool AppInit(int argc, char* argv[])
     catch (const std::exception& e) {
         PrintExceptionContinue(&e, "AppInit()");
     } catch (...) {
-        PrintExceptionContinue(NULL, "AppInit()");
+        PrintExceptionContinue(nullptr, "AppInit()");
     }
 
     if (!fRet)
diff --git a/src/blockencodings.h b/src/blockencodings.h
index 5a1d80d42..50478f9f3 100644
--- a/src/blockencodings.h
+++ b/src/blockencodings.h
@@ -16,7 +16,7 @@ struct TransactionCompressor {
 private:
     CTransactionRef& tx;
 public:
-    TransactionCompressor(CTransactionRef& txIn) : tx(txIn) {}
+    explicit TransactionCompressor(CTransactionRef& txIn) : tx(txIn) {}
 
     ADD_SERIALIZE_METHODS;
 
@@ -75,7 +75,7 @@ class BlockTransactions {
     std::vector<CTransactionRef> txn;
 
     BlockTransactions() {}
-    BlockTransactions(const BlockTransactionsRequest& req) :
+    explicit BlockTransactions(const BlockTransactionsRequest& req) :
         blockhash(req.blockhash), txn(req.indexes.size()) {}
 
     ADD_SERIALIZE_METHODS;
@@ -198,7 +198,7 @@ class PartiallyDownloadedBlock {
     CTxMemPool* pool;
 public:
     CBlockHeader header;
-    PartiallyDownloadedBlock(CTxMemPool* poolIn) : pool(poolIn) {}
+    explicit PartiallyDownloadedBlock(CTxMemPool* poolIn) : pool(poolIn) {}
 
     // extra_txn is a list of extra transactions to look at, in <witness hash, reference> form
     ReadStatus InitData(const CBlockHeaderAndShortTxIDs& cmpctblock, const std::vector<std::pair<uint256, CTransactionRef>>& extra_txn);
diff --git a/src/chain.cpp b/src/chain.cpp
index ffd58d471..5e3dd9b31 100644
--- a/src/chain.cpp
+++ b/src/chain.cpp
@@ -9,7 +9,7 @@
  * CChain implementation
  */
 void CChain::SetTip(CBlockIndex *pindex) {
-    if (pindex == NULL) {
+    if (pindex == nullptr) {
         vChain.clear();
         return;
     }
@@ -49,8 +49,8 @@ CBlockLocator CChain::GetLocator(const CBlockIndex *pindex) const {
 }
 
 const CBlockIndex *CChain::FindFork(const CBlockIndex *pindex) const {
-    if (pindex == NULL) {
-        return NULL;
+    if (pindex == nullptr) {
+        return nullptr;
     }
     if (pindex->nHeight > Height())
         pindex = pindex->GetAncestor(Height());
@@ -63,7 +63,7 @@ CBlockIndex* CChain::FindEarliestAtLeast(int64_t nTime) const
 {
     std::vector<CBlockIndex*>::const_iterator lower = std::lower_bound(vChain.begin(), vChain.end(), nTime,
         [](CBlockIndex* pBlock, const int64_t& time) -> bool { return pBlock->GetBlockTimeMax() < time; });
-    return (lower == vChain.end() ? NULL : *lower);
+    return (lower == vChain.end() ? nullptr : *lower);
 }
 
 /** Turn the lowest '1' bit in the binary representation of a number into a '0'. */
@@ -83,14 +83,14 @@ int static inline GetSkipHeight(int height) {
 CBlockIndex* CBlockIndex::GetAncestor(int height)
 {
     if (height > nHeight || height < 0)
-        return NULL;
+        return nullptr;
 
     CBlockIndex* pindexWalk = this;
     int heightWalk = nHeight;
     while (heightWalk > height) {
         int heightSkip = GetSkipHeight(heightWalk);
         int heightSkipPrev = GetSkipHeight(heightWalk - 1);
-        if (pindexWalk->pskip != NULL &&
+        if (pindexWalk->pskip != nullptr &&
             (heightSkip == height ||
              (heightSkip > height && !(heightSkipPrev < heightSkip - 2 &&
                                        heightSkipPrev >= height)))) {
@@ -128,7 +128,7 @@ arith_uint256 GetBlockProof(const CBlockIndex& block)
     // We need to compute 2**256 / (bnTarget+1), but we can't represent 2**256
     // as it's too large for an arith_uint256. However, as 2**256 is at least as large
     // as bnTarget+1, it is equal to ((2**256 - bnTarget - 1) / (bnTarget+1)) + 1,
-    // or ~bnTarget / (nTarget+1) + 1.
+    // or ~bnTarget / (bnTarget+1) + 1.
     return (~bnTarget / (bnTarget + 1)) + 1;
 }
 
@@ -150,7 +150,7 @@ int64_t GetBlockProofEquivalentTime(const CBlockIndex& to, const CBlockIndex& fr
 }
 
 /** Find the last common ancestor two blocks have.
- *  Both pa and pb must be non-NULL. */
+ *  Both pa and pb must be non-nullptr. */
 const CBlockIndex* LastCommonAncestor(const CBlockIndex* pa, const CBlockIndex* pb) {
     if (pa->nHeight > pb->nHeight) {
         pa = pa->GetAncestor(pb->nHeight);
diff --git a/src/chain.h b/src/chain.h
index c5304b7d6..f1036e5d9 100644
--- a/src/chain.h
+++ b/src/chain.h
@@ -204,26 +204,26 @@ class CBlockIndex
     unsigned int nChainTx;
 
     //! Verification status of this block. See enum BlockStatus
-    unsigned int nStatus;
+    uint32_t nStatus;
 
     //! block header
-    int nVersion;
+    int32_t nVersion;
     uint256 hashMerkleRoot;
-    unsigned int nTime;
-    unsigned int nBits;
-    unsigned int nNonce;
+    uint32_t nTime;
+    uint32_t nBits;
+    uint32_t nNonce;
 
     //! (memory only) Sequential id assigned to distinguish order in which blocks are received.
     int32_t nSequenceId;
 
-    //! (memory only) Maximum nTime in the chain upto and including this block.
+    //! (memory only) Maximum nTime in the chain up to and including this block.
     unsigned int nTimeMax;
 
     void SetNull()
     {
-        phashBlock = NULL;
-        pprev = NULL;
-        pskip = NULL;
+        phashBlock = nullptr;
+        pprev = nullptr;
+        pskip = nullptr;
         nHeight = 0;
         nFile = 0;
         nDataPos = 0;
@@ -247,7 +247,7 @@ class CBlockIndex
         SetNull();
     }
 
-    CBlockIndex(const CBlockHeader& block)
+    explicit CBlockIndex(const CBlockHeader& block)
     {
         SetNull();
 
@@ -437,20 +437,20 @@ class CChain {
     std::vector<CBlockIndex*> vChain;
 
 public:
-    /** Returns the index entry for the genesis block of this chain, or NULL if none. */
+    /** Returns the index entry for the genesis block of this chain, or nullptr if none. */
     CBlockIndex *Genesis() const {
-        return vChain.size() > 0 ? vChain[0] : NULL;
+        return vChain.size() > 0 ? vChain[0] : nullptr;
     }
 
-    /** Returns the index entry for the tip of this chain, or NULL if none. */
+    /** Returns the index entry for the tip of this chain, or nullptr if none. */
     CBlockIndex *Tip() const {
-        return vChain.size() > 0 ? vChain[vChain.size() - 1] : NULL;
+        return vChain.size() > 0 ? vChain[vChain.size() - 1] : nullptr;
     }
 
-    /** Returns the index entry at a particular height in this chain, or NULL if no such height exists. */
+    /** Returns the index entry at a particular height in this chain, or nullptr if no such height exists. */
     CBlockIndex *operator[](int nHeight) const {
         if (nHeight < 0 || nHeight >= (int)vChain.size())
-            return NULL;
+            return nullptr;
         return vChain[nHeight];
     }
 
@@ -465,12 +465,12 @@ class CChain {
         return (*this)[pindex->nHeight] == pindex;
     }
 
-    /** Find the successor of a block in this chain, or NULL if the given index is not found or is the tip. */
+    /** Find the successor of a block in this chain, or nullptr if the given index is not found or is the tip. */
     CBlockIndex *Next(const CBlockIndex *pindex) const {
         if (Contains(pindex))
             return (*this)[pindex->nHeight + 1];
         else
-            return NULL;
+            return nullptr;
     }
 
     /** Return the maximal height in the chain. Is equal to chain.Tip() ? chain.Tip()->nHeight : -1. */
@@ -482,7 +482,7 @@ class CChain {
     void SetTip(CBlockIndex *pindex);
 
     /** Return a CBlockLocator that refers to a block in this chain (by default the tip). */
-    CBlockLocator GetLocator(const CBlockIndex *pindex = NULL) const;
+    CBlockLocator GetLocator(const CBlockIndex *pindex = nullptr) const;
 
     /** Find the last common block between this chain and a block index entry. */
     const CBlockIndex *FindFork(const CBlockIndex *pindex) const;
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 077a2b1b3..1c76a6e9a 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -152,7 +152,7 @@ class CMainParams : public CChainParams {
         base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,188);
         base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x88, 0xB2, 0x1E};
         base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x88, 0xAD, 0xE4};
-
+        bech32_hrp = "bc";
         //vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_main, pnSeed6_main + ARRAYLEN(pnSeed6_main));
 
         fDefaultConsistencyChecks = false;
@@ -271,7 +271,6 @@ class CTestNetParams : public CChainParams {
         vSeeds.emplace_back("testnet-seed.bitcoin.jonasschnelli.ch", true);
         vSeeds.emplace_back("seed.tbtc.petertodd.org", true);
         vSeeds.emplace_back("testnet-seed.bluematt.me", false);
-        vSeeds.emplace_back("testnet-seed.bitcoin.schildbach.de", false);
 
         base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
         base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);
@@ -279,6 +278,8 @@ class CTestNetParams : public CChainParams {
         base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
         base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};
 
+        bech32_hrp = "tb";
+
         vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_test, pnSeed6_test + ARRAYLEN(pnSeed6_test));
 
         fDefaultConsistencyChecks = false;
@@ -373,6 +374,8 @@ class CRegTestParams : public CChainParams {
         base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,239);
         base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
         base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};
+
+        bech32_hrp = "bcrt";
     }
 };
 
diff --git a/src/chainparams.h b/src/chainparams.h
index f55ae4cf7..3948c9163 100644
--- a/src/chainparams.h
+++ b/src/chainparams.h
@@ -73,6 +73,7 @@ class CChainParams
     std::string NetworkIDString() const { return strNetworkID; }
     const std::vector<CDNSSeedData>& DNSSeeds() const { return vSeeds; }
     const std::vector<unsigned char>& Base58Prefix(Base58Type type) const { return base58Prefixes[type]; }
+    const std::string& Bech32HRP() const { return bech32_hrp; }
     const std::vector<SeedSpec6>& FixedSeeds() const { return vFixedSeeds; }
     const CCheckpointData& Checkpoints() const { return checkpointData; }
     const ChainTxData& TxData() const { return chainTxData; }
@@ -86,6 +87,7 @@ class CChainParams
     uint64_t nPruneAfterHeight;
     std::vector<CDNSSeedData> vSeeds;
     std::vector<unsigned char> base58Prefixes[MAX_BASE58_TYPES];
+    std::string bech32_hrp;
     std::string strNetworkID;
     CBlock genesis;
     std::vector<SeedSpec6> vFixedSeeds;
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index 5b0a25c42..05d0590d8 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -57,7 +57,7 @@ class CBaseRegTestParams : public CBaseChainParams
 public:
     CBaseRegTestParams()
     {
-        nRPCPort = 18332;
+        nRPCPort = 18443;
         strDataDir = "regtest";
     }
 };
@@ -89,8 +89,8 @@ void SelectBaseParams(const std::string& chain)
 
 std::string ChainNameFromCommandLine()
 {
-    bool fRegTest = GetBoolArg("-regtest", false);
-    bool fTestNet = GetBoolArg("-testnet", false);
+    bool fRegTest = gArgs.GetBoolArg("-regtest", false);
+    bool fTestNet = gArgs.GetBoolArg("-testnet", false);
 
     if (fTestNet && fRegTest)
         throw std::runtime_error("Invalid combination of -regtest and -testnet.");
diff --git a/src/checkpoints.cpp b/src/checkpoints.cpp
index e6b5fb72a..5afe3e66b 100644
--- a/src/checkpoints.cpp
+++ b/src/checkpoints.cpp
@@ -26,7 +26,7 @@ namespace Checkpoints {
             if (t != mapBlockIndex.end())
                 return t->second;
         }
-        return NULL;
+        return nullptr;
     }
 
 } // namespace Checkpoints
diff --git a/src/checkqueue.h b/src/checkqueue.h
index 408e278d2..6377fbe94 100644
--- a/src/checkqueue.h
+++ b/src/checkqueue.h
@@ -131,7 +131,7 @@ class CCheckQueue
     boost::mutex ControlMutex;
 
     //! Create a new check queue
-    CCheckQueue(unsigned int nBatchSizeIn) : nIdle(0), nTotal(0), fAllOk(true), nTodo(0), fQuit(false), nBatchSize(nBatchSizeIn) {}
+    explicit CCheckQueue(unsigned int nBatchSizeIn) : nIdle(0), nTotal(0), fAllOk(true), nTodo(0), fQuit(false), nBatchSize(nBatchSizeIn) {}
 
     //! Worker thread
     void Thread()
@@ -183,15 +183,15 @@ class CCheckQueueControl
     CCheckQueueControl& operator=(const CCheckQueueControl&) = delete;
     explicit CCheckQueueControl(CCheckQueue<T> * const pqueueIn) : pqueue(pqueueIn), fDone(false)
     {
-        // passed queue is supposed to be unused, or NULL
-        if (pqueue != NULL) {
+        // passed queue is supposed to be unused, or nullptr
+        if (pqueue != nullptr) {
             ENTER_CRITICAL_SECTION(pqueue->ControlMutex);
         }
     }
 
     bool Wait()
     {
-        if (pqueue == NULL)
+        if (pqueue == nullptr)
             return true;
         bool fRet = pqueue->Wait();
         fDone = true;
@@ -200,7 +200,7 @@ class CCheckQueueControl
 
     void Add(std::vector<T>& vChecks)
     {
-        if (pqueue != NULL)
+        if (pqueue != nullptr)
             pqueue->Add(vChecks);
     }
 
@@ -208,7 +208,7 @@ class CCheckQueueControl
     {
         if (!fDone)
             Wait();
-        if (pqueue != NULL) {
+        if (pqueue != nullptr) {
             LEAVE_CRITICAL_SECTION(pqueue->ControlMutex);
         }
     }
diff --git a/src/clientversion.cpp b/src/clientversion.cpp
index d2344ded0..8a4b40883 100644
--- a/src/clientversion.cpp
+++ b/src/clientversion.cpp
@@ -10,7 +10,7 @@
 
 /**
  * Name of client reported in the 'version' message. Report the same name
- * for both bitcoind and bitcoin-core, to make it harder for attackers to
+ * for both bitcoind and bitcoin-qt, to make it harder for attackers to
  * target servers or GUI users specifically.
  */
 const std::string CLIENT_NAME("Satoshi");
diff --git a/src/coins.cpp b/src/coins.cpp
index e30bda930..b45dfc334 100644
--- a/src/coins.cpp
+++ b/src/coins.cpp
@@ -14,7 +14,7 @@ bool CCoinsView::GetCoin(const COutPoint &outpoint, Coin &coin) const { return f
 uint256 CCoinsView::GetBestBlock() const { return uint256(); }
 std::vector<uint256> CCoinsView::GetHeadBlocks() const { return std::vector<uint256>(); }
 bool CCoinsView::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) { return false; }
-CCoinsViewCursor *CCoinsView::Cursor() const { return 0; }
+CCoinsViewCursor *CCoinsView::Cursor() const { return nullptr; }
 
 bool CCoinsView::HaveCoin(const COutPoint &outpoint) const
 {
diff --git a/src/coins.h b/src/coins.h
index efb5ce869..181b2fd4b 100644
--- a/src/coins.h
+++ b/src/coins.h
@@ -214,6 +214,11 @@ class CCoinsViewCache : public CCoinsViewBacked
 public:
     CCoinsViewCache(CCoinsView *baseIn);
 
+    /**
+     * By deleting the copy constructor, we prevent accidentally using it when one intends to create a cache on top of a base cache.
+     */
+    CCoinsViewCache(const CCoinsViewCache &) = delete;
+
     // Standard CCoinsView methods
     bool GetCoin(const COutPoint &outpoint, Coin &coin) const override;
     bool HaveCoin(const COutPoint &outpoint) const override;
@@ -290,11 +295,6 @@ class CCoinsViewCache : public CCoinsViewBacked
 
 private:
     CCoinsMap::iterator FetchCoin(const COutPoint &outpoint) const;
-
-    /**
-     * By making the copy constructor private, we prevent accidentally using it when one intends to create a cache on top of a base cache.
-     */
-    CCoinsViewCache(const CCoinsViewCache &);
 };
 
 //! Utility function to add all of a transaction's outputs to a cache.
diff --git a/src/compat/byteswap.h b/src/compat/byteswap.h
index 3c5a5c083..d93ff7413 100644
--- a/src/compat/byteswap.h
+++ b/src/compat/byteswap.h
@@ -35,7 +35,7 @@
 #if HAVE_DECL_BSWAP_16 == 0
 inline uint16_t bswap_16(uint16_t x)
 {
-    return (x >> 8) | ((x & 0x00ff) << 8);
+    return (x >> 8) | (x << 8);
 }
 #endif // HAVE_DECL_BSWAP16
 
diff --git a/src/compat/endian.h b/src/compat/endian.h
index 79d6b2fdb..dbf178f53 100644
--- a/src/compat/endian.h
+++ b/src/compat/endian.h
@@ -9,10 +9,10 @@
 #include "config/bitcoin-config.h"
 #endif
 
-#include <stdint.h>
-
 #include "compat/byteswap.h"
 
+#include <stdint.h>
+
 #if defined(HAVE_ENDIAN_H)
 #include <endian.h>
 #elif defined(HAVE_SYS_ENDIAN_H)
diff --git a/src/compressor.h b/src/compressor.h
index 015911484..094c1bcfe 100644
--- a/src/compressor.h
+++ b/src/compressor.h
@@ -53,7 +53,7 @@ class CScriptCompressor
     unsigned int GetSpecialSize(unsigned int nSize) const;
     bool Decompress(unsigned int nSize, const std::vector<unsigned char> &out);
 public:
-    CScriptCompressor(CScript &scriptIn) : script(scriptIn) { }
+    explicit CScriptCompressor(CScript &scriptIn) : script(scriptIn) { }
 
     template<typename Stream>
     void Serialize(Stream &s) const {
@@ -99,7 +99,7 @@ class CTxOutCompressor
     static uint64_t CompressAmount(uint64_t nAmount);
     static uint64_t DecompressAmount(uint64_t nAmount);
 
-    CTxOutCompressor(CTxOut &txoutIn) : txout(txoutIn) { }
+    explicit CTxOutCompressor(CTxOut &txoutIn) : txout(txoutIn) { }
 
     ADD_SERIALIZE_METHODS;
 
diff --git a/src/consensus/merkle.cpp b/src/consensus/merkle.cpp
index 1ce5a9d87..798ce4b5f 100644
--- a/src/consensus/merkle.cpp
+++ b/src/consensus/merkle.cpp
@@ -132,13 +132,13 @@ static void MerkleComputation(const std::vector<uint256>& leaves, uint256* proot
 
 uint256 ComputeMerkleRoot(const std::vector<uint256>& leaves, bool* mutated) {
     uint256 hash;
-    MerkleComputation(leaves, &hash, mutated, -1, NULL);
+    MerkleComputation(leaves, &hash, mutated, -1, nullptr);
     return hash;
 }
 
 std::vector<uint256> ComputeMerkleBranch(const std::vector<uint256>& leaves, uint32_t position) {
     std::vector<uint256> ret;
-    MerkleComputation(leaves, NULL, NULL, position, &ret);
+    MerkleComputation(leaves, nullptr, nullptr, position, &ret);
     return ret;
 }
 
diff --git a/src/consensus/merkle.h b/src/consensus/merkle.h
index 194aea9b7..33764c746 100644
--- a/src/consensus/merkle.h
+++ b/src/consensus/merkle.h
@@ -12,7 +12,7 @@
 #include "primitives/block.h"
 #include "uint256.h"
 
-uint256 ComputeMerkleRoot(const std::vector<uint256>& leaves, bool* mutated = NULL);
+uint256 ComputeMerkleRoot(const std::vector<uint256>& leaves, bool* mutated = nullptr);
 std::vector<uint256> ComputeMerkleBranch(const std::vector<uint256>& leaves, uint32_t position);
 uint256 ComputeMerkleRootFromBranch(const uint256& leaf, const std::vector<uint256>& branch, uint32_t position);
 
@@ -20,13 +20,13 @@ uint256 ComputeMerkleRootFromBranch(const uint256& leaf, const std::vector<uint2
  * Compute the Merkle root of the transactions in a block.
  * *mutated is set to true if a duplicated subtree was found.
  */
-uint256 BlockMerkleRoot(const CBlock& block, bool* mutated = NULL);
+uint256 BlockMerkleRoot(const CBlock& block, bool* mutated = nullptr);
 
 /*
  * Compute the Merkle root of the witness transactions in a block.
  * *mutated is set to true if a duplicated subtree was found.
  */
-uint256 BlockWitnessMerkleRoot(const CBlock& block, bool* mutated = NULL);
+uint256 BlockWitnessMerkleRoot(const CBlock& block, bool* mutated = nullptr);
 
 /*
  * Compute the Merkle branch for the tree of transactions in a block, for a
diff --git a/src/consensus/tx_verify.cpp b/src/consensus/tx_verify.cpp
index e4f832445..d00385cab 100644
--- a/src/consensus/tx_verify.cpp
+++ b/src/consensus/tx_verify.cpp
@@ -13,7 +13,7 @@
 #include "chain.h"
 #include "coins.h"
 #include "utilmoneystr.h"
- 
+
 bool IsFinalTx(const CTransaction &tx, int nBlockHeight, int64_t nBlockTime)
 {
     if (tx.nLockTime == 0)
@@ -205,46 +205,46 @@ bool CheckTransaction(const CTransaction& tx, CValidationState &state, bool fChe
     return true;
 }
 
-bool Consensus::CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight)
+bool Consensus::CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight, CAmount& txfee)
 {
-        // This doesn't trigger the DoS code on purpose; if it did, it would make it easier
-        // for an attacker to attempt to split the network.
-        if (!inputs.HaveInputs(tx))
-            return state.Invalid(false, 0, "", "Inputs unavailable");
-
-        CAmount nValueIn = 0;
-        CAmount nFees = 0;
-        for (unsigned int i = 0; i < tx.vin.size(); i++)
-        {
-            const COutPoint &prevout = tx.vin[i].prevout;
-            const Coin& coin = inputs.AccessCoin(prevout);
-            assert(!coin.IsSpent());
-
-            // If prev is coinbase, check that it's matured
-            if (coin.IsCoinBase()) {
-                if (nSpendHeight - coin.nHeight < COINBASE_MATURITY)
-                    return state.Invalid(false,
-                        REJECT_INVALID, "bad-txns-premature-spend-of-coinbase",
-                        strprintf("tried to spend coinbase at depth %d", nSpendHeight - coin.nHeight));
-            }
-
-            // Check for negative or overflow input values
-            nValueIn += coin.out.nValue;
-            if (!MoneyRange(coin.out.nValue) || !MoneyRange(nValueIn))
-                return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputvalues-outofrange");
+    // are the actual inputs available?
+    if (!inputs.HaveInputs(tx)) {
+        return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputs-missingorspent", false,
+                         strprintf("%s: inputs missing/spent", __func__));
+    }
+
+    CAmount nValueIn = 0;
+    for (unsigned int i = 0; i < tx.vin.size(); ++i) {
+        const COutPoint &prevout = tx.vin[i].prevout;
+        const Coin& coin = inputs.AccessCoin(prevout);
+        assert(!coin.IsSpent());
+
+        // If prev is coinbase, check that it's matured
+        if (coin.IsCoinBase() && nSpendHeight - coin.nHeight < COINBASE_MATURITY) {
+            return state.Invalid(false,
+                REJECT_INVALID, "bad-txns-premature-spend-of-coinbase",
+                strprintf("tried to spend coinbase at depth %d", nSpendHeight - coin.nHeight));
+        }
 
+        // Check for negative or overflow input values
+        nValueIn += coin.out.nValue;
+        if (!MoneyRange(coin.out.nValue) || !MoneyRange(nValueIn)) {
+            return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputvalues-outofrange");
         }
+    }
+
+    const CAmount value_out = tx.GetValueOut();
+    if (nValueIn < value_out) {
+        return state.DoS(100, false, REJECT_INVALID, "bad-txns-in-belowout", false,
+            strprintf("value in (%s) < value out (%s)", FormatMoney(nValueIn), FormatMoney(value_out)));
+    }
+
+    // Tally transaction fees
+    const CAmount txfee_aux = nValueIn - value_out;
+    if (!MoneyRange(txfee_aux)) {
+        return state.DoS(100, false, REJECT_INVALID, "bad-txns-fee-outofrange");
+    }
 
-        if (nValueIn < tx.GetValueOut())
-            return state.DoS(100, false, REJECT_INVALID, "bad-txns-in-belowout", false,
-                strprintf("value in (%s) < value out (%s)", FormatMoney(nValueIn), FormatMoney(tx.GetValueOut())));
-
-        // Tally transaction fees
-        CAmount nTxFee = nValueIn - tx.GetValueOut();
-        if (nTxFee < 0)
-            return state.DoS(100, false, REJECT_INVALID, "bad-txns-fee-negative");
-        nFees += nTxFee;
-        if (!MoneyRange(nFees))
-            return state.DoS(100, false, REJECT_INVALID, "bad-txns-fee-outofrange");
+    txfee = txfee_aux;
     return true;
 }
diff --git a/src/consensus/tx_verify.h b/src/consensus/tx_verify.h
index d46d3294c..288892462 100644
--- a/src/consensus/tx_verify.h
+++ b/src/consensus/tx_verify.h
@@ -5,6 +5,8 @@
 #ifndef BITCOIN_CONSENSUS_TX_VERIFY_H
 #define BITCOIN_CONSENSUS_TX_VERIFY_H
 
+#include "amount.h"
+
 #include <stdint.h>
 #include <vector>
 
@@ -22,9 +24,10 @@ namespace Consensus {
 /**
  * Check whether all inputs of this transaction are valid (no double spends and amounts)
  * This does not modify the UTXO set. This does not check scripts and sigs.
+ * @param[out] txfee Set to the transaction fee if successful.
  * Preconditions: tx.IsCoinBase() is false.
  */
-bool CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight);
+bool CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight, CAmount& txfee);
 } // namespace Consensus
 
 /** Auxiliary functions for transaction validation (ideally should not be exposed) */
diff --git a/src/consensus/validation.h b/src/consensus/validation.h
index 5494ce40e..b6740c9d9 100644
--- a/src/consensus/validation.h
+++ b/src/consensus/validation.h
@@ -89,17 +89,16 @@ class CValidationState {
     std::string GetDebugMessage() const { return strDebugMessage; }
 };
 
+// These implement the weight = (stripped_size * 4) + witness_size formula,
+// using only serialization with and without witness data. As witness_size
+// is equal to total_size - stripped_size, this formula is identical to:
+// weight = (stripped_size * 3) + total_size.
 static inline int64_t GetTransactionWeight(const CTransaction& tx)
 {
-    return ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR -1) + ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
+    return ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR - 1) + ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
 }
-
 static inline int64_t GetBlockWeight(const CBlock& block)
 {
-    // This implements the weight = (stripped_size * 4) + witness_size formula,
-    // using only serialization with and without witness data. As witness_size
-    // is equal to total_size - stripped_size, this formula is identical to:
-    // weight = (stripped_size * 3) + total_size.
     return ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR - 1) + ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION);
 }
 
diff --git a/src/core_io.h b/src/core_io.h
index 3f25faf0e..ccc72ebb3 100644
--- a/src/core_io.h
+++ b/src/core_io.h
@@ -31,6 +31,6 @@ UniValue ValueFromAmount(const CAmount& amount);
 std::string FormatScript(const CScript& script);
 std::string EncodeHexTx(const CTransaction& tx, const int serializeFlags = 0);
 void ScriptPubKeyToUniv(const CScript& scriptPubKey, UniValue& out, bool fIncludeHex);
-void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry);
+void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex = true, int serialize_flags = 0);
 
 #endif // BITCOIN_CORE_IO_H
diff --git a/src/core_write.cpp b/src/core_write.cpp
index 217b491a0..e16db1365 100644
--- a/src/core_write.cpp
+++ b/src/core_write.cpp
@@ -102,7 +102,7 @@ std::string ScriptToAsmStr(const CScript& script, const bool fAttemptSighashDeco
                     // this won't decode correctly formatted public keys in Pubkey or Multisig scripts due to
                     // the restrictions on the pubkey formats (see IsCompressedOrUncompressedPubKey) being incongruous with the
                     // checks in CheckSignatureEncoding.
-                    if (CheckSignatureEncoding(vch, SCRIPT_VERIFY_STRICTENC, NULL)) {
+                    if (CheckSignatureEncoding(vch, SCRIPT_VERIFY_STRICTENC, nullptr)) {
                         const unsigned char chSigHashType = vch.back();
                         if (mapSigHashTypes.count(chSigHashType)) {
                             strSigHashDecode = "[" + mapSigHashTypes.find(chSigHashType)->second + "]";
@@ -148,12 +148,13 @@ void ScriptPubKeyToUniv(const CScript& scriptPubKey,
     out.pushKV("type", GetTxnOutputType(type));
 
     UniValue a(UniValue::VARR);
-    for (const CTxDestination& addr : addresses)
-        a.push_back(CBitcoinAddress(addr).ToString());
+    for (const CTxDestination& addr : addresses) {
+        a.push_back(EncodeDestination(addr));
+    }
     out.pushKV("addresses", a);
 }
 
-void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry)
+void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex, int serialize_flags)
 {
     entry.pushKV("txid", tx.GetHash().GetHex());
     entry.pushKV("hash", tx.GetWitnessHash().GetHex());
@@ -207,5 +208,7 @@ void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry)
     if (!hashBlock.IsNull())
         entry.pushKV("blockhash", hashBlock.GetHex());
 
-    entry.pushKV("hex", EncodeHexTx(tx)); // the hex-encoded transaction. used the name "hex" to be consistent with the verbose output of "getrawtransaction".
+    if (include_hex) {
+        entry.pushKV("hex", EncodeHexTx(tx, serialize_flags)); // the hex-encoded transaction. used the name "hex" to be consistent with the verbose output of "getrawtransaction".
+    }
 }
diff --git a/src/crypto/aes.h b/src/crypto/aes.h
index e9f1b52e7..a7b63b19d 100644
--- a/src/crypto/aes.h
+++ b/src/crypto/aes.h
@@ -22,7 +22,7 @@ class AES128Encrypt
     AES128_ctx ctx;
 
 public:
-    AES128Encrypt(const unsigned char key[16]);
+    explicit AES128Encrypt(const unsigned char key[16]);
     ~AES128Encrypt();
     void Encrypt(unsigned char ciphertext[16], const unsigned char plaintext[16]) const;
 };
@@ -34,7 +34,7 @@ class AES128Decrypt
     AES128_ctx ctx;
 
 public:
-    AES128Decrypt(const unsigned char key[16]);
+    explicit AES128Decrypt(const unsigned char key[16]);
     ~AES128Decrypt();
     void Decrypt(unsigned char plaintext[16], const unsigned char ciphertext[16]) const;
 };
@@ -46,7 +46,7 @@ class AES256Encrypt
     AES256_ctx ctx;
 
 public:
-    AES256Encrypt(const unsigned char key[32]);
+    explicit AES256Encrypt(const unsigned char key[32]);
     ~AES256Encrypt();
     void Encrypt(unsigned char ciphertext[16], const unsigned char plaintext[16]) const;
 };
@@ -58,7 +58,7 @@ class AES256Decrypt
     AES256_ctx ctx;
 
 public:
-    AES256Decrypt(const unsigned char key[32]);
+    explicit AES256Decrypt(const unsigned char key[32]);
     ~AES256Decrypt();
     void Decrypt(unsigned char plaintext[16], const unsigned char ciphertext[16]) const;
 };
diff --git a/src/crypto/chacha20.cpp b/src/crypto/chacha20.cpp
index 816ae870e..4038ae9f8 100644
--- a/src/crypto/chacha20.cpp
+++ b/src/crypto/chacha20.cpp
@@ -75,7 +75,7 @@ void ChaCha20::Output(unsigned char* c, size_t bytes)
 {
     uint32_t x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
     uint32_t j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
-    unsigned char *ctarget = NULL;
+    unsigned char *ctarget = nullptr;
     unsigned char tmp[64];
     unsigned int i;
 
diff --git a/src/crypto/common.h b/src/crypto/common.h
index bcca3d30e..bd9bc9420 100644
--- a/src/crypto/common.h
+++ b/src/crypto/common.h
@@ -6,7 +6,7 @@
 #define BITCOIN_CRYPTO_COMMON_H
 
 #if defined(HAVE_CONFIG_H)
-#include "bitcoin-config.h"
+#include "config/bitcoin-config.h"
 #endif
 
 #include <stdint.h>
diff --git a/src/crypto/hmac_sha256.h b/src/crypto/hmac_sha256.h
index 1519c1457..8c42fcfe1 100644
--- a/src/crypto/hmac_sha256.h
+++ b/src/crypto/hmac_sha256.h
@@ -10,7 +10,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-/** A hasher class for HMAC-SHA-512. */
+/** A hasher class for HMAC-SHA-256. */
 class CHMAC_SHA256
 {
 private:
diff --git a/src/crypto/sha256.cpp b/src/crypto/sha256.cpp
index 15d6db90c..29afe86ec 100644
--- a/src/crypto/sha256.cpp
+++ b/src/crypto/sha256.cpp
@@ -10,7 +10,7 @@
 #include <atomic>
 
 #if defined(__x86_64__) || defined(__amd64__)
-#if defined(EXPERIMENTAL_ASM)
+#if defined(USE_ASM)
 #include <cpuid.h>
 namespace sha256_sse4
 {
@@ -178,7 +178,7 @@ TransformType Transform = sha256::Transform;
 
 std::string SHA256AutoDetect()
 {
-#if defined(EXPERIMENTAL_ASM) && (defined(__x86_64__) || defined(__amd64__))
+#if defined(USE_ASM) && (defined(__x86_64__) || defined(__amd64__))
     uint32_t eax, ebx, ecx, edx;
     if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) && (ecx >> 19) & 1) {
         Transform = sha256_sse4::Transform;
diff --git a/src/cuckoocache.h b/src/cuckoocache.h
index fd24d05ee..947e1a718 100644
--- a/src/cuckoocache.h
+++ b/src/cuckoocache.h
@@ -2,8 +2,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef _BITCOIN_CUCKOOCACHE_H_
-#define _BITCOIN_CUCKOOCACHE_H_
+#ifndef BITCOIN_CUCKOOCACHE_H
+#define BITCOIN_CUCKOOCACHE_H
 
 #include <array>
 #include <algorithm>
@@ -58,7 +58,7 @@ class bit_packed_atomic_flags
      * @post All calls to bit_is_set (without subsequent bit_unset) will return
      * true.
      */
-    bit_packed_atomic_flags(uint32_t size)
+    explicit bit_packed_atomic_flags(uint32_t size)
     {
         // pad out the size if needed
         size = (size + 7) / 8;
@@ -478,4 +478,4 @@ class cache
 };
 } // namespace CuckooCache
 
-#endif
+#endif // BITCOIN_CUCKOOCACHE_H
diff --git a/src/dbwrapper.cpp b/src/dbwrapper.cpp
index 3626e0177..dfc90f3ab 100644
--- a/src/dbwrapper.cpp
+++ b/src/dbwrapper.cpp
@@ -19,7 +19,7 @@ class CBitcoinLevelDBLogger : public leveldb::Logger {
 public:
     // This code is adapted from posix_logger.h, which is why it is using vsprintf.
     // Please do not do this in normal code
-    virtual void Logv(const char * format, va_list ap) override {
+    void Logv(const char * format, va_list ap) override {
             if (!LogAcceptCategory(BCLog::LEVELDB)) {
                 return;
             }
@@ -92,7 +92,7 @@ static leveldb::Options GetOptions(size_t nCacheSize)
 
 CDBWrapper::CDBWrapper(const fs::path& path, size_t nCacheSize, bool fMemory, bool fWipe, bool obfuscate)
 {
-    penv = NULL;
+    penv = nullptr;
     readoptions.verify_checksums = true;
     iteroptions.verify_checksums = true;
     iteroptions.fill_cache = false;
@@ -115,7 +115,7 @@ CDBWrapper::CDBWrapper(const fs::path& path, size_t nCacheSize, bool fMemory, bo
     dbwrapper_private::HandleError(status);
     LogPrintf("Opened LevelDB successfully\n");
 
-    if (GetBoolArg("-forcecompactdb", false)) {
+    if (gArgs.GetBoolArg("-forcecompactdb", false)) {
         LogPrintf("Starting database compaction of %s\n", path.string());
         pdb->CompactRange(nullptr, nullptr);
         LogPrintf("Finished database compaction of %s\n", path.string());
@@ -144,15 +144,15 @@ CDBWrapper::CDBWrapper(const fs::path& path, size_t nCacheSize, bool fMemory, bo
 CDBWrapper::~CDBWrapper()
 {
     delete pdb;
-    pdb = NULL;
+    pdb = nullptr;
     delete options.filter_policy;
-    options.filter_policy = NULL;
+    options.filter_policy = nullptr;
     delete options.info_log;
-    options.info_log = NULL;
+    options.info_log = nullptr;
     delete options.block_cache;
-    options.block_cache = NULL;
+    options.block_cache = nullptr;
     delete penv;
-    options.env = NULL;
+    options.env = nullptr;
 }
 
 bool CDBWrapper::WriteBatch(CDBBatch& batch, bool fSync)
@@ -190,7 +190,7 @@ bool CDBWrapper::IsEmpty()
 }
 
 CDBIterator::~CDBIterator() { delete piter; }
-bool CDBIterator::Valid() { return piter->Valid(); }
+bool CDBIterator::Valid() const { return piter->Valid(); }
 void CDBIterator::SeekToFirst() { piter->SeekToFirst(); }
 void CDBIterator::Next() { piter->Next(); }
 
diff --git a/src/dbwrapper.h b/src/dbwrapper.h
index d36188652..e19fde51c 100644
--- a/src/dbwrapper.h
+++ b/src/dbwrapper.h
@@ -22,7 +22,7 @@ static const size_t DBWRAPPER_PREALLOC_VALUE_SIZE = 1024;
 class dbwrapper_error : public std::runtime_error
 {
 public:
-    dbwrapper_error(const std::string& msg) : std::runtime_error(msg) {}
+    explicit dbwrapper_error(const std::string& msg) : std::runtime_error(msg) {}
 };
 
 class CDBWrapper;
@@ -61,7 +61,7 @@ class CDBBatch
     /**
      * @param[in] _parent   CDBWrapper that this batch is to be submitted to
      */
-    CDBBatch(const CDBWrapper &_parent) : parent(_parent), ssKey(SER_DISK, CLIENT_VERSION), ssValue(SER_DISK, CLIENT_VERSION), size_estimate(0) { };
+    explicit CDBBatch(const CDBWrapper &_parent) : parent(_parent), ssKey(SER_DISK, CLIENT_VERSION), ssValue(SER_DISK, CLIENT_VERSION), size_estimate(0) { };
 
     void Clear()
     {
@@ -130,7 +130,7 @@ class CDBIterator
         parent(_parent), piter(_piter) { };
     ~CDBIterator();
 
-    bool Valid();
+    bool Valid() const;
 
     void SeekToFirst();
 
@@ -177,7 +177,7 @@ class CDBWrapper
 {
     friend const std::vector<unsigned char>& dbwrapper_private::GetObfuscateKey(const CDBWrapper &w);
 private:
-    //! custom environment this database is using (may be NULL in case of default environment)
+    //! custom environment this database is using (may be nullptr in case of default environment)
     leveldb::Env* penv;
 
     //! database options used
diff --git a/src/hash.h b/src/hash.h
index b9952d39f..474b13d65 100644
--- a/src/hash.h
+++ b/src/hash.h
@@ -88,20 +88,6 @@ inline uint256 Hash(const T1 p1begin, const T1 p1end,
     return result;
 }
 
-/** Compute the 256-bit hash of the concatenation of three objects. */
-template<typename T1, typename T2, typename T3>
-inline uint256 Hash(const T1 p1begin, const T1 p1end,
-                    const T2 p2begin, const T2 p2end,
-                    const T3 p3begin, const T3 p3end) {
-    static const unsigned char pblank[1] = {};
-    uint256 result;
-    CHash256().Write(p1begin == p1end ? pblank : (const unsigned char*)&p1begin[0], (p1end - p1begin) * sizeof(p1begin[0]))
-              .Write(p2begin == p2end ? pblank : (const unsigned char*)&p2begin[0], (p2end - p2begin) * sizeof(p2begin[0]))
-              .Write(p3begin == p3end ? pblank : (const unsigned char*)&p3begin[0], (p3end - p3begin) * sizeof(p3begin[0]))
-              .Finalize((unsigned char*)&result);
-    return result;
-}
-
 /** Compute the 160-bit hash an object. */
 template<typename T1>
 inline uint160 Hash160(const T1 pbegin, const T1 pend)
@@ -168,7 +154,7 @@ class CHashVerifier : public CHashWriter
     Source* source;
 
 public:
-    CHashVerifier(Source* source_) : CHashWriter(source_->GetType(), source_->GetVersion()), source(source_) {}
+    explicit CHashVerifier(Source* source_) : CHashWriter(source_->GetType(), source_->GetVersion()), source(source_) {}
 
     void read(char* pch, size_t nSize)
     {
diff --git a/src/httprpc.cpp b/src/httprpc.cpp
index 68a7eb5e0..6bfd3b0fd 100644
--- a/src/httprpc.cpp
+++ b/src/httprpc.cpp
@@ -43,7 +43,7 @@ class HTTPRPCTimer : public RPCTimerBase
 class HTTPRPCTimerInterface : public RPCTimerInterface
 {
 public:
-    HTTPRPCTimerInterface(struct event_base* _base) : base(_base)
+    explicit HTTPRPCTimerInterface(struct event_base* _base) : base(_base)
     {
     }
     const char* Name() override
@@ -62,7 +62,7 @@ class HTTPRPCTimerInterface : public RPCTimerInterface
 /* Pre-base64-encoded authentication token */
 static std::string strRPCUserColonPass;
 /* Stored RPC timer interface (for unregistration) */
-static HTTPRPCTimerInterface* httpRPCTimerInterface = 0;
+static HTTPRPCTimerInterface* httpRPCTimerInterface = nullptr;
 
 static void JSONErrorReply(HTTPRequest* req, const UniValue& objError, const UniValue& id)
 {
@@ -189,7 +189,7 @@ static bool HTTPReq_JSONRPC(HTTPRequest* req, const std::string &)
 
         // array of requests
         } else if (valRequest.isArray())
-            strReply = JSONRPCExecBatch(valRequest.get_array());
+            strReply = JSONRPCExecBatch(jreq, valRequest.get_array());
         else
             throw JSONRPCError(RPC_PARSE_ERROR, "Top-level object parse error");
 
@@ -207,7 +207,7 @@ static bool HTTPReq_JSONRPC(HTTPRequest* req, const std::string &)
 
 static bool InitRPCAuthentication()
 {
-    if (GetArg("-rpcpassword", "") == "")
+    if (gArgs.GetArg("-rpcpassword", "") == "")
     {
         LogPrintf("No rpcpassword set - using random cookie authentication\n");
         if (!GenerateAuthCookie(&strRPCUserColonPass)) {
@@ -218,7 +218,7 @@ static bool InitRPCAuthentication()
         }
     } else {
         LogPrintf("Config options rpcuser and rpcpassword will soon be deprecated. Locally-run instances may remove rpcuser to use cookie-based auth, or may be replaced with rpcauth. Please see share/rpcuser for rpcauth auth generation.\n");
-        strRPCUserColonPass = GetArg("-rpcuser", "") + ":" + GetArg("-rpcpassword", "");
+        strRPCUserColonPass = gArgs.GetArg("-rpcuser", "") + ":" + gArgs.GetArg("-rpcpassword", "");
     }
     return true;
 }
@@ -252,6 +252,6 @@ void StopHTTPRPC()
     if (httpRPCTimerInterface) {
         RPCUnsetTimerInterface(httpRPCTimerInterface);
         delete httpRPCTimerInterface;
-        httpRPCTimerInterface = 0;
+        httpRPCTimerInterface = nullptr;
     }
 }
diff --git a/src/httpserver.cpp b/src/httpserver.cpp
index ba0125540..31b6a3705 100644
--- a/src/httpserver.cpp
+++ b/src/httpserver.cpp
@@ -40,7 +40,7 @@
 static const size_t MAX_HEADERS_SIZE = 8192;
 
 /** HTTP request work item */
-class HTTPWorkItem : public HTTPClosure
+class HTTPWorkItem final : public HTTPClosure
 {
 public:
     HTTPWorkItem(std::unique_ptr<HTTPRequest> _req, const std::string &_path, const HTTPRequestHandler& _func):
@@ -79,7 +79,7 @@ class WorkQueue
     {
     public:
         WorkQueue &wq;
-        ThreadCounter(WorkQueue &w): wq(w)
+        explicit ThreadCounter(WorkQueue &w): wq(w)
         {
             std::lock_guard<std::mutex> lock(wq.cs);
             wq.numThreads += 1;
@@ -93,7 +93,7 @@ class WorkQueue
     };
 
 public:
-    WorkQueue(size_t _maxDepth) : running(true),
+    explicit WorkQueue(size_t _maxDepth) : running(true),
                                  maxDepth(_maxDepth),
                                  numThreads(0)
     {
@@ -164,13 +164,13 @@ struct HTTPPathHandler
 /** HTTP module state */
 
 //! libevent event loop
-static struct event_base* eventBase = 0;
+static struct event_base* eventBase = nullptr;
 //! HTTP server
-struct evhttp* eventHTTP = 0;
+struct evhttp* eventHTTP = nullptr;
 //! List of subnets to allow RPC connections from
 static std::vector<CSubNet> rpc_allow_subnets;
 //! Work queue for handling longer requests off the event loop thread
-static WorkQueue<HTTPClosure>* workQueue = 0;
+static WorkQueue<HTTPClosure>* workQueue = nullptr;
 //! Handlers for (sub)paths
 std::vector<HTTPPathHandler> pathHandlers;
 //! Bound listening sockets
@@ -292,7 +292,7 @@ static void http_request_cb(struct evhttp_request* req, void* arg)
 static void http_reject_request_cb(struct evhttp_request* req, void*)
 {
     LogPrint(BCLog::HTTP, "Rejecting request while shutting down\n");
-    evhttp_send_error(req, HTTP_SERVUNAVAIL, NULL);
+    evhttp_send_error(req, HTTP_SERVUNAVAIL, nullptr);
 }
 
 /** Event dispatcher thread */
@@ -309,14 +309,14 @@ static bool ThreadHTTP(struct event_base* base, struct evhttp* http)
 /** Bind HTTP server to specified addresses */
 static bool HTTPBindAddresses(struct evhttp* http)
 {
-    int defaultPort = GetArg("-rpcport", BaseParams().RPCPort());
+    int defaultPort = gArgs.GetArg("-rpcport", BaseParams().RPCPort());
     std::vector<std::pair<std::string, uint16_t> > endpoints;
 
     // Determine what addresses to bind to
-    if (!IsArgSet("-rpcallowip")) { // Default to loopback if not allowing external IPs
+    if (!gArgs.IsArgSet("-rpcallowip")) { // Default to loopback if not allowing external IPs
         endpoints.push_back(std::make_pair("::1", defaultPort));
         endpoints.push_back(std::make_pair("127.0.0.1", defaultPort));
-        if (IsArgSet("-rpcbind")) {
+        if (gArgs.IsArgSet("-rpcbind")) {
             LogPrintf("WARNING: option -rpcbind was ignored because -rpcallowip was not specified, refusing to allow everyone to connect\n");
         }
     } else if (gArgs.IsArgSet("-rpcbind")) { // Specific bind address
@@ -334,7 +334,7 @@ static bool HTTPBindAddresses(struct evhttp* http)
     // Bind addresses
     for (std::vector<std::pair<std::string, uint16_t> >::iterator i = endpoints.begin(); i != endpoints.end(); ++i) {
         LogPrint(BCLog::HTTP, "Binding RPC on address %s port %i\n", i->first, i->second);
-        evhttp_bound_socket *bind_handle = evhttp_bind_socket_with_handle(http, i->first.empty() ? NULL : i->first.c_str(), i->second);
+        evhttp_bound_socket *bind_handle = evhttp_bind_socket_with_handle(http, i->first.empty() ? nullptr : i->first.c_str(), i->second);
         if (bind_handle) {
             boundSockets.push_back(bind_handle);
         } else {
@@ -369,7 +369,7 @@ bool InitHTTPServer()
     if (!InitHTTPAllowList())
         return false;
 
-    if (GetBoolArg("-rpcssl", false)) {
+    if (gArgs.GetBoolArg("-rpcssl", false)) {
         uiInterface.ThreadSafeMessageBox(
             "SSL mode for RPC (-rpcssl) is no longer supported.",
             "", CClientUIInterface::MSG_ERROR);
@@ -401,10 +401,10 @@ bool InitHTTPServer()
         return false;
     }
 
-    evhttp_set_timeout(http, GetArg("-rpcservertimeout", DEFAULT_HTTP_SERVER_TIMEOUT));
+    evhttp_set_timeout(http, gArgs.GetArg("-rpcservertimeout", DEFAULT_HTTP_SERVER_TIMEOUT));
     evhttp_set_max_headers_size(http, MAX_HEADERS_SIZE);
     evhttp_set_max_body_size(http, MAX_SIZE);
-    evhttp_set_gencb(http, http_request_cb, NULL);
+    evhttp_set_gencb(http, http_request_cb, nullptr);
 
     if (!HTTPBindAddresses(http)) {
         LogPrintf("Unable to bind any endpoint for RPC server\n");
@@ -412,11 +412,11 @@ bool InitHTTPServer()
     }
 
     LogPrint(BCLog::HTTP, "Initialized HTTP server\n");
-    int workQueueDepth = std::max((long)GetArg("-rpcworkqueue", DEFAULT_HTTP_WORKQUEUE), 1L);
+    int workQueueDepth = std::max((long)gArgs.GetArg("-rpcworkqueue", DEFAULT_HTTP_WORKQUEUE), 1L);
     LogPrintf("HTTP: creating work queue of depth %d\n", workQueueDepth);
 
     workQueue = new WorkQueue<HTTPClosure>(workQueueDepth);
-    // tranfer ownership to eventBase/HTTP via .release()
+    // transfer ownership to eventBase/HTTP via .release()
     eventBase = base_ctr.release();
     eventHTTP = http_ctr.release();
     return true;
@@ -442,7 +442,7 @@ std::future<bool> threadResult;
 bool StartHTTPServer()
 {
     LogPrint(BCLog::HTTP, "Starting HTTP server\n");
-    int rpcThreads = std::max((long)GetArg("-rpcthreads", DEFAULT_HTTP_THREADS), 1L);
+    int rpcThreads = std::max((long)gArgs.GetArg("-rpcthreads", DEFAULT_HTTP_THREADS), 1L);
     LogPrintf("HTTP: starting %d worker threads\n", rpcThreads);
     std::packaged_task<bool(event_base*, evhttp*)> task(ThreadHTTP);
     threadResult = task.get_future();
@@ -464,7 +464,7 @@ void InterruptHTTPServer()
             evhttp_del_accept_socket(eventHTTP, socket);
         }
         // Reject requests on current connections
-        evhttp_set_gencb(eventHTTP, http_reject_request_cb, NULL);
+        evhttp_set_gencb(eventHTTP, http_reject_request_cb, nullptr);
     }
     if (workQueue)
         workQueue->Interrupt();
@@ -481,6 +481,8 @@ void StopHTTPServer()
     }
     if (eventBase) {
         LogPrint(BCLog::HTTP, "Waiting for HTTP event thread to exit\n");
+        // Exit the event loop as soon as there are no active events.
+        event_base_loopexit(eventBase, nullptr);
         // Give event loop a few seconds to exit (to send back last RPC responses), then break it
         // Before this was solved with event_base_loopexit, but that didn't work as expected in
         // at least libevent 2.0.21 and always introduced a delay. In libevent
@@ -495,11 +497,11 @@ void StopHTTPServer()
     }
     if (eventHTTP) {
         evhttp_free(eventHTTP);
-        eventHTTP = 0;
+        eventHTTP = nullptr;
     }
     if (eventBase) {
         event_base_free(eventBase);
-        eventBase = 0;
+        eventBase = nullptr;
     }
     LogPrint(BCLog::HTTP, "Stopped HTTP server\n");
 }
@@ -530,7 +532,7 @@ HTTPEvent::~HTTPEvent()
 }
 void HTTPEvent::trigger(struct timeval* tv)
 {
-    if (tv == NULL)
+    if (tv == nullptr)
         event_active(ev, 0, 0); // immediately trigger event in main thread
     else
         evtimer_add(ev, tv); // trigger after timeval passed
@@ -573,7 +575,7 @@ std::string HTTPRequest::ReadBody()
      * abstraction to consume the evbuffer on the fly in the parsing algorithm.
      */
     const char* data = (const char*)evbuffer_pullup(buf, size);
-    if (!data) // returns NULL in case of empty buffer
+    if (!data) // returns nullptr in case of empty buffer
         return "";
     std::string rv(data, size);
     evbuffer_drain(buf, size);
@@ -600,10 +602,10 @@ void HTTPRequest::WriteReply(int nStatus, const std::string& strReply)
     assert(evb);
     evbuffer_add(evb, strReply.data(), strReply.size());
     HTTPEvent* ev = new HTTPEvent(eventBase, true,
-        std::bind(evhttp_send_reply, req, nStatus, (const char*)NULL, (struct evbuffer *)NULL));
-    ev->trigger(0);
+        std::bind(evhttp_send_reply, req, nStatus, (const char*)nullptr, (struct evbuffer *)nullptr));
+    ev->trigger(nullptr);
     replySent = true;
-    req = 0; // transferred back to main thread
+    req = nullptr; // transferred back to main thread
 }
 
 CService HTTPRequest::GetPeer()
@@ -669,7 +671,7 @@ void UnregisterHTTPHandler(const std::string &prefix, bool exactMatch)
 std::string urlDecode(const std::string &urlEncoded) {
     std::string res;
     if (!urlEncoded.empty()) {
-        char *decoded = evhttp_uridecode(urlEncoded.c_str(), false, NULL);
+        char *decoded = evhttp_uridecode(urlEncoded.c_str(), false, nullptr);
         if (decoded) {
             res = std::string(decoded);
             free(decoded);
diff --git a/src/httpserver.h b/src/httpserver.h
index 3e434bf0a..91ce5b4e0 100644
--- a/src/httpserver.h
+++ b/src/httpserver.h
@@ -61,7 +61,7 @@ class HTTPRequest
     bool replySent;
 
 public:
-    HTTPRequest(struct evhttp_request* req);
+    explicit HTTPRequest(struct evhttp_request* req);
     ~HTTPRequest();
 
     enum RequestMethod {
diff --git a/src/init.cpp b/src/init.cpp
index 1180dd4cb..3c08d6982 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -30,6 +30,7 @@
 #include "policy/policy.h"
 #include "rpc/server.h"
 #include "rpc/register.h"
+#include "rpc/safemode.h"
 #include "rpc/blockchain.h"
 #include "script/standard.h"
 #include "script/sigcache.h"
@@ -43,7 +44,7 @@
 #include "utilmoneystr.h"
 #include "validationinterface.h"
 #ifdef ENABLE_WALLET
-#include "wallet/wallet.h"
+#include "wallet/init.h"
 #endif
 #include "warnings.h"
 #include <stdint.h>
@@ -69,14 +70,13 @@
 bool fFeeEstimatesInitialized = false;
 static const bool DEFAULT_PROXYRANDOMIZE = true;
 static const bool DEFAULT_REST_ENABLE = false;
-static const bool DEFAULT_DISABLE_SAFEMODE = false;
 static const bool DEFAULT_STOPAFTERBLOCKIMPORT = false;
 
 std::unique_ptr<CConnman> g_connman;
 std::unique_ptr<PeerLogicValidation> peerLogic;
 
 #if ENABLE_ZMQ
-static CZMQNotificationInterface* pzmqNotificationInterface = NULL;
+static CZMQNotificationInterface* pzmqNotificationInterface = nullptr;
 #endif
 
 #ifdef WIN32
@@ -102,12 +102,11 @@ static const char* FEE_ESTIMATES_FILENAME="fee_estimates.dat";
 // created by AppInit() or the Qt main() function.
 //
 // A clean exit happens when StartShutdown() or the SIGTERM
-// signal handler sets fRequestShutdown, which triggers
-// the DetectShutdownThread(), which interrupts the main thread group.
-// DetectShutdownThread() then exits, which causes AppInit() to
-// continue (it .joins the shutdown thread).
-// Shutdown() is then
-// called to clean up database connections, and stop other
+// signal handler sets fRequestShutdown, which makes main thread's
+// WaitForShutdown() interrupts the thread group.
+// And then, WaitForShutdown() makes all other on-going threads
+// in the thread group join the main thread.
+// Shutdown() is then called to clean up database connections, and stop other
 // threads that should only be stopped after the main network-processing
 // threads have exited.
 //
@@ -133,10 +132,10 @@ bool ShutdownRequested()
  * chainstate, while keeping user interface out of the common library, which is shared
  * between bitcoind, and bitcoin-qt and non-server tools.
 */
-class CCoinsViewErrorCatcher : public CCoinsViewBacked
+class CCoinsViewErrorCatcher final : public CCoinsViewBacked
 {
 public:
-    CCoinsViewErrorCatcher(CCoinsView* view) : CCoinsViewBacked(view) {}
+    explicit CCoinsViewErrorCatcher(CCoinsView* view) : CCoinsViewBacked(view) {}
     bool GetCoin(const COutPoint &outpoint, Coin &coin) const override {
         try {
             return CCoinsViewBacked::GetCoin(outpoint, coin);
@@ -153,7 +152,7 @@ class CCoinsViewErrorCatcher : public CCoinsViewBacked
     // Writes do not need similar protection, as failure to write is handled by the caller.
 };
 
-static CCoinsViewErrorCatcher *pcoinscatcher = NULL;
+static CCoinsViewErrorCatcher *pcoinscatcher = nullptr;
 static std::unique_ptr<ECCVerifyHandle> globalVerifyHandle;
 
 void Interrupt(boost::thread_group& threadGroup)
@@ -188,18 +187,19 @@ void Shutdown()
     StopRPC();
     StopHTTPServer();
 #ifdef ENABLE_WALLET
-    for (CWalletRef pwallet : vpwallets) {
-        pwallet->Flush(false);
-    }
+    FlushWallets();
 #endif
     MapPort(false);
+
+    // Because these depend on each-other, we make sure that neither can be
+    // using the other before destroying them.
     UnregisterValidationInterface(peerLogic.get());
+    if(g_connman) g_connman->Stop();
     peerLogic.reset();
     g_connman.reset();
 
     StopTorControl();
-    UnregisterNodeSignals(GetNodeSignals());
-    if (fDumpMempoolLater && GetArg("-persistmempool", DEFAULT_PERSIST_MEMPOOL)) {
+    if (fDumpMempoolLater && gArgs.GetArg("-persistmempool", DEFAULT_PERSIST_MEMPOOL)) {
         DumpMempool();
     }
 
@@ -232,29 +232,27 @@ void Shutdown()
 
     {
         LOCK(cs_main);
-        if (pcoinsTip != NULL) {
+        if (pcoinsTip != nullptr) {
             FlushStateToDisk();
         }
         delete pcoinsTip;
-        pcoinsTip = NULL;
+        pcoinsTip = nullptr;
         delete pcoinscatcher;
-        pcoinscatcher = NULL;
+        pcoinscatcher = nullptr;
         delete pcoinsdbview;
-        pcoinsdbview = NULL;
+        pcoinsdbview = nullptr;
         delete pblocktree;
-        pblocktree = NULL;
+        pblocktree = nullptr;
     }
 #ifdef ENABLE_WALLET
-    for (CWalletRef pwallet : vpwallets) {
-        pwallet->Flush(true);
-    }
+    StopWallets();
 #endif
 
 #if ENABLE_ZMQ
     if (pzmqNotificationInterface) {
         UnregisterValidationInterface(pzmqNotificationInterface);
         delete pzmqNotificationInterface;
-        pzmqNotificationInterface = NULL;
+        pzmqNotificationInterface = nullptr;
     }
 #endif
 
@@ -268,10 +266,7 @@ void Shutdown()
     UnregisterAllValidationInterfaces();
     GetMainSignals().UnregisterBackgroundSignalScheduler();
 #ifdef ENABLE_WALLET
-    for (CWalletRef pwallet : vpwallets) {
-        delete pwallet;
-    }
-    vpwallets.clear();
+    CloseWallets();
 #endif
     globalVerifyHandle.reset();
     ECC_Stop();
@@ -300,7 +295,7 @@ static void registerSignalHandler(int signal, void(*handler)(int))
     sa.sa_handler = handler;
     sigemptyset(&sa.sa_mask);
     sa.sa_flags = 0;
-    sigaction(signal, &sa, NULL);
+    sigaction(signal, &sa, nullptr);
 }
 #endif
 
@@ -317,22 +312,13 @@ void OnRPCStopped()
     LogPrint(BCLog::RPC, "RPC stopped.\n");
 }
 
-void OnRPCPreCommand(const CRPCCommand& cmd)
-{
-    // Observe safe mode
-    std::string strWarning = GetWarnings("rpc");
-    if (strWarning != "" && !GetBoolArg("-disablesafemode", DEFAULT_DISABLE_SAFEMODE) &&
-        !cmd.okSafeMode)
-        throw JSONRPCError(RPC_FORBIDDEN_BY_SAFE_MODE, std::string("Safe mode: ") + strWarning);
-}
-
 std::string HelpMessage(HelpMessageMode mode)
 {
     const auto defaultBaseParams = CreateBaseChainParams(CBaseChainParams::MAIN);
     const auto testnetBaseParams = CreateBaseChainParams(CBaseChainParams::TESTNET);
     const auto defaultChainParams = CreateChainParams(CBaseChainParams::MAIN);
     const auto testnetChainParams = CreateChainParams(CBaseChainParams::TESTNET);
-    const bool showDebug = GetBoolArg("-help-debug", false);
+    const bool showDebug = gArgs.GetBoolArg("-help-debug", false);
 
     // When adding new options to the categories, please keep and ensure alphabetical ordering.
     // Do not translate _(...) -help-debug options, Many technical terms, and only a very small audience, so is unnecessary stress to translators.
@@ -362,6 +348,9 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-maxorphantx=<n>", strprintf(_("Keep at most <n> unconnectable transactions in memory (default: %u)"), DEFAULT_MAX_ORPHAN_TRANSACTIONS));
     strUsage += HelpMessageOpt("-maxmempool=<n>", strprintf(_("Keep the transaction memory pool below <n> megabytes (default: %u)"), DEFAULT_MAX_MEMPOOL_SIZE));
     strUsage += HelpMessageOpt("-mempoolexpiry=<n>", strprintf(_("Do not keep transactions in the mempool longer than <n> hours (default: %u)"), DEFAULT_MEMPOOL_EXPIRY));
+    if (showDebug) {
+        strUsage += HelpMessageOpt("-minimumchainwork=<hex>", strprintf("Minimum work assumed to exist on a valid chain in hex (default: %s, testnet: %s)", defaultChainParams->GetConsensus().nMinimumChainWork.GetHex(), testnetChainParams->GetConsensus().nMinimumChainWork.GetHex()));
+    }
     strUsage += HelpMessageOpt("-persistmempool", strprintf(_("Whether to save the mempool on shutdown and load on restart (default: %u)"), DEFAULT_PERSIST_MEMPOOL));
     strUsage += HelpMessageOpt("-blockreconstructionextratxn=<n>", strprintf(_("Extra transactions to keep in memory for compact block reconstructions (default: %u)"), DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN));
     strUsage += HelpMessageOpt("-par=<n>", strprintf(_("Set the number of script verification threads (%u to %d, 0 = auto, <0 = leave that many cores free, default: %d)"),
@@ -380,11 +369,11 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-txindex", strprintf(_("Maintain a full transaction index, used by the getrawtransaction rpc call (default: %u)"), DEFAULT_TXINDEX));
 
     strUsage += HelpMessageGroup(_("Connection options:"));
-    strUsage += HelpMessageOpt("-addnode=<ip>", _("Add a node to connect to and attempt to keep the connection open"));
+    strUsage += HelpMessageOpt("-addnode=<ip>", _("Add a node to connect to and attempt to keep the connection open (see the `addnode` RPC command help for more info)"));
     strUsage += HelpMessageOpt("-banscore=<n>", strprintf(_("Threshold for disconnecting misbehaving peers (default: %u)"), DEFAULT_BANSCORE_THRESHOLD));
     strUsage += HelpMessageOpt("-bantime=<n>", strprintf(_("Number of seconds to keep misbehaving peers from reconnecting (default: %u)"), DEFAULT_MISBEHAVING_BANTIME));
     strUsage += HelpMessageOpt("-bind=<addr>", _("Bind to given address and always listen on it. Use [host]:port notation for IPv6"));
-    strUsage += HelpMessageOpt("-connect=<ip>", _("Connect only to the specified node(s); -connect=0 disables automatic connections"));
+    strUsage += HelpMessageOpt("-connect=<ip>", _("Connect only to the specified node(s); -connect=0 disables automatic connections (the rules for this peer are the same as for -addnode)"));
     strUsage += HelpMessageOpt("-discover", _("Discover own IP addresses (default: 1 when listening and no -externalip or -proxy)"));
     strUsage += HelpMessageOpt("-dns", _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + strprintf(_("(default: %u)"), DEFAULT_NAME_LOOKUP));
     strUsage += HelpMessageOpt("-dnsseed", _("Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect used)"));
@@ -420,7 +409,7 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-maxuploadtarget=<n>", strprintf(_("Tries to keep outbound traffic under the given target (in MiB per 24h), 0 = no limit (default: %d)"), DEFAULT_MAX_UPLOAD_TARGET));
 
 #ifdef ENABLE_WALLET
-    strUsage += CWallet::GetWalletHelpString(showDebug);
+    strUsage += GetWalletHelpString(showDebug);
 #endif
 
 #if ENABLE_ZMQ
@@ -441,6 +430,7 @@ std::string HelpMessage(HelpMessageMode mode)
         strUsage += HelpMessageOpt("-checkmempool=<n>", strprintf("Run checks every <n> transactions (default: %u)", defaultChainParams->DefaultConsistencyChecks()));
         strUsage += HelpMessageOpt("-checkpoints", strprintf("Disable expensive verification for known chain history (default: %u)", DEFAULT_CHECKPOINTS_ENABLED));
         strUsage += HelpMessageOpt("-disablesafemode", strprintf("Disable safemode, override a real safe mode event (default: %u)", DEFAULT_DISABLE_SAFEMODE));
+        strUsage += HelpMessageOpt("-deprecatedrpc=<method>", "Allows deprecated RPC method(s) to be used");
         strUsage += HelpMessageOpt("-testsafemode", strprintf("Force safe mode (default: %u)", DEFAULT_TESTSAFEMODE));
         strUsage += HelpMessageOpt("-dropmessagestest=<n>", "Randomly drop 1 of every <n> network messages");
         strUsage += HelpMessageOpt("-fuzzmessagestest=<n>", "Randomly fuzz 1 of every <n> network messages");
@@ -479,7 +469,7 @@ std::string HelpMessage(HelpMessageMode mode)
 
     strUsage += HelpMessageGroup(_("Node relay options:"));
     if (showDebug) {
-        strUsage += HelpMessageOpt("-acceptnonstdtxn", strprintf("Relay and mine \"non-standard\" transactions (%sdefault: %u)", "testnet/regtest only; ", defaultChainParams->RequireStandard()));
+        strUsage += HelpMessageOpt("-acceptnonstdtxn", strprintf("Relay and mine \"non-standard\" transactions (%sdefault: %u)", "testnet/regtest only; ", !testnetChainParams->RequireStandard()));
         strUsage += HelpMessageOpt("-incrementalrelayfee=<amt>", strprintf("Fee rate (in %s/kB) used to define cost of relay, used for mempool limiting and BIP 125 replacement. (default: %s)", CURRENCY_UNIT, FormatMoney(DEFAULT_INCREMENTAL_RELAY_FEE)));
         strUsage += HelpMessageOpt("-dustrelayfee=<amt>", strprintf("Fee rate (in %s/kB) used to defined dust, the value of an output such that it will cost more than its value in fees at this fee rate to spend it. (default: %s)", CURRENCY_UNIT, FormatMoney(DUST_RELAY_TX_FEE)));
     }
@@ -494,7 +484,7 @@ std::string HelpMessage(HelpMessageMode mode)
 
     strUsage += HelpMessageGroup(_("Block creation options:"));
     strUsage += HelpMessageOpt("-blockmaxweight=<n>", strprintf(_("Set maximum BIP141 block weight (default: %d)"), DEFAULT_BLOCK_MAX_WEIGHT));
-    strUsage += HelpMessageOpt("-blockmaxsize=<n>", strprintf(_("Set maximum block size in bytes (default: %d)"), DEFAULT_BLOCK_MAX_SIZE));
+    strUsage += HelpMessageOpt("-blockmaxsize=<n>", _("Set maximum BIP141 block weight to this * 4. Deprecated, use blockmaxweight"));
     strUsage += HelpMessageOpt("-blockmintxfee=<amt>", strprintf(_("Set lowest fee rate (in %s/kB) for transactions to be included in block creation. (default: %s)"), CURRENCY_UNIT, FormatMoney(DEFAULT_BLOCK_MIN_TX_FEE)));
     if (showDebug)
         strUsage += HelpMessageOpt("-blockversion=<n>", "Override block version to test forking scenarios");
@@ -546,10 +536,11 @@ static void BlockNotifyCallback(bool initialSync, const CBlockIndex *pBlockIndex
     if (initialSync || !pBlockIndex)
         return;
 
-    std::string strCmd = GetArg("-blocknotify", "");
-
-    boost::replace_all(strCmd, "%s", pBlockIndex->GetBlockHash().GetHex());
-    boost::thread t(runCommand, strCmd); // thread runs free
+    std::string strCmd = gArgs.GetArg("-blocknotify", "");
+    if (!strCmd.empty()) {
+        boost::replace_all(strCmd, "%s", pBlockIndex->GetBlockHash().GetHex());
+        boost::thread t(runCommand, strCmd); // thread runs free
+    }
 }
 
 static bool fHaveGenesis = false;
@@ -558,7 +549,7 @@ static CConditionVariable condvar_GenesisWait;
 
 static void BlockNotifyGenesisWait(bool, const CBlockIndex *pBlockIndex)
 {
-    if (pBlockIndex != NULL) {
+    if (pBlockIndex != nullptr) {
         {
             boost::unique_lock<boost::mutex> lock_GenesisWait(cs_GenesisWait);
             fHaveGenesis = true;
@@ -597,7 +588,7 @@ void CleanupBlockRevFiles()
     LogPrintf("Removing unusable blk?????.dat and rev?????.dat files for -reindex with -prune\n");
     fs::path blocksdir = GetDataDir() / "blocks";
     for (fs::directory_iterator it(blocksdir); it != fs::directory_iterator(); it++) {
-        if (is_regular_file(*it) &&
+        if (fs::is_regular_file(*it) &&
             it->path().filename().string().length() == 12 &&
             it->path().filename().string().substr(8,4) == ".dat")
         {
@@ -683,12 +674,12 @@ void ThreadImport(std::vector<fs::path> vImportFiles)
         StartShutdown();
     }
 
-    if (GetBoolArg("-stopafterblockimport", DEFAULT_STOPAFTERBLOCKIMPORT)) {
+    if (gArgs.GetBoolArg("-stopafterblockimport", DEFAULT_STOPAFTERBLOCKIMPORT)) {
         LogPrintf("Stopping after block import\n");
         StartShutdown();
     }
     } // End scope of CImportingNow
-    if (GetArg("-persistmempool", DEFAULT_PERSIST_MEMPOOL)) {
+    if (gArgs.GetArg("-persistmempool", DEFAULT_PERSIST_MEMPOOL)) {
         LoadMempool();
         fDumpMempoolLater = !fRequestShutdown;
     }
@@ -720,14 +711,13 @@ bool AppInitServers(boost::thread_group& threadGroup)
 {
     RPCServer::OnStarted(&OnRPCStarted);
     RPCServer::OnStopped(&OnRPCStopped);
-    RPCServer::OnPreCommand(&OnRPCPreCommand);
     if (!InitHTTPServer())
         return false;
     if (!StartRPC())
         return false;
     if (!StartHTTPRPC())
         return false;
-    if (GetBoolArg("-rest", DEFAULT_REST_ENABLE) && !StartREST())
+    if (gArgs.GetBoolArg("-rest", DEFAULT_REST_ENABLE) && !StartREST())
         return false;
     if (!StartHTTPServer())
         return false;
@@ -739,63 +729,72 @@ void InitParameterInteraction()
 {
     // when specifying an explicit binding address, you want to listen on it
     // even when -connect or -proxy is specified
-    if (IsArgSet("-bind")) {
-        if (SoftSetBoolArg("-listen", true))
+    if (gArgs.IsArgSet("-bind")) {
+        if (gArgs.SoftSetBoolArg("-listen", true))
             LogPrintf("%s: parameter interaction: -bind set -> setting -listen=1\n", __func__);
     }
-    if (IsArgSet("-whitebind")) {
-        if (SoftSetBoolArg("-listen", true))
+    if (gArgs.IsArgSet("-whitebind")) {
+        if (gArgs.SoftSetBoolArg("-listen", true))
             LogPrintf("%s: parameter interaction: -whitebind set -> setting -listen=1\n", __func__);
     }
 
     if (gArgs.IsArgSet("-connect")) {
         // when only connecting to trusted nodes, do not seed via DNS, or listen by default
-        if (SoftSetBoolArg("-dnsseed", false))
+        if (gArgs.SoftSetBoolArg("-dnsseed", false))
             LogPrintf("%s: parameter interaction: -connect set -> setting -dnsseed=0\n", __func__);
-        if (SoftSetBoolArg("-listen", false))
+        if (gArgs.SoftSetBoolArg("-listen", false))
             LogPrintf("%s: parameter interaction: -connect set -> setting -listen=0\n", __func__);
     }
 
-    if (IsArgSet("-proxy")) {
+    if (gArgs.IsArgSet("-proxy")) {
         // to protect privacy, do not listen by default if a default proxy server is specified
-        if (SoftSetBoolArg("-listen", false))
+        if (gArgs.SoftSetBoolArg("-listen", false))
             LogPrintf("%s: parameter interaction: -proxy set -> setting -listen=0\n", __func__);
         // to protect privacy, do not use UPNP when a proxy is set. The user may still specify -listen=1
         // to listen locally, so don't rely on this happening through -listen below.
-        if (SoftSetBoolArg("-upnp", false))
+        if (gArgs.SoftSetBoolArg("-upnp", false))
             LogPrintf("%s: parameter interaction: -proxy set -> setting -upnp=0\n", __func__);
         // to protect privacy, do not discover addresses by default
-        if (SoftSetBoolArg("-discover", false))
+        if (gArgs.SoftSetBoolArg("-discover", false))
             LogPrintf("%s: parameter interaction: -proxy set -> setting -discover=0\n", __func__);
     }
 
-    if (!GetBoolArg("-listen", DEFAULT_LISTEN)) {
+    if (!gArgs.GetBoolArg("-listen", DEFAULT_LISTEN)) {
         // do not map ports or try to retrieve public IP when not listening (pointless)
-        if (SoftSetBoolArg("-upnp", false))
+        if (gArgs.SoftSetBoolArg("-upnp", false))
             LogPrintf("%s: parameter interaction: -listen=0 -> setting -upnp=0\n", __func__);
-        if (SoftSetBoolArg("-discover", false))
+        if (gArgs.SoftSetBoolArg("-discover", false))
             LogPrintf("%s: parameter interaction: -listen=0 -> setting -discover=0\n", __func__);
-        if (SoftSetBoolArg("-listenonion", false))
+        if (gArgs.SoftSetBoolArg("-listenonion", false))
             LogPrintf("%s: parameter interaction: -listen=0 -> setting -listenonion=0\n", __func__);
     }
 
-    if (IsArgSet("-externalip")) {
+    if (gArgs.IsArgSet("-externalip")) {
         // if an explicit public IP is specified, do not try to find others
-        if (SoftSetBoolArg("-discover", false))
+        if (gArgs.SoftSetBoolArg("-discover", false))
             LogPrintf("%s: parameter interaction: -externalip set -> setting -discover=0\n", __func__);
     }
 
     // disable whitelistrelay in blocksonly mode
-    if (GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY)) {
-        if (SoftSetBoolArg("-whitelistrelay", false))
+    if (gArgs.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY)) {
+        if (gArgs.SoftSetBoolArg("-whitelistrelay", false))
             LogPrintf("%s: parameter interaction: -blocksonly=1 -> setting -whitelistrelay=0\n", __func__);
     }
 
     // Forcing relay from whitelisted hosts implies we will accept relays from them in the first place.
-    if (GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) {
-        if (SoftSetBoolArg("-whitelistrelay", true))
+    if (gArgs.GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) {
+        if (gArgs.SoftSetBoolArg("-whitelistrelay", true))
             LogPrintf("%s: parameter interaction: -whitelistforcerelay=1 -> setting -whitelistrelay=1\n", __func__);
     }
+
+    if (gArgs.IsArgSet("-blockmaxsize")) {
+        unsigned int max_size = gArgs.GetArg("-blockmaxsize", 0);
+        if (gArgs.SoftSetArg("blockmaxweight", strprintf("%d", max_size * WITNESS_SCALE_FACTOR))) {
+            LogPrintf("%s: parameter interaction: -blockmaxsize=%d -> setting -blockmaxweight=%d (-blockmaxsize is deprecated!)\n", __func__, max_size, max_size * WITNESS_SCALE_FACTOR);
+        } else {
+            LogPrintf("%s: Ignoring blockmaxsize setting which is overridden by blockmaxweight", __func__);
+        }
+    }
 }
 
 static std::string ResolveErrMsg(const char * const optname, const std::string& strBind)
@@ -805,10 +804,10 @@ static std::string ResolveErrMsg(const char * const optname, const std::string&
 
 void InitLogging()
 {
-    fPrintToConsole = GetBoolArg("-printtoconsole", false);
-    fLogTimestamps = GetBoolArg("-logtimestamps", DEFAULT_LOGTIMESTAMPS);
-    fLogTimeMicros = GetBoolArg("-logtimemicros", DEFAULT_LOGTIMEMICROS);
-    fLogIPs = GetBoolArg("-logips", DEFAULT_LOGIPS);
+    fPrintToConsole = gArgs.GetBoolArg("-printtoconsole", false);
+    fLogTimestamps = gArgs.GetBoolArg("-logtimestamps", DEFAULT_LOGTIMESTAMPS);
+    fLogTimeMicros = gArgs.GetBoolArg("-logtimemicros", DEFAULT_LOGTIMEMICROS);
+    fLogIPs = gArgs.GetBoolArg("-logips", DEFAULT_LOGIPS);
 
     LogPrintf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
     LogPrintf("Bitcoin version %s\n", FormatFullVersion());
@@ -816,7 +815,6 @@ void InitLogging()
 
 namespace { // Variables internal to initialization process only
 
-ServiceFlags nRelevantServices = NODE_NETWORK;
 int nMaxConnections;
 int nUserMaxConnections;
 int nFD;
@@ -843,7 +841,7 @@ bool AppInitBasicSetup()
 #ifdef _MSC_VER
     // Turn off Microsoft heap dump noise
     _CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE);
-    _CrtSetReportFile(_CRT_WARN, CreateFileA("NUL", GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0));
+    _CrtSetReportFile(_CRT_WARN, CreateFileA("NUL", GENERIC_WRITE, 0, nullptr, OPEN_EXISTING, 0, 0));
     // Disable confusing "helpful" text message on abort, Ctrl-C
     _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
 #endif
@@ -858,14 +856,14 @@ bool AppInitBasicSetup()
 #endif
     typedef BOOL (WINAPI *PSETPROCDEPPOL)(DWORD);
     PSETPROCDEPPOL setProcDEPPol = (PSETPROCDEPPOL)GetProcAddress(GetModuleHandleA("Kernel32.dll"), "SetProcessDEPPolicy");
-    if (setProcDEPPol != NULL) setProcDEPPol(PROCESS_DEP_ENABLE);
+    if (setProcDEPPol != nullptr) setProcDEPPol(PROCESS_DEP_ENABLE);
 #endif
 
     if (!SetupNetworking())
         return InitError("Initializing networking failed");
 
 #ifndef WIN32
-    if (!GetBoolArg("-sysperms", false)) {
+    if (!gArgs.GetBoolArg("-sysperms", false)) {
         umask(077);
     }
 
@@ -893,8 +891,8 @@ bool AppInitParameterInteraction()
     // also see: InitParameterInteraction()
 
     // if using block pruning, then disallow txindex
-    if (GetArg("-prune", 0)) {
-        if (GetBoolArg("-txindex", DEFAULT_TXINDEX))
+    if (gArgs.GetArg("-prune", 0)) {
+        if (gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX))
             return InitError(_("Prune mode is incompatible with -txindex."));
     }
 
@@ -906,7 +904,7 @@ bool AppInitParameterInteraction()
 
     // Make sure enough file descriptors are available
     int nBind = std::max(nUserBind, size_t(1));
-    nUserMaxConnections = GetArg("-maxconnections", DEFAULT_MAX_PEER_CONNECTIONS);
+    nUserMaxConnections = gArgs.GetArg("-maxconnections", DEFAULT_MAX_PEER_CONNECTIONS);
     nMaxConnections = std::max(nUserMaxConnections, 0);
 
     // Trim requested connection counts, to fit into system limitations
@@ -947,55 +945,69 @@ bool AppInitParameterInteraction()
     }
 
     // Check for -debugnet
-    if (GetBoolArg("-debugnet", false))
+    if (gArgs.GetBoolArg("-debugnet", false))
         InitWarning(_("Unsupported argument -debugnet ignored, use -debug=net."));
     // Check for -socks - as this is a privacy risk to continue, exit here
-    if (IsArgSet("-socks"))
+    if (gArgs.IsArgSet("-socks"))
         return InitError(_("Unsupported argument -socks found. Setting SOCKS version isn't possible anymore, only SOCKS5 proxies are supported."));
     // Check for -tor - as this is a privacy risk to continue, exit here
-    if (GetBoolArg("-tor", false))
+    if (gArgs.GetBoolArg("-tor", false))
         return InitError(_("Unsupported argument -tor found, use -onion."));
 
-    if (GetBoolArg("-benchmark", false))
+    if (gArgs.GetBoolArg("-benchmark", false))
         InitWarning(_("Unsupported argument -benchmark ignored, use -debug=bench."));
 
-    if (GetBoolArg("-whitelistalwaysrelay", false))
+    if (gArgs.GetBoolArg("-whitelistalwaysrelay", false))
         InitWarning(_("Unsupported argument -whitelistalwaysrelay ignored, use -whitelistrelay and/or -whitelistforcerelay."));
 
-    if (IsArgSet("-blockminsize"))
+    if (gArgs.IsArgSet("-blockminsize"))
         InitWarning("Unsupported argument -blockminsize ignored.");
 
     // Checkmempool and checkblockindex default to true in regtest mode
-    int ratio = std::min<int>(std::max<int>(GetArg("-checkmempool", chainparams.DefaultConsistencyChecks() ? 1 : 0), 0), 1000000);
+    int ratio = std::min<int>(std::max<int>(gArgs.GetArg("-checkmempool", chainparams.DefaultConsistencyChecks() ? 1 : 0), 0), 1000000);
     if (ratio != 0) {
         mempool.setSanityCheck(1.0 / ratio);
     }
-    fCheckBlockIndex = GetBoolArg("-checkblockindex", chainparams.DefaultConsistencyChecks());
-    fCheckpointsEnabled = GetBoolArg("-checkpoints", DEFAULT_CHECKPOINTS_ENABLED);
+    fCheckBlockIndex = gArgs.GetBoolArg("-checkblockindex", chainparams.DefaultConsistencyChecks());
+    fCheckpointsEnabled = gArgs.GetBoolArg("-checkpoints", DEFAULT_CHECKPOINTS_ENABLED);
 
-    hashAssumeValid = uint256S(GetArg("-assumevalid", chainparams.GetConsensus().defaultAssumeValid.GetHex()));
+    hashAssumeValid = uint256S(gArgs.GetArg("-assumevalid", chainparams.GetConsensus().defaultAssumeValid.GetHex()));
     if (!hashAssumeValid.IsNull())
         LogPrintf("Assuming ancestors of block %s have valid signatures.\n", hashAssumeValid.GetHex());
     else
         LogPrintf("Validating signatures for all blocks.\n");
 
+    if (gArgs.IsArgSet("-minimumchainwork")) {
+        const std::string minChainWorkStr = gArgs.GetArg("-minimumchainwork", "");
+        if (!IsHexNumber(minChainWorkStr)) {
+            return InitError(strprintf("Invalid non-hex (%s) minimum chain work value specified", minChainWorkStr));
+        }
+        nMinimumChainWork = UintToArith256(uint256S(minChainWorkStr));
+    } else {
+        nMinimumChainWork = UintToArith256(chainparams.GetConsensus().nMinimumChainWork);
+    }
+    LogPrintf("Setting nMinimumChainWork=%s\n", nMinimumChainWork.GetHex());
+    if (nMinimumChainWork < UintToArith256(chainparams.GetConsensus().nMinimumChainWork)) {
+        LogPrintf("Warning: nMinimumChainWork set below default value of %s\n", chainparams.GetConsensus().nMinimumChainWork.GetHex());
+    }
+
     // mempool limits
-    int64_t nMempoolSizeMax = GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
-    int64_t nMempoolSizeMin = GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT) * 1000 * 40;
+    int64_t nMempoolSizeMax = gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
+    int64_t nMempoolSizeMin = gArgs.GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT) * 1000 * 40;
     if (nMempoolSizeMax < 0 || nMempoolSizeMax < nMempoolSizeMin)
         return InitError(strprintf(_("-maxmempool must be at least %d MB"), std::ceil(nMempoolSizeMin / 1000000.0)));
     // incremental relay fee sets the minimum feerate increase necessary for BIP 125 replacement in the mempool
     // and the amount the mempool min fee increases above the feerate of txs evicted due to mempool limiting.
-    if (IsArgSet("-incrementalrelayfee"))
+    if (gArgs.IsArgSet("-incrementalrelayfee"))
     {
         CAmount n = 0;
-        if (!ParseMoney(GetArg("-incrementalrelayfee", ""), n))
-            return InitError(AmountErrMsg("incrementalrelayfee", GetArg("-incrementalrelayfee", "")));
+        if (!ParseMoney(gArgs.GetArg("-incrementalrelayfee", ""), n))
+            return InitError(AmountErrMsg("incrementalrelayfee", gArgs.GetArg("-incrementalrelayfee", "")));
         incrementalRelayFee = CFeeRate(n);
     }
 
     // -par=0 means autodetect, but nScriptCheckThreads==0 means no concurrency
-    nScriptCheckThreads = GetArg("-par", DEFAULT_SCRIPTCHECK_THREADS);
+    nScriptCheckThreads = gArgs.GetArg("-par", DEFAULT_SCRIPTCHECK_THREADS);
     if (nScriptCheckThreads <= 0)
         nScriptCheckThreads += GetNumCores();
     if (nScriptCheckThreads <= 1)
@@ -1004,7 +1016,7 @@ bool AppInitParameterInteraction()
         nScriptCheckThreads = MAX_SCRIPTCHECK_THREADS;
 
     // block pruning; get the amount of disk space (in MiB) to allot for block & undo files
-    int64_t nPruneArg = GetArg("-prune", 0);
+    int64_t nPruneArg = gArgs.GetArg("-prune", 0);
     if (nPruneArg < 0) {
         return InitError(_("Prune cannot be configured with a negative value."));
     }
@@ -1023,19 +1035,19 @@ bool AppInitParameterInteraction()
 
     RegisterAllCoreRPCCommands(tableRPC);
 #ifdef ENABLE_WALLET
-    RegisterWalletRPCCommands(tableRPC);
+    RegisterWalletRPC(tableRPC);
 #endif
 
-    nConnectTimeout = GetArg("-timeout", DEFAULT_CONNECT_TIMEOUT);
+    nConnectTimeout = gArgs.GetArg("-timeout", DEFAULT_CONNECT_TIMEOUT);
     if (nConnectTimeout <= 0)
         nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
 
-    if (IsArgSet("-minrelaytxfee")) {
+    if (gArgs.IsArgSet("-minrelaytxfee")) {
         CAmount n = 0;
-        if (!ParseMoney(GetArg("-minrelaytxfee", ""), n)) {
-            return InitError(AmountErrMsg("minrelaytxfee", GetArg("-minrelaytxfee", "")));
+        if (!ParseMoney(gArgs.GetArg("-minrelaytxfee", ""), n)) {
+            return InitError(AmountErrMsg("minrelaytxfee", gArgs.GetArg("-minrelaytxfee", "")));
         }
-        // High fee check is done afterward in CWallet::ParameterInteraction()
+        // High fee check is done afterward in WalletParameterInteraction()
         ::minRelayTxFee = CFeeRate(n);
     } else if (incrementalRelayFee > ::minRelayTxFee) {
         // Allow only setting incrementalRelayFee to control both
@@ -1045,55 +1057,55 @@ bool AppInitParameterInteraction()
 
     // Sanity check argument for min fee for including tx in block
     // TODO: Harmonize which arguments need sanity checking and where that happens
-    if (IsArgSet("-blockmintxfee"))
+    if (gArgs.IsArgSet("-blockmintxfee"))
     {
         CAmount n = 0;
-        if (!ParseMoney(GetArg("-blockmintxfee", ""), n))
-            return InitError(AmountErrMsg("blockmintxfee", GetArg("-blockmintxfee", "")));
+        if (!ParseMoney(gArgs.GetArg("-blockmintxfee", ""), n))
+            return InitError(AmountErrMsg("blockmintxfee", gArgs.GetArg("-blockmintxfee", "")));
     }
 
     // Feerate used to define dust.  Shouldn't be changed lightly as old
     // implementations may inadvertently create non-standard transactions
-    if (IsArgSet("-dustrelayfee"))
+    if (gArgs.IsArgSet("-dustrelayfee"))
     {
         CAmount n = 0;
-        if (!ParseMoney(GetArg("-dustrelayfee", ""), n) || 0 == n)
-            return InitError(AmountErrMsg("dustrelayfee", GetArg("-dustrelayfee", "")));
+        if (!ParseMoney(gArgs.GetArg("-dustrelayfee", ""), n) || 0 == n)
+            return InitError(AmountErrMsg("dustrelayfee", gArgs.GetArg("-dustrelayfee", "")));
         dustRelayFee = CFeeRate(n);
     }
 
-    fRequireStandard = !GetBoolArg("-acceptnonstdtxn", !chainparams.RequireStandard());
+    fRequireStandard = !gArgs.GetBoolArg("-acceptnonstdtxn", !chainparams.RequireStandard());
     if (chainparams.RequireStandard() && !fRequireStandard)
         return InitError(strprintf("acceptnonstdtxn is not currently supported for %s chain", chainparams.NetworkIDString()));
-    nBytesPerSigOp = GetArg("-bytespersigop", nBytesPerSigOp);
+    nBytesPerSigOp = gArgs.GetArg("-bytespersigop", nBytesPerSigOp);
 
 #ifdef ENABLE_WALLET
-    if (!CWallet::ParameterInteraction())
+    if (!WalletParameterInteraction())
         return false;
 #endif
 
-    fIsBareMultisigStd = GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
-    fAcceptDatacarrier = GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
-    nMaxDatacarrierBytes = GetArg("-datacarriersize", nMaxDatacarrierBytes);
+    fIsBareMultisigStd = gArgs.GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
+    fAcceptDatacarrier = gArgs.GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
+    nMaxDatacarrierBytes = gArgs.GetArg("-datacarriersize", nMaxDatacarrierBytes);
 
     // Option to startup with mocktime set (used for regression testing):
-    SetMockTime(GetArg("-mocktime", 0)); // SetMockTime(0) is a no-op
+    SetMockTime(gArgs.GetArg("-mocktime", 0)); // SetMockTime(0) is a no-op
 
-    if (GetBoolArg("-peerbloomfilters", DEFAULT_PEERBLOOMFILTERS))
+    if (gArgs.GetBoolArg("-peerbloomfilters", DEFAULT_PEERBLOOMFILTERS))
         nLocalServices = ServiceFlags(nLocalServices | NODE_BLOOM);
 
-    if (GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) < 0)
+    if (gArgs.GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) < 0)
         return InitError("rpcserialversion must be non-negative.");
 
-    if (GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) > 1)
+    if (gArgs.GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) > 1)
         return InitError("unknown rpcserialversion requested.");
 
-    nMaxTipAge = GetArg("-maxtipage", DEFAULT_MAX_TIP_AGE);
+    nMaxTipAge = gArgs.GetArg("-maxtipage", DEFAULT_MAX_TIP_AGE);
 
-    fEnableReplacement = GetBoolArg("-mempoolreplacement", DEFAULT_ENABLE_REPLACEMENT);
-    if ((!fEnableReplacement) && IsArgSet("-mempoolreplacement")) {
+    fEnableReplacement = gArgs.GetBoolArg("-mempoolreplacement", DEFAULT_ENABLE_REPLACEMENT);
+    if ((!fEnableReplacement) && gArgs.IsArgSet("-mempoolreplacement")) {
         // Minimal effort at forwards compatibility
-        std::string strReplacementModeList = GetArg("-mempoolreplacement", "");  // default is impossible
+        std::string strReplacementModeList = gArgs.GetArg("-mempoolreplacement", "");  // default is impossible
         std::vector<std::string> vstrReplacementModes;
         boost::split(vstrReplacementModes, strReplacementModeList, boost::is_any_of(","));
         fEnableReplacement = (std::find(vstrReplacementModes.begin(), vstrReplacementModes.end(), "fee") != vstrReplacementModes.end());
@@ -1198,7 +1210,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
 #ifndef WIN32
     CreatePidFile(GetPidFile(), getpid());
 #endif
-    if (GetBoolArg("-shrinkdebugfile", logCategories == BCLog::NONE)) {
+    if (gArgs.GetBoolArg("-shrinkdebugfile", logCategories == BCLog::NONE)) {
         // Do this first since it both loads a bunch of debug.log into memory,
         // and because this needs to happen before any other debug.log printing
         ShrinkDebugFile();
@@ -1211,7 +1223,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
         LogPrintf("Startup time: %s\n", DateTimeStrFormat("%Y-%m-%d %H:%M:%S", GetTime()));
     LogPrintf("Default data directory %s\n", GetDefaultDataDir().string());
     LogPrintf("Using data directory %s\n", GetDataDir().string());
-    LogPrintf("Using config file %s\n", GetConfigFile(GetArg("-conf", BITCOIN_CONF_FILENAME)).string());
+    LogPrintf("Using config file %s\n", GetConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME)).string());
     LogPrintf("Using at most %i automatic connections (%i file descriptors available)\n", nMaxConnections, nFD);
 
     InitSignatureCache();
@@ -1234,7 +1246,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
      * that the server is there and will be ready later).  Warmup mode will
      * be disabled when initialisation is finished.
      */
-    if (GetBoolArg("-server", false))
+    if (gArgs.GetBoolArg("-server", false))
     {
         uiInterface.InitMessage.connect(SetRPCWarmupStatus);
         if (!AppInitServers(threadGroup))
@@ -1245,7 +1257,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
 
     // ********************************************************* Step 5: verify wallet database integrity
 #ifdef ENABLE_WALLET
-    if (!CWallet::Verify())
+    if (!VerifyWallets())
         return false;
 #endif
     // ********************************************************* Step 6: network initialization
@@ -1260,7 +1272,6 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
 
     peerLogic.reset(new PeerLogicValidation(&connman));
     RegisterValidationInterface(peerLogic.get());
-    RegisterNodeSignals(GetNodeSignals());
 
     // sanitize comments per BIP-0014, format user agent and check total size
     std::vector<std::string> uacomments;
@@ -1291,12 +1302,12 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
     }
 
     // Check for host lookup allowed before parsing any network related parameters
-    fNameLookup = GetBoolArg("-dns", DEFAULT_NAME_LOOKUP);
+    fNameLookup = gArgs.GetBoolArg("-dns", DEFAULT_NAME_LOOKUP);
 
-    bool proxyRandomize = GetBoolArg("-proxyrandomize", DEFAULT_PROXYRANDOMIZE);
+    bool proxyRandomize = gArgs.GetBoolArg("-proxyrandomize", DEFAULT_PROXYRANDOMIZE);
     // -proxy sets a proxy for all outgoing network traffic
     // -noproxy (or -proxy=0) as well as the empty string can be used to not set a proxy, this is the default
-    std::string proxyArg = GetArg("-proxy", "");
+    std::string proxyArg = gArgs.GetArg("-proxy", "");
     SetLimited(NET_TOR);
     if (proxyArg != "" && proxyArg != "0") {
         CService proxyAddr;
@@ -1318,7 +1329,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
     // -onion can be used to set only a proxy for .onion, or override normal proxy for .onion addresses
     // -noonion (or -onion=0) disables connecting to .onion entirely
     // An empty string is used to not override the onion proxy (in which case it defaults to -proxy set above, or none)
-    std::string onionArg = GetArg("-onion", "");
+    std::string onionArg = gArgs.GetArg("-onion", "");
     if (onionArg != "") {
         if (onionArg == "0") { // Handle -noonion/-onion=0
             SetLimited(NET_TOR); // set onions as unreachable
@@ -1336,9 +1347,9 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
     }
 
     // see Step 2: parameter interactions for more information about these
-    fListen = GetBoolArg("-listen", DEFAULT_LISTEN);
-    fDiscover = GetBoolArg("-discover", true);
-    fRelayTxes = !GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY);
+    fListen = gArgs.GetBoolArg("-listen", DEFAULT_LISTEN);
+    fDiscover = gArgs.GetBoolArg("-discover", true);
+    fRelayTxes = !gArgs.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY);
 
     for (const std::string& strAddr : gArgs.GetArgs("-externalip")) {
         CService addrLocal;
@@ -1358,27 +1369,27 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
     uint64_t nMaxOutboundLimit = 0; //unlimited unless -maxuploadtarget is set
     uint64_t nMaxOutboundTimeframe = MAX_UPLOAD_TIMEFRAME;
 
-    if (IsArgSet("-maxuploadtarget")) {
-        nMaxOutboundLimit = GetArg("-maxuploadtarget", DEFAULT_MAX_UPLOAD_TARGET)*1024*1024;
+    if (gArgs.IsArgSet("-maxuploadtarget")) {
+        nMaxOutboundLimit = gArgs.GetArg("-maxuploadtarget", DEFAULT_MAX_UPLOAD_TARGET)*1024*1024;
     }
 
     // ********************************************************* Step 7: load block chain
 
-    fReindex = GetBoolArg("-reindex", false);
-    bool fReindexChainState = GetBoolArg("-reindex-chainstate", false);
+    fReindex = gArgs.GetBoolArg("-reindex", false);
+    bool fReindexChainState = gArgs.GetBoolArg("-reindex-chainstate", false);
 
     // cache size calculations
-    int64_t nTotalCache = (GetArg("-dbcache", nDefaultDbCache) << 20);
+    int64_t nTotalCache = (gArgs.GetArg("-dbcache", nDefaultDbCache) << 20);
     nTotalCache = std::max(nTotalCache, nMinDbCache << 20); // total cache cannot be less than nMinDbCache
     nTotalCache = std::min(nTotalCache, nMaxDbCache << 20); // total cache cannot be greater than nMaxDbcache
     int64_t nBlockTreeDBCache = nTotalCache / 8;
-    nBlockTreeDBCache = std::min(nBlockTreeDBCache, (GetBoolArg("-txindex", DEFAULT_TXINDEX) ? nMaxBlockDBAndTxIndexCache : nMaxBlockDBCache) << 20);
+    nBlockTreeDBCache = std::min(nBlockTreeDBCache, (gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX) ? nMaxBlockDBAndTxIndexCache : nMaxBlockDBCache) << 20);
     nTotalCache -= nBlockTreeDBCache;
     int64_t nCoinDBCache = std::min(nTotalCache / 2, (nTotalCache / 4) + (1 << 23)); // use 25%-50% of the remainder for disk cache
     nCoinDBCache = std::min(nCoinDBCache, nMaxCoinsDBCache << 20); // cap total coins db cache
     nTotalCache -= nCoinDBCache;
     nCoinCacheUsage = nTotalCache; // the rest goes to in-memory cache
-    int64_t nMempoolSizeMax = GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
+    int64_t nMempoolSizeMax = gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
     LogPrintf("Cache configuration:\n");
     LogPrintf("* Using %.1fMiB for block index database\n", nBlockTreeDBCache * (1.0 / 1024 / 1024));
     LogPrintf("* Using %.1fMiB for chain state database\n", nCoinDBCache * (1.0 / 1024 / 1024));
@@ -1427,8 +1438,8 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
                     return InitError(_("Incorrect or no genesis block found. Wrong datadir for network?"));
 
                 // Check for changed -txindex state
-                if (fTxIndex != GetBoolArg("-txindex", DEFAULT_TXINDEX)) {
-                    strLoadError = _("You need to rebuild the database using -reindex-chainstate to change -txindex");
+                if (fTxIndex != gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX)) {
+                    strLoadError = _("You need to rebuild the database using -reindex to change -txindex");
                     break;
                 }
 
@@ -1477,7 +1488,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
                         strLoadError = _("Error initializing block database");
                         break;
                     }
-                    assert(chainActive.Tip() != NULL);
+                    assert(chainActive.Tip() != nullptr);
                 }
 
                 if (!fReset) {
@@ -1493,7 +1504,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
 
                 if (!is_coinsview_empty) {
                     uiInterface.InitMessage(_("Verifying blocks..."));
-                    if (fHavePruned && GetArg("-checkblocks", DEFAULT_CHECKBLOCKS) > MIN_BLOCKS_TO_KEEP) {
+                    if (fHavePruned && gArgs.GetArg("-checkblocks", DEFAULT_CHECKBLOCKS) > MIN_BLOCKS_TO_KEEP) {
                         LogPrintf("Prune: pruned datadir may not have more than %d blocks; only checking available blocks",
                             MIN_BLOCKS_TO_KEEP);
                     }
@@ -1510,8 +1521,8 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
                         }
                     }
 
-                    if (!CVerifyDB().VerifyDB(chainparams, pcoinsdbview, GetArg("-checklevel", DEFAULT_CHECKLEVEL),
-                                  GetArg("-checkblocks", DEFAULT_CHECKBLOCKS))) {
+                    if (!CVerifyDB().VerifyDB(chainparams, pcoinsdbview, gArgs.GetArg("-checklevel", DEFAULT_CHECKLEVEL),
+                                  gArgs.GetArg("-checkblocks", DEFAULT_CHECKBLOCKS))) {
                         strLoadError = _("Corrupted block database detected");
                         break;
                     }
@@ -1566,7 +1577,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
 
     // ********************************************************* Step 8: load wallet
 #ifdef ENABLE_WALLET
-    if (!CWallet::InitLoadWallet())
+    if (!OpenWallets())
         return false;
 #else
     LogPrintf("No wallet support compiled in!\n");
@@ -1593,9 +1604,6 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
         // Note that setting NODE_WITNESS is never required: the only downside from not
         // doing so is that after activation, no upgraded nodes will fetch from you.
         nLocalServices = ServiceFlags(nLocalServices | NODE_WITNESS);
-        // Only care about others providing witness capabilities if there is a softfork
-        // defined.
-        nRelevantServices = ServiceFlags(nRelevantServices | NODE_WITNESS);
     }
 
     // ********************************************************* Step 10: import blocks
@@ -1605,13 +1613,13 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
 
     // Either install a handler to notify us when genesis activates, or set fHaveGenesis directly.
     // No locking, as this happens before any background thread is started.
-    if (chainActive.Tip() == NULL) {
+    if (chainActive.Tip() == nullptr) {
         uiInterface.NotifyBlockTip.connect(BlockNotifyGenesisWait);
     } else {
         fHaveGenesis = true;
     }
 
-    if (IsArgSet("-blocknotify"))
+    if (gArgs.IsArgSet("-blocknotify"))
         uiInterface.NotifyBlockTip.connect(BlockNotifyCallback);
 
     std::vector<fs::path> vImportFiles;
@@ -1632,28 +1640,36 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
 
     // ********************************************************* Step 11: start node
 
+    int chain_active_height;
+
     //// debug print
-    LogPrintf("mapBlockIndex.size() = %u\n",   mapBlockIndex.size());
-    LogPrintf("nBestHeight = %d\n",                   chainActive.Height());
-    if (GetBoolArg("-listenonion", DEFAULT_LISTEN_ONION))
+    {
+        LOCK(cs_main);
+        LogPrintf("mapBlockIndex.size() = %u\n", mapBlockIndex.size());
+        chain_active_height = chainActive.Height();
+    }
+    LogPrintf("nBestHeight = %d\n", chain_active_height);
+
+    if (gArgs.GetBoolArg("-listenonion", DEFAULT_LISTEN_ONION))
         StartTorControl(threadGroup, scheduler);
 
     Discover(threadGroup);
 
     // Map ports with UPnP
-    MapPort(GetBoolArg("-upnp", DEFAULT_UPNP));
+    MapPort(gArgs.GetBoolArg("-upnp", DEFAULT_UPNP));
 
     CConnman::Options connOptions;
     connOptions.nLocalServices = nLocalServices;
-    connOptions.nRelevantServices = nRelevantServices;
     connOptions.nMaxConnections = nMaxConnections;
     connOptions.nMaxOutbound = std::min(MAX_OUTBOUND_CONNECTIONS, connOptions.nMaxConnections);
     connOptions.nMaxAddnode = MAX_ADDNODE_CONNECTIONS;
     connOptions.nMaxFeeler = 1;
-    connOptions.nBestHeight = chainActive.Height();
+    connOptions.nBestHeight = chain_active_height;
     connOptions.uiInterface = &uiInterface;
-    connOptions.nSendBufferMaxSize = 1000*GetArg("-maxsendbuffer", DEFAULT_MAXSENDBUFFER);
-    connOptions.nReceiveFloodSize = 1000*GetArg("-maxreceivebuffer", DEFAULT_MAXRECEIVEBUFFER);
+    connOptions.m_msgproc = peerLogic.get();
+    connOptions.nSendBufferMaxSize = 1000*gArgs.GetArg("-maxsendbuffer", DEFAULT_MAXSENDBUFFER);
+    connOptions.nReceiveFloodSize = 1000*gArgs.GetArg("-maxreceivebuffer", DEFAULT_MAXRECEIVEBUFFER);
+    connOptions.m_added_nodes = gArgs.GetArgs("-addnode");
 
     connOptions.nMaxOutboundTimeframe = nMaxOutboundTimeframe;
     connOptions.nMaxOutboundLimit = nMaxOutboundLimit;
@@ -1684,10 +1700,16 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
         connOptions.vWhitelistedRange.push_back(subnet);
     }
 
-    if (gArgs.IsArgSet("-seednode")) {
-        connOptions.vSeedNodes = gArgs.GetArgs("-seednode");
-    }
+    connOptions.vSeedNodes = gArgs.GetArgs("-seednode");
 
+    // Initiate outbound connections unless connect=0
+    connOptions.m_use_addrman_outgoing = !gArgs.IsArgSet("-connect");
+    if (!connOptions.m_use_addrman_outgoing) {
+        const auto connect = gArgs.GetArgs("-connect");
+        if (connect.size() != 1 || connect[0] != "0") {
+            connOptions.m_specified_outgoing = connect;
+        }
+    }
     if (!connman.Start(scheduler, connOptions)) {
         return false;
     }
@@ -1698,9 +1720,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
     uiInterface.InitMessage(_("Done loading"));
 
 #ifdef ENABLE_WALLET
-    for (CWalletRef pwallet : vpwallets) {
-        pwallet->postInitProcess(scheduler);
-    }
+    StartWallets(scheduler);
 #endif
 
     return !fRequestShutdown;
diff --git a/src/key.cpp b/src/key.cpp
index 5a991fc1d..315a3978c 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -13,7 +13,7 @@
 #include <secp256k1.h>
 #include <secp256k1_recovery.h>
 
-static secp256k1_context* secp256k1_context_sign = NULL;
+static secp256k1_context* secp256k1_context_sign = nullptr;
 
 /** These functions are taken from the libsecp256k1 distribution and are very ugly. */
 static int ec_privkey_import_der(const secp256k1_context* ctx, unsigned char *out32, const unsigned char *privkey, size_t privkeylen) {
@@ -165,7 +165,7 @@ bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig, uint32_
     unsigned char extra_entropy[32] = {0};
     WriteLE32(extra_entropy, test_case);
     secp256k1_ecdsa_signature sig;
-    int ret = secp256k1_ecdsa_sign(secp256k1_context_sign, &sig, hash.begin(), begin(), secp256k1_nonce_function_rfc6979, test_case ? extra_entropy : NULL);
+    int ret = secp256k1_ecdsa_sign(secp256k1_context_sign, &sig, hash.begin(), begin(), secp256k1_nonce_function_rfc6979, test_case ? extra_entropy : nullptr);
     assert(ret);
     secp256k1_ecdsa_signature_serialize_der(secp256k1_context_sign, (unsigned char*)vchSig.data(), &nSigLen, &sig);
     vchSig.resize(nSigLen);
@@ -192,7 +192,7 @@ bool CKey::SignCompact(const uint256 &hash, std::vector<unsigned char>& vchSig)
     vchSig.resize(65);
     int rec = -1;
     secp256k1_ecdsa_recoverable_signature sig;
-    int ret = secp256k1_ecdsa_sign_recoverable(secp256k1_context_sign, &sig, hash.begin(), begin(), secp256k1_nonce_function_rfc6979, NULL);
+    int ret = secp256k1_ecdsa_sign_recoverable(secp256k1_context_sign, &sig, hash.begin(), begin(), secp256k1_nonce_function_rfc6979, nullptr);
     assert(ret);
     secp256k1_ecdsa_recoverable_signature_serialize_compact(secp256k1_context_sign, (unsigned char*)&vchSig[1], &rec, &sig);
     assert(ret);
@@ -289,10 +289,10 @@ bool ECC_InitSanityCheck() {
 }
 
 void ECC_Start() {
-    assert(secp256k1_context_sign == NULL);
+    assert(secp256k1_context_sign == nullptr);
 
     secp256k1_context *ctx = secp256k1_context_create(SECP256K1_CONTEXT_SIGN);
-    assert(ctx != NULL);
+    assert(ctx != nullptr);
 
     {
         // Pass in a random blinding seed to the secp256k1 context.
@@ -307,7 +307,7 @@ void ECC_Start() {
 
 void ECC_Stop() {
     secp256k1_context *ctx = secp256k1_context_sign;
-    secp256k1_context_sign = NULL;
+    secp256k1_context_sign = nullptr;
 
     if (ctx) {
         secp256k1_context_destroy(ctx);
diff --git a/src/key.h b/src/key.h
index 2c6f15172..54b5be227 100644
--- a/src/key.h
+++ b/src/key.h
@@ -56,11 +56,6 @@ class CKey
         keydata.resize(32);
     }
 
-    //! Destructor (again necessary because of memlocking).
-    ~CKey()
-    {
-    }
-
     friend bool operator==(const CKey& a, const CKey& b)
     {
         return a.fCompressed == b.fCompressed &&
@@ -172,6 +167,8 @@ struct CExtKey {
     {
         unsigned int len = ::ReadCompactSize(s);
         unsigned char code[BIP32_EXTKEY_SIZE];
+        if (len != BIP32_EXTKEY_SIZE)
+            throw std::runtime_error("Invalid extended key size\n");
         s.read((char *)&code[0], len);
         Decode(code);
     }
diff --git a/src/keystore.h b/src/keystore.h
index 965ae0c79..9b85ddb0e 100644
--- a/src/keystore.h
+++ b/src/keystore.h
@@ -30,7 +30,7 @@ class CKeyStore
     //! Check whether a key corresponding to a given address is present in the store.
     virtual bool HaveKey(const CKeyID &address) const =0;
     virtual bool GetKey(const CKeyID &address, CKey& keyOut) const =0;
-    virtual void GetKeys(std::set<CKeyID> &setAddress) const =0;
+    virtual std::set<CKeyID> GetKeys() const =0;
     virtual bool GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const =0;
 
     //! Support for BIP 0013 : see https://github.com/bitcoin/bips/blob/master/bip-0013.mediawiki
@@ -71,18 +71,14 @@ class CBasicKeyStore : public CKeyStore
         }
         return result;
     }
-    void GetKeys(std::set<CKeyID> &setAddress) const override
+    std::set<CKeyID> GetKeys() const override
     {
-        setAddress.clear();
-        {
-            LOCK(cs_KeyStore);
-            KeyMap::const_iterator mi = mapKeys.begin();
-            while (mi != mapKeys.end())
-            {
-                setAddress.insert((*mi).first);
-                mi++;
-            }
+        LOCK(cs_KeyStore);
+        std::set<CKeyID> set_address;
+        for (const auto& mi : mapKeys) {
+            set_address.insert(mi.first);
         }
+        return set_address;
     }
     bool GetKey(const CKeyID &address, CKey &keyOut) const override
     {
@@ -97,14 +93,14 @@ class CBasicKeyStore : public CKeyStore
         }
         return false;
     }
-    virtual bool AddCScript(const CScript& redeemScript) override;
-    virtual bool HaveCScript(const CScriptID &hash) const override;
-    virtual bool GetCScript(const CScriptID &hash, CScript& redeemScriptOut) const override;
+    bool AddCScript(const CScript& redeemScript) override;
+    bool HaveCScript(const CScriptID &hash) const override;
+    bool GetCScript(const CScriptID &hash, CScript& redeemScriptOut) const override;
 
-    virtual bool AddWatchOnly(const CScript &dest) override;
-    virtual bool RemoveWatchOnly(const CScript &dest) override;
-    virtual bool HaveWatchOnly(const CScript &dest) const override;
-    virtual bool HaveWatchOnly() const override;
+    bool AddWatchOnly(const CScript &dest) override;
+    bool RemoveWatchOnly(const CScript &dest) override;
+    bool HaveWatchOnly(const CScript &dest) const override;
+    bool HaveWatchOnly() const override;
 };
 
 typedef std::vector<unsigned char, secure_allocator<unsigned char> > CKeyingMaterial;
diff --git a/src/limitedmap.h b/src/limitedmap.h
index e9dcb6def..7afc8b458 100644
--- a/src/limitedmap.h
+++ b/src/limitedmap.h
@@ -27,7 +27,7 @@ class limitedmap
     size_type nMaxSize;
 
 public:
-    limitedmap(size_type nMaxSizeIn)
+    explicit limitedmap(size_type nMaxSizeIn)
     {
         assert(nMaxSizeIn > 0);
         nMaxSize = nMaxSizeIn;
diff --git a/src/merkleblock.cpp b/src/merkleblock.cpp
index f0abea061..3f07b4dac 100644
--- a/src/merkleblock.cpp
+++ b/src/merkleblock.cpp
@@ -9,33 +9,8 @@
 #include "consensus/consensus.h"
 #include "utilstrencodings.h"
 
-CMerkleBlock::CMerkleBlock(const CBlock& block, CBloomFilter& filter)
-{
-    header = block.GetBlockHeader();
 
-    std::vector<bool> vMatch;
-    std::vector<uint256> vHashes;
-
-    vMatch.reserve(block.vtx.size());
-    vHashes.reserve(block.vtx.size());
-
-    for (unsigned int i = 0; i < block.vtx.size(); i++)
-    {
-        const uint256& hash = block.vtx[i]->GetHash();
-        if (filter.IsRelevantAndUpdate(*block.vtx[i]))
-        {
-            vMatch.push_back(true);
-            vMatchedTxn.push_back(std::make_pair(i, hash));
-        }
-        else
-            vMatch.push_back(false);
-        vHashes.push_back(hash);
-    }
-
-    txn = CPartialMerkleTree(vHashes, vMatch);
-}
-
-CMerkleBlock::CMerkleBlock(const CBlock& block, const std::set<uint256>& txids)
+CMerkleBlock::CMerkleBlock(const CBlock& block, CBloomFilter* filter, const std::set<uint256>* txids)
 {
     header = block.GetBlockHeader();
 
@@ -48,10 +23,14 @@ CMerkleBlock::CMerkleBlock(const CBlock& block, const std::set<uint256>& txids)
     for (unsigned int i = 0; i < block.vtx.size(); i++)
     {
         const uint256& hash = block.vtx[i]->GetHash();
-        if (txids.count(hash))
+        if (txids && txids->count(hash)) {
             vMatch.push_back(true);
-        else
+        } else if (filter && filter->IsRelevantAndUpdate(*block.vtx[i])) {
+            vMatch.push_back(true);
+            vMatchedTxn.emplace_back(i, hash);
+        } else {
             vMatch.push_back(false);
+        }
         vHashes.push_back(hash);
     }
 
diff --git a/src/merkleblock.h b/src/merkleblock.h
index f590c487d..6c05f2c1f 100644
--- a/src/merkleblock.h
+++ b/src/merkleblock.h
@@ -63,7 +63,7 @@ class CPartialMerkleTree
     bool fBad;
 
     /** helper function to efficiently calculate the number of nodes at given height in the merkle tree */
-    unsigned int CalcTreeWidth(int height) {
+    unsigned int CalcTreeWidth(int height) const {
         return (nTransactions+(1 << height)-1) >> height;
     }
 
@@ -131,8 +131,12 @@ class CMerkleBlock
     CBlockHeader header;
     CPartialMerkleTree txn;
 
-public:
-    /** Public only for unit testing and relay testing (not relayed) */
+    /**
+     * Public only for unit testing and relay testing (not relayed).
+     *
+     * Used only when a bloom filter is specified to allow
+     * testing the transactions which matched the bloom filter.
+     */
     std::vector<std::pair<unsigned int, uint256> > vMatchedTxn;
 
     /**
@@ -140,10 +144,10 @@ class CMerkleBlock
      * Note that this will call IsRelevantAndUpdate on the filter for each transaction,
      * thus the filter will likely be modified.
      */
-    CMerkleBlock(const CBlock& block, CBloomFilter& filter);
+    CMerkleBlock(const CBlock& block, CBloomFilter& filter) : CMerkleBlock(block, &filter, nullptr) { }
 
     // Create from a CBlock, matching the txids in the set
-    CMerkleBlock(const CBlock& block, const std::set<uint256>& txids);
+    CMerkleBlock(const CBlock& block, const std::set<uint256>& txids) : CMerkleBlock(block, nullptr, &txids) { }
 
     CMerkleBlock() {}
 
@@ -154,6 +158,10 @@ class CMerkleBlock
         READWRITE(header);
         READWRITE(txn);
     }
+
+private:
+    // Combined constructor to consolidate code
+    CMerkleBlock(const CBlock& block, CBloomFilter* filter, const std::set<uint256>* txids);
 };
 
 #endif // BITCOIN_MERKLEBLOCK_H
diff --git a/src/miner.cpp b/src/miner.cpp
index 130f982df..e1b6ba5a2 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -43,7 +43,6 @@
 // its ancestors.
 
 uint64_t nLastBlockTx = 0;
-uint64_t nLastBlockSize = 0;
 uint64_t nLastBlockWeight = 0;
 
 int64_t UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev)
@@ -64,7 +63,6 @@ int64_t UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParam
 BlockAssembler::Options::Options() {
     blockMinFeeRate = CFeeRate(DEFAULT_BLOCK_MIN_TX_FEE);
     nBlockMaxWeight = DEFAULT_BLOCK_MAX_WEIGHT;
-    nBlockMaxSize = DEFAULT_BLOCK_MAX_SIZE;
 }
 
 BlockAssembler::BlockAssembler(const CChainParams& params, const Options& options) : chainparams(params)
@@ -72,10 +70,6 @@ BlockAssembler::BlockAssembler(const CChainParams& params, const Options& option
     blockMinFeeRate = options.blockMinFeeRate;
     // Limit weight to between 4K and MAX_BLOCK_WEIGHT-4K for sanity:
     nBlockMaxWeight = std::max<size_t>(4000, std::min<size_t>(MAX_BLOCK_WEIGHT - 4000, options.nBlockMaxWeight));
-    // Limit size to between 1K and MAX_BLOCK_SERIALIZED_SIZE-1K for sanity:
-    nBlockMaxSize = std::max<size_t>(1000, std::min<size_t>(MAX_BLOCK_SERIALIZED_SIZE - 1000, options.nBlockMaxSize));
-    // Whether we need to account for byte usage (in addition to weight usage)
-    fNeedSizeAccounting = (nBlockMaxSize < MAX_BLOCK_SERIALIZED_SIZE - 1000);
 }
 
 static BlockAssembler::Options DefaultOptions(const CChainParams& params)
@@ -85,23 +79,10 @@ static BlockAssembler::Options DefaultOptions(const CChainParams& params)
     // If only one is given, only restrict the specified resource.
     // If both are given, restrict both.
     BlockAssembler::Options options;
-    options.nBlockMaxWeight = DEFAULT_BLOCK_MAX_WEIGHT;
-    options.nBlockMaxSize = DEFAULT_BLOCK_MAX_SIZE;
-    bool fWeightSet = false;
-    if (IsArgSet("-blockmaxweight")) {
-        options.nBlockMaxWeight = GetArg("-blockmaxweight", DEFAULT_BLOCK_MAX_WEIGHT);
-        options.nBlockMaxSize = MAX_BLOCK_SERIALIZED_SIZE;
-        fWeightSet = true;
-    }
-    if (IsArgSet("-blockmaxsize")) {
-        options.nBlockMaxSize = GetArg("-blockmaxsize", DEFAULT_BLOCK_MAX_SIZE);
-        if (!fWeightSet) {
-            options.nBlockMaxWeight = options.nBlockMaxSize * WITNESS_SCALE_FACTOR;
-        }
-    }
-    if (IsArgSet("-blockmintxfee")) {
+    options.nBlockMaxWeight = gArgs.GetArg("-blockmaxweight", DEFAULT_BLOCK_MAX_WEIGHT);
+    if (gArgs.IsArgSet("-blockmintxfee")) {
         CAmount n = 0;
-        ParseMoney(GetArg("-blockmintxfee", ""), n);
+        ParseMoney(gArgs.GetArg("-blockmintxfee", ""), n);
         options.blockMinFeeRate = CFeeRate(n);
     } else {
         options.blockMinFeeRate = CFeeRate(DEFAULT_BLOCK_MIN_TX_FEE);
@@ -116,7 +97,6 @@ void BlockAssembler::resetBlock()
     inBlock.clear();
 
     // Reserve space for coinbase tx
-    nBlockSize = 1000;
     nBlockWeight = 4000;
     nBlockSigOpsCost = 400;
     fIncludeWitness = false;
@@ -145,13 +125,14 @@ std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& sc
 
     LOCK2(cs_main, mempool.cs);
     CBlockIndex* pindexPrev = chainActive.Tip();
+    assert(pindexPrev != nullptr);
     nHeight = pindexPrev->nHeight + 1;
 
     pblock->nVersion = ComputeBlockVersion(pindexPrev, chainparams.GetConsensus());
     // -regtest only: allow overriding block.nVersion with
     // -blockversion=N to test forking scenarios
     if (chainparams.MineBlocksOnDemand())
-        pblock->nVersion = GetArg("-blockversion", pblock->nVersion);
+        pblock->nVersion = gArgs.GetArg("-blockversion", pblock->nVersion);
 
     pblock->nTime = GetAdjustedTime();
     const int64_t nMedianTimePast = pindexPrev->GetMedianTimePast();
@@ -175,7 +156,6 @@ std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& sc
     int64_t nTime1 = GetTimeMicros();
 
     nLastBlockTx = nBlockTx;
-    nLastBlockSize = nBlockSize;
     nLastBlockWeight = nBlockWeight;
 
     // Create coinbase transaction.
@@ -190,8 +170,7 @@ std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& sc
     pblocktemplate->vchCoinbaseCommitment = GenerateCoinbaseCommitment(*pblock, pindexPrev, chainparams.GetConsensus());
     pblocktemplate->vTxFees[0] = -nFees;
 
-    uint64_t nSerializeSize = GetSerializeSize(*pblock, SER_NETWORK, PROTOCOL_VERSION);
-    LogPrintf("CreateNewBlock(): total size: %u block weight: %u txs: %u fees: %ld sigops %d\n", nSerializeSize, GetBlockWeight(*pblock), nBlockTx, nFees, nBlockSigOpsCost);
+    LogPrintf("CreateNewBlock(): block weight: %u txs: %u fees: %ld sigops %d\n", GetBlockWeight(*pblock), nBlockTx, nFees, nBlockSigOpsCost);
 
     // Fill in header
     pblock->hashPrevBlock  = pindexPrev->GetBlockHash();
@@ -225,7 +204,7 @@ void BlockAssembler::onlyUnconfirmed(CTxMemPool::setEntries& testSet)
     }
 }
 
-bool BlockAssembler::TestPackage(uint64_t packageSize, int64_t packageSigOpsCost)
+bool BlockAssembler::TestPackage(uint64_t packageSize, int64_t packageSigOpsCost) const
 {
     // TODO: switch to weight-based accounting for packages instead of vsize-based accounting.
     if (nBlockWeight + WITNESS_SCALE_FACTOR * packageSize >= nBlockMaxWeight)
@@ -239,22 +218,13 @@ bool BlockAssembler::TestPackage(uint64_t packageSize, int64_t packageSigOpsCost
 // - transaction finality (locktime)
 // - premature witness (in case segwit transactions are added to mempool before
 //   segwit activation)
-// - serialized size (in case -blockmaxsize is in use)
 bool BlockAssembler::TestPackageTransactions(const CTxMemPool::setEntries& package)
 {
-    uint64_t nPotentialBlockSize = nBlockSize; // only used with fNeedSizeAccounting
     for (const CTxMemPool::txiter it : package) {
         if (!IsFinalTx(it->GetTx(), nHeight, nLockTimeCutoff))
             return false;
         if (!fIncludeWitness && it->GetTx().HasWitness())
             return false;
-        if (fNeedSizeAccounting) {
-            uint64_t nTxSize = ::GetSerializeSize(it->GetTx(), SER_NETWORK, PROTOCOL_VERSION);
-            if (nPotentialBlockSize + nTxSize >= nBlockMaxSize) {
-                return false;
-            }
-            nPotentialBlockSize += nTxSize;
-        }
     }
     return true;
 }
@@ -264,16 +234,13 @@ void BlockAssembler::AddToBlock(CTxMemPool::txiter iter)
     pblock->vtx.emplace_back(iter->GetSharedTx());
     pblocktemplate->vTxFees.push_back(iter->GetFee());
     pblocktemplate->vTxSigOpsCost.push_back(iter->GetSigOpCost());
-    if (fNeedSizeAccounting) {
-        nBlockSize += ::GetSerializeSize(iter->GetTx(), SER_NETWORK, PROTOCOL_VERSION);
-    }
     nBlockWeight += iter->GetTxWeight();
     ++nBlockTx;
     nBlockSigOpsCost += iter->GetSigOpCost();
     nFees += iter->GetFee();
     inBlock.insert(iter);
 
-    bool fPrintPriority = GetBoolArg("-printpriority", DEFAULT_PRINTPRIORITY);
+    bool fPrintPriority = gArgs.GetBoolArg("-printpriority", DEFAULT_PRINTPRIORITY);
     if (fPrintPriority) {
         LogPrintf("fee %s txid %s\n",
                   CFeeRate(iter->GetModifiedFee(), iter->GetTxSize()).ToString(),
diff --git a/src/miner.h b/src/miner.h
index 5c9cfd78f..db165e71c 100644
--- a/src/miner.h
+++ b/src/miner.h
@@ -11,8 +11,8 @@
 
 #include <stdint.h>
 #include <memory>
-#include "boost/multi_index_container.hpp"
-#include "boost/multi_index/ordered_index.hpp"
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/ordered_index.hpp>
 
 class CBlockIndex;
 class CChainParams;
@@ -33,7 +33,7 @@ struct CBlockTemplate
 // Container for tracking updates to ancestor feerate as we include (parent)
 // transactions in a block
 struct CTxMemPoolModifiedEntry {
-    CTxMemPoolModifiedEntry(CTxMemPool::txiter entry)
+    explicit CTxMemPoolModifiedEntry(CTxMemPool::txiter entry)
     {
         iter = entry;
         nSizeWithAncestors = entry->GetSizeWithAncestors();
@@ -116,7 +116,7 @@ typedef indexed_modified_transaction_set::index<ancestor_score>::type::iterator
 
 struct update_for_parent_inclusion
 {
-    update_for_parent_inclusion(CTxMemPool::txiter it) : iter(it) {}
+    explicit update_for_parent_inclusion(CTxMemPool::txiter it) : iter(it) {}
 
     void operator() (CTxMemPoolModifiedEntry &e)
     {
@@ -139,13 +139,11 @@ class BlockAssembler
 
     // Configuration parameters for the block size
     bool fIncludeWitness;
-    unsigned int nBlockMaxWeight, nBlockMaxSize;
-    bool fNeedSizeAccounting;
+    unsigned int nBlockMaxWeight;
     CFeeRate blockMinFeeRate;
 
     // Information on the current status of the block
     uint64_t nBlockWeight;
-    uint64_t nBlockSize;
     uint64_t nBlockTx;
     uint64_t nBlockSigOpsCost;
     CAmount nFees;
@@ -160,11 +158,10 @@ class BlockAssembler
     struct Options {
         Options();
         size_t nBlockMaxWeight;
-        size_t nBlockMaxSize;
         CFeeRate blockMinFeeRate;
     };
 
-    BlockAssembler(const CChainParams& params);
+    explicit BlockAssembler(const CChainParams& params);
     BlockAssembler(const CChainParams& params, const Options& options);
 
     /** Construct a new block template with coinbase to scriptPubKeyIn */
@@ -187,7 +184,7 @@ class BlockAssembler
     /** Remove confirmed (inBlock) entries from given set */
     void onlyUnconfirmed(CTxMemPool::setEntries& testSet);
     /** Test if a new package would "fit" in the block */
-    bool TestPackage(uint64_t packageSize, int64_t packageSigOpsCost);
+    bool TestPackage(uint64_t packageSize, int64_t packageSigOpsCost) const;
     /** Perform checks on each transaction in a package:
       * locktime, premature-witness, serialized size (if necessary)
       * These checks should always succeed, and they're here
diff --git a/src/net.cpp b/src/net.cpp
index ca9a173ab..258599747 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -89,10 +89,6 @@ std::string strSubVersion;
 
 limitedmap<uint256, int64_t> mapAlreadyAskedFor(MAX_INV_SZ);
 
-// Signals for message handling
-static CNodeSignals g_signals;
-CNodeSignals& GetNodeSignals() { return g_signals; }
-
 void CConnman::AddOneShot(const std::string& strDest)
 {
     LOCK(cs_vOneShots);
@@ -101,7 +97,7 @@ void CConnman::AddOneShot(const std::string& strDest)
 
 unsigned short GetListenPort()
 {
-    return (unsigned short)(GetArg("-port", Params().GetDefaultPort()));
+    return (unsigned short)(gArgs.GetArg("-port", Params().GetDefaultPort()));
 }
 
 // find 'best' local address for a particular peer
@@ -139,11 +135,10 @@ static std::vector<CAddress> convertSeed6(const std::vector<SeedSpec6> &vSeedsIn
     const int64_t nOneWeek = 7*24*60*60;
     std::vector<CAddress> vSeedsOut;
     vSeedsOut.reserve(vSeedsIn.size());
-    for (std::vector<SeedSpec6>::const_iterator i(vSeedsIn.begin()); i != vSeedsIn.end(); ++i)
-    {
+    for (const auto& seed_in : vSeedsIn) {
         struct in6_addr ip;
-        memcpy(&ip, i->addr, sizeof(ip));
-        CAddress addr(CService(ip, i->port), NODE_NETWORK);
+        memcpy(&ip, seed_in.addr, sizeof(ip));
+        CAddress addr(CService(ip, seed_in.port), NODE_NETWORK);
         addr.nTime = GetTime() - GetRand(nOneWeek) - nOneWeek;
         vSeedsOut.push_back(addr);
     }
@@ -303,19 +298,23 @@ bool IsReachable(const CNetAddr& addr)
 CNode* CConnman::FindNode(const CNetAddr& ip)
 {
     LOCK(cs_vNodes);
-    for (CNode* pnode : vNodes)
-        if ((CNetAddr)pnode->addr == ip)
-            return (pnode);
-    return NULL;
+    for (CNode* pnode : vNodes) {
+        if ((CNetAddr)pnode->addr == ip) {
+            return pnode;
+        }
+    }
+    return nullptr;
 }
 
 CNode* CConnman::FindNode(const CSubNet& subNet)
 {
     LOCK(cs_vNodes);
-    for (CNode* pnode : vNodes)
-    if (subNet.Match((CNetAddr)pnode->addr))
-        return (pnode);
-    return NULL;
+    for (CNode* pnode : vNodes) {
+        if (subNet.Match((CNetAddr)pnode->addr)) {
+            return pnode;
+        }
+    }
+    return nullptr;
 }
 
 CNode* CConnman::FindNode(const std::string& addrName)
@@ -323,19 +322,21 @@ CNode* CConnman::FindNode(const std::string& addrName)
     LOCK(cs_vNodes);
     for (CNode* pnode : vNodes) {
         if (pnode->GetAddrName() == addrName) {
-            return (pnode);
+            return pnode;
         }
     }
-    return NULL;
+    return nullptr;
 }
 
 CNode* CConnman::FindNode(const CService& addr)
 {
     LOCK(cs_vNodes);
-    for (CNode* pnode : vNodes)
-        if ((CService)pnode->addr == addr)
-            return (pnode);
-    return NULL;
+    for (CNode* pnode : vNodes) {
+        if ((CService)pnode->addr == addr) {
+            return pnode;
+        }
+    }
+    return nullptr;
 }
 
 bool CConnman::CheckIncomingNonce(uint64_t nonce)
@@ -366,16 +367,16 @@ static CAddress GetBindAddress(SOCKET sock)
 
 CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure)
 {
-    if (pszDest == NULL) {
+    if (pszDest == nullptr) {
         if (IsLocal(addrConnect))
-            return NULL;
+            return nullptr;
 
         // Look for an existing connection
         CNode* pnode = FindNode((CService)addrConnect);
         if (pnode)
         {
             LogPrintf("Failed to open new connection, already connected\n");
-            return NULL;
+            return nullptr;
         }
     }
 
@@ -384,19 +385,16 @@ CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCo
         pszDest ? pszDest : addrConnect.ToString(),
         pszDest ? 0.0 : (double)(GetAdjustedTime() - addrConnect.nTime)/3600.0);
 
-    // Connect
-    SOCKET hSocket;
-    bool proxyConnectionFailed = false;
-    if (pszDest ? ConnectSocketByName(addrConnect, hSocket, pszDest, Params().GetDefaultPort(), nConnectTimeout, &proxyConnectionFailed) :
-                  ConnectSocket(addrConnect, hSocket, nConnectTimeout, &proxyConnectionFailed))
-    {
-        if (!IsSelectableSocket(hSocket)) {
-            LogPrintf("Cannot create connection: non-selectable socket created (fd >= FD_SETSIZE ?)\n");
-            CloseSocket(hSocket);
-            return NULL;
-        }
-
-        if (pszDest && addrConnect.IsValid()) {
+    // Resolve
+    const int default_port = Params().GetDefaultPort();
+    if (pszDest) {
+        std::vector<CService> resolved;
+        if (Lookup(pszDest, resolved,  default_port, fNameLookup && !HaveNameProxy(), 256) && !resolved.empty()) {
+            addrConnect = CAddress(resolved[GetRand(resolved.size())], NODE_NONE);
+            if (!addrConnect.IsValid()) {
+                LogPrint(BCLog::NET, "Resolver returned invalid address %s for %s", addrConnect.ToString(), pszDest);
+                return nullptr;
+            }
             // It is possible that we already have a connection to the IP/port pszDest resolved to.
             // In that case, drop the connection that was just created, and return the existing CNode instead.
             // Also store the name we used to connect in that CNode, so that future FindNode() calls to that
@@ -406,30 +404,52 @@ CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCo
             if (pnode)
             {
                 pnode->MaybeSetAddrName(std::string(pszDest));
-                CloseSocket(hSocket);
                 LogPrintf("Failed to open new connection, already connected\n");
-                return NULL;
+                return nullptr;
             }
         }
+    }
 
-        addrman.Attempt(addrConnect, fCountFailure);
+    // Connect
+    bool connected = false;
+    SOCKET hSocket;
+    proxyType proxy;
+    if (addrConnect.IsValid()) {
+        bool proxyConnectionFailed = false;
+
+        if (GetProxy(addrConnect.GetNetwork(), proxy))
+            connected = ConnectThroughProxy(proxy, addrConnect.ToStringIP(), addrConnect.GetPort(), hSocket, nConnectTimeout, &proxyConnectionFailed);
+        else // no proxy needed (none set for target network)
+            connected = ConnectSocketDirectly(addrConnect, hSocket, nConnectTimeout);
+        if (!proxyConnectionFailed) {
+            // If a connection to the node was attempted, and failure (if any) is not caused by a problem connecting to
+            // the proxy, mark this as an attempt.
+            addrman.Attempt(addrConnect, fCountFailure);
+        }
+    } else if (pszDest && GetNameProxy(proxy)) {
+        std::string host;
+        int port = default_port;
+        SplitHostPort(std::string(pszDest), port, host);
+        connected = ConnectThroughProxy(proxy, host, port, hSocket, nConnectTimeout, nullptr);
+    }
+    if (connected) {
+        if (!IsSelectableSocket(hSocket)) {
+            LogPrintf("Cannot create connection: non-selectable socket created (fd >= FD_SETSIZE ?)\n");
+            CloseSocket(hSocket);
+            return nullptr;
+        }
 
         // Add node
         NodeId id = GetNewNodeId();
         uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
         CAddress addr_bind = GetBindAddress(hSocket);
         CNode* pnode = new CNode(id, nLocalServices, GetBestHeight(), hSocket, addrConnect, CalculateKeyedNetGroup(addrConnect), nonce, addr_bind, pszDest ? pszDest : "", false);
-        pnode->nServicesExpected = ServiceFlags(addrConnect.nServices & nRelevantServices);
         pnode->AddRef();
 
         return pnode;
-    } else if (!proxyConnectionFailed) {
-        // If connecting to the node failed, and failure is not caused by a problem connecting to
-        // the proxy, mark this as an attempt.
-        addrman.Attempt(addrConnect, fCountFailure);
     }
 
-    return NULL;
+    return nullptr;
 }
 
 void CConnman::DumpBanlist()
@@ -478,10 +498,9 @@ void CConnman::ClearBanned()
 bool CConnman::IsBanned(CNetAddr ip)
 {
     LOCK(cs_setBanned);
-    for (banmap_t::iterator it = setBanned.begin(); it != setBanned.end(); it++)
-    {
-        CSubNet subNet = (*it).first;
-        CBanEntry banEntry = (*it).second;
+    for (const auto& it : setBanned) {
+        CSubNet subNet = it.first;
+        CBanEntry banEntry = it.second;
 
         if (subNet.Match(ip) && GetTime() < banEntry.nBanUntil) {
             return true;
@@ -514,7 +533,7 @@ void CConnman::Ban(const CSubNet& subNet, const BanReason &banReason, int64_t ba
     banEntry.banReason = banReason;
     if (bantimeoffset <= 0)
     {
-        bantimeoffset = GetArg("-bantime", DEFAULT_MISBEHAVING_BANTIME);
+        bantimeoffset = gArgs.GetArg("-bantime", DEFAULT_MISBEHAVING_BANTIME);
         sinceUnixEpoch = false;
     }
     banEntry.nBanUntil = (sinceUnixEpoch ? 0 : GetTime() )+bantimeoffset;
@@ -665,7 +684,7 @@ void CNode::copyStats(CNodeStats &stats)
         X(cleanSubVer);
     }
     X(fInbound);
-    X(fAddnode);
+    X(m_manual_connection);
     X(nStartingHeight);
     {
         LOCK(cs_vSend);
@@ -956,7 +975,7 @@ bool CConnman::AttemptToEvictConnection()
     {
         LOCK(cs_vNodes);
 
-        for (CNode *node : vNodes) {
+        for (const CNode* node : vNodes) {
             if (node->fWhitelisted)
                 continue;
             if (!node->fInbound)
@@ -965,8 +984,8 @@ bool CConnman::AttemptToEvictConnection()
                 continue;
             NodeEvictionCandidate candidate = {node->GetId(), node->nTimeConnected, node->nMinPingUsecTime,
                                                node->nLastBlockTime, node->nLastTXTime,
-                                               (node->nServices & nRelevantServices) == nRelevantServices,
-                                               node->fRelayTxes, node->pfilter != NULL, node->addr, node->nKeyedNetGroup};
+                                               HasAllDesirableServiceFlags(node->nServices),
+                                               node->fRelayTxes, node->pfilter != nullptr, node->addr, node->nKeyedNetGroup};
             vEvictionCandidates.push_back(candidate);
         }
     }
@@ -1034,9 +1053,9 @@ bool CConnman::AttemptToEvictConnection()
     // Disconnect from the network group with the most connections
     NodeId evicted = vEvictionCandidates.front().id;
     LOCK(cs_vNodes);
-    for(std::vector<CNode*>::const_iterator it(vNodes.begin()); it != vNodes.end(); ++it) {
-        if ((*it)->GetId() == evicted) {
-            (*it)->fDisconnect = true;
+    for (CNode* pnode : vNodes) {
+        if (pnode->GetId() == evicted) {
+            pnode->fDisconnect = true;
             return true;
         }
     }
@@ -1060,9 +1079,9 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
     bool whitelisted = hListenSocket.whitelisted || IsWhitelistedRange(addr);
     {
         LOCK(cs_vNodes);
-        for (CNode* pnode : vNodes)
-            if (pnode->fInbound)
-                nInbound++;
+        for (const CNode* pnode : vNodes) {
+            if (pnode->fInbound) nInbound++;
+        }
     }
 
     if (hSocket == INVALID_SOCKET)
@@ -1114,7 +1133,7 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
     CNode* pnode = new CNode(id, nLocalServices, GetBestHeight(), hSocket, addr, CalculateKeyedNetGroup(addr), nonce, addr_bind, "", true);
     pnode->AddRef();
     pnode->fWhitelisted = whitelisted;
-    GetNodeSignals().InitializeNode(pnode, *this);
+    m_msgproc->InitializeNode(pnode);
 
     LogPrint(BCLog::NET, "connection from %s accepted\n", addr.ToString());
 
@@ -1438,9 +1457,9 @@ void CConnman::WakeMessageHandler()
 void ThreadMapPort()
 {
     std::string port = strprintf("%u", GetListenPort());
-    const char * multicastif = 0;
-    const char * minissdpdpath = 0;
-    struct UPNPDev * devlist = 0;
+    const char * multicastif = nullptr;
+    const char * minissdpdpath = nullptr;
+    struct UPNPDev * devlist = nullptr;
     char lanaddr[64];
 
 #ifndef UPNPDISCOVER_SUCCESS
@@ -1510,13 +1529,13 @@ void ThreadMapPort()
         {
             r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype, port.c_str(), "TCP", 0);
             LogPrintf("UPNP_DeletePortMapping() returned: %d\n", r);
-            freeUPNPDevlist(devlist); devlist = 0;
+            freeUPNPDevlist(devlist); devlist = nullptr;
             FreeUPNPUrls(&urls);
             throw;
         }
     } else {
         LogPrintf("No valid UPnP IGDs found\n");
-        freeUPNPDevlist(devlist); devlist = 0;
+        freeUPNPDevlist(devlist); devlist = nullptr;
         if (r != 0)
             FreeUPNPUrls(&urls);
     }
@@ -1524,7 +1543,7 @@ void ThreadMapPort()
 
 void MapPort(bool fUseUPnP)
 {
-    static boost::thread* upnp_thread = NULL;
+    static boost::thread* upnp_thread = nullptr;
 
     if (fUseUPnP)
     {
@@ -1539,7 +1558,7 @@ void MapPort(bool fUseUPnP)
         upnp_thread->interrupt();
         upnp_thread->join();
         delete upnp_thread;
-        upnp_thread = NULL;
+        upnp_thread = nullptr;
     }
 }
 
@@ -1575,14 +1594,14 @@ void CConnman::ThreadDNSAddressSeed()
     //  creating fewer identifying DNS requests, reduces trust by giving seeds
     //  less influence on the network topology, and reduces traffic to the seeds.
     if ((addrman.size() > 0) &&
-        (!GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED))) {
+        (!gArgs.GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED))) {
         if (!interruptNet.sleep_for(std::chrono::seconds(11)))
             return;
 
         LOCK(cs_vNodes);
         int nRelevant = 0;
         for (auto pnode : vNodes) {
-            nRelevant += pnode->fSuccessfullyConnected && ((pnode->nServices & nRelevantServices) == nRelevantServices);
+            nRelevant += pnode->fSuccessfullyConnected && !pnode->fFeeler && !pnode->fOneShot && !pnode->m_manual_connection && !pnode->fInbound;
         }
         if (nRelevant >= 2) {
             LogPrintf("P2P peers available. Skipped DNS seeding.\n");
@@ -1604,7 +1623,7 @@ void CConnman::ThreadDNSAddressSeed()
         } else {
             std::vector<CNetAddr> vIPs;
             std::vector<CAddress> vAdd;
-            ServiceFlags requiredServiceBits = nRelevantServices;
+            ServiceFlags requiredServiceBits = GetDesirableServiceFlags(NODE_NONE);
             std::string host = GetDNSHost(seed, &requiredServiceBits);
             CNetAddr resolveSource;
             if (!resolveSource.SetInternal(host)) {
@@ -1674,18 +1693,18 @@ void CConnman::ProcessOneShot()
     }
 }
 
-void CConnman::ThreadOpenConnections()
+void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
 {
     // Connect to specific addresses
-    if (gArgs.IsArgSet("-connect"))
+    if (!connect.empty())
     {
         for (int64_t nLoop = 0;; nLoop++)
         {
             ProcessOneShot();
-            for (const std::string& strAddr : gArgs.GetArgs("-connect"))
+            for (const std::string& strAddr : connect)
             {
                 CAddress addr(CService(), NODE_NONE);
-                OpenNetworkConnection(addr, false, NULL, strAddr.c_str());
+                OpenNetworkConnection(addr, false, nullptr, strAddr.c_str(), false, false, true);
                 for (int i = 0; i < 10 && i < nLoop; i++)
                 {
                     if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
@@ -1733,17 +1752,11 @@ void CConnman::ThreadOpenConnections()
         // Only connect out to one peer per network group (/16 for IPv4).
         // Do this here so we don't have to critsect vNodes inside mapAddresses critsect.
         int nOutbound = 0;
-        int nOutboundRelevant = 0;
         std::set<std::vector<unsigned char> > setConnected;
         {
             LOCK(cs_vNodes);
             for (CNode* pnode : vNodes) {
-                if (!pnode->fInbound && !pnode->fAddnode) {
-
-                    // Count the peers that have all relevant services
-                    if (pnode->fSuccessfullyConnected && !pnode->fFeeler && ((pnode->nServices & nRelevantServices) == nRelevantServices)) {
-                        nOutboundRelevant++;
-                    }
+                if (!pnode->fInbound && !pnode->m_manual_connection) {
                     // Netgroups for inbound and addnode peers are not excluded because our goal here
                     // is to not use multiple of our limited outbound slots on a single netgroup
                     // but inbound and addnode peers do not use our outbound slots.  Inbound peers
@@ -1798,21 +1811,16 @@ void CConnman::ThreadOpenConnections()
             if (IsLimited(addr))
                 continue;
 
-            // only connect to full nodes
-            if ((addr.nServices & REQUIRED_SERVICES) != REQUIRED_SERVICES)
-                continue;
-
             // only consider very recently tried nodes after 30 failed attempts
             if (nANow - addr.nLastTry < 600 && nTries < 30)
                 continue;
 
-            // only consider nodes missing relevant services after 40 failed attempts and only if less than half the outbound are up.
-            ServiceFlags nRequiredServices = nRelevantServices;
-            if (nTries >= 40 && nOutbound < (nMaxOutbound >> 1)) {
-                nRequiredServices = REQUIRED_SERVICES;
-            }
-
-            if ((addr.nServices & nRequiredServices) != nRequiredServices) {
+            // for non-feelers, require all the services we'll want,
+            // for feelers, only require they be a full node (only because most
+            // SPV clients don't have a good address DB available)
+            if (!fFeeler && !HasAllDesirableServiceFlags(addr.nServices)) {
+                continue;
+            } else if (fFeeler && !MayHaveUsefulAddressDB(addr.nServices)) {
                 continue;
             }
 
@@ -1821,13 +1829,6 @@ void CConnman::ThreadOpenConnections()
                 continue;
 
             addrConnect = addr;
-
-            // regardless of the services assumed to be available, only require the minimum if half or more outbound have relevant services
-            if (nOutboundRelevant >= (nMaxOutbound >> 1)) {
-                addrConnect.nServices = REQUIRED_SERVICES;
-            } else {
-                addrConnect.nServices = nRequiredServices;
-            }
             break;
         }
 
@@ -1841,7 +1842,7 @@ void CConnman::ThreadOpenConnections()
                 LogPrint(BCLog::NET, "Making feeler connection to %s\n", addrConnect.ToString());
             }
 
-            OpenNetworkConnection(addrConnect, (int)setConnected.size() >= std::min(nMaxConnections - 1, 2), &grant, NULL, false, fFeeler);
+            OpenNetworkConnection(addrConnect, (int)setConnected.size() >= std::min(nMaxConnections - 1, 2), &grant, nullptr, false, fFeeler);
         }
     }
 }
@@ -1854,8 +1855,7 @@ std::vector<AddedNodeInfo> CConnman::GetAddedNodeInfo()
     {
         LOCK(cs_vAddedNodes);
         ret.reserve(vAddedNodes.size());
-        for (const std::string& strAddNode : vAddedNodes)
-            lAddresses.push_back(strAddNode);
+        std::copy(vAddedNodes.cbegin(), vAddedNodes.cend(), std::back_inserter(lAddresses));
     }
 
 
@@ -1901,11 +1901,6 @@ std::vector<AddedNodeInfo> CConnman::GetAddedNodeInfo()
 
 void CConnman::ThreadOpenAddedConnections()
 {
-    {
-        LOCK(cs_vAddedNodes);
-        vAddedNodes = gArgs.GetArgs("-addnode");
-    }
-
     while (true)
     {
         CSemaphoreGrant grant(*semAddnode);
@@ -1918,11 +1913,9 @@ void CConnman::ThreadOpenAddedConnections()
                     // the addednodeinfo state might change.
                     break;
                 }
-                // If strAddedNode is an IP/port, decode it immediately, so
-                // OpenNetworkConnection can detect existing connections to that IP/port.
                 tried = true;
-                CService service(LookupNumeric(info.strAddedNode.c_str(), Params().GetDefaultPort()));
-                OpenNetworkConnection(CAddress(service, NODE_NONE), false, &grant, info.strAddedNode.c_str(), false, false, true);
+                CAddress addr(CService(), NODE_NONE);
+                OpenNetworkConnection(addr, false, &grant, info.strAddedNode.c_str(), false, false, true);
                 if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
                     return;
             }
@@ -1934,7 +1927,7 @@ void CConnman::ThreadOpenAddedConnections()
 }
 
 // if successful, this moves the passed grant to the constructed node
-bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, bool fOneShot, bool fFeeler, bool fAddnode)
+bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, bool fOneShot, bool fFeeler, bool manual_connection)
 {
     //
     // Initiate outbound network connection
@@ -1963,10 +1956,10 @@ bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFai
         pnode->fOneShot = true;
     if (fFeeler)
         pnode->fFeeler = true;
-    if (fAddnode)
-        pnode->fAddnode = true;
+    if (manual_connection)
+        pnode->m_manual_connection = true;
 
-    GetNodeSignals().InitializeNode(pnode, *this);
+    m_msgproc->InitializeNode(pnode);
     {
         LOCK(cs_vNodes);
         vNodes.push_back(pnode);
@@ -1996,16 +1989,16 @@ void CConnman::ThreadMessageHandler()
                 continue;
 
             // Receive messages
-            bool fMoreNodeWork = GetNodeSignals().ProcessMessages(pnode, *this, flagInterruptMsgProc);
+            bool fMoreNodeWork = m_msgproc->ProcessMessages(pnode, flagInterruptMsgProc);
             fMoreWork |= (fMoreNodeWork && !pnode->fPauseSend);
             if (flagInterruptMsgProc)
                 return;
-
             // Send messages
             {
                 LOCK(pnode->cs_sendProcessing);
-                GetNodeSignals().SendMessages(pnode, *this, flagInterruptMsgProc);
+                m_msgproc->SendMessages(pnode, flagInterruptMsgProc);
             }
+
             if (flagInterruptMsgProc)
                 return;
         }
@@ -2153,9 +2146,9 @@ void Discover(boost::thread_group& threadGroup)
     struct ifaddrs* myaddrs;
     if (getifaddrs(&myaddrs) == 0)
     {
-        for (struct ifaddrs* ifa = myaddrs; ifa != NULL; ifa = ifa->ifa_next)
+        for (struct ifaddrs* ifa = myaddrs; ifa != nullptr; ifa = ifa->ifa_next)
         {
-            if (ifa->ifa_addr == NULL) continue;
+            if (ifa->ifa_addr == nullptr) continue;
             if ((ifa->ifa_flags & IFF_UP) == 0) continue;
             if (strcmp(ifa->ifa_name, "lo") == 0) continue;
             if (strcmp(ifa->ifa_name, "lo0") == 0) continue;
@@ -2208,8 +2201,8 @@ CConnman::CConnman(uint64_t nSeed0In, uint64_t nSeed1In) : nSeed0(nSeed0In), nSe
     nLastNodeId = 0;
     nSendBufferMaxSize = 0;
     nReceiveFloodSize = 0;
-    semOutbound = NULL;
-    semAddnode = NULL;
+    semOutbound = nullptr;
+    semAddnode = nullptr;
     flagInterruptMsgProc = false;
 
     Options connOptions;
@@ -2312,11 +2305,11 @@ bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
 
     fAddressesInitialized = true;
 
-    if (semOutbound == NULL) {
+    if (semOutbound == nullptr) {
         // initialize semaphore
         semOutbound = new CSemaphore(std::min((nMaxOutbound + nMaxFeeler), nMaxConnections));
     }
-    if (semAddnode == NULL) {
+    if (semAddnode == nullptr) {
         // initialize semaphore
         semAddnode = new CSemaphore(nMaxAddnode);
     }
@@ -2324,6 +2317,7 @@ bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
     //
     // Start threads
     //
+    assert(m_msgproc);
     InterruptSocks5(false);
     interruptNet.reset();
     flagInterruptMsgProc = false;
@@ -2336,7 +2330,7 @@ bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
     // Send and receive from sockets, accept connections
     threadSocketHandler = std::thread(&TraceThread<std::function<void()> >, "net", std::function<void()>(std::bind(&CConnman::ThreadSocketHandler, this)));
 
-    if (!GetBoolArg("-dnsseed", true))
+    if (!gArgs.GetBoolArg("-dnsseed", true))
         LogPrintf("DNS seeding disabled\n");
     else
         threadDNSAddressSeed = std::thread(&TraceThread<std::function<void()> >, "dnsseed", std::function<void()>(std::bind(&CConnman::ThreadDNSAddressSeed, this)));
@@ -2344,9 +2338,16 @@ bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
     // Initiate outbound connections from -addnode
     threadOpenAddedConnections = std::thread(&TraceThread<std::function<void()> >, "addcon", std::function<void()>(std::bind(&CConnman::ThreadOpenAddedConnections, this)));
 
-    // Initiate outbound connections unless connect=0
-    if (!gArgs.IsArgSet("-connect") || gArgs.GetArgs("-connect").size() != 1 || gArgs.GetArgs("-connect")[0] != "0")
-        threadOpenConnections = std::thread(&TraceThread<std::function<void()> >, "opencon", std::function<void()>(std::bind(&CConnman::ThreadOpenConnections, this)));
+    if (connOptions.m_use_addrman_outgoing && !connOptions.m_specified_outgoing.empty()) {
+        if (clientInterface) {
+            clientInterface->ThreadSafeMessageBox(
+                _("Cannot provide specific connections and have addrman find outgoing connections at the same."),
+                "", CClientUIInterface::MSG_ERROR);
+        }
+        return false;
+    }
+    if (connOptions.m_use_addrman_outgoing || !connOptions.m_specified_outgoing.empty())
+        threadOpenConnections = std::thread(&TraceThread<std::function<void()> >, "opencon", std::function<void()>(std::bind(&CConnman::ThreadOpenConnections, this, connOptions.m_specified_outgoing)));
 
     // Process messages
     threadMessageHandler = std::thread(&TraceThread<std::function<void()> >, "msghand", std::function<void()>(std::bind(&CConnman::ThreadMessageHandler, this)));
@@ -2434,18 +2435,19 @@ void CConnman::Stop()
     vNodesDisconnected.clear();
     vhListenSocket.clear();
     delete semOutbound;
-    semOutbound = NULL;
+    semOutbound = nullptr;
     delete semAddnode;
-    semAddnode = NULL;
+    semAddnode = nullptr;
 }
 
 void CConnman::DeleteNode(CNode* pnode)
 {
     assert(pnode);
     bool fUpdateConnectionTime = false;
-    GetNodeSignals().FinalizeNode(pnode->GetId(), fUpdateConnectionTime);
-    if(fUpdateConnectionTime)
+    m_msgproc->FinalizeNode(pnode->GetId(), fUpdateConnectionTime);
+    if(fUpdateConnectionTime) {
         addrman.Connected(pnode->addr);
+    }
     delete pnode;
 }
 
@@ -2483,9 +2485,8 @@ std::vector<CAddress> CConnman::GetAddresses()
 bool CConnman::AddNode(const std::string& strNode)
 {
     LOCK(cs_vAddedNodes);
-    for(std::vector<std::string>::const_iterator it = vAddedNodes.begin(); it != vAddedNodes.end(); ++it) {
-        if (strNode == *it)
-            return false;
+    for (const std::string& it : vAddedNodes) {
+        if (strNode == it) return false;
     }
 
     vAddedNodes.push_back(strNode);
@@ -2511,9 +2512,11 @@ size_t CConnman::GetNodeCount(NumConnections flags)
         return vNodes.size();
 
     int nNum = 0;
-    for(std::vector<CNode*>::const_iterator it = vNodes.begin(); it != vNodes.end(); ++it)
-        if (flags & ((*it)->fInbound ? CONNECTIONS_IN : CONNECTIONS_OUT))
+    for (const auto& pnode : vNodes) {
+        if (flags & (pnode->fInbound ? CONNECTIONS_IN : CONNECTIONS_OUT)) {
             nNum++;
+        }
+    }
 
     return nNum;
 }
@@ -2523,8 +2526,7 @@ void CConnman::GetNodeStats(std::vector<CNodeStats>& vstats)
     vstats.clear();
     LOCK(cs_vNodes);
     vstats.reserve(vNodes.size());
-    for(std::vector<CNode*>::iterator it = vNodes.begin(); it != vNodes.end(); ++it) {
-        CNode* pnode = *it;
+    for (CNode* pnode : vNodes) {
         vstats.emplace_back();
         pnode->copyStats(vstats.back());
     }
@@ -2691,7 +2693,6 @@ CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn
     nSendVersion(0)
 {
     nServices = NODE_NONE;
-    nServicesExpected = NODE_NONE;
     hSocket = hSocketIn;
     nRecvVersion = INIT_PROTO_VERSION;
     nLastSend = 0;
@@ -2704,7 +2705,7 @@ CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn
     strSubVer = "";
     fWhitelisted = false;
     fOneShot = false;
-    fAddnode = false;
+    m_manual_connection = false;
     fClient = false; // set by version message
     fFeeler = false;
     fSuccessfullyConnected = false;
diff --git a/src/net.h b/src/net.h
index 93a76fc09..f373ab0cf 100644
--- a/src/net.h
+++ b/src/net.h
@@ -33,7 +33,6 @@
 #include <arpa/inet.h>
 #endif
 
-#include <boost/signals2/signal.hpp>
 
 class CScheduler;
 class CNode;
@@ -85,8 +84,6 @@ static const bool DEFAULT_FORCEDNSSEED = false;
 static const size_t DEFAULT_MAXRECEIVEBUFFER = 5 * 1000;
 static const size_t DEFAULT_MAXSENDBUFFER    = 1 * 1000;
 
-static const ServiceFlags REQUIRED_SERVICES = NODE_NETWORK;
-
 // NOTE: When adjusting this, update rpcnet:setban's help ("24h")
 static const unsigned int DEFAULT_MISBEHAVING_BANTIME = 60 * 60 * 24;  // Default 24-hour ban
 
@@ -116,7 +113,7 @@ struct CSerializedNetMsg
     std::string command;
 };
 
-
+class NetEventsInterface;
 class CConnman
 {
 public:
@@ -131,13 +128,13 @@ class CConnman
     struct Options
     {
         ServiceFlags nLocalServices = NODE_NONE;
-        ServiceFlags nRelevantServices = NODE_NONE;
         int nMaxConnections = 0;
         int nMaxOutbound = 0;
         int nMaxAddnode = 0;
         int nMaxFeeler = 0;
         int nBestHeight = 0;
         CClientUIInterface* uiInterface = nullptr;
+        NetEventsInterface* m_msgproc = nullptr;
         unsigned int nSendBufferMaxSize = 0;
         unsigned int nReceiveFloodSize = 0;
         uint64_t nMaxOutboundTimeframe = 0;
@@ -145,22 +142,26 @@ class CConnman
         std::vector<std::string> vSeedNodes;
         std::vector<CSubNet> vWhitelistedRange;
         std::vector<CService> vBinds, vWhiteBinds;
+        bool m_use_addrman_outgoing = true;
+        std::vector<std::string> m_specified_outgoing;
+        std::vector<std::string> m_added_nodes;
     };
 
     void Init(const Options& connOptions) {
         nLocalServices = connOptions.nLocalServices;
-        nRelevantServices = connOptions.nRelevantServices;
         nMaxConnections = connOptions.nMaxConnections;
         nMaxOutbound = std::min(connOptions.nMaxOutbound, connOptions.nMaxConnections);
         nMaxAddnode = connOptions.nMaxAddnode;
         nMaxFeeler = connOptions.nMaxFeeler;
         nBestHeight = connOptions.nBestHeight;
         clientInterface = connOptions.uiInterface;
+        m_msgproc = connOptions.m_msgproc;
         nSendBufferMaxSize = connOptions.nSendBufferMaxSize;
         nReceiveFloodSize = connOptions.nReceiveFloodSize;
         nMaxOutboundTimeframe = connOptions.nMaxOutboundTimeframe;
         nMaxOutboundLimit = connOptions.nMaxOutboundLimit;
         vWhitelistedRange = connOptions.vWhitelistedRange;
+        vAddedNodes = connOptions.m_added_nodes;
     }
 
     CConnman(uint64_t seed0, uint64_t seed1);
@@ -170,7 +171,7 @@ class CConnman
     void Interrupt();
     bool GetNetworkActive() const { return fNetworkActive; };
     void SetNetworkActive(bool active);
-    bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false, bool fFeeler = false, bool fAddnode = false);
+    bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = nullptr, const char *strDest = nullptr, bool fOneShot = false, bool fFeeler = false, bool manual_connection = false);
     bool CheckIncomingNonce(uint64_t nonce);
 
     bool ForNode(NodeId id, std::function<bool(CNode* pnode)> func);
@@ -308,7 +309,7 @@ class CConnman
     void ThreadOpenAddedConnections();
     void AddOneShot(const std::string& strDest);
     void ProcessOneShot();
-    void ThreadOpenConnections();
+    void ThreadOpenConnections(std::vector<std::string> connect);
     void ThreadMessageHandler();
     void AcceptConnection(const ListenSocket& hListenSocket);
     void ThreadSocketHandler();
@@ -385,9 +386,6 @@ class CConnman
     /** Services this instance offers */
     ServiceFlags nLocalServices;
 
-    /** Services this instance cares about */
-    ServiceFlags nRelevantServices;
-
     CSemaphore *semOutbound;
     CSemaphore *semAddnode;
     int nMaxConnections;
@@ -396,6 +394,7 @@ class CConnman
     int nMaxFeeler;
     std::atomic<int> nBestHeight;
     CClientUIInterface* clientInterface;
+    NetEventsInterface* m_msgproc;
 
     /** SipHasher seeds for deterministic randomness */
     const uint64_t nSeed0, nSeed1;
@@ -436,19 +435,18 @@ struct CombinerAll
     }
 };
 
-// Signals for message handling
-struct CNodeSignals
+/**
+ * Interface for message handling
+ */
+class NetEventsInterface
 {
-    boost::signals2::signal<bool (CNode*, CConnman&, std::atomic<bool>&), CombinerAll> ProcessMessages;
-    boost::signals2::signal<bool (CNode*, CConnman&, std::atomic<bool>&), CombinerAll> SendMessages;
-    boost::signals2::signal<void (CNode*, CConnman&)> InitializeNode;
-    boost::signals2::signal<void (NodeId, bool&)> FinalizeNode;
+public:
+    virtual bool ProcessMessages(CNode* pnode, std::atomic<bool>& interrupt) = 0;
+    virtual bool SendMessages(CNode* pnode, std::atomic<bool>& interrupt) = 0;
+    virtual void InitializeNode(CNode* pnode) = 0;
+    virtual void FinalizeNode(NodeId id, bool& update_connection_time) = 0;
 };
 
-
-CNodeSignals& GetNodeSignals();
-
-
 enum
 {
     LOCAL_NONE,   // unknown
@@ -470,7 +468,7 @@ bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
 bool RemoveLocal(const CService& addr);
 bool SeenLocal(const CService& addr);
 bool IsLocal(const CService& addr);
-bool GetLocal(CService &addr, const CNetAddr *paddrPeer = NULL);
+bool GetLocal(CService &addr, const CNetAddr *paddrPeer = nullptr);
 bool IsReachable(enum Network net);
 bool IsReachable(const CNetAddr &addr);
 CAddress GetLocalAddress(const CNetAddr *paddrPeer, ServiceFlags nLocalServices);
@@ -508,7 +506,7 @@ class CNodeStats
     int nVersion;
     std::string cleanSubVer;
     bool fInbound;
-    bool fAddnode;
+    bool m_manual_connection;
     int nStartingHeight;
     uint64_t nSendBytes;
     mapMsgCmdSize mapSendBytesPerMsgCmd;
@@ -580,7 +578,6 @@ class CNode
 public:
     // socket
     std::atomic<ServiceFlags> nServices;
-    ServiceFlags nServicesExpected;
     SOCKET hSocket;
     size_t nSendSize; // total size of all vSendMsg entries
     size_t nSendOffset; // offset inside the first vSendMsg already sent
@@ -618,7 +615,7 @@ class CNode
     bool fWhitelisted; // This peer can bypass DoS banning.
     bool fFeeler; // If true this node is being used as a short lived feeler.
     bool fOneShot;
-    bool fAddnode;
+    bool m_manual_connection;
     bool fClient;
     const bool fInbound;
     std::atomic_bool fSuccessfullyConnected;
@@ -699,13 +696,11 @@ class CNode
 
     CNode(NodeId id, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress &addrIn, uint64_t nKeyedNetGroupIn, uint64_t nLocalHostNonceIn, const CAddress &addrBindIn, const std::string &addrNameIn = "", bool fInboundIn = false);
     ~CNode();
+    CNode(const CNode&) = delete;
+    CNode& operator=(const CNode&) = delete;
 
 private:
-    CNode(const CNode&);
-    void operator=(const CNode&);
     const NodeId id;
-
-
     const uint64_t nLocalHostNonce;
     // Services offered to this peer
     const ServiceFlags nLocalServices;
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 42508a385..807cd5e1b 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -61,6 +61,14 @@ static std::vector<std::pair<uint256, CTransactionRef>> vExtraTxnForCompact GUAR
 
 static const uint64_t RANDOMIZER_ID_ADDRESS_RELAY = 0x3cac0035b5866b90ULL; // SHA256("main address relay")[0:8]
 
+/// Age after which a stale block will no longer be served if requested as
+/// protection against fingerprinting. Set to one month, denominated in seconds.
+static const int STALE_RELAY_AGE_LIMIT = 30 * 24 * 60 * 60;
+
+/// Age after which a block is considered historical for purposes of rate
+/// limiting block relay. Set to one week, denominated in seconds.
+static const int HISTORICAL_BLOCK_AGE = 7 * 24 * 60 * 60;
+
 // Internal stuff
 namespace {
     /** Number of nodes with fSyncStarted. */
@@ -116,6 +124,9 @@ namespace {
     /** Number of peers from which we're downloading blocks. */
     int nPeersWithValidatedDownloads = 0;
 
+    /** Number of outbound peers with m_chain_sync.m_protect. */
+    int g_outbound_peers_with_protect_from_disconnect = 0;
+
     /** Relay map, protected by cs_main. */
     typedef std::map<uint256, CTransactionRef> MapRelay;
     MapRelay mapRelay;
@@ -123,11 +134,6 @@ namespace {
     std::deque<std::pair<int64_t, MapRelay::iterator>> vRelayExpiration;
 } // namespace
 
-//////////////////////////////////////////////////////////////////////////////
-//
-// Registration of network node signals.
-//
-
 namespace {
 
 struct CBlockReject {
@@ -198,14 +204,41 @@ struct CNodeState {
      */
     bool fSupportsDesiredCmpctVersion;
 
+    /** State used to enforce CHAIN_SYNC_TIMEOUT
+      * Only in effect for outbound, non-manual connections, with
+      * m_protect == false
+      * Algorithm: if a peer's best known block has less work than our tip,
+      * set a timeout CHAIN_SYNC_TIMEOUT seconds in the future:
+      *   - If at timeout their best known block now has more work than our tip
+      *     when the timeout was set, then either reset the timeout or clear it
+      *     (after comparing against our current tip's work)
+      *   - If at timeout their best known block still has less work than our
+      *     tip did when the timeout was set, then send a getheaders message,
+      *     and set a shorter timeout, HEADERS_RESPONSE_TIME seconds in future.
+      *     If their best known block is still behind when that new timeout is
+      *     reached, disconnect.
+      */
+    struct ChainSyncTimeoutState {
+        //! A timeout used for checking whether our peer has sufficiently synced
+        int64_t m_timeout;
+        //! A header with the work we require on our peer's chain
+        const CBlockIndex * m_work_header;
+        //! After timeout is reached, set to true after sending getheaders
+        bool m_sent_getheaders;
+        //! Whether this peer is protected from disconnection due to a bad/slow chain
+        bool m_protect;
+    };
+
+    ChainSyncTimeoutState m_chain_sync;
+
     CNodeState(CAddress addrIn, std::string addrNameIn) : address(addrIn), name(addrNameIn) {
         fCurrentlyConnected = false;
         nMisbehavior = 0;
         fShouldBan = false;
-        pindexBestKnownBlock = NULL;
+        pindexBestKnownBlock = nullptr;
         hashLastUnknownBlock.SetNull();
-        pindexLastCommonBlock = NULL;
-        pindexBestHeaderSent = NULL;
+        pindexLastCommonBlock = nullptr;
+        pindexBestHeaderSent = nullptr;
         nUnconnectingHeaders = 0;
         fSyncStarted = false;
         nHeadersSyncTimeout = 0;
@@ -220,6 +253,7 @@ struct CNodeState {
         fHaveWitness = false;
         fWantsCmpctWitness = false;
         fSupportsDesiredCmpctVersion = false;
+        m_chain_sync = { 0, nullptr, false, false };
     }
 };
 
@@ -230,7 +264,7 @@ std::map<NodeId, CNodeState> mapNodeState;
 CNodeState *State(NodeId pnode) {
     std::map<NodeId, CNodeState>::iterator it = mapNodeState.find(pnode);
     if (it == mapNodeState.end())
-        return NULL;
+        return nullptr;
     return &it->second;
 }
 
@@ -244,7 +278,7 @@ void UpdatePreferredDownload(CNode* node, CNodeState* state)
     nPreferredDownload += state->fPreferredDownload;
 }
 
-void PushNodeVersion(CNode *pnode, CConnman& connman, int64_t nTime)
+void PushNodeVersion(CNode *pnode, CConnman* connman, int64_t nTime)
 {
     ServiceFlags nLocalNodeServices = pnode->GetLocalServices();
     uint64_t nonce = pnode->GetLocalNonce();
@@ -255,7 +289,7 @@ void PushNodeVersion(CNode *pnode, CConnman& connman, int64_t nTime)
     CAddress addrYou = (addr.IsRoutable() && !IsProxy(addr) ? addr : CAddress(CService(), addr.nServices));
     CAddress addrMe = CAddress(CService(), nLocalNodeServices);
 
-    connman.PushMessage(pnode, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::VERSION, PROTOCOL_VERSION, (uint64_t)nLocalNodeServices, nTime, addrYou, addrMe,
+    connman->PushMessage(pnode, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::VERSION, PROTOCOL_VERSION, (uint64_t)nLocalNodeServices, nTime, addrYou, addrMe,
             nonce, strSubVersion, nNodeStartingHeight, ::fRelayTxes));
 
     if (fLogIPs) {
@@ -265,49 +299,6 @@ void PushNodeVersion(CNode *pnode, CConnman& connman, int64_t nTime)
     }
 }
 
-void InitializeNode(CNode *pnode, CConnman& connman) {
-    CAddress addr = pnode->addr;
-    std::string addrName = pnode->GetAddrName();
-    NodeId nodeid = pnode->GetId();
-    {
-        LOCK(cs_main);
-        mapNodeState.emplace_hint(mapNodeState.end(), std::piecewise_construct, std::forward_as_tuple(nodeid), std::forward_as_tuple(addr, std::move(addrName)));
-    }
-    if(!pnode->fInbound)
-        PushNodeVersion(pnode, connman, GetTime());
-}
-
-void FinalizeNode(NodeId nodeid, bool& fUpdateConnectionTime) {
-    fUpdateConnectionTime = false;
-    LOCK(cs_main);
-    CNodeState *state = State(nodeid);
-
-    if (state->fSyncStarted)
-        nSyncStarted--;
-
-    if (state->nMisbehavior == 0 && state->fCurrentlyConnected) {
-        fUpdateConnectionTime = true;
-    }
-
-    for (const QueuedBlock& entry : state->vBlocksInFlight) {
-        mapBlocksInFlight.erase(entry.hash);
-    }
-    EraseOrphansFor(nodeid);
-    nPreferredDownload -= state->fPreferredDownload;
-    nPeersWithValidatedDownloads -= (state->nBlocksInFlightValidHeaders != 0);
-    assert(nPeersWithValidatedDownloads >= 0);
-
-    mapNodeState.erase(nodeid);
-
-    if (mapNodeState.empty()) {
-        // Do a consistency check after the last peer is removed.
-        assert(mapBlocksInFlight.empty());
-        assert(nPreferredDownload == 0);
-        assert(nPeersWithValidatedDownloads == 0);
-    }
-    LogPrint(BCLog::NET, "Cleared nodestate for peer=%d\n", nodeid);
-}
-
 // Requires cs_main.
 // Returns a bool indicating whether we requested this block.
 // Also used if a block was /not/ received and timed out or started with another peer
@@ -315,6 +306,7 @@ bool MarkBlockAsReceived(const uint256& hash) {
     std::map<uint256, std::pair<NodeId, std::list<QueuedBlock>::iterator> >::iterator itInFlight = mapBlocksInFlight.find(hash);
     if (itInFlight != mapBlocksInFlight.end()) {
         CNodeState *state = State(itInFlight->second.first);
+        assert(state != nullptr);
         state->nBlocksInFlightValidHeaders -= itInFlight->second.second->fValidatedHeaders;
         if (state->nBlocksInFlightValidHeaders == 0 && itInFlight->second.second->fValidatedHeaders) {
             // Last validated block on the queue was received.
@@ -336,9 +328,9 @@ bool MarkBlockAsReceived(const uint256& hash) {
 // Requires cs_main.
 // returns false, still setting pit, if the block was already in flight from the same peer
 // pit will only be valid as long as the same cs_main lock is being held
-bool MarkBlockAsInFlight(NodeId nodeid, const uint256& hash, const CBlockIndex* pindex = NULL, std::list<QueuedBlock>::iterator** pit = NULL) {
+bool MarkBlockAsInFlight(NodeId nodeid, const uint256& hash, const CBlockIndex* pindex = nullptr, std::list<QueuedBlock>::iterator** pit = nullptr) {
     CNodeState *state = State(nodeid);
-    assert(state != NULL);
+    assert(state != nullptr);
 
     // Short-circuit most stuff in case its from the same node
     std::map<uint256, std::pair<NodeId, std::list<QueuedBlock>::iterator> >::iterator itInFlight = mapBlocksInFlight.find(hash);
@@ -353,14 +345,14 @@ bool MarkBlockAsInFlight(NodeId nodeid, const uint256& hash, const CBlockIndex*
     MarkBlockAsReceived(hash);
 
     std::list<QueuedBlock>::iterator it = state->vBlocksInFlight.insert(state->vBlocksInFlight.end(),
-            {hash, pindex, pindex != NULL, std::unique_ptr<PartiallyDownloadedBlock>(pit ? new PartiallyDownloadedBlock(&mempool) : NULL)});
+            {hash, pindex, pindex != nullptr, std::unique_ptr<PartiallyDownloadedBlock>(pit ? new PartiallyDownloadedBlock(&mempool) : nullptr)});
     state->nBlocksInFlight++;
     state->nBlocksInFlightValidHeaders += it->fValidatedHeaders;
     if (state->nBlocksInFlight == 1) {
         // We're starting a block download (batch) from this peer.
         state->nDownloadingSince = GetTimeMicros();
     }
-    if (state->nBlocksInFlightValidHeaders == 1 && pindex != NULL) {
+    if (state->nBlocksInFlightValidHeaders == 1 && pindex != nullptr) {
         nPeersWithValidatedDownloads++;
     }
     itInFlight = mapBlocksInFlight.insert(std::make_pair(hash, std::make_pair(nodeid, it))).first;
@@ -372,12 +364,12 @@ bool MarkBlockAsInFlight(NodeId nodeid, const uint256& hash, const CBlockIndex*
 /** Check whether the last unknown block a peer advertised is not yet known. */
 void ProcessBlockAvailability(NodeId nodeid) {
     CNodeState *state = State(nodeid);
-    assert(state != NULL);
+    assert(state != nullptr);
 
     if (!state->hashLastUnknownBlock.IsNull()) {
         BlockMap::iterator itOld = mapBlockIndex.find(state->hashLastUnknownBlock);
         if (itOld != mapBlockIndex.end() && itOld->second->nChainWork > 0) {
-            if (state->pindexBestKnownBlock == NULL || itOld->second->nChainWork >= state->pindexBestKnownBlock->nChainWork)
+            if (state->pindexBestKnownBlock == nullptr || itOld->second->nChainWork >= state->pindexBestKnownBlock->nChainWork)
                 state->pindexBestKnownBlock = itOld->second;
             state->hashLastUnknownBlock.SetNull();
         }
@@ -387,14 +379,14 @@ void ProcessBlockAvailability(NodeId nodeid) {
 /** Update tracking information about which blocks a peer is assumed to have. */
 void UpdateBlockAvailability(NodeId nodeid, const uint256 &hash) {
     CNodeState *state = State(nodeid);
-    assert(state != NULL);
+    assert(state != nullptr);
 
     ProcessBlockAvailability(nodeid);
 
     BlockMap::iterator it = mapBlockIndex.find(hash);
     if (it != mapBlockIndex.end() && it->second->nChainWork > 0) {
         // An actually better block was announced.
-        if (state->pindexBestKnownBlock == NULL || it->second->nChainWork >= state->pindexBestKnownBlock->nChainWork)
+        if (state->pindexBestKnownBlock == nullptr || it->second->nChainWork >= state->pindexBestKnownBlock->nChainWork)
             state->pindexBestKnownBlock = it->second;
     } else {
         // An unknown block was announced; just assume that the latest one is the best one.
@@ -402,7 +394,7 @@ void UpdateBlockAvailability(NodeId nodeid, const uint256 &hash) {
     }
 }
 
-void MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid, CConnman& connman) {
+void MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid, CConnman* connman) {
     AssertLockHeld(cs_main);
     CNodeState* nodestate = State(nodeid);
     if (!nodestate || !nodestate->fSupportsDesiredCmpctVersion) {
@@ -417,20 +409,18 @@ void MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid, CConnman& connman) {
                 return;
             }
         }
-        connman.ForNode(nodeid, [&connman](CNode* pfrom){
-            bool fAnnounceUsingCMPCTBLOCK = false;
+        connman->ForNode(nodeid, [connman](CNode* pfrom){
             uint64_t nCMPCTBLOCKVersion = (pfrom->GetLocalServices() & NODE_WITNESS) ? 2 : 1;
             if (lNodesAnnouncingHeaderAndIDs.size() >= 3) {
                 // As per BIP152, we only get 3 of our peers to announce
                 // blocks using compact encodings.
-                connman.ForNode(lNodesAnnouncingHeaderAndIDs.front(), [&connman, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion](CNode* pnodeStop){
-                    connman.PushMessage(pnodeStop, CNetMsgMaker(pnodeStop->GetSendVersion()).Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion));
+                connman->ForNode(lNodesAnnouncingHeaderAndIDs.front(), [connman, nCMPCTBLOCKVersion](CNode* pnodeStop){
+                    connman->PushMessage(pnodeStop, CNetMsgMaker(pnodeStop->GetSendVersion()).Make(NetMsgType::SENDCMPCT, /*fAnnounceUsingCMPCTBLOCK=*/false, nCMPCTBLOCKVersion));
                     return true;
                 });
                 lNodesAnnouncingHeaderAndIDs.pop_front();
             }
-            fAnnounceUsingCMPCTBLOCK = true;
-            connman.PushMessage(pfrom, CNetMsgMaker(pfrom->GetSendVersion()).Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion));
+            connman->PushMessage(pfrom, CNetMsgMaker(pfrom->GetSendVersion()).Make(NetMsgType::SENDCMPCT, /*fAnnounceUsingCMPCTBLOCK=*/true, nCMPCTBLOCKVersion));
             lNodesAnnouncingHeaderAndIDs.push_back(pfrom->GetId());
             return true;
         });
@@ -461,18 +451,18 @@ void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vector<con
 
     vBlocks.reserve(vBlocks.size() + count);
     CNodeState *state = State(nodeid);
-    assert(state != NULL);
+    assert(state != nullptr);
 
     // Make sure pindexBestKnownBlock is up to date, we'll need it.
     ProcessBlockAvailability(nodeid);
 
-    if (state->pindexBestKnownBlock == NULL || state->pindexBestKnownBlock->nChainWork < chainActive.Tip()->nChainWork || state->pindexBestKnownBlock->nChainWork < UintToArith256(consensusParams.nMinimumChainWork)) {
+    if (state->pindexBestKnownBlock == nullptr || state->pindexBestKnownBlock->nChainWork < chainActive.Tip()->nChainWork || state->pindexBestKnownBlock->nChainWork < nMinimumChainWork) {
         // This peer has nothing interesting.
         //printf("nothing interesting best.%p\n",state->pindexBestKnownBlock);
         return;
     }
 
-    if (state->pindexLastCommonBlock == NULL) {
+    if (state->pindexLastCommonBlock == nullptr) {
         // Bootstrap quickly by guessing a parent of our best tip is the forking point.
         // Guessing wrong in either direction is not a problem.
         state->pindexLastCommonBlock = chainActive[std::min(state->pindexBestKnownBlock->nHeight, chainActive.Height())];
@@ -544,10 +534,64 @@ void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vector<con
 
 } // namespace
 
+// Returns true for outbound peers, excluding manual connections, feelers, and
+// one-shots
+bool IsOutboundDisconnectionCandidate(const CNode *node)
+{
+    return !(node->fInbound || node->m_manual_connection || node->fFeeler || node->fOneShot);
+}
+
+void PeerLogicValidation::InitializeNode(CNode *pnode) {
+    CAddress addr = pnode->addr;
+    std::string addrName = pnode->GetAddrName();
+    NodeId nodeid = pnode->GetId();
+    {
+        LOCK(cs_main);
+        mapNodeState.emplace_hint(mapNodeState.end(), std::piecewise_construct, std::forward_as_tuple(nodeid), std::forward_as_tuple(addr, std::move(addrName)));
+    }
+    if(!pnode->fInbound)
+        PushNodeVersion(pnode, connman, GetTime());
+}
+
+void PeerLogicValidation::FinalizeNode(NodeId nodeid, bool& fUpdateConnectionTime) {
+    fUpdateConnectionTime = false;
+    LOCK(cs_main);
+    CNodeState *state = State(nodeid);
+    assert(state != nullptr);
+
+    if (state->fSyncStarted)
+        nSyncStarted--;
+
+    if (state->nMisbehavior == 0 && state->fCurrentlyConnected) {
+        fUpdateConnectionTime = true;
+    }
+
+    for (const QueuedBlock& entry : state->vBlocksInFlight) {
+        mapBlocksInFlight.erase(entry.hash);
+    }
+    EraseOrphansFor(nodeid);
+    nPreferredDownload -= state->fPreferredDownload;
+    nPeersWithValidatedDownloads -= (state->nBlocksInFlightValidHeaders != 0);
+    assert(nPeersWithValidatedDownloads >= 0);
+    g_outbound_peers_with_protect_from_disconnect -= state->m_chain_sync.m_protect;
+    assert(g_outbound_peers_with_protect_from_disconnect >= 0);
+
+    mapNodeState.erase(nodeid);
+
+    if (mapNodeState.empty()) {
+        // Do a consistency check after the last peer is removed.
+        assert(mapBlocksInFlight.empty());
+        assert(nPreferredDownload == 0);
+        assert(nPeersWithValidatedDownloads == 0);
+        assert(g_outbound_peers_with_protect_from_disconnect == 0);
+    }
+    LogPrint(BCLog::NET, "Cleared nodestate for peer=%d\n", nodeid);
+}
+
 bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats) {
     LOCK(cs_main);
     CNodeState *state = State(nodeid);
-    if (state == NULL)
+    if (state == nullptr)
         return false;
     stats.nMisbehavior = state->nMisbehavior;
     stats.nSyncHeight = state->pindexBestKnownBlock ? state->pindexBestKnownBlock->nHeight : -1;
@@ -559,22 +603,6 @@ bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats) {
     return true;
 }
 
-void RegisterNodeSignals(CNodeSignals& nodeSignals)
-{
-    nodeSignals.ProcessMessages.connect(&ProcessMessages);
-    nodeSignals.SendMessages.connect(&SendMessages);
-    nodeSignals.InitializeNode.connect(&InitializeNode);
-    nodeSignals.FinalizeNode.connect(&FinalizeNode);
-}
-
-void UnregisterNodeSignals(CNodeSignals& nodeSignals)
-{
-    nodeSignals.ProcessMessages.disconnect(&ProcessMessages);
-    nodeSignals.SendMessages.disconnect(&SendMessages);
-    nodeSignals.InitializeNode.disconnect(&InitializeNode);
-    nodeSignals.FinalizeNode.disconnect(&FinalizeNode);
-}
-
 //////////////////////////////////////////////////////////////////////////////
 //
 // mapOrphanTransactions
@@ -582,7 +610,7 @@ void UnregisterNodeSignals(CNodeSignals& nodeSignals)
 
 void AddToCompactExtraTransactions(const CTransactionRef& tx)
 {
-    size_t max_extra_txn = GetArg("-blockreconstructionextratxn", DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN);
+    size_t max_extra_txn = gArgs.GetArg("-blockreconstructionextratxn", DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN);
     if (max_extra_txn <= 0)
         return;
     if (!vExtraTxnForCompact.size())
@@ -701,11 +729,11 @@ void Misbehaving(NodeId pnode, int howmuch)
         return;
 
     CNodeState *state = State(pnode);
-    if (state == NULL)
+    if (state == nullptr)
         return;
 
     state->nMisbehavior += howmuch;
-    int banscore = GetArg("-banscore", DEFAULT_BANSCORE_THRESHOLD);
+    int banscore = gArgs.GetArg("-banscore", DEFAULT_BANSCORE_THRESHOLD);
     if (state->nMisbehavior >= banscore && state->nMisbehavior - howmuch < banscore)
     {
         LogPrintf("%s: %s peer=%d (%d -> %d) BAN THRESHOLD EXCEEDED\n", __func__, state->name, pnode, state->nMisbehavior-howmuch, state->nMisbehavior);
@@ -726,6 +754,17 @@ void Misbehaving(NodeId pnode, int howmuch)
 // blockchain -> download logic notification
 //
 
+// To prevent fingerprinting attacks, only send blocks/headers outside of the
+// active chain if they are no more than a month older (both in time, and in
+// best equivalent proof of work) than the best header chain we know about.
+static bool StaleBlockRequestAllowed(const CBlockIndex* pindex, const Consensus::Params& consensusParams)
+{
+    AssertLockHeld(cs_main);
+    return (pindexBestHeader != nullptr) &&
+        (pindexBestHeader->GetBlockTime() - pindex->GetBlockTime() < STALE_RELAY_AGE_LIMIT) &&
+        (GetBlockProofEquivalentTime(*pindexBestHeader, *pindex, *pindexBestHeader, consensusParams) < STALE_RELAY_AGE_LIMIT);
+}
+
 PeerLogicValidation::PeerLogicValidation(CConnman* connmanIn) : connman(connmanIn) {
     // Initialize global variables that cannot be constructed at startup.
     recentRejects.reset(new CRollingBloomFilter(120000, 0.000001));
@@ -866,7 +905,7 @@ void PeerLogicValidation::BlockChecked(const CBlock& block, const CValidationSta
              !IsInitialBlockDownload() &&
              mapBlocksInFlight.count(hash) == mapBlocksInFlight.size()) {
         if (it != mapBlockSource.end()) {
-            MaybeSetPeerAsAnnouncingHeaderAndIDs(it->second.first, *connman);
+            MaybeSetPeerAsAnnouncingHeaderAndIDs(it->second.first, connman);
         }
     }
     if (it != mapBlockSource.end())
@@ -911,16 +950,16 @@ bool static AlreadyHave(const CInv& inv) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
     return true;
 }
 
-static void RelayTransaction(const CTransaction& tx, CConnman& connman)
+static void RelayTransaction(const CTransaction& tx, CConnman* connman)
 {
     CInv inv(MSG_TX, tx.GetHash());
-    connman.ForEachNode([&inv](CNode* pnode)
+    connman->ForEachNode([&inv](CNode* pnode)
     {
         pnode->PushInventory(inv);
     });
 }
 
-static void RelayAddress(const CAddress& addr, bool fReachable, CConnman& connman)
+static void RelayAddress(const CAddress& addr, bool fReachable, CConnman* connman)
 {
     unsigned int nRelayNodes = fReachable ? 2 : 1; // limited relaying of addresses outside our network(s)
 
@@ -928,7 +967,7 @@ static void RelayAddress(const CAddress& addr, bool fReachable, CConnman& connma
     // Use deterministic randomness to send to the same nodes for 24 hours
     // at a time so the addrKnowns of the chosen nodes prevent repeats
     uint64_t hashAddr = addr.GetHash();
-    const CSipHasher hasher = connman.GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY).Write(hashAddr << 32).Write((GetTime() + hashAddr) / (24*60*60));
+    const CSipHasher hasher = connman->GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY).Write(hashAddr << 32).Write((GetTime() + hashAddr) / (24*60*60));
     FastRandomContext insecure_rand;
 
     std::array<std::pair<uint64_t, CNode*>,2> best{{{0, nullptr}, {0, nullptr}}};
@@ -953,10 +992,10 @@ static void RelayAddress(const CAddress& addr, bool fReachable, CConnman& connma
         }
     };
 
-    connman.ForEachNodeThen(std::move(sortfunc), std::move(pushfunc));
+    connman->ForEachNodeThen(std::move(sortfunc), std::move(pushfunc));
 }
 
-void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParams, CConnman& connman, const std::atomic<bool>& interruptMsgProc)
+void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParams, CConnman* connman, const std::atomic<bool>& interruptMsgProc)
 {
     std::deque<CInv>::iterator it = pfrom->vRecvGetData.begin();
     std::vector<CInv> vNotFound;
@@ -1003,13 +1042,8 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
                     if (chainActive.Contains(mi->second)) {
                         send = true;
                     } else {
-                        static const int nOneMonth = 30 * 24 * 60 * 60;
-                        // To prevent fingerprinting attacks, only send blocks outside of the active
-                        // chain if they are valid, and no more than a month older (both in time, and in
-                        // best equivalent proof of work) than the best header chain we know about.
-                        send = mi->second->IsValid(BLOCK_VALID_SCRIPTS) && (pindexBestHeader != NULL) &&
-                            (pindexBestHeader->GetBlockTime() - mi->second->GetBlockTime() < nOneMonth) &&
-                            (GetBlockProofEquivalentTime(*pindexBestHeader, *mi->second, *pindexBestHeader, consensusParams) < nOneMonth);
+                        send = mi->second->IsValid(BLOCK_VALID_SCRIPTS) &&
+                            StaleBlockRequestAllowed(mi->second, consensusParams);
                         if (!send) {
                             LogPrintf("%s: ignoring request from peer=%i for old block that isn't in the main chain\n", __func__, pfrom->GetId());
                         }
@@ -1017,8 +1051,7 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
                 }
                 // disconnect node in case we have reached the outbound limit for serving historical blocks
                 // never disconnect whitelisted nodes
-                static const int nOneWeek = 7 * 24 * 60 * 60; // assume > 1 week = historical
-                if (send && connman.OutboundTargetReached(true) && ( ((pindexBestHeader != NULL) && (pindexBestHeader->GetBlockTime() - mi->second->GetBlockTime() > nOneWeek)) || inv.type == MSG_FILTERED_BLOCK) && !pfrom->fWhitelisted)
+                if (send && connman->OutboundTargetReached(true) && ( ((pindexBestHeader != nullptr) && (pindexBestHeader->GetBlockTime() - mi->second->GetBlockTime() > HISTORICAL_BLOCK_AGE)) || inv.type == MSG_FILTERED_BLOCK) && !pfrom->fWhitelisted)
                 {
                     LogPrint(BCLog::NET, "historical block serving limit reached, disconnect peer=%d\n", pfrom->GetId());
 
@@ -1041,9 +1074,9 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
                         pblock = pblockRead;
                     }
                     if (inv.type == MSG_BLOCK)
-                        connman.PushMessage(pfrom, msgMaker.Make(SERIALIZE_TRANSACTION_NO_WITNESS, NetMsgType::BLOCK, *pblock));
+                        connman->PushMessage(pfrom, msgMaker.Make(SERIALIZE_TRANSACTION_NO_WITNESS, NetMsgType::BLOCK, *pblock));
                     else if (inv.type == MSG_WITNESS_BLOCK)
-                        connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::BLOCK, *pblock));
+                        connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::BLOCK, *pblock));
                     else if (inv.type == MSG_FILTERED_BLOCK)
                     {
                         bool sendMerkleBlock = false;
@@ -1056,7 +1089,7 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
                             }
                         }
                         if (sendMerkleBlock) {
-                            connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::MERKLEBLOCK, merkleBlock));
+                            connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::MERKLEBLOCK, merkleBlock));
                             // CMerkleBlock just contains hashes, so also push any transactions in the block the client did not see
                             // This avoids hurting performance by pointlessly requiring a round-trip
                             // Note that there is currently no way for a node to request any single transactions we didn't send here -
@@ -1065,7 +1098,7 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
                             // however we MUST always provide at least what the remote peer needs
                             typedef std::pair<unsigned int, uint256> PairType;
                             for (PairType& pair : merkleBlock.vMatchedTxn)
-                                connman.PushMessage(pfrom, msgMaker.Make(SERIALIZE_TRANSACTION_NO_WITNESS, NetMsgType::TX, *pblock->vtx[pair.first]));
+                                connman->PushMessage(pfrom, msgMaker.Make(SERIALIZE_TRANSACTION_NO_WITNESS, NetMsgType::TX, *pblock->vtx[pair.first]));
                         }
                         // else
                             // no response
@@ -1080,13 +1113,13 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
                         int nSendFlags = fPeerWantsWitness ? 0 : SERIALIZE_TRANSACTION_NO_WITNESS;
                         if (CanDirectFetch(consensusParams) && mi->second->nHeight >= chainActive.Height() - MAX_CMPCTBLOCK_DEPTH) {
                             if ((fPeerWantsWitness || !fWitnessesPresentInARecentCompactBlock) && a_recent_compact_block && a_recent_compact_block->header.GetHash() == mi->second->GetBlockHash()) {
-                                connman.PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, *a_recent_compact_block));
+                                connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, *a_recent_compact_block));
                             } else {
                                 CBlockHeaderAndShortTxIDs cmpctblock(*pblock, fPeerWantsWitness);
-                                connman.PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock));
+                                connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock));
                             }
                         } else {
-                            connman.PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::BLOCK, *pblock));
+                            connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::BLOCK, *pblock));
                         }
                     }
 
@@ -1098,7 +1131,7 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
                         // wait for other stuff first.
                         std::vector<CInv> vInv;
                         vInv.push_back(CInv(MSG_BLOCK, chainActive.Tip()->GetBlockHash()));
-                        connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::INV, vInv));
+                        connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::INV, vInv));
                         pfrom->hashContinue.SetNull();
                     }
                 }
@@ -1110,14 +1143,14 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
                 auto mi = mapRelay.find(inv.hash);
                 int nSendFlags = (inv.type == MSG_TX ? SERIALIZE_TRANSACTION_NO_WITNESS : 0);
                 if (mi != mapRelay.end()) {
-                    connman.PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::TX, *mi->second));
+                    connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::TX, *mi->second));
                     push = true;
                 } else if (pfrom->timeLastMempoolReq) {
                     auto txinfo = mempool.info(inv.hash);
                     // To protect privacy, do not answer getdata using the mempool when
                     // that TX couldn't have been INVed in reply to a MEMPOOL request.
                     if (txinfo.tx && txinfo.nTime <= pfrom->timeLastMempoolReq) {
-                        connman.PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::TX, *txinfo.tx));
+                        connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::TX, *txinfo.tx));
                         push = true;
                     }
                 }
@@ -1144,7 +1177,7 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
         // do that because they want to know about (and store and rebroadcast and
         // risk analyze) the dependencies of transactions relevant to them, without
         // having to download the entire memory pool.
-        connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::NOTFOUND, vNotFound));
+        connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::NOTFOUND, vNotFound));
     }
 }
 
@@ -1156,7 +1189,7 @@ uint32_t GetFetchFlags(CNode* pfrom) {
     return nFetchFlags;
 }
 
-inline void static SendBlockTransactions(const CBlock& block, const BlockTransactionsRequest& req, CNode* pfrom, CConnman& connman) {
+inline void static SendBlockTransactions(const CBlock& block, const BlockTransactionsRequest& req, CNode* pfrom, CConnman* connman) {
     BlockTransactions resp(req);
     for (size_t i = 0; i < req.indexes.size(); i++) {
         if (req.indexes[i] >= block.vtx.size()) {
@@ -1170,13 +1203,220 @@ inline void static SendBlockTransactions(const CBlock& block, const BlockTransac
     LOCK(cs_main);
     const CNetMsgMaker msgMaker(pfrom->GetSendVersion());
     int nSendFlags = State(pfrom->GetId())->fWantsCmpctWitness ? 0 : SERIALIZE_TRANSACTION_NO_WITNESS;
-    connman.PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::BLOCKTXN, resp));
+    connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::BLOCKTXN, resp));
+}
+
+bool static ProcessHeadersMessage(CNode *pfrom, CConnman *connman, const std::vector<CBlockHeader>& headers, const CChainParams& chainparams, bool punish_duplicate_invalid)
+{
+    const CNetMsgMaker msgMaker(pfrom->GetSendVersion());
+    size_t nCount = headers.size();
+
+    if (nCount == 0) {
+        // Nothing interesting. Stop asking this peers for more headers.
+        return true;
+    }
+
+    const CBlockIndex *pindexLast = nullptr;
+    {
+        LOCK(cs_main);
+        CNodeState *nodestate = State(pfrom->GetId());
+
+        // If this looks like it could be a block announcement (nCount <
+        // MAX_BLOCKS_TO_ANNOUNCE), use special logic for handling headers that
+        // don't connect:
+        // - Send a getheaders message in response to try to connect the chain.
+        // - The peer can send up to MAX_UNCONNECTING_HEADERS in a row that
+        //   don't connect before giving DoS points
+        // - Once a headers message is received that is valid and does connect,
+        //   nUnconnectingHeaders gets reset back to 0.
+        if (mapBlockIndex.find(headers[0].hashPrevBlock) == mapBlockIndex.end() && nCount < MAX_BLOCKS_TO_ANNOUNCE) {
+            nodestate->nUnconnectingHeaders++;
+            connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), uint256()));
+            LogPrint(BCLog::NET, "received header %s: missing prev block %s, sending getheaders (%d) to end (peer=%d, nUnconnectingHeaders=%d)\n",
+                    headers[0].GetHash().ToString(),
+                    headers[0].hashPrevBlock.ToString(),
+                    pindexBestHeader->nHeight,
+                    pfrom->GetId(), nodestate->nUnconnectingHeaders);
+            // Set hashLastUnknownBlock for this peer, so that if we
+            // eventually get the headers - even from a different peer -
+            // we can use this peer to download.
+            UpdateBlockAvailability(pfrom->GetId(), headers.back().GetHash());
+
+            if (nodestate->nUnconnectingHeaders % MAX_UNCONNECTING_HEADERS == 0) {
+                Misbehaving(pfrom->GetId(), 20);
+            }
+            return true;
+        }
+
+        uint256 hashLastBlock;
+        for (const CBlockHeader& header : headers) {
+            if (!hashLastBlock.IsNull() && header.hashPrevBlock != hashLastBlock) {
+                Misbehaving(pfrom->GetId(), 20);
+                return error("non-continuous headers sequence");
+            }
+            hashLastBlock = header.GetHash();
+        }
+    }
+
+    CValidationState state;
+    CBlockHeader first_invalid_header;
+    if (!ProcessNewBlockHeaders(headers, state, chainparams, &pindexLast, &first_invalid_header)) {
+        int nDoS;
+        if (state.IsInvalid(nDoS)) {
+            if (nDoS > 0) {
+                LOCK(cs_main);
+                Misbehaving(pfrom->GetId(), nDoS);
+            }
+            if (punish_duplicate_invalid && mapBlockIndex.find(first_invalid_header.GetHash()) != mapBlockIndex.end()) {
+                // Goal: don't allow outbound peers to use up our outbound
+                // connection slots if they are on incompatible chains.
+                //
+                // We ask the caller to set punish_invalid appropriately based
+                // on the peer and the method of header delivery (compact
+                // blocks are allowed to be invalid in some circumstances,
+                // under BIP 152).
+                // Here, we try to detect the narrow situation that we have a
+                // valid block header (ie it was valid at the time the header
+                // was received, and hence stored in mapBlockIndex) but know the
+                // block is invalid, and that a peer has announced that same
+                // block as being on its active chain.
+                // Disconnect the peer in such a situation.
+                //
+                // Note: if the header that is invalid was not accepted to our
+                // mapBlockIndex at all, that may also be grounds for
+                // disconnecting the peer, as the chain they are on is likely
+                // to be incompatible. However, there is a circumstance where
+                // that does not hold: if the header's timestamp is more than
+                // 2 hours ahead of our current time. In that case, the header
+                // may become valid in the future, and we don't want to
+                // disconnect a peer merely for serving us one too-far-ahead
+                // block header, to prevent an attacker from splitting the
+                // network by mining a block right at the 2 hour boundary.
+                //
+                // TODO: update the DoS logic (or, rather, rewrite the
+                // DoS-interface between validation and net_processing) so that
+                // the interface is cleaner, and so that we disconnect on all the
+                // reasons that a peer's headers chain is incompatible
+                // with ours (eg block->nVersion softforks, MTP violations,
+                // etc), and not just the duplicate-invalid case.
+                pfrom->fDisconnect = true;
+            }
+            return error("invalid header received");
+        }
+    }
+
+    {
+        LOCK(cs_main);
+        CNodeState *nodestate = State(pfrom->GetId());
+        if (nodestate->nUnconnectingHeaders > 0) {
+            LogPrint(BCLog::NET, "peer=%d: resetting nUnconnectingHeaders (%d -> 0)\n", pfrom->GetId(), nodestate->nUnconnectingHeaders);
+        }
+        nodestate->nUnconnectingHeaders = 0;
+
+        assert(pindexLast);
+        UpdateBlockAvailability(pfrom->GetId(), pindexLast->GetBlockHash());
+
+        // From here, pindexBestKnownBlock should be guaranteed to be non-null,
+        // because it is set in UpdateBlockAvailability. Some nullptr checks
+        // are still present, however, as belt-and-suspenders.
+
+        if (nCount == MAX_HEADERS_RESULTS) {
+            // Headers message had its maximum size; the peer may have more headers.
+            // TODO: optimize: if pindexLast is an ancestor of chainActive.Tip or pindexBestHeader, continue
+            // from there instead.
+            LogPrint(BCLog::NET, "more getheaders (%d) to end to peer=%d (startheight:%d)\n", pindexLast->nHeight, pfrom->GetId(), pfrom->nStartingHeight);
+            connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexLast), uint256()));
+        }
+
+        bool fCanDirectFetch = CanDirectFetch(chainparams.GetConsensus());
+        // If this set of headers is valid and ends in a block with at least as
+        // much work as our tip, download as much as possible.
+        if (fCanDirectFetch && pindexLast->IsValid(BLOCK_VALID_TREE) && chainActive.Tip()->nChainWork <= pindexLast->nChainWork) {
+            std::vector<const CBlockIndex*> vToFetch;
+            const CBlockIndex *pindexWalk = pindexLast;
+            // Calculate all the blocks we'd need to switch to pindexLast, up to a limit.
+            while (pindexWalk && !chainActive.Contains(pindexWalk) && vToFetch.size() <= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
+                if (!(pindexWalk->nStatus & BLOCK_HAVE_DATA) &&
+                        !mapBlocksInFlight.count(pindexWalk->GetBlockHash()) &&
+                        (!IsWitnessEnabled(pindexWalk->pprev, chainparams.GetConsensus()) || State(pfrom->GetId())->fHaveWitness)) {
+                    // We don't have this block, and it's not yet in flight.
+                    vToFetch.push_back(pindexWalk);
+                }
+                pindexWalk = pindexWalk->pprev;
+            }
+            // If pindexWalk still isn't on our main chain, we're looking at a
+            // very large reorg at a time we think we're close to caught up to
+            // the main chain -- this shouldn't really happen.  Bail out on the
+            // direct fetch and rely on parallel download instead.
+            if (!chainActive.Contains(pindexWalk)) {
+                LogPrint(BCLog::NET, "Large reorg, won't direct fetch to %s (%d)\n",
+                        pindexLast->GetBlockHash().ToString(),
+                        pindexLast->nHeight);
+            } else {
+                std::vector<CInv> vGetData;
+                // Download as much as possible, from earliest to latest.
+                for (const CBlockIndex *pindex : reverse_iterate(vToFetch)) {
+                    if (nodestate->nBlocksInFlight >= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
+                        // Can't download any more from this peer
+                        break;
+                    }
+                    uint32_t nFetchFlags = GetFetchFlags(pfrom);
+                    vGetData.push_back(CInv(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash()));
+                    MarkBlockAsInFlight(pfrom->GetId(), pindex->GetBlockHash(), pindex);
+                    LogPrint(BCLog::NET, "Requesting block %s from  peer=%d\n",
+                            pindex->GetBlockHash().ToString(), pfrom->GetId());
+                }
+                if (vGetData.size() > 1) {
+                    LogPrint(BCLog::NET, "Downloading blocks toward %s (%d) via headers direct fetch\n",
+                            pindexLast->GetBlockHash().ToString(), pindexLast->nHeight);
+                }
+                if (vGetData.size() > 0) {
+                    if (nodestate->fSupportsDesiredCmpctVersion && vGetData.size() == 1 && mapBlocksInFlight.size() == 1 && pindexLast->pprev->IsValid(BLOCK_VALID_CHAIN)) {
+                        // In any case, we want to download using a compact block, not a regular one
+                        vGetData[0] = CInv(MSG_CMPCT_BLOCK, vGetData[0].hash);
+                    }
+                    connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vGetData));
+                }
+            }
+        }
+        // If we're in IBD, we want outbound peers that will serve us a useful
+        // chain. Disconnect peers that are on chains with insufficient work.
+        if (IsInitialBlockDownload() && nCount != MAX_HEADERS_RESULTS) {
+            // When nCount < MAX_HEADERS_RESULTS, we know we have no more
+            // headers to fetch from this peer.
+            if (nodestate->pindexBestKnownBlock && nodestate->pindexBestKnownBlock->nChainWork < nMinimumChainWork) {
+                // This peer has too little work on their headers chain to help
+                // us sync -- disconnect if using an outbound slot (unless
+                // whitelisted or addnode).
+                // Note: We compare their tip to nMinimumChainWork (rather than
+                // chainActive.Tip()) because we won't start block download
+                // until we have a headers chain that has at least
+                // nMinimumChainWork, even if a peer has a chain past our tip,
+                // as an anti-DoS measure.
+                if (IsOutboundDisconnectionCandidate(pfrom)) {
+                    LogPrintf("Disconnecting outbound peer %d -- headers chain has insufficient work\n", pfrom->GetId());
+                    pfrom->fDisconnect = true;
+                }
+            }
+        }
+
+        if (!pfrom->fDisconnect && IsOutboundDisconnectionCandidate(pfrom) && nodestate->pindexBestKnownBlock != nullptr) {
+            // If this is an outbound peer, check to see if we should protect
+            // it from the bad/lagging chain logic.
+            if (g_outbound_peers_with_protect_from_disconnect < MAX_OUTBOUND_PEERS_TO_PROTECT_FROM_DISCONNECT && nodestate->pindexBestKnownBlock->nChainWork >= chainActive.Tip()->nChainWork && !nodestate->m_chain_sync.m_protect) {
+                nodestate->m_chain_sync.m_protect = true;
+                ++g_outbound_peers_with_protect_from_disconnect;
+            }
+        }
+    }
+
+    return true;
 }
 
-bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStream& vRecv, int64_t nTimeReceived, const CChainParams& chainparams, CConnman& connman, const std::atomic<bool>& interruptMsgProc)
+bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStream& vRecv, int64_t nTimeReceived, const CChainParams& chainparams, CConnman* connman, const std::atomic<bool>& interruptMsgProc)
 {
     LogPrint(BCLog::NET, "received: %s (%u bytes) peer=%d\n", SanitizeString(strCommand), vRecv.size(), pfrom->GetId());
-    if (IsArgSet("-dropmessagestest") && GetRand(GetArg("-dropmessagestest", 0)) == 0)
+    if (gArgs.IsArgSet("-dropmessagestest") && GetRand(gArgs.GetArg("-dropmessagestest", 0)) == 0)
     {
         LogPrintf("dropmessagestest DROPPING RECV MESSAGE\n");
         return true;
@@ -1226,7 +1466,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         // Each connection can only send one version message
         if (pfrom->nVersion != 0)
         {
-            connman.PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, strCommand, REJECT_DUPLICATE, std::string("Duplicate version message")));
+            connman->PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, strCommand, REJECT_DUPLICATE, std::string("Duplicate version message")));
             LOCK(cs_main);
             Misbehaving(pfrom->GetId(), 1);
             return false;
@@ -1250,13 +1490,13 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         nServices = ServiceFlags(nServiceInt);
         if (!pfrom->fInbound)
         {
-            connman.SetServices(pfrom->addr, nServices);
+            connman->SetServices(pfrom->addr, nServices);
         }
-        if (pfrom->nServicesExpected & ~nServices)
+        if (!pfrom->fInbound && !pfrom->fFeeler && !pfrom->m_manual_connection && !HasAllDesirableServiceFlags(nServices))
         {
-            LogPrint(BCLog::NET, "peer=%d does not offer the expected services (%08x offered, %08x expected); disconnecting\n", pfrom->GetId(), nServices, pfrom->nServicesExpected);
-            connman.PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, strCommand, REJECT_NONSTANDARD,
-                               strprintf("Expected to offer services %08x", pfrom->nServicesExpected)));
+            LogPrint(BCLog::NET, "peer=%d does not offer the expected services (%08x offered, %08x expected); disconnecting\n", pfrom->GetId(), nServices, GetDesirableServiceFlags(nServices));
+            connman->PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, strCommand, REJECT_NONSTANDARD,
+                               strprintf("Expected to offer services %08x", GetDesirableServiceFlags(nServices))));
             pfrom->fDisconnect = true;
             return false;
         }
@@ -1276,7 +1516,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         {
             // disconnect from peers older than this proto version
             LogPrintf("peer=%d using obsolete version %i; disconnecting\n", pfrom->GetId(), nVersion);
-            connman.PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, strCommand, REJECT_OBSOLETE,
+            connman->PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, strCommand, REJECT_OBSOLETE,
                                strprintf("Version must be %d or greater", MIN_PEER_PROTO_VERSION)));
             pfrom->fDisconnect = true;
             return false;
@@ -1296,7 +1536,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         if (!vRecv.empty())
             vRecv >> fRelay;
         // Disconnect if we connected to ourself
-        if (pfrom->fInbound && !connman.CheckIncomingNonce(nNonce))
+        if (pfrom->fInbound && !connman->CheckIncomingNonce(nNonce))
         {
             LogPrintf("connected to self at %s, disconnecting\n", pfrom->addr.ToString());
             pfrom->fDisconnect = true;
@@ -1312,7 +1552,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         if (pfrom->fInbound)
             PushNodeVersion(pfrom, connman, GetAdjustedTime());
 
-        connman.PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::VERACK));
+        connman->PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::VERACK));
 
         pfrom->nServices = nServices;
         pfrom->SetAddrLocal(addrMe);
@@ -1363,12 +1603,12 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             }
 
             // Get recent addresses
-            if (pfrom->fOneShot || pfrom->nVersion >= CADDR_TIME_VERSION || connman.GetAddressCount() < 1000)
+            if (pfrom->fOneShot || pfrom->nVersion >= CADDR_TIME_VERSION || connman->GetAddressCount() < 1000)
             {
-                connman.PushMessage(pfrom, CNetMsgMaker(nSendVersion).Make(NetMsgType::GETADDR));
+                connman->PushMessage(pfrom, CNetMsgMaker(nSendVersion).Make(NetMsgType::GETADDR));
                 pfrom->fGetAddr = true;
             }
-            connman.MarkAddressGood(pfrom->addr);
+            connman->MarkAddressGood(pfrom->addr);
         }
 
         std::string remoteAddr;
@@ -1387,7 +1627,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         // If the peer is old enough to have the old alert system, send it the final alert.
         if (pfrom->nVersion <= 70012) {
             CDataStream finalAlert(ParseHex("60010000000000000000000000ffffff7f00000000ffffff7ffeffff7f01ffffff7f00000000ffffff7f00ffffff7f002f555247454e543a20416c657274206b657920636f6d70726f6d697365642c2075706772616465207265717569726564004630440220653febd6410f470f6bae11cad19c48413becb1ac2c17f908fd0fd53bdc3abd5202206d0e9c96fe88d4a0f01ed9dedae2b6f9e00da94cad0fecaae66ecf689bf71b50"), SER_NETWORK, PROTOCOL_VERSION);
-            connman.PushMessage(pfrom, CNetMsgMaker(nSendVersion).Make("alert", finalAlert));
+            connman->PushMessage(pfrom, CNetMsgMaker(nSendVersion).Make("alert", finalAlert));
         }
 
         // Feeler connections exist only to verify if address is online.
@@ -1425,7 +1665,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             // We send this to non-NODE NETWORK peers as well, because even
             // non-NODE NETWORK peers can announce blocks (such as pruning
             // nodes)
-            connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDHEADERS));
+            connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDHEADERS));
         }
         if (pfrom->nVersion >= SHORT_IDS_BLOCKS_VERSION) {
             // Tell our peer we are willing to provide version 1 or 2 cmpctblocks
@@ -1436,9 +1676,9 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             bool fAnnounceUsingCMPCTBLOCK = false;
             uint64_t nCMPCTBLOCKVersion = 2;
             if (pfrom->GetLocalServices() & NODE_WITNESS)
-                connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion));
+                connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion));
             nCMPCTBLOCKVersion = 1;
-            connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion));
+            connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion));
         }
         pfrom->fSuccessfullyConnected = true;
     }
@@ -1457,7 +1697,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         vRecv >> vAddr;
 
         // Don't want addr from older versions unless seeding
-        if (pfrom->nVersion < CADDR_TIME_VERSION && connman.GetAddressCount() > 1000)
+        if (pfrom->nVersion < CADDR_TIME_VERSION && connman->GetAddressCount() > 1000)
             return true;
         if (vAddr.size() > 1000)
         {
@@ -1475,7 +1715,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             if (interruptMsgProc)
                 return true;
 
-            if ((addr.nServices & REQUIRED_SERVICES) != REQUIRED_SERVICES)
+            // We only bother storing full nodes, though this may include
+            // things which we would not make an outbound connection to, in
+            // part because we may make feeler connections to them.
+            if (!MayHaveUsefulAddressDB(addr.nServices))
                 continue;
 
             if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
@@ -1491,7 +1734,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             if (fReachable)
                 vAddrOk.push_back(addr);
         }
-        connman.AddNewAddresses(vAddrOk, pfrom->addr, 2 * 60 * 60);
+        connman->AddNewAddresses(vAddrOk, pfrom->addr, 2 * 60 * 60);
         if (vAddr.size() < 1000)
             pfrom->fGetAddr = false;
         if (pfrom->fOneShot)
@@ -1542,7 +1785,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         bool fBlocksOnly = !fRelayTxes;
 
         // Allow whitelisted peers to send data other than blocks in blocks only mode if whitelistrelay is true
-        if (pfrom->fWhitelisted && GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY))
+        if (pfrom->fWhitelisted && gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY))
             fBlocksOnly = false;
 
         LOCK(cs_main);
@@ -1569,7 +1812,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                     // fell back to inv we probably have a reorg which we should get the headers for first,
                     // we now only provide a getheaders response here. When we receive the headers, we will
                     // then ask for the blocks we need.
-                    connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), inv.hash));
+                    connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), inv.hash));
                     LogPrint(BCLog::NET, "getheaders (%d) %s to peer=%d\n", pindexBestHeader->nHeight, inv.hash.ToString(), pfrom->GetId());
                 }
             }
@@ -1735,7 +1978,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         }
 
         CNodeState *nodestate = State(pfrom->GetId());
-        const CBlockIndex* pindex = NULL;
+        const CBlockIndex* pindex = nullptr;
         if (locator.IsNull())
         {
             // If locator is null, return the hashStop block
@@ -1743,6 +1986,12 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             if (mi == mapBlockIndex.end())
                 return true;
             pindex = (*mi).second;
+
+            if (!chainActive.Contains(pindex) &&
+                !StaleBlockRequestAllowed(pindex, chainparams.GetConsensus())) {
+                LogPrintf("%s: ignoring request from peer=%i for old block header that isn't in the main chain\n", __func__, pfrom->GetId());
+                return true;
+            }
         }
         else
         {
@@ -1762,7 +2011,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
                 break;
         }
-        // pindex can be NULL either if we sent chainActive.Tip() OR
+        // pindex can be nullptr either if we sent chainActive.Tip() OR
         // if our peer has chainActive.Tip() (and thus we are sending an empty
         // headers message). In both cases it's safe to update
         // pindexBestHeaderSent to be our tip.
@@ -1775,7 +2024,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         // will re-announce the new block via headers (or compact blocks again)
         // in the SendMessages logic.
         nodestate->pindexBestHeaderSent = pindex ? pindex : chainActive.Tip();
-        connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::HEADERS, vHeaders));
+        connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::HEADERS, vHeaders));
     }
 
 
@@ -1783,7 +2032,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
     {
         // Stop processing the transaction early if
         // We are in blocks only mode and peer is either not whitelisted or whitelistrelay is off
-        if (!fRelayTxes && (!pfrom->fWhitelisted || !GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY)))
+        if (!fRelayTxes && (!pfrom->fWhitelisted || !gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY)))
         {
             LogPrint(BCLog::NET, "transaction sent in violation of protocol peer=%d\n", pfrom->GetId());
             return true;
@@ -1808,7 +2057,8 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
 
         std::list<CTransactionRef> lRemovedTxn;
 
-        if (!AlreadyHave(inv) && AcceptToMemoryPool(mempool, state, ptx, true, &fMissingInputs, &lRemovedTxn)) {
+        if (!AlreadyHave(inv) &&
+            AcceptToMemoryPool(mempool, state, ptx, &fMissingInputs, &lRemovedTxn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
             mempool.check(pcoinsTip);
             RelayTransaction(tx, connman);
             for (unsigned int i = 0; i < tx.vout.size(); i++) {
@@ -1846,7 +2096,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
 
                     if (setMisbehaving.count(fromPeer))
                         continue;
-                    if (AcceptToMemoryPool(mempool, stateDummy, porphanTx, true, &fMissingInputs2, &lRemovedTxn)) {
+                    if (AcceptToMemoryPool(mempool, stateDummy, porphanTx, &fMissingInputs2, &lRemovedTxn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
                         LogPrint(BCLog::MEMPOOL, "   accepted orphan tx %s\n", orphanHash.ToString());
                         RelayTransaction(orphanTx, connman);
                         for (unsigned int i = 0; i < orphanTx.vout.size(); i++) {
@@ -1902,7 +2152,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                 AddOrphanTx(ptx, pfrom->GetId());
 
                 // DoS prevention: do not allow mapOrphanTransactions to grow unbounded
-                unsigned int nMaxOrphanTx = (unsigned int)std::max((int64_t)0, GetArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS));
+                unsigned int nMaxOrphanTx = (unsigned int)std::max((int64_t)0, gArgs.GetArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS));
                 unsigned int nEvicted = LimitOrphanTxSize(nMaxOrphanTx);
                 if (nEvicted > 0) {
                     LogPrint(BCLog::MEMPOOL, "mapOrphan overflow, removed %u tx\n", nEvicted);
@@ -1927,7 +2177,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                 AddToCompactExtraTransactions(ptx);
             }
 
-            if (pfrom->fWhitelisted && GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) {
+            if (pfrom->fWhitelisted && gArgs.GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) {
                 // Always relay transactions received from whitelisted peers, even
                 // if they were already in the mempool or rejected from it due
                 // to policy, allowing the node to function as a gateway for
@@ -1956,7 +2206,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                 pfrom->GetId(),
                 FormatStateMessage(state));
             if (state.GetRejectCode() > 0 && state.GetRejectCode() < REJECT_INTERNAL) // Never send AcceptToMemoryPool's internal codes over P2P
-                connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::REJECT, strCommand, (unsigned char)state.GetRejectCode(),
+                connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::REJECT, strCommand, (unsigned char)state.GetRejectCode(),
                                    state.GetRejectReason().substr(0, MAX_REJECT_MESSAGE_LENGTH), inv.hash));
             if (nDoS > 0) {
                 Misbehaving(pfrom->GetId(), nDoS);
@@ -1976,12 +2226,12 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         if (mapBlockIndex.find(cmpctblock.header.hashPrevBlock) == mapBlockIndex.end()) {
             // Doesn't connect (or is genesis), instead of DoSing in AcceptBlockHeader, request deeper headers
             if (!IsInitialBlockDownload())
-                connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), uint256()));
+                connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), uint256()));
             return true;
         }
         }
 
-        const CBlockIndex *pindex = NULL;
+        const CBlockIndex *pindex = nullptr;
         CValidationState state;
         if (!ProcessNewBlockHeaders({cmpctblock.header}, state, chainparams, &pindex)) {
             int nDoS;
@@ -2005,7 +2255,6 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         // If we end up treating this as a plain headers message, call that as well
         // without cs_main.
         bool fRevertToHeaderProcessing = false;
-        CDataStream vHeadersMsg(SER_NETWORK, PROTOCOL_VERSION);
 
         // Keep a CBlock for "optimistic" compactblock reconstructions (see
         // below)
@@ -2031,7 +2280,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                 // so we just grab the block via normal getdata
                 std::vector<CInv> vInv(1);
                 vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(pfrom), cmpctblock.header.GetHash());
-                connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv));
+                connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv));
             }
             return true;
         }
@@ -2053,7 +2302,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         if (pindex->nHeight <= chainActive.Height() + 2) {
             if ((!fAlreadyInFlight && nodestate->nBlocksInFlight < MAX_BLOCKS_IN_TRANSIT_PER_PEER) ||
                  (fAlreadyInFlight && blockInFlightIt->second.first == pfrom->GetId())) {
-                std::list<QueuedBlock>::iterator* queuedBlockIt = NULL;
+                std::list<QueuedBlock>::iterator* queuedBlockIt = nullptr;
                 if (!MarkBlockAsInFlight(pfrom->GetId(), pindex->GetBlockHash(), pindex, &queuedBlockIt)) {
                     if (!(*queuedBlockIt)->partialBlock)
                         (*queuedBlockIt)->partialBlock.reset(new PartiallyDownloadedBlock(&mempool));
@@ -2075,7 +2324,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                     // Duplicate txindexes, the block is now in-flight, so just request it
                     std::vector<CInv> vInv(1);
                     vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(pfrom), cmpctblock.header.GetHash());
-                    connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv));
+                    connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv));
                     return true;
                 }
 
@@ -2092,7 +2341,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                     fProcessBLOCKTXN = true;
                 } else {
                     req.blockhash = pindex->GetBlockHash();
-                    connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETBLOCKTXN, req));
+                    connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETBLOCKTXN, req));
                 }
             } else {
                 // This block is either already in flight from a different
@@ -2118,14 +2367,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                 // mempool will probably be useless - request the block normally
                 std::vector<CInv> vInv(1);
                 vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(pfrom), cmpctblock.header.GetHash());
-                connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv));
+                connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv));
                 return true;
             } else {
                 // If this was an announce-cmpctblock, we want the same treatment as a header message
-                // Dirty hack to process as if it were just a headers message (TODO: move message handling into their own functions)
-                std::vector<CBlock> headers;
-                headers.push_back(cmpctblock.header);
-                vHeadersMsg << headers;
                 fRevertToHeaderProcessing = true;
             }
         }
@@ -2134,8 +2379,14 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         if (fProcessBLOCKTXN)
             return ProcessMessage(pfrom, NetMsgType::BLOCKTXN, blockTxnMsg, nTimeReceived, chainparams, connman, interruptMsgProc);
 
-        if (fRevertToHeaderProcessing)
-            return ProcessMessage(pfrom, NetMsgType::HEADERS, vHeadersMsg, nTimeReceived, chainparams, connman, interruptMsgProc);
+        if (fRevertToHeaderProcessing) {
+            // Headers received from HB compact block peers are permitted to be
+            // relayed before full validation (see BIP 152), so we don't want to disconnect
+            // the peer if the header turns out to be for an invalid block.
+            // Note that if a peer tries to build on an invalid chain, that
+            // will be detected and the peer will be banned.
+            return ProcessHeadersMessage(pfrom, connman, {cmpctblock.header}, chainparams, /*punish_duplicate_invalid=*/false);
+        }
 
         if (fBlockReconstructed) {
             // If we got here, we were able to optimistically reconstruct a
@@ -2145,10 +2396,22 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                 mapBlockSource.emplace(pblock->GetHash(), std::make_pair(pfrom->GetId(), false));
             }
             bool fNewBlock = false;
-            ProcessNewBlock(chainparams, pblock, true, &fNewBlock);
-            if (fNewBlock)
+            // Setting fForceProcessing to true means that we bypass some of
+            // our anti-DoS protections in AcceptBlock, which filters
+            // unrequested blocks that might be trying to waste our resources
+            // (eg disk space). Because we only try to reconstruct blocks when
+            // we're close to caught up (via the CanDirectFetch() requirement
+            // above, combined with the behavior of not requesting blocks until
+            // we have a chain with at least nMinimumChainWork), and we ignore
+            // compact blocks with less work than our tip, it is safe to treat
+            // reconstructed compact blocks as having been requested.
+            ProcessNewBlock(chainparams, pblock, /*fForceProcessing=*/true, &fNewBlock);
+            if (fNewBlock) {
                 pfrom->nLastBlockTime = GetTime();
-
+            } else {
+                LOCK(cs_main);
+                mapBlockSource.erase(pblock->GetHash());
+            }
             LOCK(cs_main); // hold cs_main for CBlockIndex::IsValid()
             if (pindex->IsValid(BLOCK_VALID_TRANSACTIONS)) {
                 // Clear download state for this block, which is in
@@ -2189,7 +2452,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                 // Might have collided, fall back to getdata now :(
                 std::vector<CInv> invs;
                 invs.push_back(CInv(MSG_BLOCK | GetFetchFlags(pfrom), resp.blockhash));
-                connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, invs));
+                connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, invs));
             } else {
                 // Block is either okay, or possibly we received
                 // READ_STATUS_CHECKBLOCK_FAILED.
@@ -2222,9 +2485,17 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             bool fNewBlock = false;
             // Since we requested this block (it was in mapBlocksInFlight), force it to be processed,
             // even if it would not be a candidate for new tip (missing previous block, chain not long enough, etc)
-            ProcessNewBlock(chainparams, pblock, true, &fNewBlock);
-            if (fNewBlock)
+            // This bypasses some anti-DoS logic in AcceptBlock (eg to prevent
+            // disk-space attacks), but this should be safe due to the
+            // protections in the compact block handler -- see related comment
+            // in compact block optimistic reconstruction handling.
+            ProcessNewBlock(chainparams, pblock, /*fForceProcessing=*/true, &fNewBlock);
+            if (fNewBlock) {
                 pfrom->nLastBlockTime = GetTime();
+            } else {
+                LOCK(cs_main);
+                mapBlockSource.erase(pblock->GetHash());
+            }
         }
     }
 
@@ -2246,136 +2517,12 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             ReadCompactSize(vRecv); // ignore tx count; assume it is 0.
         }
 
-        if (nCount == 0) {
-            // Nothing interesting. Stop asking this peers for more headers.
-            return true;
-        }
-
-        const CBlockIndex *pindexLast = NULL;
-        {
-        LOCK(cs_main);
-        CNodeState *nodestate = State(pfrom->GetId());
-
-        // If this looks like it could be a block announcement (nCount <
-        // MAX_BLOCKS_TO_ANNOUNCE), use special logic for handling headers that
-        // don't connect:
-        // - Send a getheaders message in response to try to connect the chain.
-        // - The peer can send up to MAX_UNCONNECTING_HEADERS in a row that
-        //   don't connect before giving DoS points
-        // - Once a headers message is received that is valid and does connect,
-        //   nUnconnectingHeaders gets reset back to 0.
-        if (mapBlockIndex.find(headers[0].hashPrevBlock) == mapBlockIndex.end() && nCount < MAX_BLOCKS_TO_ANNOUNCE) {
-            nodestate->nUnconnectingHeaders++;
-            connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), uint256()));
-            LogPrint(BCLog::NET, "received header %s: missing prev block %s, sending getheaders (%d) to end (peer=%d, nUnconnectingHeaders=%d)\n",
-                    headers[0].GetHash().ToString(),
-                    headers[0].hashPrevBlock.ToString(),
-                    pindexBestHeader->nHeight,
-                    pfrom->GetId(), nodestate->nUnconnectingHeaders);
-            // Set hashLastUnknownBlock for this peer, so that if we
-            // eventually get the headers - even from a different peer -
-            // we can use this peer to download.
-            UpdateBlockAvailability(pfrom->GetId(), headers.back().GetHash());
-
-            if (nodestate->nUnconnectingHeaders % MAX_UNCONNECTING_HEADERS == 0) {
-                Misbehaving(pfrom->GetId(), 20);
-            }
-            return true;
-        }
-
-        uint256 hashLastBlock;
-        for (const CBlockHeader& header : headers) {
-            if (!hashLastBlock.IsNull() && header.hashPrevBlock != hashLastBlock) {
-                Misbehaving(pfrom->GetId(), 20);
-                return error("non-continuous headers sequence");
-            }
-            hashLastBlock = header.GetHash();
-        }
-        }
-
-        CValidationState state;
-        if (!ProcessNewBlockHeaders(headers, state, chainparams, &pindexLast)) {
-            int nDoS;
-            if (state.IsInvalid(nDoS)) {
-                if (nDoS > 0) {
-                    LOCK(cs_main);
-                    Misbehaving(pfrom->GetId(), nDoS);
-                }
-                return error("invalid header received");
-            }
-        }
-
-        {
-        LOCK(cs_main);
-        CNodeState *nodestate = State(pfrom->GetId());
-        if (nodestate->nUnconnectingHeaders > 0) {
-            LogPrint(BCLog::NET, "peer=%d: resetting nUnconnectingHeaders (%d -> 0)\n", pfrom->GetId(), nodestate->nUnconnectingHeaders);
-        }
-        nodestate->nUnconnectingHeaders = 0;
-
-        assert(pindexLast);
-        UpdateBlockAvailability(pfrom->GetId(), pindexLast->GetBlockHash());
-
-        if (nCount == MAX_HEADERS_RESULTS) {
-            // Headers message had its maximum size; the peer may have more headers.
-            // TODO: optimize: if pindexLast is an ancestor of chainActive.Tip or pindexBestHeader, continue
-            // from there instead.
-            LogPrint(BCLog::NET, "more getheaders (%d) to end to peer=%d (startheight:%d)\n", pindexLast->nHeight, pfrom->GetId(), pfrom->nStartingHeight);
-            connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexLast), uint256()));
-        }
-
-        bool fCanDirectFetch = CanDirectFetch(chainparams.GetConsensus());
-        // If this set of headers is valid and ends in a block with at least as
-        // much work as our tip, download as much as possible.
-        if (fCanDirectFetch && pindexLast->IsValid(BLOCK_VALID_TREE) && chainActive.Tip()->nChainWork <= pindexLast->nChainWork) {
-            std::vector<const CBlockIndex*> vToFetch;
-            const CBlockIndex *pindexWalk = pindexLast;
-            // Calculate all the blocks we'd need to switch to pindexLast, up to a limit.
-            while (pindexWalk && !chainActive.Contains(pindexWalk) && vToFetch.size() <= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
-                if (!(pindexWalk->nStatus & BLOCK_HAVE_DATA) &&
-                        !mapBlocksInFlight.count(pindexWalk->GetBlockHash()) &&
-                        (!IsWitnessEnabled(pindexWalk->pprev, chainparams.GetConsensus()) || State(pfrom->GetId())->fHaveWitness)) {
-                    // We don't have this block, and it's not yet in flight.
-                    vToFetch.push_back(pindexWalk);
-                }
-                pindexWalk = pindexWalk->pprev;
-            }
-            // If pindexWalk still isn't on our main chain, we're looking at a
-            // very large reorg at a time we think we're close to caught up to
-            // the main chain -- this shouldn't really happen.  Bail out on the
-            // direct fetch and rely on parallel download instead.
-            if (!chainActive.Contains(pindexWalk)) {
-                LogPrint(BCLog::NET, "Large reorg, won't direct fetch to %s (%d)\n",
-                        pindexLast->GetBlockHash().ToString(),
-                        pindexLast->nHeight);
-            } else {
-                std::vector<CInv> vGetData;
-                // Download as much as possible, from earliest to latest.
-                for (const CBlockIndex *pindex : reverse_iterate(vToFetch)) {
-                    if (nodestate->nBlocksInFlight >= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
-                        // Can't download any more from this peer
-                        break;
-                    }
-                    uint32_t nFetchFlags = GetFetchFlags(pfrom);
-                    vGetData.push_back(CInv(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash()));
-                    MarkBlockAsInFlight(pfrom->GetId(), pindex->GetBlockHash(), pindex);
-                    LogPrint(BCLog::NET, "Requesting block %s from  peer=%d\n",
-                            pindex->GetBlockHash().ToString(), pfrom->GetId());
-                }
-                if (vGetData.size() > 1) {
-                    LogPrint(BCLog::NET, "Downloading blocks toward %s (%d) via headers direct fetch\n",
-                            pindexLast->GetBlockHash().ToString(), pindexLast->nHeight);
-                }
-                if (vGetData.size() > 0) {
-                    if (nodestate->fSupportsDesiredCmpctVersion && vGetData.size() == 1 && mapBlocksInFlight.size() == 1 && pindexLast->pprev->IsValid(BLOCK_VALID_CHAIN)) {
-                        // In any case, we want to download using a compact block, not a regular one
-                        vGetData[0] = CInv(MSG_CMPCT_BLOCK, vGetData[0].hash);
-                    }
-                    connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vGetData));
-                }
-            }
-        }
-        }
+        // Headers received via a HEADERS message should be valid, and reflect
+        // the chain the peer is on. If we receive a known-invalid header,
+        // disconnect the peer if it is using one of our outbound connection
+        // slots.
+        bool should_punish = !pfrom->fInbound && !pfrom->m_manual_connection;
+        return ProcessHeadersMessage(pfrom, connman, headers, chainparams, should_punish);
     }
 
     else if (strCommand == NetMsgType::BLOCK && !fImporting && !fReindex) // Ignore blocks received while importing
@@ -2402,8 +2549,12 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         }
         bool fNewBlock = false;
         ProcessNewBlock(chainparams, pblock, forceProcessing, &fNewBlock);
-        if (fNewBlock)
+        if (fNewBlock) {
             pfrom->nLastBlockTime = GetTime();
+        } else {
+            LOCK(cs_main);
+            mapBlockSource.erase(pblock->GetHash());
+        }
     }
 
 
@@ -2428,7 +2579,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         pfrom->fSentAddr = true;
 
         pfrom->vAddrToSend.clear();
-        std::vector<CAddress> vAddr = connman.GetAddresses();
+        std::vector<CAddress> vAddr = connman->GetAddresses();
         FastRandomContext insecure_rand;
         for (const CAddress &addr : vAddr)
             pfrom->PushAddress(addr, insecure_rand);
@@ -2444,7 +2595,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             return true;
         }
 
-        if (connman.OutboundTargetReached(false) && !pfrom->fWhitelisted)
+        if (connman->OutboundTargetReached(false) && !pfrom->fWhitelisted)
         {
             LogPrint(BCLog::NET, "mempool request with bandwidth limit reached, disconnect peer=%d\n", pfrom->GetId());
             pfrom->fDisconnect = true;
@@ -2473,7 +2624,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             // it, if the remote node sends a ping once per second and this node takes 5
             // seconds to respond to each, the 5th ping the remote sends would appear to
             // return very quickly.
-            connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::PONG, nonce));
+            connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::PONG, nonce));
         }
     }
 
@@ -2619,13 +2770,13 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
     return true;
 }
 
-static bool SendRejectsAndCheckIfBanned(CNode* pnode, CConnman& connman)
+static bool SendRejectsAndCheckIfBanned(CNode* pnode, CConnman* connman)
 {
     AssertLockHeld(cs_main);
     CNodeState &state = *State(pnode->GetId());
 
     for (const CBlockReject& reject : state.rejects) {
-        connman.PushMessage(pnode, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, (std::string)NetMsgType::BLOCK, reject.chRejectCode, reject.strRejectReason, reject.hashBlock));
+        connman->PushMessage(pnode, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, (std::string)NetMsgType::BLOCK, reject.chRejectCode, reject.strRejectReason, reject.hashBlock));
     }
     state.rejects.clear();
 
@@ -2633,15 +2784,15 @@ static bool SendRejectsAndCheckIfBanned(CNode* pnode, CConnman& connman)
         state.fShouldBan = false;
         if (pnode->fWhitelisted)
             LogPrintf("Warning: not punishing whitelisted peer %s!\n", pnode->addr.ToString());
-        else if (pnode->fAddnode)
-            LogPrintf("Warning: not punishing addnoded peer %s!\n", pnode->addr.ToString());
+        else if (pnode->m_manual_connection)
+            LogPrintf("Warning: not punishing manually-connected peer %s!\n", pnode->addr.ToString());
         else {
             pnode->fDisconnect = true;
             if (pnode->addr.IsLocal())
                 LogPrintf("Warning: not banning local peer %s!\n", pnode->addr.ToString());
             else
             {
-                connman.Ban(pnode->addr, BanReasonNodeMisbehaving);
+                connman->Ban(pnode->addr, BanReasonNodeMisbehaving);
             }
         }
         return true;
@@ -2649,7 +2800,7 @@ static bool SendRejectsAndCheckIfBanned(CNode* pnode, CConnman& connman)
     return false;
 }
 
-bool ProcessMessages(CNode* pfrom, CConnman& connman, const std::atomic<bool>& interruptMsgProc)
+bool PeerLogicValidation::ProcessMessages(CNode* pfrom, std::atomic<bool>& interruptMsgProc)
 {
     const CChainParams& chainparams = Params();
     //
@@ -2683,7 +2834,7 @@ bool ProcessMessages(CNode* pfrom, CConnman& connman, const std::atomic<bool>& i
         // Just take one message
         msgs.splice(msgs.begin(), pfrom->vProcessMsg, pfrom->vProcessMsg.begin());
         pfrom->nProcessQueueSize -= msgs.front().vRecv.size() + CMessageHeader::HEADER_SIZE;
-        pfrom->fPauseRecv = pfrom->nProcessQueueSize > connman.GetReceiveFloodSize();
+        pfrom->fPauseRecv = pfrom->nProcessQueueSize > connman->GetReceiveFloodSize();
         fMoreWork = !pfrom->vProcessMsg.empty();
     }
     CNetMessage& msg(msgs.front());
@@ -2732,7 +2883,7 @@ bool ProcessMessages(CNode* pfrom, CConnman& connman, const std::atomic<bool>& i
     }
     catch (const std::ios_base::failure& e)
     {
-        connman.PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, strCommand, REJECT_MALFORMED, std::string("error parsing message")));
+        connman->PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, strCommand, REJECT_MALFORMED, std::string("error parsing message")));
         if (strstr(e.what(), "end of data"))
         {
             // Allow exceptions from under-length message on vRecv
@@ -2756,7 +2907,7 @@ bool ProcessMessages(CNode* pfrom, CConnman& connman, const std::atomic<bool>& i
     catch (const std::exception& e) {
         PrintExceptionContinue(&e, "ProcessMessages()");
     } catch (...) {
-        PrintExceptionContinue(NULL, "ProcessMessages()");
+        PrintExceptionContinue(nullptr, "ProcessMessages()");
     }
 
     if (!fRet) {
@@ -2769,11 +2920,63 @@ bool ProcessMessages(CNode* pfrom, CConnman& connman, const std::atomic<bool>& i
     return fMoreWork;
 }
 
+void PeerLogicValidation::ConsiderEviction(CNode *pto, int64_t time_in_seconds)
+{
+    AssertLockHeld(cs_main);
+
+    CNodeState &state = *State(pto->GetId());
+    const CNetMsgMaker msgMaker(pto->GetSendVersion());
+
+    if (!state.m_chain_sync.m_protect && IsOutboundDisconnectionCandidate(pto) && state.fSyncStarted) {
+        // This is an outbound peer subject to disconnection if they don't
+        // announce a block with as much work as the current tip within
+        // CHAIN_SYNC_TIMEOUT + HEADERS_RESPONSE_TIME seconds (note: if
+        // their chain has more work than ours, we should sync to it,
+        // unless it's invalid, in which case we should find that out and
+        // disconnect from them elsewhere).
+        if (state.pindexBestKnownBlock != nullptr && state.pindexBestKnownBlock->nChainWork >= chainActive.Tip()->nChainWork) {
+            if (state.m_chain_sync.m_timeout != 0) {
+                state.m_chain_sync.m_timeout = 0;
+                state.m_chain_sync.m_work_header = nullptr;
+                state.m_chain_sync.m_sent_getheaders = false;
+            }
+        } else if (state.m_chain_sync.m_timeout == 0 || (state.m_chain_sync.m_work_header != nullptr && state.pindexBestKnownBlock != nullptr && state.pindexBestKnownBlock->nChainWork >= state.m_chain_sync.m_work_header->nChainWork)) {
+            // Our best block known by this peer is behind our tip, and we're either noticing
+            // that for the first time, OR this peer was able to catch up to some earlier point
+            // where we checked against our tip.
+            // Either way, set a new timeout based on current tip.
+            state.m_chain_sync.m_timeout = time_in_seconds + CHAIN_SYNC_TIMEOUT;
+            state.m_chain_sync.m_work_header = chainActive.Tip();
+            state.m_chain_sync.m_sent_getheaders = false;
+        } else if (state.m_chain_sync.m_timeout > 0 && time_in_seconds > state.m_chain_sync.m_timeout) {
+            // No evidence yet that our peer has synced to a chain with work equal to that
+            // of our tip, when we first detected it was behind. Send a single getheaders
+            // message to give the peer a chance to update us.
+            if (state.m_chain_sync.m_sent_getheaders) {
+                // They've run out of time to catch up!
+                LogPrintf("Disconnecting outbound peer %d for old chain, best known block = %s\n", pto->GetId(), state.pindexBestKnownBlock != nullptr ? state.pindexBestKnownBlock->GetBlockHash().ToString() : "<none>");
+                pto->fDisconnect = true;
+            } else {
+                LogPrint(BCLog::NET, "sending getheaders to outbound peer=%d to verify chain work (current best known block:%s, benchmark blockhash: %s)\n", pto->GetId(), state.pindexBestKnownBlock != nullptr ? state.pindexBestKnownBlock->GetBlockHash().ToString() : "<none>", state.m_chain_sync.m_work_header->GetBlockHash().ToString());
+                connman->PushMessage(pto, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(state.m_chain_sync.m_work_header->pprev), uint256()));
+                state.m_chain_sync.m_sent_getheaders = true;
+                constexpr int64_t HEADERS_RESPONSE_TIME = 120; // 2 minutes
+                // Bump the timeout to allow a response, which could clear the timeout
+                // (if the response shows the peer has synced), reset the timeout (if
+                // the peer syncs to the required work but not to our tip), or result
+                // in disconnect (if we advance to the timeout and pindexBestKnownBlock
+                // has not sufficiently progressed)
+                state.m_chain_sync.m_timeout = time_in_seconds + HEADERS_RESPONSE_TIME;
+            }
+        }
+    }
+}
+
 class CompareInvMempoolOrder
 {
     CTxMemPool *mp;
 public:
-    CompareInvMempoolOrder(CTxMemPool *_mempool)
+    explicit CompareInvMempoolOrder(CTxMemPool *_mempool)
     {
         mp = _mempool;
     }
@@ -2786,7 +2989,7 @@ class CompareInvMempoolOrder
     }
 };
 
-bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interruptMsgProc)
+bool PeerLogicValidation::SendMessages(CNode* pto, std::atomic<bool>& interruptMsgProc)
 {
     const Consensus::Params& consensusParams = Params().GetConsensus();
     {
@@ -2818,11 +3021,11 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
             pto->nPingUsecStart = GetTimeMicros();
             if (pto->nVersion > BIP0031_VERSION) {
                 pto->nPingNonceSent = nonce;
-                connman.PushMessage(pto, msgMaker.Make(NetMsgType::PING, nonce));
+                connman->PushMessage(pto, msgMaker.Make(NetMsgType::PING, nonce));
             } else {
                 // Peer is too old to support ping command with nonce, pong will never arrive.
                 pto->nPingNonceSent = 0;
-                connman.PushMessage(pto, msgMaker.Make(NetMsgType::PING));
+                connman->PushMessage(pto, msgMaker.Make(NetMsgType::PING));
             }
         }
 
@@ -2857,21 +3060,21 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                     // receiver rejects addr messages larger than 1000
                     if (vAddr.size() >= 1000)
                     {
-                        connman.PushMessage(pto, msgMaker.Make(NetMsgType::ADDR, vAddr));
+                        connman->PushMessage(pto, msgMaker.Make(NetMsgType::ADDR, vAddr));
                         vAddr.clear();
                     }
                 }
             }
             pto->vAddrToSend.clear();
             if (!vAddr.empty())
-                connman.PushMessage(pto, msgMaker.Make(NetMsgType::ADDR, vAddr));
+                connman->PushMessage(pto, msgMaker.Make(NetMsgType::ADDR, vAddr));
             // we only send the big addr message once
             if (pto->vAddrToSend.capacity() > 40)
                 pto->vAddrToSend.shrink_to_fit();
         }
 
         // Start block sync
-        if (pindexBestHeader == NULL)
+        if (pindexBestHeader == nullptr)
             pindexBestHeader = chainActive.Tip();
         bool fFetch = state.fPreferredDownload || (nPreferredDownload == 0 && !pto->fClient && !pto->fOneShot); // Download if this is a nice peer, or we have no nice peers and this one might do.
         if (!state.fSyncStarted && !pto->fClient && !fImporting && !fReindex) {
@@ -2891,7 +3094,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                 if (pindexStart->pprev)
                     pindexStart = pindexStart->pprev;
                 LogPrint(BCLog::NET, "initial getheaders (%d) to peer=%d (startheight:%d)\n", pindexStart->nHeight, pto->GetId(), pto->nStartingHeight);
-                connman.PushMessage(pto, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexStart), uint256()));
+                connman->PushMessage(pto, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexStart), uint256()));
             }
         }
 
@@ -2900,7 +3103,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
         // transactions become unconfirmed and spams other nodes.
         if (!fReindex && !fImporting && !IsInitialBlockDownload())
         {
-            GetMainSignals().Broadcast(nTimeBestReceived, &connman);
+            GetMainSignals().Broadcast(nTimeBestReceived, connman);
         }
 
         //
@@ -2919,7 +3122,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
             bool fRevertToInv = ((!state.fPreferHeaders &&
                                  (!state.fPreferHeaderAndIDs || pto->vBlockHashesToAnnounce.size() > 1)) ||
                                 pto->vBlockHashesToAnnounce.size() > MAX_BLOCKS_TO_ANNOUNCE);
-            const CBlockIndex *pBestIndex = NULL; // last header queued for delivery
+            const CBlockIndex *pBestIndex = nullptr; // last header queued for delivery
             ProcessBlockAvailability(pto->GetId()); // ensure pindexBestKnownBlock is up-to-date
 
             if (!fRevertToInv) {
@@ -2936,7 +3139,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                         fRevertToInv = true;
                         break;
                     }
-                    if (pBestIndex != NULL && pindex->pprev != pBestIndex) {
+                    if (pBestIndex != nullptr && pindex->pprev != pBestIndex) {
                         // This means that the list of blocks to announce don't
                         // connect to each other.
                         // This shouldn't really be possible to hit during
@@ -2957,7 +3160,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                         vHeaders.push_back(pindex->GetBlockHeader());
                     } else if (PeerHasHeader(&state, pindex)) {
                         continue; // keep looking for the first new block
-                    } else if (pindex->pprev == NULL || PeerHasHeader(&state, pindex->pprev)) {
+                    } else if (pindex->pprev == nullptr || PeerHasHeader(&state, pindex->pprev)) {
                         // Peer doesn't have this header but they do have the prior one.
                         // Start sending headers.
                         fFoundStartingHeader = true;
@@ -2984,10 +3187,10 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                         LOCK(cs_most_recent_block);
                         if (most_recent_block_hash == pBestIndex->GetBlockHash()) {
                             if (state.fWantsCmpctWitness || !fWitnessesPresentInMostRecentCompactBlock)
-                                connman.PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, *most_recent_compact_block));
+                                connman->PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, *most_recent_compact_block));
                             else {
                                 CBlockHeaderAndShortTxIDs cmpctblock(*most_recent_block, state.fWantsCmpctWitness);
-                                connman.PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock));
+                                connman->PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock));
                             }
                             fGotBlockFromCache = true;
                         }
@@ -2997,7 +3200,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                         bool ret = ReadBlockFromDisk(block, pBestIndex, consensusParams);
                         assert(ret);
                         CBlockHeaderAndShortTxIDs cmpctblock(block, state.fWantsCmpctWitness);
-                        connman.PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock));
+                        connman->PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock));
                     }
                     state.pindexBestHeaderSent = pBestIndex;
                 } else if (state.fPreferHeaders) {
@@ -3010,7 +3213,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                         LogPrint(BCLog::NET, "%s: sending header %s to peer=%d\n", __func__,
                                 vHeaders.front().GetHash().ToString(), pto->GetId());
                     }
-                    connman.PushMessage(pto, msgMaker.Make(NetMsgType::HEADERS, vHeaders));
+                    connman->PushMessage(pto, msgMaker.Make(NetMsgType::HEADERS, vHeaders));
                     state.pindexBestHeaderSent = pBestIndex;
                 } else
                     fRevertToInv = true;
@@ -3056,7 +3259,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
             for (const uint256& hash : pto->vInventoryBlockToSend) {
                 vInv.push_back(CInv(MSG_BLOCK, hash));
                 if (vInv.size() == MAX_INV_SZ) {
-                    connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv));
+                    connman->PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv));
                     vInv.clear();
                 }
             }
@@ -3102,7 +3305,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                     pto->filterInventoryKnown.insert(hash);
                     vInv.push_back(inv);
                     if (vInv.size() == MAX_INV_SZ) {
-                        connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv));
+                        connman->PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv));
                         vInv.clear();
                     }
                 }
@@ -3168,7 +3371,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                         }
                     }
                     if (vInv.size() == MAX_INV_SZ) {
-                        connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv));
+                        connman->PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv));
                         vInv.clear();
                     }
                     pto->filterInventoryKnown.insert(hash);
@@ -3176,7 +3379,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
             }
         }
         if (!vInv.empty())
-            connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv));
+            connman->PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv));
 
         // Detect whether we're stalling
         nNow = GetTimeMicros();
@@ -3235,6 +3438,9 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
             }
         }
 
+        // Check that outbound peers have reasonable chains
+        // GetTime() is used by this anti-DoS logic so we can test this using mocktime
+        ConsiderEviction(pto, GetTime());
 
         //
         // Message: getdata (blocks)
@@ -3271,7 +3477,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                 vGetData.push_back(inv);
                 if (vGetData.size() >= 1000)
                 {
-                    connman.PushMessage(pto, msgMaker.Make(NetMsgType::GETDATA, vGetData));
+                    connman->PushMessage(pto, msgMaker.Make(NetMsgType::GETDATA, vGetData));
                     vGetData.clear();
                 }
             } else {
@@ -3281,15 +3487,15 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
             pto->mapAskFor.erase(pto->mapAskFor.begin());
         }
         if (!vGetData.empty())
-            connman.PushMessage(pto, msgMaker.Make(NetMsgType::GETDATA, vGetData));
+            connman->PushMessage(pto, msgMaker.Make(NetMsgType::GETDATA, vGetData));
 
         //
         // Message: feefilter
         //
         // We don't want white listed peers to filter txs to us if we have -whitelistforcerelay
-        if (pto->nVersion >= FEEFILTER_VERSION && GetBoolArg("-feefilter", DEFAULT_FEEFILTER) &&
-            !(pto->fWhitelisted && GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY))) {
-            CAmount currentFilter = mempool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK();
+        if (pto->nVersion >= FEEFILTER_VERSION && gArgs.GetBoolArg("-feefilter", DEFAULT_FEEFILTER) &&
+            !(pto->fWhitelisted && gArgs.GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY))) {
+            CAmount currentFilter = mempool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK();
             int64_t timeNow = GetTimeMicros();
             if (timeNow > pto->nextSendTimeFeeFilter) {
                 static CFeeRate default_feerate(DEFAULT_MIN_RELAY_TX_FEE);
@@ -3298,7 +3504,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
                 // We always have a fee filter of at least minRelayTxFee
                 filterToSend = std::max(filterToSend, ::minRelayTxFee.GetFeePerK());
                 if (filterToSend != pto->lastSentFeeFilter) {
-                    connman.PushMessage(pto, msgMaker.Make(NetMsgType::FEEFILTER, filterToSend));
+                    connman->PushMessage(pto, msgMaker.Make(NetMsgType::FEEFILTER, filterToSend));
                     pto->lastSentFeeFilter = filterToSend;
                 }
                 pto->nextSendTimeFeeFilter = PoissonNextSend(timeNow, AVG_FEEFILTER_BROADCAST_INTERVAL);
diff --git a/src/net_processing.h b/src/net_processing.h
index db6d81e6b..656324bba 100644
--- a/src/net_processing.h
+++ b/src/net_processing.h
@@ -21,23 +21,40 @@ static const unsigned int DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN = 100;
  *  Timeout = base + per_header * (expected number of headers) */
 static constexpr int64_t HEADERS_DOWNLOAD_TIMEOUT_BASE = 15 * 60 * 1000000; // 15 minutes
 static constexpr int64_t HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER = 1000; // 1ms/header
+/** Protect at least this many outbound peers from disconnection due to slow/
+ * behind headers chain.
+ */
+static constexpr int32_t MAX_OUTBOUND_PEERS_TO_PROTECT_FROM_DISCONNECT = 4;
+/** Timeout for (unprotected) outbound peers to sync to our chainwork, in seconds */
+static constexpr int64_t CHAIN_SYNC_TIMEOUT = 20 * 60; // 20 minutes
 
-/** Register with a network node to receive its signals */
-void RegisterNodeSignals(CNodeSignals& nodeSignals);
-/** Unregister a network node */
-void UnregisterNodeSignals(CNodeSignals& nodeSignals);
-
-class PeerLogicValidation : public CValidationInterface {
+class PeerLogicValidation : public CValidationInterface, public NetEventsInterface {
 private:
     CConnman* connman;
 
 public:
-    PeerLogicValidation(CConnman* connmanIn);
+    explicit PeerLogicValidation(CConnman* connman);
 
     void BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindexConnected, const std::vector<CTransactionRef>& vtxConflicted) override;
     void UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) override;
     void BlockChecked(const CBlock& block, const CValidationState& state) override;
     void NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock>& pblock) override;
+
+
+    void InitializeNode(CNode* pnode) override;
+    void FinalizeNode(NodeId nodeid, bool& fUpdateConnectionTime) override;
+    /** Process protocol messages received from a given node */
+    bool ProcessMessages(CNode* pfrom, std::atomic<bool>& interrupt) override;
+    /**
+    * Send queued protocol messages to be sent to a give node.
+    *
+    * @param[in]   pto             The node which we are sending messages to.
+    * @param[in]   interrupt       Interrupt condition for processing threads
+    * @return                      True if there is more work to be done
+    */
+    bool SendMessages(CNode* pto, std::atomic<bool>& interrupt) override;
+
+    void ConsiderEviction(CNode *pto, int64_t time_in_seconds);
 };
 
 struct CNodeStateStats {
@@ -52,16 +69,4 @@ bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats);
 /** Increase a node's misbehavior score. */
 void Misbehaving(NodeId nodeid, int howmuch);
 
-/** Process protocol messages received from a given node */
-bool ProcessMessages(CNode* pfrom, CConnman& connman, const std::atomic<bool>& interrupt);
-/**
- * Send queued protocol messages to be sent to a give node.
- *
- * @param[in]   pto             The node which we are sending messages to.
- * @param[in]   connman         The connection manager for that node.
- * @param[in]   interrupt       Interrupt condition for processing threads
- * @return                      True if there is more work to be done
- */
-bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interrupt);
-
 #endif // BITCOIN_NET_PROCESSING_H
diff --git a/src/netaddress.cpp b/src/netaddress.cpp
index f31b2fc49..b8a261c92 100644
--- a/src/netaddress.cpp
+++ b/src/netaddress.cpp
@@ -271,7 +271,7 @@ std::string CNetAddr::ToStringIP() const
     socklen_t socklen = sizeof(sockaddr);
     if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) {
         char name[1025] = "";
-        if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), NULL, 0, NI_NUMERICHOST))
+        if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), nullptr, 0, NI_NUMERICHOST))
             return std::string(name);
     }
     if (IsIPv4())
@@ -407,7 +407,7 @@ static const int NET_UNKNOWN = NET_MAX + 0;
 static const int NET_TEREDO  = NET_MAX + 1;
 int static GetExtNetwork(const CNetAddr *addr)
 {
-    if (addr == NULL)
+    if (addr == nullptr)
         return NET_UNKNOWN;
     if (addr->IsRFC4380())
         return NET_TEREDO;
diff --git a/src/netaddress.h b/src/netaddress.h
index 61afe0f1f..6ca99b36b 100644
--- a/src/netaddress.h
+++ b/src/netaddress.h
@@ -36,7 +36,7 @@ class CNetAddr
 
     public:
         CNetAddr();
-        CNetAddr(const struct in_addr& ipv4Addr);
+        explicit CNetAddr(const struct in_addr& ipv4Addr);
         void Init();
         void SetIP(const CNetAddr& ip);
 
@@ -80,9 +80,9 @@ class CNetAddr
         uint64_t GetHash() const;
         bool GetInAddr(struct in_addr* pipv4Addr) const;
         std::vector<unsigned char> GetGroup() const;
-        int GetReachabilityFrom(const CNetAddr *paddrPartner = NULL) const;
+        int GetReachabilityFrom(const CNetAddr *paddrPartner = nullptr) const;
 
-        CNetAddr(const struct in6_addr& pipv6Addr, const uint32_t scope = 0);
+        explicit CNetAddr(const struct in6_addr& pipv6Addr, const uint32_t scope = 0);
         bool GetIn6Addr(struct in6_addr* pipv6Addr) const;
 
         friend bool operator==(const CNetAddr& a, const CNetAddr& b);
@@ -146,7 +146,7 @@ class CService : public CNetAddr
         CService();
         CService(const CNetAddr& ip, unsigned short port);
         CService(const struct in_addr& ipv4Addr, unsigned short port);
-        CService(const struct sockaddr_in& addr);
+        explicit CService(const struct sockaddr_in& addr);
         void Init();
         unsigned short GetPort() const;
         bool GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const;
@@ -160,7 +160,7 @@ class CService : public CNetAddr
         std::string ToStringIPPort() const;
 
         CService(const struct in6_addr& ipv6Addr, unsigned short port);
-        CService(const struct sockaddr_in6& addr);
+        explicit CService(const struct sockaddr_in6& addr);
 
         ADD_SERIALIZE_METHODS;
 
diff --git a/src/netbase.cpp b/src/netbase.cpp
index 8952468ec..82040605c 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -81,13 +81,13 @@ bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsign
 #else
     aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST;
 #endif
-    struct addrinfo *aiRes = NULL;
-    int nErr = getaddrinfo(pszName, NULL, &aiHint, &aiRes);
+    struct addrinfo *aiRes = nullptr;
+    int nErr = getaddrinfo(pszName, nullptr, &aiHint, &aiRes);
     if (nErr)
         return false;
 
     struct addrinfo *aiTrav = aiRes;
-    while (aiTrav != NULL && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions))
+    while (aiTrav != nullptr && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions))
     {
         CNetAddr resolved;
         if (aiTrav->ai_family == AF_INET)
@@ -184,6 +184,48 @@ struct timeval MillisToTimeval(int64_t nTimeout)
     return timeout;
 }
 
+/** SOCKS version */
+enum SOCKSVersion: uint8_t {
+    SOCKS4 = 0x04,
+    SOCKS5 = 0x05
+};
+
+/** Values defined for METHOD in RFC1928 */
+enum SOCKS5Method: uint8_t {
+    NOAUTH = 0x00,        //! No authentication required
+    GSSAPI = 0x01,        //! GSSAPI
+    USER_PASS = 0x02,     //! Username/password
+    NO_ACCEPTABLE = 0xff, //! No acceptable methods
+};
+
+/** Values defined for CMD in RFC1928 */
+enum SOCKS5Command: uint8_t {
+    CONNECT = 0x01,
+    BIND = 0x02,
+    UDP_ASSOCIATE = 0x03
+};
+
+/** Values defined for REP in RFC1928 */
+enum SOCKS5Reply: uint8_t {
+    SUCCEEDED = 0x00,        //! Succeeded
+    GENFAILURE = 0x01,       //! General failure
+    NOTALLOWED = 0x02,       //! Connection not allowed by ruleset
+    NETUNREACHABLE = 0x03,   //! Network unreachable
+    HOSTUNREACHABLE = 0x04,  //! Network unreachable
+    CONNREFUSED = 0x05,      //! Connection refused
+    TTLEXPIRED = 0x06,       //! TTL expired
+    CMDUNSUPPORTED = 0x07,   //! Command not supported
+    ATYPEUNSUPPORTED = 0x08, //! Address type not supported
+};
+
+/** Values defined for ATYPE in RFC1928 */
+enum SOCKS5Atyp: uint8_t {
+    IPV4 = 0x01,
+    DOMAINNAME = 0x03,
+    IPV6 = 0x04,
+};
+
+/** Status codes that can be returned by InterruptibleRecv */
 enum class IntrRecvError {
     OK,
     Timeout,
@@ -203,7 +245,7 @@ enum class IntrRecvError {
  *
  * @note This function requires that hSocket is in non-blocking mode.
  */
-static IntrRecvError InterruptibleRecv(char* data, size_t len, int timeout, const SOCKET& hSocket)
+static IntrRecvError InterruptibleRecv(uint8_t* data, size_t len, int timeout, const SOCKET& hSocket)
 {
     int64_t curTime = GetTimeMillis();
     int64_t endTime = curTime + timeout;
@@ -211,7 +253,7 @@ static IntrRecvError InterruptibleRecv(char* data, size_t len, int timeout, cons
     // to break off in case of an interruption.
     const int64_t maxWait = 1000;
     while (len > 0 && curTime < endTime) {
-        ssize_t ret = recv(hSocket, data, len, 0); // Optimistically try the recv first
+        ssize_t ret = recv(hSocket, (char*)data, len, 0); // Optimistically try the recv first
         if (ret > 0) {
             len -= ret;
             data += ret;
@@ -227,7 +269,7 @@ static IntrRecvError InterruptibleRecv(char* data, size_t len, int timeout, cons
                 fd_set fdset;
                 FD_ZERO(&fdset);
                 FD_SET(hSocket, &fdset);
-                int nRet = select(hSocket + 1, &fdset, NULL, NULL, &tval);
+                int nRet = select(hSocket + 1, &fdset, nullptr, nullptr, &tval);
                 if (nRet == SOCKET_ERROR) {
                     return IntrRecvError::NetworkError;
                 }
@@ -242,24 +284,35 @@ static IntrRecvError InterruptibleRecv(char* data, size_t len, int timeout, cons
     return len == 0 ? IntrRecvError::OK : IntrRecvError::Timeout;
 }
 
+/** Credentials for proxy authentication */
 struct ProxyCredentials
 {
     std::string username;
     std::string password;
 };
 
-std::string Socks5ErrorString(int err)
+/** Convert SOCKS5 reply to an error message */
+std::string Socks5ErrorString(uint8_t err)
 {
     switch(err) {
-        case 0x01: return "general failure";
-        case 0x02: return "connection not allowed";
-        case 0x03: return "network unreachable";
-        case 0x04: return "host unreachable";
-        case 0x05: return "connection refused";
-        case 0x06: return "TTL expired";
-        case 0x07: return "protocol error";
-        case 0x08: return "address type not supported";
-        default:   return "unknown";
+        case SOCKS5Reply::GENFAILURE:
+            return "general failure";
+        case SOCKS5Reply::NOTALLOWED:
+            return "connection not allowed";
+        case SOCKS5Reply::NETUNREACHABLE:
+            return "network unreachable";
+        case SOCKS5Reply::HOSTUNREACHABLE:
+            return "host unreachable";
+        case SOCKS5Reply::CONNREFUSED:
+            return "connection refused";
+        case SOCKS5Reply::TTLEXPIRED:
+            return "TTL expired";
+        case SOCKS5Reply::CMDUNSUPPORTED:
+            return "protocol error";
+        case SOCKS5Reply::ATYPEUNSUPPORTED:
+            return "address type not supported";
+        default:
+            return "unknown";
     }
 }
 
@@ -274,34 +327,34 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials
     }
     // Accepted authentication methods
     std::vector<uint8_t> vSocks5Init;
-    vSocks5Init.push_back(0x05);
+    vSocks5Init.push_back(SOCKSVersion::SOCKS5);
     if (auth) {
-        vSocks5Init.push_back(0x02); // # METHODS
-        vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
-        vSocks5Init.push_back(0x02); // X'02' USERNAME/PASSWORD (RFC1929)
+        vSocks5Init.push_back(0x02); // Number of methods
+        vSocks5Init.push_back(SOCKS5Method::NOAUTH);
+        vSocks5Init.push_back(SOCKS5Method::USER_PASS);
     } else {
-        vSocks5Init.push_back(0x01); // # METHODS
-        vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
+        vSocks5Init.push_back(0x01); // Number of methods
+        vSocks5Init.push_back(SOCKS5Method::NOAUTH);
     }
     ssize_t ret = send(hSocket, (const char*)vSocks5Init.data(), vSocks5Init.size(), MSG_NOSIGNAL);
     if (ret != (ssize_t)vSocks5Init.size()) {
         CloseSocket(hSocket);
         return error("Error sending to proxy");
     }
-    char pchRet1[2];
+    uint8_t pchRet1[2];
     if ((recvr = InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
         CloseSocket(hSocket);
         LogPrintf("Socks5() connect to %s:%d failed: InterruptibleRecv() timeout or other failure\n", strDest, port);
         return false;
     }
-    if (pchRet1[0] != 0x05) {
+    if (pchRet1[0] != SOCKSVersion::SOCKS5) {
         CloseSocket(hSocket);
         return error("Proxy failed to initialize");
     }
-    if (pchRet1[1] == 0x02 && auth) {
+    if (pchRet1[1] == SOCKS5Method::USER_PASS && auth) {
         // Perform username/password authentication (as described in RFC1929)
         std::vector<uint8_t> vAuth;
-        vAuth.push_back(0x01);
+        vAuth.push_back(0x01); // Current (and only) version of user/pass subnegotiation
         if (auth->username.size() > 255 || auth->password.size() > 255)
             return error("Proxy username or password too long");
         vAuth.push_back(auth->username.size());
@@ -314,7 +367,7 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials
             return error("Error sending authentication to proxy");
         }
         LogPrint(BCLog::PROXY, "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password);
-        char pchRetA[2];
+        uint8_t pchRetA[2];
         if ((recvr = InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
             CloseSocket(hSocket);
             return error("Error reading proxy authentication response");
@@ -323,17 +376,17 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials
             CloseSocket(hSocket);
             return error("Proxy authentication unsuccessful");
         }
-    } else if (pchRet1[1] == 0x00) {
+    } else if (pchRet1[1] == SOCKS5Method::NOAUTH) {
         // Perform no authentication
     } else {
         CloseSocket(hSocket);
         return error("Proxy requested wrong authentication method %02x", pchRet1[1]);
     }
     std::vector<uint8_t> vSocks5;
-    vSocks5.push_back(0x05); // VER protocol version
-    vSocks5.push_back(0x01); // CMD CONNECT
-    vSocks5.push_back(0x00); // RSV Reserved
-    vSocks5.push_back(0x03); // ATYP DOMAINNAME
+    vSocks5.push_back(SOCKSVersion::SOCKS5); // VER protocol version
+    vSocks5.push_back(SOCKS5Command::CONNECT); // CMD CONNECT
+    vSocks5.push_back(0x00); // RSV Reserved must be 0
+    vSocks5.push_back(SOCKS5Atyp::DOMAINNAME); // ATYP DOMAINNAME
     vSocks5.push_back(strDest.size()); // Length<=255 is checked at beginning of function
     vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end());
     vSocks5.push_back((port >> 8) & 0xFF);
@@ -343,7 +396,7 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials
         CloseSocket(hSocket);
         return error("Error sending to proxy");
     }
-    char pchRet2[4];
+    uint8_t pchRet2[4];
     if ((recvr = InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
         CloseSocket(hSocket);
         if (recvr == IntrRecvError::Timeout) {
@@ -355,26 +408,26 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials
             return error("Error while reading proxy response");
         }
     }
-    if (pchRet2[0] != 0x05) {
+    if (pchRet2[0] != SOCKSVersion::SOCKS5) {
         CloseSocket(hSocket);
         return error("Proxy failed to accept request");
     }
-    if (pchRet2[1] != 0x00) {
+    if (pchRet2[1] != SOCKS5Reply::SUCCEEDED) {
         // Failures to connect to a peer that are not proxy errors
         CloseSocket(hSocket);
         LogPrintf("Socks5() connect to %s:%d failed: %s\n", strDest, port, Socks5ErrorString(pchRet2[1]));
         return false;
     }
-    if (pchRet2[2] != 0x00) {
+    if (pchRet2[2] != 0x00) { // Reserved field must be 0
         CloseSocket(hSocket);
         return error("Error: malformed proxy response");
     }
-    char pchRet3[256];
+    uint8_t pchRet3[256];
     switch (pchRet2[3])
     {
-        case 0x01: recvr = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break;
-        case 0x04: recvr = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break;
-        case 0x03:
+        case SOCKS5Atyp::IPV4: recvr = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break;
+        case SOCKS5Atyp::IPV6: recvr = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break;
+        case SOCKS5Atyp::DOMAINNAME:
         {
             recvr = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket);
             if (recvr != IntrRecvError::OK) {
@@ -399,7 +452,7 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials
     return true;
 }
 
-bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRet, int nTimeout)
+bool ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRet, int nTimeout)
 {
     hSocketRet = INVALID_SOCKET;
 
@@ -439,7 +492,7 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
             fd_set fdset;
             FD_ZERO(&fdset);
             FD_SET(hSocket, &fdset);
-            int nRet = select(hSocket + 1, NULL, &fdset, NULL, &timeout);
+            int nRet = select(hSocket + 1, nullptr, &fdset, nullptr, &timeout);
             if (nRet == 0)
             {
                 LogPrint(BCLog::NET, "connection to %s timeout\n", addrConnect.ToString());
@@ -534,7 +587,7 @@ bool IsProxy(const CNetAddr &addr) {
     return false;
 }
 
-static bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
+bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
 {
     SOCKET hSocket = INVALID_SOCKET;
     // first connect to proxy server
@@ -558,47 +611,6 @@ static bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDe
     hSocketRet = hSocket;
     return true;
 }
-
-bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
-{
-    proxyType proxy;
-    if (outProxyConnectionFailed)
-        *outProxyConnectionFailed = false;
-
-    if (GetProxy(addrDest.GetNetwork(), proxy))
-        return ConnectThroughProxy(proxy, addrDest.ToStringIP(), addrDest.GetPort(), hSocketRet, nTimeout, outProxyConnectionFailed);
-    else // no proxy needed (none set for target network)
-        return ConnectSocketDirectly(addrDest, hSocketRet, nTimeout);
-}
-
-bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout, bool *outProxyConnectionFailed)
-{
-    std::string strDest;
-    int port = portDefault;
-
-    if (outProxyConnectionFailed)
-        *outProxyConnectionFailed = false;
-
-    SplitHostPort(std::string(pszDest), port, strDest);
-
-    proxyType proxy;
-    GetNameProxy(proxy);
-
-    std::vector<CService> addrResolved;
-    if (Lookup(strDest.c_str(), addrResolved, port, fNameLookup && !HaveNameProxy(), 256)) {
-        if (addrResolved.size() > 0) {
-            addr = addrResolved[GetRand(addrResolved.size())];
-            return ConnectSocket(addr, hSocketRet, nTimeout);
-        }
-    }
-
-    addr = CService();
-
-    if (!HaveNameProxy())
-        return false;
-    return ConnectThroughProxy(proxy, strDest, port, hSocketRet, nTimeout, outProxyConnectionFailed);
-}
-
 bool LookupSubNet(const char* pszName, CSubNet& ret)
 {
     std::string strSubnet(pszName);
@@ -642,8 +654,8 @@ std::string NetworkErrorString(int err)
     char buf[256];
     buf[0] = 0;
     if(FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
-            NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
-            buf, sizeof(buf), NULL))
+            nullptr, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+            buf, sizeof(buf), nullptr))
     {
         return strprintf("%s (%d)", buf, err);
     }
diff --git a/src/netbase.h b/src/netbase.h
index 941da31f9..e7d7bcb37 100644
--- a/src/netbase.h
+++ b/src/netbase.h
@@ -29,7 +29,7 @@ class proxyType
 {
 public:
     proxyType(): randomize_credentials(false) {}
-    proxyType(const CService &_proxy, bool _randomize_credentials=false): proxy(_proxy), randomize_credentials(_randomize_credentials) {}
+    explicit proxyType(const CService &_proxy, bool _randomize_credentials=false): proxy(_proxy), randomize_credentials(_randomize_credentials) {}
 
     bool IsValid() const { return proxy.IsValid(); }
 
@@ -44,14 +44,15 @@ bool GetProxy(enum Network net, proxyType &proxyInfoOut);
 bool IsProxy(const CNetAddr &addr);
 bool SetNameProxy(const proxyType &addrProxy);
 bool HaveNameProxy();
+bool GetNameProxy(proxyType &nameProxyOut);
 bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup);
 bool LookupHost(const char *pszName, CNetAddr& addr, bool fAllowLookup);
 bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLookup);
 bool Lookup(const char *pszName, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions);
 CService LookupNumeric(const char *pszName, int portDefault = 0);
 bool LookupSubNet(const char *pszName, CSubNet& subnet);
-bool ConnectSocket(const CService &addr, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed = 0);
-bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout, bool *outProxyConnectionFailed = 0);
+bool ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRet, int nTimeout);
+bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed);
 /** Return readable error string for a network error code */
 std::string NetworkErrorString(int err);
 /** Close socket and set hSocket to INVALID_SOCKET */
diff --git a/src/netmessagemaker.h b/src/netmessagemaker.h
index 8e8a6e4a0..79b2501c5 100644
--- a/src/netmessagemaker.h
+++ b/src/netmessagemaker.h
@@ -12,7 +12,7 @@
 class CNetMsgMaker
 {
 public:
-    CNetMsgMaker(int nVersionIn) : nVersion(nVersionIn){}
+    explicit CNetMsgMaker(int nVersionIn) : nVersion(nVersionIn){}
 
     template <typename... Args>
     CSerializedNetMsg Make(int nFlags, std::string sCommand, Args&&... args) const
diff --git a/src/policy/feerate.h b/src/policy/feerate.h
index 565da6c15..3449cdd69 100644
--- a/src/policy/feerate.h
+++ b/src/policy/feerate.h
@@ -20,13 +20,17 @@ class CFeeRate
 {
 private:
     CAmount nSatoshisPerK; // unit is satoshis-per-1,000-bytes
+
 public:
     /** Fee rate of 0 satoshis per kB */
     CFeeRate() : nSatoshisPerK(0) { }
-    explicit CFeeRate(const CAmount& _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) { }
+    template<typename I>
+    CFeeRate(const I _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) {
+        // We've previously had bugs creep in from silent double->int conversion...
+        static_assert(std::is_integral<I>::value, "CFeeRate should be used without floats");
+    }
     /** Constructor for a fee rate in satoshis per kB. The size in bytes must not exceed (2^63 - 1)*/
     CFeeRate(const CAmount& nFeePaid, size_t nBytes);
-    CFeeRate(const CFeeRate& other) { nSatoshisPerK = other.nSatoshisPerK; }
     /**
      * Return the fee in satoshis for the given size in bytes.
      */
diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp
index b9476407c..c7e57671c 100644
--- a/src/policy/fees.cpp
+++ b/src/policy/fees.cpp
@@ -180,6 +180,7 @@ TxConfirmStats::TxConfirmStats(const std::vector<double>& defaultBuckets,
     : buckets(defaultBuckets), bucketMap(defaultBucketMap)
 {
     decay = _decay;
+    assert(_scale != 0 && "_scale must be non-zero");
     scale = _scale;
     confAvg.resize(maxPeriods);
     for (unsigned int i = 0; i < maxPeriods; i++) {
@@ -418,6 +419,9 @@ void TxConfirmStats::Read(CAutoFile& filein, int nFileVersion, size_t numBuckets
             throw std::runtime_error("Corrupt estimates file. Decay must be between 0 and 1 (non-inclusive)");
         }
         filein >> scale;
+        if (scale == 0) {
+            throw std::runtime_error("Corrupt estimates file. Scale must be non-zero");
+        }
     }
 
     filein >> avg;
@@ -503,6 +507,7 @@ void TxConfirmStats::removeTx(unsigned int entryHeight, unsigned int nBestSeenHe
         }
     }
     if (!inBlock && (unsigned int)blocksAgo >= scale) { // Only counts as a failure if not confirmed for entire period
+        assert(scale != 0);
         unsigned int periodsAgo = blocksAgo / scale;
         for (size_t i = 0; i < periodsAgo && i < failAvg.size(); i++) {
             failAvg[i][bucketindex]++;
@@ -714,7 +719,7 @@ CFeeRate CBlockPolicyEstimator::estimateRawFee(int confTarget, double successThr
     if (median < 0)
         return CFeeRate(0);
 
-    return CFeeRate(median);
+    return CFeeRate(llround(median));
 }
 
 unsigned int CBlockPolicyEstimator::HighestTargetTracked(FeeEstimateHorizon horizon) const
@@ -901,7 +906,7 @@ CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, FeeCalculation
 
     if (median < 0) return CFeeRate(0); // error condition
 
-    return CFeeRate(median);
+    return CFeeRate(llround(median));
 }
 
 
@@ -1043,5 +1048,5 @@ CAmount FeeFilterRounder::round(CAmount currentMinFee)
     if ((it != feeset.begin() && insecure_rand.rand32() % 3 != 0) || it == feeset.end()) {
         it--;
     }
-    return *it;
+    return static_cast<CAmount>(*it);
 }
diff --git a/src/policy/fees.h b/src/policy/fees.h
index f4ef79364..6edaf2871 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -284,7 +284,7 @@ class FeeFilterRounder
 
 public:
     /** Create new FeeFilterRounder */
-    FeeFilterRounder(const CFeeRate& minIncrementalFee);
+    explicit FeeFilterRounder(const CFeeRate& minIncrementalFee);
 
     /** Quantize a minimum fee for privacy purpose before broadcast **/
     CAmount round(CAmount currentMinFee);
diff --git a/src/policy/policy.cpp b/src/policy/policy.cpp
index 605e3e069..b2fb28450 100644
--- a/src/policy/policy.cpp
+++ b/src/policy/policy.cpp
@@ -54,23 +54,6 @@ bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFeeIn)
     return (txout.nValue < GetDustThreshold(txout, dustRelayFeeIn));
 }
 
-    /**
-     * Check transaction inputs to mitigate two
-     * potential denial-of-service attacks:
-     * 
-     * 1. scriptSigs with extra data stuffed into them,
-     *    not consumed by scriptPubKey (or P2SH script)
-     * 2. P2SH scripts with a crazy number of expensive
-     *    CHECKSIG/CHECKMULTISIG operations
-     *
-     * Why bother? To avoid denial-of-service attacks; an attacker
-     * can submit a standard HASH... OP_EQUAL transaction,
-     * which will get accepted into blocks. The redemption
-     * script can be anything; an attacker could use a very
-     * expensive-to-check-upon-redemption script like:
-     *   DUP CHECKSIG DROP ... repeated 100 times... OP_1
-     */
-
 bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType, const bool witnessEnabled)
 {
     std::vector<std::vector<unsigned char> > vSolutions;
@@ -93,7 +76,7 @@ bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType, const bool w
     else if (!witnessEnabled && (whichType == TX_WITNESS_V0_KEYHASH || whichType == TX_WITNESS_V0_SCRIPTHASH))
         return false;
 
-    return whichType != TX_NONSTANDARD;
+    return whichType != TX_NONSTANDARD && whichType != TX_WITNESS_UNKNOWN;
 }
 
 bool IsStandardTx(const CTransaction& tx, std::string& reason, const bool witnessEnabled)
@@ -160,6 +143,22 @@ bool IsStandardTx(const CTransaction& tx, std::string& reason, const bool witnes
     return true;
 }
 
+/**
+ * Check transaction inputs to mitigate two
+ * potential denial-of-service attacks:
+ *
+ * 1. scriptSigs with extra data stuffed into them,
+ *    not consumed by scriptPubKey (or P2SH script)
+ * 2. P2SH scripts with a crazy number of expensive
+ *    CHECKSIG/CHECKMULTISIG operations
+ *
+ * Why bother? To avoid denial-of-service attacks; an attacker
+ * can submit a standard HASH... OP_EQUAL transaction,
+ * which will get accepted into blocks. The redemption
+ * script can be anything; an attacker could use a very
+ * expensive-to-check-upon-redemption script like:
+ *   DUP CHECKSIG DROP ... repeated 100 times... OP_1
+ */
 bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
 {
     if (tx.IsCoinBase())
diff --git a/src/policy/policy.h b/src/policy/policy.h
index c06820f84..ef71dd73b 100644
--- a/src/policy/policy.h
+++ b/src/policy/policy.h
@@ -16,10 +16,8 @@
 class CCoinsViewCache;
 class CTxOut;
 
-/** Default for -blockmaxsize, which controls the maximum size of block the mining code will create **/
-static const unsigned int DEFAULT_BLOCK_MAX_SIZE = 750000;
 /** Default for -blockmaxweight, which controls the range of block weights the mining code will create **/
-static const unsigned int DEFAULT_BLOCK_MAX_WEIGHT = 3000000;
+static const unsigned int DEFAULT_BLOCK_MAX_WEIGHT = MAX_BLOCK_WEIGHT - 4000;
 /** Default for -blockmintxfee, which sets the minimum feerate for a transaction in blocks created by mining code **/
 static const unsigned int DEFAULT_BLOCK_MIN_TX_FEE = 1000;
 /** The maximum weight for transactions we're willing to relay/mine */
diff --git a/src/pow.cpp b/src/pow.cpp
index 8ac425aaf..93ed7f6e8 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -12,7 +12,7 @@
 
 unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params& params)
 {
-    assert(pindexLast != NULL);
+    assert(pindexLast != nullptr);
     unsigned int nProofOfWorkLimit = UintToArith256(params.powLimit).GetCompact();
 
     // Only change once per difficulty adjustment interval
diff --git a/src/prevector.h b/src/prevector.h
index 46640d6ff..eb29b3ae7 100644
--- a/src/prevector.h
+++ b/src/prevector.h
@@ -2,8 +2,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef _BITCOIN_PREVECTOR_H_
-#define _BITCOIN_PREVECTOR_H_
+#ifndef BITCOIN_PREVECTOR_H
+#define BITCOIN_PREVECTOR_H
 
 #include <assert.h>
 #include <stdlib.h>
@@ -448,7 +448,7 @@ class prevector {
         }
         if (!is_direct()) {
             free(_union.indirect);
-            _union.indirect = NULL;
+            _union.indirect = nullptr;
         }
     }
 
@@ -514,4 +514,4 @@ class prevector {
 };
 #pragma pack(pop)
 
-#endif
+#endif // BITCOIN_PREVECTOR_H
diff --git a/src/primitives/block.h b/src/primitives/block.h
index c90a1dfa6..292df4089 100644
--- a/src/primitives/block.h
+++ b/src/primitives/block.h
@@ -129,7 +129,7 @@ struct CBlockLocator
 
     CBlockLocator() {}
 
-    CBlockLocator(const std::vector<uint256>& vHaveIn) : vHave(vHaveIn) {}
+    explicit CBlockLocator(const std::vector<uint256>& vHaveIn) : vHave(vHaveIn) {}
 
     ADD_SERIALIZE_METHODS;
 
diff --git a/src/primitives/transaction.cpp b/src/primitives/transaction.cpp
index 9b6a814e1..e0a106adb 100644
--- a/src/primitives/transaction.cpp
+++ b/src/primitives/transaction.cpp
@@ -55,7 +55,7 @@ std::string CTxOut::ToString() const
 }
 
 CMutableTransaction::CMutableTransaction() : nVersion(CTransaction::CURRENT_VERSION), nLockTime(0) {}
-CMutableTransaction::CMutableTransaction(const CTransaction& tx) : nVersion(tx.nVersion), vin(tx.vin), vout(tx.vout), nLockTime(tx.nLockTime) {}
+CMutableTransaction::CMutableTransaction(const CTransaction& tx) : vin(tx.vin), vout(tx.vout), nVersion(tx.nVersion), nLockTime(tx.nLockTime) {}
 
 uint256 CMutableTransaction::GetHash() const
 {
@@ -76,9 +76,9 @@ uint256 CTransaction::GetWitnessHash() const
 }
 
 /* For backward compatibility, the hash is initialized to 0. TODO: remove the need for this default constructor entirely. */
-CTransaction::CTransaction() : nVersion(CTransaction::CURRENT_VERSION), vin(), vout(), nLockTime(0), hash() {}
-CTransaction::CTransaction(const CMutableTransaction &tx) : nVersion(tx.nVersion), vin(tx.vin), vout(tx.vout), nLockTime(tx.nLockTime), hash(ComputeHash()) {}
-CTransaction::CTransaction(CMutableTransaction &&tx) : nVersion(tx.nVersion), vin(std::move(tx.vin)), vout(std::move(tx.vout)), nLockTime(tx.nLockTime), hash(ComputeHash()) {}
+CTransaction::CTransaction() : vin(), vout(), nVersion(CTransaction::CURRENT_VERSION), nLockTime(0), hash() {}
+CTransaction::CTransaction(const CMutableTransaction &tx) : vin(tx.vin), vout(tx.vout), nVersion(tx.nVersion), nLockTime(tx.nLockTime), hash(ComputeHash()) {}
+CTransaction::CTransaction(CMutableTransaction &&tx) : vin(std::move(tx.vin)), vout(std::move(tx.vout)), nVersion(tx.nVersion), nLockTime(tx.nLockTime), hash(ComputeHash()) {}
 
 CAmount CTransaction::GetValueOut() const
 {
diff --git a/src/primitives/transaction.h b/src/primitives/transaction.h
index 041034bb8..18d524e23 100644
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -278,9 +278,9 @@ class CTransaction
     // actually immutable; deserialization and assignment are implemented,
     // and bypass the constness. This is safe, as they update the entire
     // structure, including the hash.
-    const int32_t nVersion;
     const std::vector<CTxIn> vin;
     const std::vector<CTxOut> vout;
+    const int32_t nVersion;
     const uint32_t nLockTime;
 
 private:
@@ -361,9 +361,9 @@ class CTransaction
 /** A mutable version of CTransaction. */
 struct CMutableTransaction
 {
-    int32_t nVersion;
     std::vector<CTxIn> vin;
     std::vector<CTxOut> vout;
+    int32_t nVersion;
     uint32_t nLockTime;
 
     CMutableTransaction();
diff --git a/src/protocol.h b/src/protocol.h
index 7890bb627..56b59aed3 100644
--- a/src/protocol.h
+++ b/src/protocol.h
@@ -39,7 +39,7 @@ class CMessageHeader
     };
     typedef unsigned char MessageStartChars[MESSAGE_START_SIZE];
 
-    CMessageHeader(const MessageStartChars& pchMessageStartIn);
+    explicit CMessageHeader(const MessageStartChars& pchMessageStartIn);
     CMessageHeader(const MessageStartChars& pchMessageStartIn, const char* pszCommand, unsigned int nMessageSizeIn);
 
     std::string GetCommand() const;
@@ -277,6 +277,43 @@ enum ServiceFlags : uint64_t {
     // BIP process.
 };
 
+/**
+ * Gets the set of service flags which are "desirable" for a given peer.
+ *
+ * These are the flags which are required for a peer to support for them
+ * to be "interesting" to us, ie for us to wish to use one of our few
+ * outbound connection slots for or for us to wish to prioritize keeping
+ * their connection around.
+ *
+ * Relevant service flags may be peer- and state-specific in that the
+ * version of the peer may determine which flags are required (eg in the
+ * case of NODE_NETWORK_LIMITED where we seek out NODE_NETWORK peers
+ * unless they set NODE_NETWORK_LIMITED and we are out of IBD, in which
+ * case NODE_NETWORK_LIMITED suffices).
+ *
+ * Thus, generally, avoid calling with peerServices == NODE_NONE.
+ */
+static ServiceFlags GetDesirableServiceFlags(ServiceFlags services) {
+    return ServiceFlags(NODE_NETWORK | NODE_WITNESS);
+}
+
+/**
+ * A shortcut for (services & GetDesirableServiceFlags(services))
+ * == GetDesirableServiceFlags(services), ie determines whether the given
+ * set of service flags are sufficient for a peer to be "relevant".
+ */
+static inline bool HasAllDesirableServiceFlags(ServiceFlags services) {
+    return !(GetDesirableServiceFlags(services) & (~services));
+}
+
+/**
+ * Checks if a peer with the given service flags may be capable of having a
+ * robust address-storage DB. Currently an alias for checking NODE_NETWORK.
+ */
+static inline bool MayHaveUsefulAddressDB(ServiceFlags services) {
+    return services & NODE_NETWORK;
+}
+
 /** A CService with information about it as peer */
 class CAddress : public CService
 {
diff --git a/src/pubkey.cpp b/src/pubkey.cpp
index 91af4e56f..2dd0a87fc 100644
--- a/src/pubkey.cpp
+++ b/src/pubkey.cpp
@@ -10,7 +10,7 @@
 namespace
 {
 /* Global secp256k1_context object used for verification. */
-secp256k1_context* secp256k1_context_verify = NULL;
+secp256k1_context* secp256k1_context_verify = nullptr;
 } // namespace
 
 /** This function is taken from the libsecp256k1 distribution and implements
@@ -126,7 +126,6 @@ static int ecdsa_signature_parse_der_lax(const secp256k1_context* ctx, secp256k1
         return 0;
     }
     spos = pos;
-    pos += slen;
 
     /* Ignore leading zeroes in R */
     while (rlen > 0 && input[rpos] == 0) {
@@ -274,7 +273,7 @@ bool CExtPubKey::Derive(CExtPubKey &out, unsigned int _nChild) const {
     if (!ecdsa_signature_parse_der_lax(secp256k1_context_verify, &sig, vchSig.data(), vchSig.size())) {
         return false;
     }
-    return (!secp256k1_ecdsa_signature_normalize(secp256k1_context_verify, NULL, &sig));
+    return (!secp256k1_ecdsa_signature_normalize(secp256k1_context_verify, nullptr, &sig));
 }
 
 /* static */ int ECCVerifyHandle::refcount = 0;
@@ -282,9 +281,9 @@ bool CExtPubKey::Derive(CExtPubKey &out, unsigned int _nChild) const {
 ECCVerifyHandle::ECCVerifyHandle()
 {
     if (refcount == 0) {
-        assert(secp256k1_context_verify == NULL);
+        assert(secp256k1_context_verify == nullptr);
         secp256k1_context_verify = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY);
-        assert(secp256k1_context_verify != NULL);
+        assert(secp256k1_context_verify != nullptr);
     }
     refcount++;
 }
@@ -293,8 +292,8 @@ ECCVerifyHandle::~ECCVerifyHandle()
 {
     refcount--;
     if (refcount == 0) {
-        assert(secp256k1_context_verify != NULL);
+        assert(secp256k1_context_verify != nullptr);
         secp256k1_context_destroy(secp256k1_context_verify);
-        secp256k1_context_verify = NULL;
+        secp256k1_context_verify = nullptr;
     }
 }
diff --git a/src/pubkey.h b/src/pubkey.h
index dbf0e23f2..65738d8fe 100644
--- a/src/pubkey.h
+++ b/src/pubkey.h
@@ -30,7 +30,7 @@ class CKeyID : public uint160
 {
 public:
     CKeyID() : uint160() {}
-    CKeyID(const uint160& in) : uint160(in) {}
+    explicit CKeyID(const uint160& in) : uint160(in) {}
 };
 
 typedef uint256 ChainCode;
@@ -88,7 +88,7 @@ class CPubKey
     }
 
     //! Construct a public key from a byte vector.
-    CPubKey(const std::vector<unsigned char>& _vch)
+    explicit CPubKey(const std::vector<unsigned char>& _vch)
     {
         Set(_vch.begin(), _vch.end());
     }
diff --git a/src/qt/addressbookpage.cpp b/src/qt/addressbookpage.cpp
index cebac46b9..f295bd468 100644
--- a/src/qt/addressbookpage.cpp
+++ b/src/qt/addressbookpage.cpp
@@ -273,7 +273,7 @@ void AddressBookPage::on_exportButton_clicked()
     // CSV is currently the only supported format
     QString filename = GUIUtil::getSaveFileName(this,
         tr("Export Address List"), QString(),
-        tr("Comma separated file (*.csv)"), NULL);
+        tr("Comma separated file (*.csv)"), nullptr);
 
     if (filename.isNull())
         return;
diff --git a/src/qt/addresstablemodel.cpp b/src/qt/addresstablemodel.cpp
index 2fa032abd..0eb7ec430 100644
--- a/src/qt/addresstablemodel.cpp
+++ b/src/qt/addresstablemodel.cpp
@@ -82,14 +82,14 @@ class AddressTablePriv
             LOCK(wallet->cs_wallet);
             for (const std::pair<CTxDestination, CAddressBookData>& item : wallet->mapAddressBook)
             {
-                const CBitcoinAddress& address = item.first;
-                bool fMine = IsMine(*wallet, address.Get());
+                const CTxDestination& address = item.first;
+                bool fMine = IsMine(*wallet, address);
                 AddressTableEntry::Type addressType = translateTransactionType(
                         QString::fromStdString(item.second.purpose), fMine);
                 const std::string& strName = item.second.name;
                 cachedAddressTable.append(AddressTableEntry(addressType,
                                   QString::fromStdString(strName),
-                                  QString::fromStdString(address.ToString())));
+                                  QString::fromStdString(EncodeDestination(address))));
             }
         }
         // qLowerBound() and qUpperBound() require our cachedAddressTable list to be sorted in asc order
@@ -246,7 +246,7 @@ bool AddressTableModel::setData(const QModelIndex &index, const QVariant &value,
     if(role == Qt::EditRole)
     {
         LOCK(wallet->cs_wallet); /* For SetAddressBook / DelAddressBook */
-        CTxDestination curAddress = CBitcoinAddress(rec->address.toStdString()).Get();
+        CTxDestination curAddress = DecodeDestination(rec->address.toStdString());
         if(index.column() == Label)
         {
             // Do nothing, if old label == new label
@@ -257,7 +257,7 @@ bool AddressTableModel::setData(const QModelIndex &index, const QVariant &value,
             }
             wallet->SetAddressBook(curAddress, value.toString().toStdString(), strPurpose);
         } else if(index.column() == Address) {
-            CTxDestination newAddress = CBitcoinAddress(value.toString().toStdString()).Get();
+            CTxDestination newAddress = DecodeDestination(value.toString().toStdString());
             // Refuse to set invalid address, set error status and return false
             if(boost::get<CNoDestination>(&newAddress))
             {
@@ -358,7 +358,7 @@ QString AddressTableModel::addRow(const QString &type, const QString &label, con
         // Check for duplicate addresses
         {
             LOCK(wallet->cs_wallet);
-            if(wallet->mapAddressBook.count(CBitcoinAddress(strAddress).Get()))
+            if(wallet->mapAddressBook.count(DecodeDestination(strAddress)))
             {
                 editStatus = DUPLICATE_ADDRESS;
                 return QString();
@@ -384,7 +384,7 @@ QString AddressTableModel::addRow(const QString &type, const QString &label, con
                 return QString();
             }
         }
-        strAddress = CBitcoinAddress(newKey.GetID()).ToString();
+        strAddress = EncodeDestination(newKey.GetID());
     }
     else
     {
@@ -394,7 +394,7 @@ QString AddressTableModel::addRow(const QString &type, const QString &label, con
     // Add entry
     {
         LOCK(wallet->cs_wallet);
-        wallet->SetAddressBook(CBitcoinAddress(strAddress).Get(), strLabel,
+        wallet->SetAddressBook(DecodeDestination(strAddress), strLabel,
                                (type == Send ? "send" : "receive"));
     }
     return QString::fromStdString(strAddress);
@@ -412,7 +412,7 @@ bool AddressTableModel::removeRows(int row, int count, const QModelIndex &parent
     }
     {
         LOCK(wallet->cs_wallet);
-        wallet->DelAddressBook(CBitcoinAddress(rec->address.toStdString()).Get());
+        wallet->DelAddressBook(DecodeDestination(rec->address.toStdString()));
     }
     return true;
 }
@@ -423,8 +423,8 @@ QString AddressTableModel::labelForAddress(const QString &address) const
 {
     {
         LOCK(wallet->cs_wallet);
-        CBitcoinAddress address_parsed(address.toStdString());
-        std::map<CTxDestination, CAddressBookData>::iterator mi = wallet->mapAddressBook.find(address_parsed.Get());
+        CTxDestination destination = DecodeDestination(address.toStdString());
+        std::map<CTxDestination, CAddressBookData>::iterator mi = wallet->mapAddressBook.find(destination);
         if (mi != wallet->mapAddressBook.end())
         {
             return QString::fromStdString(mi->second.name);
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 4a4116c67..3fd58a2f9 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -106,7 +106,7 @@ static QString GetLangTerritory()
     if(!lang_territory_qsettings.isEmpty())
         lang_territory = lang_territory_qsettings;
     // 3) -lang command line argument
-    lang_territory = QString::fromStdString(GetArg("-lang", lang_territory.toStdString()));
+    lang_territory = QString::fromStdString(gArgs.GetArg("-lang", lang_territory.toStdString()));
     return lang_territory;
 }
 
@@ -227,7 +227,7 @@ class BitcoinApplication: public QApplication
     void requestShutdown();
 
     /// Get process return value
-    int getReturnValue() { return returnValue; }
+    int getReturnValue() const { return returnValue; }
 
     /// Get window identifier of QMainWindow (BitcoinGUI)
     WId getMainWinId() const;
@@ -305,7 +305,7 @@ void BitcoinCore::initialize()
     } catch (const std::exception& e) {
         handleRunawayException(&e);
     } catch (...) {
-        handleRunawayException(NULL);
+        handleRunawayException(nullptr);
     }
 }
 
@@ -322,7 +322,7 @@ void BitcoinCore::shutdown()
     } catch (const std::exception& e) {
         handleRunawayException(&e);
     } catch (...) {
-        handleRunawayException(NULL);
+        handleRunawayException(nullptr);
     }
 }
 
@@ -345,7 +345,7 @@ BitcoinApplication::BitcoinApplication(int &argc, char **argv):
     // This must be done inside the BitcoinApplication constructor, or after it, because
     // PlatformStyle::instantiate requires a QApplication
     std::string platformName;
-    platformName = GetArg("-uiplatform", BitcoinGUI::DEFAULT_UIPLATFORM);
+    platformName = gArgs.GetArg("-uiplatform", BitcoinGUI::DEFAULT_UIPLATFORM);
     platformStyle = PlatformStyle::instantiate(QString::fromStdString(platformName));
     if (!platformStyle) // Fall back to "other" if specified name not found
         platformStyle = PlatformStyle::instantiate("other");
@@ -383,7 +383,7 @@ void BitcoinApplication::createPaymentServer()
 
 void BitcoinApplication::createOptionsModel(bool resetSettings)
 {
-    optionsModel = new OptionsModel(NULL, resetSettings);
+    optionsModel = new OptionsModel(nullptr, resetSettings);
 }
 
 void BitcoinApplication::createWindow(const NetworkStyle *networkStyle)
@@ -498,7 +498,7 @@ void BitcoinApplication::initializeResult(bool success)
 #endif
 
         // If -min option passed, start window minimized.
-        if(GetBoolArg("-min", false))
+        if(gArgs.GetBoolArg("-min", false))
         {
             window->showMinimized();
         }
@@ -550,7 +550,7 @@ int main(int argc, char *argv[])
 
     /// 1. Parse command-line options. These take precedence over anything else.
     // Command-line options take precedence:
-    ParseParameters(argc, argv);
+    gArgs.ParseParameters(argc, argv);
 
     // Do not refer to data directory yet, this can be overridden by Intro::pickDataDirectory
 
@@ -606,9 +606,9 @@ int main(int argc, char *argv[])
 
     // Show help message immediately after parsing command-line options (for "-lang") and setting locale,
     // but before showing splash screen.
-    if (IsArgSet("-?") || IsArgSet("-h") || IsArgSet("-help") || IsArgSet("-version"))
+    if (gArgs.IsArgSet("-?") || gArgs.IsArgSet("-h") || gArgs.IsArgSet("-help") || gArgs.IsArgSet("-version"))
     {
-        HelpMessageDialog help(NULL, IsArgSet("-version"));
+        HelpMessageDialog help(nullptr, gArgs.IsArgSet("-version"));
         help.showOrPrint();
         return EXIT_SUCCESS;
     }
@@ -623,11 +623,11 @@ int main(int argc, char *argv[])
     if (!fs::is_directory(GetDataDir(false)))
     {
         QMessageBox::critical(0, QObject::tr(PACKAGE_NAME),
-                              QObject::tr("Error: Specified data directory \"%1\" does not exist.").arg(QString::fromStdString(GetArg("-datadir", ""))));
+                              QObject::tr("Error: Specified data directory \"%1\" does not exist.").arg(QString::fromStdString(gArgs.GetArg("-datadir", ""))));
         return EXIT_FAILURE;
     }
     try {
-        ReadConfigFile(GetArg("-conf", BITCOIN_CONF_FILENAME));
+        gArgs.ReadConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME));
     } catch (const std::exception& e) {
         QMessageBox::critical(0, QObject::tr(PACKAGE_NAME),
                               QObject::tr("Error: Cannot parse configuration file: %1. Only use key=value syntax.").arg(e.what()));
@@ -691,12 +691,12 @@ int main(int argc, char *argv[])
     // Allow parameter interaction before we create the options model
     app.parameterSetup();
     // Load GUI settings from QSettings
-    app.createOptionsModel(IsArgSet("-resetguisettings"));
+    app.createOptionsModel(gArgs.IsArgSet("-resetguisettings"));
 
     // Subscribe to global signals from core
     uiInterface.InitMessage.connect(InitMessage);
 
-    if (GetBoolArg("-splash", DEFAULT_SPLASHSCREEN) && !GetBoolArg("-min", false))
+    if (gArgs.GetBoolArg("-splash", DEFAULT_SPLASHSCREEN) && !gArgs.GetBoolArg("-min", false))
         app.createSplashScreen(networkStyle.data());
 
     int rv = EXIT_SUCCESS;
@@ -723,7 +723,7 @@ int main(int argc, char *argv[])
         PrintExceptionContinue(&e, "Runaway exception");
         app.handleRunawayException(QString::fromStdString(GetWarnings("gui")));
     } catch (...) {
-        PrintExceptionContinue(NULL, "Runaway exception");
+        PrintExceptionContinue(nullptr, "Runaway exception");
         app.handleRunawayException(QString::fromStdString(GetWarnings("gui")));
     }
     return rv;
diff --git a/src/qt/bitcoinaddressvalidator.cpp b/src/qt/bitcoinaddressvalidator.cpp
index d712705c4..362a71f04 100644
--- a/src/qt/bitcoinaddressvalidator.cpp
+++ b/src/qt/bitcoinaddressvalidator.cpp
@@ -67,7 +67,7 @@ QValidator::State BitcoinAddressEntryValidator::validate(QString &input, int &po
         if (((ch >= '0' && ch<='9') ||
             (ch >= 'a' && ch<='z') ||
             (ch >= 'A' && ch<='Z')) &&
-            ch != 'l' && ch != 'I' && ch != '0' && ch != 'O')
+            ch != 'I' && ch != 'O') // Characters invalid in both Base58 and Bech32
         {
             // Alphanumeric and not a 'forbidden' character
         }
@@ -89,9 +89,9 @@ QValidator::State BitcoinAddressCheckValidator::validate(QString &input, int &po
 {
     Q_UNUSED(pos);
     // Validate the passed Bitcoin address
-    CBitcoinAddress addr(input.toStdString());
-    if (addr.IsValid())
+    if (IsValidDestinationString(input.toStdString())) {
         return QValidator::Acceptable;
+    }
 
     return QValidator::Invalid;
 }
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 429c18cba..dc5514190 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -123,7 +123,11 @@ BitcoinGUI::BitcoinGUI(const PlatformStyle *_platformStyle, const NetworkStyle *
     spinnerFrame(0),
     platformStyle(_platformStyle)
 {
-    GUIUtil::restoreWindowGeometry("nWindow", QSize(850, 550), this);
+    QSettings settings;
+    if (!restoreGeometry(settings.value("MainWindowGeometry").toByteArray())) {
+        // Restore failed (perhaps missing setting), center the window
+        move(QApplication::desktop()->availableGeometry().center() - frameGeometry().center());
+    }
 
     QString windowTitle = tr(PACKAGE_NAME) + " - ";
 #ifdef ENABLE_WALLET
@@ -261,7 +265,8 @@ BitcoinGUI::~BitcoinGUI()
     // Unsubscribe from notifications from core
     unsubscribeFromCoreSignals();
 
-    GUIUtil::saveWindowGeometry("nWindow", this);
+    QSettings settings;
+    settings.setValue("MainWindowGeometry", saveGeometry());
     if(trayIcon) // Hide tray icon, as deleting will let it linger until quit (on Ubuntu)
         trayIcon->hide();
 #ifdef Q_OS_MAC
@@ -454,6 +459,7 @@ void BitcoinGUI::createToolBars()
     if(walletFrame)
     {
         QToolBar *toolbar = addToolBar(tr("Tabs toolbar"));
+        toolbar->setContextMenuPolicy(Qt::PreventContextMenu);
         toolbar->setMovable(false);
         toolbar->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
         toolbar->addAction(overviewAction);
@@ -479,7 +485,7 @@ void BitcoinGUI::setClientModel(ClientModel *_clientModel)
         connect(_clientModel, SIGNAL(networkActiveChanged(bool)), this, SLOT(setNetworkActive(bool)));
 
         modalOverlay->setKnownBestHeight(_clientModel->getHeaderTipHeight(), QDateTime::fromTime_t(_clientModel->getHeaderTipTime()));
-        setNumBlocks(_clientModel->getNumBlocks(), _clientModel->getLastBlockDate(), _clientModel->getVerificationProgress(NULL), false);
+        setNumBlocks(_clientModel->getNumBlocks(), _clientModel->getLastBlockDate(), _clientModel->getVerificationProgress(nullptr), false);
         connect(_clientModel, SIGNAL(numBlocksChanged(int,QDateTime,double,bool)), this, SLOT(setNumBlocks(int,QDateTime,double,bool)));
 
         // Receive and report messages from client model
@@ -922,7 +928,7 @@ void BitcoinGUI::message(const QString &title, const QString &message, unsigned
         showNormalIfMinimized();
         QMessageBox mBox((QMessageBox::Icon)nMBoxIcon, strTitle, message, buttons, this);
         int r = mBox.exec();
-        if (ret != NULL)
+        if (ret != nullptr)
             *ret = r == QMessageBox::Ok;
     }
     else
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index 8731caafc..aa45ea1f0 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -168,7 +168,7 @@ public Q_SLOTS:
                             @see CClientUIInterface::MessageBoxFlags
        @param[in] ret       pointer to a bool that will be modified to whether Ok was clicked (modal only)
     */
-    void message(const QString &title, const QString &message, unsigned int style, bool *ret = NULL);
+    void message(const QString &title, const QString &message, unsigned int style, bool *ret = nullptr);
 
 #ifdef ENABLE_WALLET
     /** Set the encryption status as shown in the UI.
diff --git a/src/qt/callback.h b/src/qt/callback.h
index a8b593a65..da6b0c4c2 100644
--- a/src/qt/callback.h
+++ b/src/qt/callback.h
@@ -16,7 +16,7 @@ class FunctionCallback : public Callback
     F f;
 
 public:
-    FunctionCallback(F f_) : f(std::move(f_)) {}
+    explicit FunctionCallback(F f_) : f(std::move(f_)) {}
     ~FunctionCallback() override {}
     void call() override { f(this); }
 };
diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
index f3ee0fbe3..207e441b6 100644
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -18,6 +18,7 @@
 #include "policy/fees.h"
 #include "policy/policy.h"
 #include "validation.h" // For mempool
+#include "wallet/fees.h"
 #include "wallet/wallet.h"
 
 #include <QApplication>
@@ -510,7 +511,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
                 nBytes -= 34;
 
         // Fee
-        nPayFee = CWallet::GetMinimumFee(nBytes, *coinControl, ::mempool, ::feeEstimator, nullptr /* FeeCalculation */);
+        nPayFee = GetMinimumFee(nBytes, *coinControl, ::mempool, ::feeEstimator, nullptr /* FeeCalculation */);
 
         if (nPayAmount > 0)
         {
@@ -581,7 +582,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
     QString toolTipDust = tr("This label turns red if any recipient receives an amount smaller than the current dust threshold.");
 
     // how many satoshis the estimated fee can vary per byte we guess wrong
-    double dFeeVary = (double)nPayFee / nBytes;
+    double dFeeVary = (nBytes != 0) ? (double)nPayFee / nBytes : 0;
 
     QString toolTip4 = tr("Can vary +/- %1 satoshi(s) per input.").arg(dFeeVary);
 
@@ -659,7 +660,7 @@ void CoinControlDialog::updateView()
             QString sAddress = "";
             if(ExtractDestination(out.tx->tx->vout[out.i].scriptPubKey, outputAddress))
             {
-                sAddress = QString::fromStdString(CBitcoinAddress(outputAddress).ToString());
+                sAddress = QString::fromStdString(EncodeDestination(outputAddress));
 
                 // if listMode or change => show bitcoin address. In tree mode, address is not shown again for direct wallet address outputs
                 if (!treeMode || (!(sAddress == sWalletAddress)))
diff --git a/src/qt/coincontroldialog.h b/src/qt/coincontroldialog.h
index 99a9f893f..4949c9177 100644
--- a/src/qt/coincontroldialog.h
+++ b/src/qt/coincontroldialog.h
@@ -30,9 +30,9 @@ namespace Ui {
 class CCoinControlWidgetItem : public QTreeWidgetItem
 {
 public:
-    CCoinControlWidgetItem(QTreeWidget *parent, int type = Type) : QTreeWidgetItem(parent, type) {}
-    CCoinControlWidgetItem(int type = Type) : QTreeWidgetItem(type) {}
-    CCoinControlWidgetItem(QTreeWidgetItem *parent, int type = Type) : QTreeWidgetItem(parent, type) {}
+    explicit CCoinControlWidgetItem(QTreeWidget *parent, int type = Type) : QTreeWidgetItem(parent, type) {}
+    explicit CCoinControlWidgetItem(int type = Type) : QTreeWidgetItem(type) {}
+    explicit CCoinControlWidgetItem(QTreeWidgetItem *parent, int type = Type) : QTreeWidgetItem(parent, type) {}
 
     bool operator<(const QTreeWidgetItem &other) const;
 };
diff --git a/src/qt/forms/optionsdialog.ui b/src/qt/forms/optionsdialog.ui
index 14078b9ee..e31bfee05 100644
--- a/src/qt/forms/optionsdialog.ui
+++ b/src/qt/forms/optionsdialog.ui
@@ -199,10 +199,10 @@
        <item>
         <widget class="QCheckBox" name="allowIncoming">
          <property name="toolTip">
-          <string>Accept connections from outside</string>
+          <string>Accept connections from outside.</string>
          </property>
          <property name="text">
-          <string>Allow incoming connections</string>
+          <string>Allow incomin&amp;g connections</string>
          </property>
         </widget>
        </item>
@@ -399,7 +399,7 @@
           <string>Connect to the Bitcoin network through a separate SOCKS5 proxy for Tor hidden services.</string>
          </property>
          <property name="text">
-          <string>Use separate SOCKS5 proxy to reach peers via Tor hidden services:</string>
+          <string>Use separate SOCKS&amp;5 proxy to reach peers via Tor hidden services:</string>
          </property>
         </widget>
        </item>
@@ -507,10 +507,10 @@
        <item>
         <widget class="QCheckBox" name="hideTrayIcon">
          <property name="toolTip">
-          <string>&amp;Hide the icon from the system tray.</string>
+          <string>Hide the icon from the system tray.</string>
          </property>
          <property name="text">
-          <string>Hide tray icon</string>
+          <string>&amp;Hide tray icon</string>
          </property>
         </widget>
        </item>
@@ -610,7 +610,7 @@
             <string>Third party URLs (e.g. a block explorer) that appear in the transactions tab as context menu items. %s in the URL is replaced by transaction hash. Multiple URLs are separated by vertical bar |.</string>
            </property>
            <property name="text">
-            <string>Third party transaction URLs</string>
+            <string>&amp;Third party transaction URLs</string>
            </property>
            <property name="buddy">
             <cstring>thirdPartyTxUrls</cstring>
diff --git a/src/qt/forms/sendcoinsdialog.ui b/src/qt/forms/sendcoinsdialog.ui
index 1e2f2302b..a0e48334c 100644
--- a/src/qt/forms/sendcoinsdialog.ui
+++ b/src/qt/forms/sendcoinsdialog.ui
@@ -846,19 +846,13 @@
                <item>
                 <layout class="QHBoxLayout" name="horizontalLayoutFee13">
                  <item>
-                  <widget class="QRadioButton" name="radioCustomPerKilobyte">
+                  <widget class="QLabel" name="labelCustomPerKilobyte">
                    <property name="toolTip">
                     <string>If the custom fee is set to 1000 satoshis and the transaction is only 250 bytes, then &quot;per kilobyte&quot; only pays 250 satoshis in fee, while &quot;total at least&quot; pays 1000 satoshis. For transactions bigger than a kilobyte both pay by kilobyte.</string>
                    </property>
                    <property name="text">
                     <string>per kilobyte</string>
                    </property>
-                   <property name="checked">
-                    <bool>true</bool>
-                   </property>
-                   <attribute name="buttonGroup">
-                    <string notr="true">groupCustomFee</string>
-                   </attribute>
                   </widget>
                  </item>
                  <item>
@@ -1285,6 +1279,5 @@
  <connections/>
  <buttongroups>
   <buttongroup name="groupFee"/>
-  <buttongroup name="groupCustomFee"/>
  </buttongroups>
 </ui>
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index bffa81137..4bd63f464 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -112,8 +112,9 @@ static std::string DummyAddress(const CChainParams &params)
     sourcedata.insert(sourcedata.end(), dummydata, dummydata + sizeof(dummydata));
     for(int i=0; i<256; ++i) { // Try every trailing byte
         std::string s = EncodeBase58(sourcedata.data(), sourcedata.data() + sourcedata.size());
-        if (!CBitcoinAddress(s).IsValid())
+        if (!IsValidDestinationString(s)) {
             return s;
+        }
         sourcedata[sourcedata.size()-1] += 1;
     }
     return "";
@@ -248,7 +249,7 @@ QString formatBitcoinURI(const SendCoinsRecipient &info)
 
 bool isDust(const QString& address, const CAmount& amount)
 {
-    CTxDestination dest = CBitcoinAddress(address.toStdString()).Get();
+    CTxDestination dest = DecodeDestination(address.toStdString());
     CScript script = GetScriptForDestination(dest);
     CTxOut txOut(amount, script);
     return IsDust(txOut, ::dustRelayFee);
@@ -634,11 +635,11 @@ bool SetStartOnSystemStartup(bool fAutoStart)
 
     if (fAutoStart)
     {
-        CoInitialize(NULL);
+        CoInitialize(nullptr);
 
         // Get a pointer to the IShellLink interface.
-        IShellLink* psl = NULL;
-        HRESULT hres = CoCreateInstance(CLSID_ShellLink, NULL,
+        IShellLink* psl = nullptr;
+        HRESULT hres = CoCreateInstance(CLSID_ShellLink, nullptr,
             CLSCTX_INPROC_SERVER, IID_IShellLink,
             reinterpret_cast<void**>(&psl));
 
@@ -646,12 +647,12 @@ bool SetStartOnSystemStartup(bool fAutoStart)
         {
             // Get the current executable path
             TCHAR pszExePath[MAX_PATH];
-            GetModuleFileName(NULL, pszExePath, sizeof(pszExePath));
+            GetModuleFileName(nullptr, pszExePath, sizeof(pszExePath));
 
             // Start client minimized
             QString strArgs = "-min";
             // Set -testnet /-regtest options
-            strArgs += QString::fromStdString(strprintf(" -testnet=%d -regtest=%d", GetBoolArg("-testnet", false), GetBoolArg("-regtest", false)));
+            strArgs += QString::fromStdString(strprintf(" -testnet=%d -regtest=%d", gArgs.GetBoolArg("-testnet", false), gArgs.GetBoolArg("-regtest", false)));
 
 #ifdef UNICODE
             boost::scoped_array<TCHAR> args(new TCHAR[strArgs.length() + 1]);
@@ -674,7 +675,7 @@ bool SetStartOnSystemStartup(bool fAutoStart)
 
             // Query IShellLink for the IPersistFile interface for
             // saving the shortcut in persistent storage.
-            IPersistFile* ppf = NULL;
+            IPersistFile* ppf = nullptr;
             hres = psl->QueryInterface(IID_IPersistFile, reinterpret_cast<void**>(&ppf));
             if (SUCCEEDED(hres))
             {
@@ -743,9 +744,10 @@ bool SetStartOnSystemStartup(bool fAutoStart)
     else
     {
         char pszExePath[MAX_PATH+1];
-        memset(pszExePath, 0, sizeof(pszExePath));
-        if (readlink("/proc/self/exe", pszExePath, sizeof(pszExePath)-1) == -1)
+        ssize_t r = readlink("/proc/self/exe", pszExePath, sizeof(pszExePath) - 1);
+        if (r == -1)
             return false;
+        pszExePath[r] = '\0';
 
         fs::create_directories(GetAutostartDir());
 
@@ -760,7 +762,7 @@ bool SetStartOnSystemStartup(bool fAutoStart)
             optionFile << "Name=Bitcoin\n";
         else
             optionFile << strprintf("Name=Bitcoin (%s)\n", chain);
-        optionFile << "Exec=" << pszExePath << strprintf(" -min -testnet=%d -regtest=%d\n", GetBoolArg("-testnet", false), GetBoolArg("-regtest", false));
+        optionFile << "Exec=" << pszExePath << strprintf(" -min -testnet=%d -regtest=%d\n", gArgs.GetBoolArg("-testnet", false), gArgs.GetBoolArg("-regtest", false));
         optionFile << "Terminal=false\n";
         optionFile << "Hidden=false\n";
         optionFile.close();
@@ -780,58 +782,77 @@ bool SetStartOnSystemStartup(bool fAutoStart)
 LSSharedFileListItemRef findStartupItemInList(LSSharedFileListRef list, CFURLRef findUrl);
 LSSharedFileListItemRef findStartupItemInList(LSSharedFileListRef list, CFURLRef findUrl)
 {
+    CFArrayRef listSnapshot = LSSharedFileListCopySnapshot(list, nullptr);
+    if (listSnapshot == nullptr) {
+        return nullptr;
+    }
+    
     // loop through the list of startup items and try to find the bitcoin app
-    CFArrayRef listSnapshot = LSSharedFileListCopySnapshot(list, NULL);
     for(int i = 0; i < CFArrayGetCount(listSnapshot); i++) {
         LSSharedFileListItemRef item = (LSSharedFileListItemRef)CFArrayGetValueAtIndex(listSnapshot, i);
         UInt32 resolutionFlags = kLSSharedFileListNoUserInteraction | kLSSharedFileListDoNotMountVolumes;
-        CFURLRef currentItemURL = NULL;
+        CFURLRef currentItemURL = nullptr;
 
 #if defined(MAC_OS_X_VERSION_MAX_ALLOWED) && MAC_OS_X_VERSION_MAX_ALLOWED >= 10100
-    if(&LSSharedFileListItemCopyResolvedURL)
-        currentItemURL = LSSharedFileListItemCopyResolvedURL(item, resolutionFlags, NULL);
+        if(&LSSharedFileListItemCopyResolvedURL)
+            currentItemURL = LSSharedFileListItemCopyResolvedURL(item, resolutionFlags, nullptr);
 #if defined(MAC_OS_X_VERSION_MIN_REQUIRED) && MAC_OS_X_VERSION_MIN_REQUIRED < 10100
-    else
-        LSSharedFileListItemResolve(item, resolutionFlags, &currentItemURL, NULL);
+        else
+            LSSharedFileListItemResolve(item, resolutionFlags, &currentItemURL, nullptr);
 #endif
 #else
-    LSSharedFileListItemResolve(item, resolutionFlags, &currentItemURL, NULL);
+        LSSharedFileListItemResolve(item, resolutionFlags, &currentItemURL, nullptr);
 #endif
 
-        if(currentItemURL && CFEqual(currentItemURL, findUrl)) {
-            // found
-            CFRelease(currentItemURL);
-            return item;
-        }
         if(currentItemURL) {
+            if (CFEqual(currentItemURL, findUrl)) {
+                // found
+                CFRelease(listSnapshot);
+                CFRelease(currentItemURL);
+                return item;
+            }
             CFRelease(currentItemURL);
         }
     }
-    return NULL;
+    
+    CFRelease(listSnapshot);
+    return nullptr;
 }
 
 bool GetStartOnSystemStartup()
 {
     CFURLRef bitcoinAppUrl = CFBundleCopyBundleURL(CFBundleGetMainBundle());
-    LSSharedFileListRef loginItems = LSSharedFileListCreate(NULL, kLSSharedFileListSessionLoginItems, NULL);
+    if (bitcoinAppUrl == nullptr) {
+        return false;
+    }
+    
+    LSSharedFileListRef loginItems = LSSharedFileListCreate(nullptr, kLSSharedFileListSessionLoginItems, nullptr);
     LSSharedFileListItemRef foundItem = findStartupItemInList(loginItems, bitcoinAppUrl);
+
+    CFRelease(bitcoinAppUrl);
     return !!foundItem; // return boolified object
 }
 
 bool SetStartOnSystemStartup(bool fAutoStart)
 {
     CFURLRef bitcoinAppUrl = CFBundleCopyBundleURL(CFBundleGetMainBundle());
-    LSSharedFileListRef loginItems = LSSharedFileListCreate(NULL, kLSSharedFileListSessionLoginItems, NULL);
+    if (bitcoinAppUrl == nullptr) {
+        return false;
+    }
+    
+    LSSharedFileListRef loginItems = LSSharedFileListCreate(nullptr, kLSSharedFileListSessionLoginItems, nullptr);
     LSSharedFileListItemRef foundItem = findStartupItemInList(loginItems, bitcoinAppUrl);
 
     if(fAutoStart && !foundItem) {
         // add bitcoin app to startup item list
-        LSSharedFileListInsertItemURL(loginItems, kLSSharedFileListItemBeforeFirst, NULL, NULL, bitcoinAppUrl, NULL, NULL);
+        LSSharedFileListInsertItemURL(loginItems, kLSSharedFileListItemBeforeFirst, nullptr, nullptr, bitcoinAppUrl, nullptr, nullptr);
     }
     else if(!fAutoStart && foundItem) {
         // remove item
         LSSharedFileListItemRemove(loginItems, foundItem);
     }
+    
+    CFRelease(bitcoinAppUrl);
     return true;
 }
 #pragma GCC diagnostic pop
@@ -842,32 +863,6 @@ bool SetStartOnSystemStartup(bool fAutoStart) { return false; }
 
 #endif
 
-void saveWindowGeometry(const QString& strSetting, QWidget *parent)
-{
-    QSettings settings;
-    settings.setValue(strSetting + "Pos", parent->pos());
-    settings.setValue(strSetting + "Size", parent->size());
-}
-
-void restoreWindowGeometry(const QString& strSetting, const QSize& defaultSize, QWidget *parent)
-{
-    QSettings settings;
-    QPoint pos = settings.value(strSetting + "Pos").toPoint();
-    QSize size = settings.value(strSetting + "Size", defaultSize).toSize();
-
-    parent->resize(size);
-    parent->move(pos);
-
-    if ((!pos.x() && !pos.y()) || (QApplication::desktop()->screenNumber(parent) == -1))
-    {
-        QRect screen = QApplication::desktop()->screenGeometry();
-        QPoint defaultPos((screen.width() - defaultSize.width()) / 2,
-                          (screen.height() - defaultSize.height()) / 2);
-        parent->resize(defaultSize);
-        parent->move(defaultPos);
-    }
-}
-
 void setClipboard(const QString& str)
 {
     QApplication::clipboard()->setText(str, QClipboard::Clipboard);
@@ -989,6 +984,18 @@ QString formatNiceTimeOffset(qint64 secs)
     return timeBehindText;
 }
 
+QString formatBytes(uint64_t bytes)
+{
+    if(bytes < 1024)
+        return QString(QObject::tr("%1 B")).arg(bytes);
+    if(bytes < 1024 * 1024)
+        return QString(QObject::tr("%1 KB")).arg(bytes / 1024);
+    if(bytes < 1024 * 1024 * 1024)
+        return QString(QObject::tr("%1 MB")).arg(bytes / 1024 / 1024);
+
+    return QString(QObject::tr("%1 GB")).arg(bytes / 1024 / 1024 / 1024);
+}
+
 void ClickableLabel::mouseReleaseEvent(QMouseEvent *event)
 {
     Q_EMIT clicked(event->pos());
diff --git a/src/qt/guiutil.h b/src/qt/guiutil.h
index d6aa8c4ea..7622816f7 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -179,11 +179,6 @@ namespace GUIUtil
     bool GetStartOnSystemStartup();
     bool SetStartOnSystemStartup(bool fAutoStart);
 
-    /** Save window size and position */
-    void saveWindowGeometry(const QString& strSetting, QWidget *parent);
-    /** Restore window size and position */
-    void restoreWindowGeometry(const QString& strSetting, const QSize &defaultSizeIn, QWidget *parent);
-
     /* Convert QString to OS specific boost path through UTF-8 */
     fs::path qstringToBoostPath(const QString &path);
 
@@ -204,6 +199,8 @@ namespace GUIUtil
 
     QString formatNiceTimeOffset(qint64 secs);
 
+    QString formatBytes(uint64_t bytes);
+
     class ClickableLabel : public QLabel
     {
         Q_OBJECT
diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index 231a71575..0ff95d850 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -43,7 +43,7 @@ class FreespaceChecker : public QObject
     Q_OBJECT
 
 public:
-    FreespaceChecker(Intro *intro);
+    explicit FreespaceChecker(Intro *intro);
 
     enum Status {
         ST_OK,
@@ -131,7 +131,7 @@ Intro::Intro(QWidget *parent) :
     );
     ui->lblExplanation2->setText(ui->lblExplanation2->text().arg(tr(PACKAGE_NAME)));
 
-    uint64_t pruneTarget = std::max<int64_t>(0, GetArg("-prune", 0));
+    uint64_t pruneTarget = std::max<int64_t>(0, gArgs.GetArg("-prune", 0));
     requiredSpace = BLOCK_CHAIN_SIZE;
     QString storageRequiresMsg = tr("At least %1 GB of data will be stored in this directory, and it will grow over time.");
     if (pruneTarget) {
@@ -191,14 +191,14 @@ bool Intro::pickDataDirectory()
     QSettings settings;
     /* If data directory provided on command line, no need to look at settings
        or show a picking dialog */
-    if(!GetArg("-datadir", "").empty())
+    if(!gArgs.GetArg("-datadir", "").empty())
         return true;
     /* 1) Default data directory for operating system */
     QString dataDir = getDefaultDataDirectory();
     /* 2) Allow QSettings to override default dir */
     dataDir = settings.value("strDataDir", dataDir).toString();
 
-    if(!fs::exists(GUIUtil::qstringToBoostPath(dataDir)) || GetBoolArg("-choosedatadir", DEFAULT_CHOOSE_DATADIR) || settings.value("fReset", false).toBool() || GetBoolArg("-resetguisettings", false))
+    if(!fs::exists(GUIUtil::qstringToBoostPath(dataDir)) || gArgs.GetBoolArg("-choosedatadir", DEFAULT_CHOOSE_DATADIR) || settings.value("fReset", false).toBool() || gArgs.GetBoolArg("-resetguisettings", false))
     {
         /* If current default data directory does not exist, let the user choose one */
         Intro intro;
@@ -231,7 +231,7 @@ bool Intro::pickDataDirectory()
      * (to be consistent with bitcoind behavior)
      */
     if(dataDir != getDefaultDataDirectory())
-        SoftSetArg("-datadir", GUIUtil::qstringToBoostPath(dataDir).string()); // use OS locale for path setting
+        gArgs.SoftSetArg("-datadir", GUIUtil::qstringToBoostPath(dataDir).string()); // use OS locale for path setting
     return true;
 }
 
diff --git a/src/qt/macdockiconhandler.mm b/src/qt/macdockiconhandler.mm
index a41d39d51..9e7de0f98 100644
--- a/src/qt/macdockiconhandler.mm
+++ b/src/qt/macdockiconhandler.mm
@@ -18,7 +18,7 @@
 extern void qt_mac_set_dock_menu(QMenu *);
 #endif
 
-static MacDockIconHandler *s_instance = NULL;
+static MacDockIconHandler *s_instance = nullptr;
 
 bool dockClickHandler(id self,SEL _cmd,...) {
     Q_UNUSED(self)
@@ -34,7 +34,7 @@ void setupDockClickHandler() {
     Class cls = objc_getClass("NSApplication");
     id appInst = objc_msgSend((id)cls, sel_registerName("sharedApplication"));
     
-    if (appInst != NULL) {
+    if (appInst != nullptr) {
         id delegate = objc_msgSend(appInst, sel_registerName("delegate"));
         Class delClass = (Class)objc_msgSend(delegate,  sel_registerName("class"));
         SEL shouldHandle = sel_registerName("applicationShouldHandleReopen:hasVisibleWindows:");
@@ -53,7 +53,7 @@ void setupDockClickHandler() {
     setupDockClickHandler();
     this->m_dummyWidget = new QWidget();
     this->m_dockMenu = new QMenu(this->m_dummyWidget);
-    this->setMainWindow(NULL);
+    this->setMainWindow(nullptr);
 #if QT_VERSION < 0x050000
     qt_mac_set_dock_menu(this->m_dockMenu);
 #elif QT_VERSION >= 0x050200
@@ -69,7 +69,7 @@ void setupDockClickHandler() {
 MacDockIconHandler::~MacDockIconHandler()
 {
     delete this->m_dummyWidget;
-    this->setMainWindow(NULL);
+    this->setMainWindow(nullptr);
 }
 
 QMenu *MacDockIconHandler::dockMenu()
diff --git a/src/qt/macnotificationhandler.h b/src/qt/macnotificationhandler.h
index d4749b3d5..3a005c3c4 100644
--- a/src/qt/macnotificationhandler.h
+++ b/src/qt/macnotificationhandler.h
@@ -7,20 +7,17 @@
 
 #include <QObject>
 
-/** Macintosh-specific notification handler (supports UserNotificationCenter and Growl).
+/** Macintosh-specific notification handler (supports UserNotificationCenter).
  */
 class MacNotificationHandler : public QObject
 {
     Q_OBJECT
 
 public:
-    /** shows a 10.8+ UserNotification in the UserNotificationCenter
+    /** shows a macOS 10.8+ UserNotification in the UserNotificationCenter
      */
     void showNotification(const QString &title, const QString &text);
 
-    /** executes AppleScript */
-    void sendAppleScript(const QString &script);
-
     /** check if OS can handle UserNotifications */
     bool hasUserNotificationCenterSupport(void);
     static MacNotificationHandler *instance();
diff --git a/src/qt/macnotificationhandler.mm b/src/qt/macnotificationhandler.mm
index dd3f62281..1b16c5f52 100644
--- a/src/qt/macnotificationhandler.mm
+++ b/src/qt/macnotificationhandler.mm
@@ -47,20 +47,6 @@ - (NSString *)__bundleIdentifier
     }
 }
 
-// sendAppleScript just take a QString and executes it as apple script
-void MacNotificationHandler::sendAppleScript(const QString &script)
-{
-    QByteArray utf8 = script.toUtf8();
-    char* cString = (char *)utf8.constData();
-    NSString *scriptApple = [[NSString alloc] initWithUTF8String:cString];
-
-    NSAppleScript *as = [[NSAppleScript alloc] initWithSource:scriptApple];
-    NSDictionary *err = nil;
-    [as executeAndReturnError:&err];
-    [as release];
-    [scriptApple release];
-}
-
 bool MacNotificationHandler::hasUserNotificationCenterSupport(void)
 {
     Class possibleClass = NSClassFromString(@"NSUserNotificationCenter");
@@ -75,7 +61,7 @@ - (NSString *)__bundleIdentifier
 
 MacNotificationHandler *MacNotificationHandler::instance()
 {
-    static MacNotificationHandler *s_instance = NULL;
+    static MacNotificationHandler *s_instance = nullptr;
     if (!s_instance) {
         s_instance = new MacNotificationHandler();
         
diff --git a/src/qt/modaloverlay.cpp b/src/qt/modaloverlay.cpp
index a83f28503..e32a0bdda 100644
--- a/src/qt/modaloverlay.cpp
+++ b/src/qt/modaloverlay.cpp
@@ -82,36 +82,38 @@ void ModalOverlay::tipUpdate(int count, const QDateTime& blockDate, double nVeri
     blockProcessTime.push_front(qMakePair(currentDate.toMSecsSinceEpoch(), nVerificationProgress));
 
     // show progress speed if we have more then one sample
-    if (blockProcessTime.size() >= 2)
-    {
-        double progressStart = blockProcessTime[0].second;
+    if (blockProcessTime.size() >= 2) {
         double progressDelta = 0;
         double progressPerHour = 0;
         qint64 timeDelta = 0;
         qint64 remainingMSecs = 0;
         double remainingProgress = 1.0 - nVerificationProgress;
-        for (int i = 1; i < blockProcessTime.size(); i++)
-        {
+        for (int i = 1; i < blockProcessTime.size(); i++) {
             QPair<qint64, double> sample = blockProcessTime[i];
 
             // take first sample after 500 seconds or last available one
             if (sample.first < (currentDate.toMSecsSinceEpoch() - 500 * 1000) || i == blockProcessTime.size() - 1) {
-                progressDelta = progressStart-sample.second;
+                progressDelta = blockProcessTime[0].second - sample.second;
                 timeDelta = blockProcessTime[0].first - sample.first;
-                progressPerHour = progressDelta/(double)timeDelta*1000*3600;
-                remainingMSecs = remainingProgress / progressDelta * timeDelta;
+                progressPerHour = progressDelta / (double) timeDelta * 1000 * 3600;
+                remainingMSecs = (progressDelta > 0) ? remainingProgress / progressDelta * timeDelta : -1;
                 break;
             }
         }
         // show progress increase per hour
-        ui->progressIncreasePerH->setText(QString::number(progressPerHour*100, 'f', 2)+"%");
+        ui->progressIncreasePerH->setText(QString::number(progressPerHour * 100, 'f', 2)+"%");
 
         // show expected remaining time
-        ui->expectedTimeLeft->setText(GUIUtil::formatNiceTimeOffset(remainingMSecs/1000.0));
+        if(remainingMSecs >= 0) {	
+            ui->expectedTimeLeft->setText(GUIUtil::formatNiceTimeOffset(remainingMSecs / 1000.0));
+        } else {
+            ui->expectedTimeLeft->setText(QObject::tr("unknown"));
+        }
 
         static const int MAX_SAMPLES = 5000;
-        if (blockProcessTime.count() > MAX_SAMPLES)
-            blockProcessTime.remove(MAX_SAMPLES, blockProcessTime.count()-MAX_SAMPLES);
+        if (blockProcessTime.count() > MAX_SAMPLES) {
+            blockProcessTime.remove(MAX_SAMPLES, blockProcessTime.count() - MAX_SAMPLES);
+        }
     }
 
     // show the last block date
diff --git a/src/qt/modaloverlay.h b/src/qt/modaloverlay.h
index 21ccdbd83..cda23f954 100644
--- a/src/qt/modaloverlay.h
+++ b/src/qt/modaloverlay.h
@@ -32,7 +32,7 @@ public Q_SLOTS:
     // will show or hide the modal layer
     void showHide(bool hide = false, bool userRequested = false);
     void closeClicked();
-    bool isLayerVisible() { return layerIsVisible; }
+    bool isLayerVisible() const { return layerIsVisible; }
 
 protected:
     bool eventFilter(QObject * obj, QEvent * ev);
diff --git a/src/qt/networkstyle.cpp b/src/qt/networkstyle.cpp
index 93092501c..4b81c54d3 100644
--- a/src/qt/networkstyle.cpp
+++ b/src/qt/networkstyle.cpp
@@ -44,7 +44,7 @@ NetworkStyle::NetworkStyle(const QString &_appName, const int iconColorHueShift,
             // loop through pixels
             for(int x=0;x<img.width();x++)
             {
-                // preserve alpha because QColor::getHsl doesen't return the alpha value
+                // preserve alpha because QColor::getHsl doesn't return the alpha value
                 a = qAlpha(scL[x]);
                 QColor col(scL[x]);
 
diff --git a/src/qt/notificator.cpp b/src/qt/notificator.cpp
index 8718929c6..937928315 100644
--- a/src/qt/notificator.cpp
+++ b/src/qt/notificator.cpp
@@ -60,22 +60,6 @@ Notificator::Notificator(const QString &_programName, QSystemTrayIcon *_trayIcon
     if( MacNotificationHandler::instance()->hasUserNotificationCenterSupport()) {
         mode = UserNotificationCenter;
     }
-    else {
-        // Check if Growl is installed (based on Qt's tray icon implementation)
-        CFURLRef cfurl;
-        OSStatus status = LSGetApplicationForInfo(kLSUnknownType, kLSUnknownCreator, CFSTR("growlTicket"), kLSRolesAll, 0, &cfurl);
-        if (status != kLSApplicationNotFoundErr) {
-            CFBundleRef bundle = CFBundleCreate(0, cfurl);
-            if (CFStringCompare(CFBundleGetIdentifier(bundle), CFSTR("com.Growl.GrowlHelperApp"), kCFCompareCaseInsensitive | kCFCompareBackwards) == kCFCompareEqualTo) {
-                if (CFStringHasSuffix(CFURLGetString(cfurl), CFSTR("/Growl.app/")))
-                    mode = Growl13;
-                else
-                    mode = Growl12;
-            }
-            CFRelease(cfurl);
-            CFRelease(bundle);
-        }
-    }
 #endif
 }
 
@@ -93,7 +77,7 @@ class FreedesktopImage
 {
 public:
     FreedesktopImage() {}
-    FreedesktopImage(const QImage &img);
+    explicit FreedesktopImage(const QImage &img);
 
     static int metaType();
 
@@ -241,52 +225,6 @@ void Notificator::notifySystray(Class cls, const QString &title, const QString &
 
 // Based on Qt's tray icon implementation
 #ifdef Q_OS_MAC
-void Notificator::notifyGrowl(Class cls, const QString &title, const QString &text, const QIcon &icon)
-{
-    const QString script(
-        "tell application \"%5\"\n"
-        "  set the allNotificationsList to {\"Notification\"}\n" // -- Make a list of all the notification types (all)
-        "  set the enabledNotificationsList to {\"Notification\"}\n" // -- Make a list of the notifications (enabled)
-        "  register as application \"%1\" all notifications allNotificationsList default notifications enabledNotificationsList\n" // -- Register our script with Growl
-        "  notify with name \"Notification\" title \"%2\" description \"%3\" application name \"%1\"%4\n" // -- Send a Notification
-        "end tell"
-    );
-
-    QString notificationApp(QApplication::applicationName());
-    if (notificationApp.isEmpty())
-        notificationApp = "Application";
-
-    QPixmap notificationIconPixmap;
-    if (icon.isNull()) { // If no icon specified, set icon based on class
-        QStyle::StandardPixmap sicon = QStyle::SP_MessageBoxQuestion;
-        switch (cls)
-        {
-        case Information: sicon = QStyle::SP_MessageBoxInformation; break;
-        case Warning: sicon = QStyle::SP_MessageBoxWarning; break;
-        case Critical: sicon = QStyle::SP_MessageBoxCritical; break;
-        }
-        notificationIconPixmap = QApplication::style()->standardPixmap(sicon);
-    }
-    else {
-        QSize size = icon.actualSize(QSize(48, 48));
-        notificationIconPixmap = icon.pixmap(size);
-    }
-
-    QString notificationIcon;
-    QTemporaryFile notificationIconFile;
-    if (!notificationIconPixmap.isNull() && notificationIconFile.open()) {
-        QImageWriter writer(&notificationIconFile, "PNG");
-        if (writer.write(notificationIconPixmap.toImage()))
-            notificationIcon = QString(" image from location \"file://%1\"").arg(notificationIconFile.fileName());
-    }
-
-    QString quotedTitle(title), quotedText(text);
-    quotedTitle.replace("\\", "\\\\").replace("\"", "\\");
-    quotedText.replace("\\", "\\\\").replace("\"", "\\");
-    QString growlApp(this->mode == Notificator::Growl13 ? "Growl" : "GrowlHelperApp");
-    MacNotificationHandler::instance()->sendAppleScript(script.arg(notificationApp, quotedTitle, quotedText, notificationIcon, growlApp));
-}
-
 void Notificator::notifyMacUserNotificationCenter(Class cls, const QString &title, const QString &text, const QIcon &icon) {
     // icon is not supported by the user notification center yet. OSX will use the app icon.
     MacNotificationHandler::instance()->showNotification(title, text);
@@ -310,10 +248,6 @@ void Notificator::notify(Class cls, const QString &title, const QString &text, c
     case UserNotificationCenter:
         notifyMacUserNotificationCenter(cls, title, text, icon);
         break;
-    case Growl12:
-    case Growl13:
-        notifyGrowl(cls, title, text, icon);
-        break;
 #endif
     default:
         if(cls == Critical)
diff --git a/src/qt/notificator.h b/src/qt/notificator.h
index f92b791d4..67f2b1df6 100644
--- a/src/qt/notificator.h
+++ b/src/qt/notificator.h
@@ -58,8 +58,6 @@ public Q_SLOTS:
         None,                       /**< Ignore informational notifications, and show a modal pop-up dialog for Critical notifications. */
         Freedesktop,                /**< Use DBus org.freedesktop.Notifications */
         QSystemTray,                /**< Use QSystemTray::showMessage */
-        Growl12,                    /**< Use the Growl 1.2 notification system (Mac only) */
-        Growl13,                    /**< Use the Growl 1.3 notification system (Mac only) */
         UserNotificationCenter      /**< Use the 10.8+ User Notification Center (Mac only) */
     };
     QString programName;
@@ -72,7 +70,6 @@ public Q_SLOTS:
 #endif
     void notifySystray(Class cls, const QString &title, const QString &text, const QIcon &icon, int millisTimeout);
 #ifdef Q_OS_MAC
-    void notifyGrowl(Class cls, const QString &title, const QString &text, const QIcon &icon);
     void notifyMacUserNotificationCenter(Class cls, const QString &title, const QString &text, const QIcon &icon);
 #endif
 };
diff --git a/src/qt/openuridialog.cpp b/src/qt/openuridialog.cpp
index 5a6616134..3ee656d47 100644
--- a/src/qt/openuridialog.cpp
+++ b/src/qt/openuridialog.cpp
@@ -44,7 +44,7 @@ void OpenURIDialog::accept()
 
 void OpenURIDialog::on_selectFileButton_clicked()
 {
-    QString filename = GUIUtil::getOpenFileName(this, tr("Select payment request file to open"), "", "", NULL);
+    QString filename = GUIUtil::getOpenFileName(this, tr("Select payment request file to open"), "", "", nullptr);
     if(filename.isEmpty())
         return;
     QUrl fileUri = QUrl::fromLocalFile(filename);
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index b80b6541d..53e2e5053 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -17,10 +17,6 @@
 #include "netbase.h"
 #include "txdb.h" // for -dbcache defaults
 
-#ifdef ENABLE_WALLET
-#include "wallet/wallet.h" // for CWallet::GetRequiredFee()
-#endif
-
 #include <QDataWidgetMapper>
 #include <QDir>
 #include <QIntValidator>
@@ -80,6 +76,8 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
     ui->bitcoinAtStartup->setToolTip(ui->bitcoinAtStartup->toolTip().arg(tr(PACKAGE_NAME)));
     ui->bitcoinAtStartup->setText(ui->bitcoinAtStartup->text().arg(tr(PACKAGE_NAME)));
 
+    ui->openBitcoinConfButton->setToolTip(ui->openBitcoinConfButton->toolTip().arg(tr(PACKAGE_NAME)));
+
     ui->lang->setToolTip(ui->lang->toolTip().arg(tr(PACKAGE_NAME)));
     ui->lang->addItem(QString("(") + tr("default") + QString(")"), QVariant(""));
     for (const QString &langStr : translations.entryList())
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index d6e740ee9..fb8c60d10 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -36,7 +36,7 @@ OptionsModel::OptionsModel(QObject *parent, bool resetSettings) :
 
 void OptionsModel::addOverriddenOption(const std::string &option)
 {
-    strOverriddenByCommandLine += QString::fromStdString(option) + "=" + QString::fromStdString(GetArg(option, "")) + " ";
+    strOverriddenByCommandLine += QString::fromStdString(option) + "=" + QString::fromStdString(gArgs.GetArg(option, "")) + " ";
 }
 
 // Writes all missing QSettings with their default values
@@ -86,18 +86,18 @@ void OptionsModel::Init(bool resetSettings)
     //
     // If setting doesn't exist create it with defaults.
     //
-    // If SoftSetArg() or SoftSetBoolArg() return false we were overridden
+    // If gArgs.SoftSetArg() or gArgs.SoftSetBoolArg() return false we were overridden
     // by command-line and show this in the UI.
 
     // Main
     if (!settings.contains("nDatabaseCache"))
         settings.setValue("nDatabaseCache", (qint64)nDefaultDbCache);
-    if (!SoftSetArg("-dbcache", settings.value("nDatabaseCache").toString().toStdString()))
+    if (!gArgs.SoftSetArg("-dbcache", settings.value("nDatabaseCache").toString().toStdString()))
         addOverriddenOption("-dbcache");
 
     if (!settings.contains("nThreadsScriptVerif"))
         settings.setValue("nThreadsScriptVerif", DEFAULT_SCRIPTCHECK_THREADS);
-    if (!SoftSetArg("-par", settings.value("nThreadsScriptVerif").toString().toStdString()))
+    if (!gArgs.SoftSetArg("-par", settings.value("nThreadsScriptVerif").toString().toStdString()))
         addOverriddenOption("-par");
 
     if (!settings.contains("strDataDir"))
@@ -107,54 +107,76 @@ void OptionsModel::Init(bool resetSettings)
 #ifdef ENABLE_WALLET
     if (!settings.contains("bSpendZeroConfChange"))
         settings.setValue("bSpendZeroConfChange", true);
-    if (!SoftSetBoolArg("-spendzeroconfchange", settings.value("bSpendZeroConfChange").toBool()))
+    if (!gArgs.SoftSetBoolArg("-spendzeroconfchange", settings.value("bSpendZeroConfChange").toBool()))
         addOverriddenOption("-spendzeroconfchange");
 #endif
 
     // Network
     if (!settings.contains("fUseUPnP"))
         settings.setValue("fUseUPnP", DEFAULT_UPNP);
-    if (!SoftSetBoolArg("-upnp", settings.value("fUseUPnP").toBool()))
+    if (!gArgs.SoftSetBoolArg("-upnp", settings.value("fUseUPnP").toBool()))
         addOverriddenOption("-upnp");
 
     if (!settings.contains("fListen"))
         settings.setValue("fListen", DEFAULT_LISTEN);
-    if (!SoftSetBoolArg("-listen", settings.value("fListen").toBool()))
+    if (!gArgs.SoftSetBoolArg("-listen", settings.value("fListen").toBool()))
         addOverriddenOption("-listen");
 
     if (!settings.contains("fUseProxy"))
         settings.setValue("fUseProxy", false);
-    if (!settings.contains("addrProxy"))
+    if (!settings.contains("addrProxy") || !settings.value("addrProxy").toString().contains(':'))
         settings.setValue("addrProxy", "127.0.0.1:9050");
     // Only try to set -proxy, if user has enabled fUseProxy
-    if (settings.value("fUseProxy").toBool() && !SoftSetArg("-proxy", settings.value("addrProxy").toString().toStdString()))
+    if (settings.value("fUseProxy").toBool() && !gArgs.SoftSetArg("-proxy", settings.value("addrProxy").toString().toStdString()))
         addOverriddenOption("-proxy");
-    else if(!settings.value("fUseProxy").toBool() && !GetArg("-proxy", "").empty())
+    else if(!settings.value("fUseProxy").toBool() && !gArgs.GetArg("-proxy", "").empty())
         addOverriddenOption("-proxy");
 
     if (!settings.contains("fUseSeparateProxyTor"))
         settings.setValue("fUseSeparateProxyTor", false);
-    if (!settings.contains("addrSeparateProxyTor"))
+    if (!settings.contains("addrSeparateProxyTor") || !settings.value("addrSeparateProxyTor").toString().contains(':'))
         settings.setValue("addrSeparateProxyTor", "127.0.0.1:9050");
     // Only try to set -onion, if user has enabled fUseSeparateProxyTor
-    if (settings.value("fUseSeparateProxyTor").toBool() && !SoftSetArg("-onion", settings.value("addrSeparateProxyTor").toString().toStdString()))
+    if (settings.value("fUseSeparateProxyTor").toBool() && !gArgs.SoftSetArg("-onion", settings.value("addrSeparateProxyTor").toString().toStdString()))
         addOverriddenOption("-onion");
-    else if(!settings.value("fUseSeparateProxyTor").toBool() && !GetArg("-onion", "").empty())
+    else if(!settings.value("fUseSeparateProxyTor").toBool() && !gArgs.GetArg("-onion", "").empty())
         addOverriddenOption("-onion");
 
     // Display
     if (!settings.contains("language"))
         settings.setValue("language", "");
-    if (!SoftSetArg("-lang", settings.value("language").toString().toStdString()))
+    if (!gArgs.SoftSetArg("-lang", settings.value("language").toString().toStdString()))
         addOverriddenOption("-lang");
 
     language = settings.value("language").toString();
 }
 
+/** Helper function to copy contents from one QSettings to another.
+ * By using allKeys this also covers nested settings in a hierarchy.
+ */
+static void CopySettings(QSettings& dst, const QSettings& src)
+{
+    for (const QString& key : src.allKeys()) {
+        dst.setValue(key, src.value(key));
+    }
+}
+
+/** Back up a QSettings to an ini-formatted file. */
+static void BackupSettings(const fs::path& filename, const QSettings& src)
+{
+    qWarning() << "Backing up GUI settings to" << GUIUtil::boostPathToQString(filename);
+    QSettings dst(GUIUtil::boostPathToQString(filename), QSettings::IniFormat);
+    dst.clear();
+    CopySettings(dst, src);
+}
+
 void OptionsModel::Reset()
 {
     QSettings settings;
 
+    // Backup old settings to chain-specific datadir for troubleshooting
+    BackupSettings(GetDataDir(true) / "guisettings.ini.bak", settings);
+
     // Save the strDataDir setting
     QString dataDir = Intro::getDefaultDataDirectory();
     dataDir = settings.value("strDataDir", dataDir).toString();
@@ -441,7 +463,7 @@ void OptionsModel::setRestartRequired(bool fRequired)
     return settings.setValue("fRestartRequired", fRequired);
 }
 
-bool OptionsModel::isRestartRequired()
+bool OptionsModel::isRestartRequired() const
 {
     QSettings settings;
     return settings.value("fRestartRequired", false).toBool();
diff --git a/src/qt/optionsmodel.h b/src/qt/optionsmodel.h
index 78529fbdc..0ac82a414 100644
--- a/src/qt/optionsmodel.h
+++ b/src/qt/optionsmodel.h
@@ -59,18 +59,18 @@ class OptionsModel : public QAbstractListModel
     void setDisplayUnit(const QVariant &value);
 
     /* Explicit getters */
-    bool getHideTrayIcon() { return fHideTrayIcon; }
-    bool getMinimizeToTray() { return fMinimizeToTray; }
-    bool getMinimizeOnClose() { return fMinimizeOnClose; }
-    int getDisplayUnit() { return nDisplayUnit; }
-    QString getThirdPartyTxUrls() { return strThirdPartyTxUrls; }
+    bool getHideTrayIcon() const { return fHideTrayIcon; }
+    bool getMinimizeToTray() const { return fMinimizeToTray; }
+    bool getMinimizeOnClose() const { return fMinimizeOnClose; }
+    int getDisplayUnit() const { return nDisplayUnit; }
+    QString getThirdPartyTxUrls() const { return strThirdPartyTxUrls; }
     bool getProxySettings(QNetworkProxy& proxy) const;
-    bool getCoinControlFeatures() { return fCoinControlFeatures; }
+    bool getCoinControlFeatures() const { return fCoinControlFeatures; }
     const QString& getOverriddenByCommandLine() { return strOverriddenByCommandLine; }
 
     /* Restart flag helper */
     void setRestartRequired(bool fRequired);
-    bool isRestartRequired();
+    bool isRestartRequired() const;
 
 private:
     /* Qt-only settings */
diff --git a/src/qt/overviewpage.cpp b/src/qt/overviewpage.cpp
index ba344f4db..ba1839e7b 100644
--- a/src/qt/overviewpage.cpp
+++ b/src/qt/overviewpage.cpp
@@ -25,7 +25,7 @@ class TxViewDelegate : public QAbstractItemDelegate
 {
     Q_OBJECT
 public:
-    TxViewDelegate(const PlatformStyle *_platformStyle, QObject *parent=nullptr):
+    explicit TxViewDelegate(const PlatformStyle *_platformStyle, QObject *parent=nullptr):
         QAbstractItemDelegate(parent), unit(BitcoinUnits::BTC),
         platformStyle(_platformStyle)
     {
diff --git a/src/qt/paymentrequestplus.cpp b/src/qt/paymentrequestplus.cpp
index 01ec41661..d3799f59a 100644
--- a/src/qt/paymentrequestplus.cpp
+++ b/src/qt/paymentrequestplus.cpp
@@ -22,7 +22,7 @@
 class SSLVerifyError : public std::runtime_error
 {
 public:
-    SSLVerifyError(std::string err) : std::runtime_error(err) { }
+    explicit SSLVerifyError(std::string err) : std::runtime_error(err) { }
 };
 
 bool PaymentRequestPlus::parse(const QByteArray& data)
@@ -66,7 +66,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
 
     // One day we'll support more PKI types, but just
     // x509 for now:
-    const EVP_MD* digestAlgorithm = NULL;
+    const EVP_MD* digestAlgorithm = nullptr;
     if (paymentRequest.pki_type() == "x509+sha256") {
         digestAlgorithm = EVP_sha256();
     }
@@ -104,7 +104,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
         }
 #endif
         const unsigned char *data = (const unsigned char *)certChain.certificate(i).data();
-        X509 *cert = d2i_X509(NULL, &data, certChain.certificate(i).size());
+        X509 *cert = d2i_X509(nullptr, &data, certChain.certificate(i).size());
         if (cert)
             certs.push_back(cert);
     }
@@ -129,7 +129,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
         return false;
     }
 
-    char *website = NULL;
+    char *website = nullptr;
     bool fResult = true;
     try
     {
@@ -145,7 +145,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
             int error = X509_STORE_CTX_get_error(store_ctx);
             // For testing payment requests, we allow self signed root certs!
             // This option is just shown in the UI options, if -help-debug is enabled.
-            if (!(error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT && GetBoolArg("-allowselfsignedrootcertificates", DEFAULT_SELFSIGNED_ROOTCERTS))) {
+            if (!(error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT && gArgs.GetBoolArg("-allowselfsignedrootcertificates", DEFAULT_SELFSIGNED_ROOTCERTS))) {
                 throw SSLVerifyError(X509_verify_cert_error_string(error));
             } else {
                qDebug() << "PaymentRequestPlus::getMerchant: Allowing self signed root certificate, because -allowselfsignedrootcertificates is true.";
@@ -169,7 +169,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
 #endif
         EVP_PKEY *pubkey = X509_get_pubkey(signing_cert);
         EVP_MD_CTX_init(ctx);
-        if (!EVP_VerifyInit_ex(ctx, digestAlgorithm, NULL) ||
+        if (!EVP_VerifyInit_ex(ctx, digestAlgorithm, nullptr) ||
             !EVP_VerifyUpdate(ctx, data_to_verify.data(), data_to_verify.size()) ||
             !EVP_VerifyFinal(ctx, (const unsigned char*)paymentRequest.signature().data(), (unsigned int)paymentRequest.signature().size(), pubkey)) {
             throw SSLVerifyError("Bad signature, invalid payment request.");
@@ -179,7 +179,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
 #endif
 
         // OpenSSL API for getting human printable strings from certs is baroque.
-        int textlen = X509_NAME_get_text_by_NID(certname, NID_commonName, NULL, 0);
+        int textlen = X509_NAME_get_text_by_NID(certname, NID_commonName, nullptr, 0);
         website = new char[textlen + 1];
         if (X509_NAME_get_text_by_NID(certname, NID_commonName, website, textlen + 1) == textlen && textlen > 0) {
             merchant = website;
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index 132ee3274..169684cf6 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -122,7 +122,7 @@ void PaymentServer::LoadRootCAs(X509_STORE* _store)
 
     // Note: use "-system-" default here so that users can pass -rootcertificates=""
     // and get 'I don't like X.509 certificates, don't trust anybody' behavior:
-    QString certFile = QString::fromStdString(GetArg("-rootcertificates", "-system-"));
+    QString certFile = QString::fromStdString(gArgs.GetArg("-rootcertificates", "-system-"));
 
     // Empty store
     if (certFile.isEmpty()) {
@@ -218,17 +218,15 @@ void PaymentServer::ipcParseCommandLine(int argc, char* argv[])
             SendCoinsRecipient r;
             if (GUIUtil::parseBitcoinURI(arg, &r) && !r.address.isEmpty())
             {
-                CBitcoinAddress address(r.address.toStdString());
                 auto tempChainParams = CreateChainParams(CBaseChainParams::MAIN);
 
-                if (address.IsValid(*tempChainParams))
-                {
+                if (IsValidDestinationString(r.address.toStdString(), *tempChainParams)) {
                     SelectParams(CBaseChainParams::MAIN);
-                }
-                else {
+                } else {
                     tempChainParams = CreateChainParams(CBaseChainParams::TESTNET);
-                    if (address.IsValid(*tempChainParams))
+                    if (IsValidDestinationString(r.address.toStdString(), *tempChainParams)) {
                         SelectParams(CBaseChainParams::TESTNET);
+                    }
                 }
             }
         }
@@ -274,7 +272,7 @@ bool PaymentServer::ipcSendCommandLine()
         if (!socket->waitForConnected(BITCOIN_IPC_CONNECT_TIMEOUT))
         {
             delete socket;
-            socket = NULL;
+            socket = nullptr;
             return false;
         }
 
@@ -290,7 +288,7 @@ bool PaymentServer::ipcSendCommandLine()
         socket->disconnectFromServer();
 
         delete socket;
-        socket = NULL;
+        socket = nullptr;
         fResult = true;
     }
 
@@ -364,7 +362,7 @@ void PaymentServer::initNetManager()
 {
     if (!optionsModel)
         return;
-    if (netManager != NULL)
+    if (netManager != nullptr)
         delete netManager;
 
     // netManager is used to fetch paymentrequests given in bitcoin: URIs
@@ -441,8 +439,7 @@ void PaymentServer::handleURIOrFile(const QString& s)
             SendCoinsRecipient recipient;
             if (GUIUtil::parseBitcoinURI(s, &recipient))
             {
-                CBitcoinAddress address(recipient.address.toStdString());
-                if (!address.IsValid()) {
+                if (!IsValidDestinationString(recipient.address.toStdString())) {
                     Q_EMIT message(tr("URI handling"), tr("Invalid payment address %1").arg(recipient.address),
                         CClientUIInterface::MSG_ERROR);
                 }
@@ -560,7 +557,7 @@ bool PaymentServer::processPaymentRequest(const PaymentRequestPlus& request, Sen
         CTxDestination dest;
         if (ExtractDestination(sendingTo.first, dest)) {
             // Append destination address
-            addresses.append(QString::fromStdString(CBitcoinAddress(dest).ToString()));
+            addresses.append(QString::fromStdString(EncodeDestination(dest)));
         }
         else if (!recipient.authenticatedMerchant.isEmpty()) {
             // Unauthenticated payment requests to custom bitcoin addresses are not supported
@@ -620,7 +617,7 @@ void PaymentServer::fetchRequest(const QUrl& url)
     netManager->get(netRequest);
 }
 
-void PaymentServer::fetchPaymentACK(CWallet* wallet, SendCoinsRecipient recipient, QByteArray transaction)
+void PaymentServer::fetchPaymentACK(CWallet* wallet, const SendCoinsRecipient& recipient, QByteArray transaction)
 {
     const payments::PaymentDetails& details = recipient.paymentRequest.getDetails();
     if (!details.has_payment_url())
diff --git a/src/qt/paymentserver.h b/src/qt/paymentserver.h
index 7c6d4507f..98b2364b9 100644
--- a/src/qt/paymentserver.h
+++ b/src/qt/paymentserver.h
@@ -72,15 +72,15 @@ class PaymentServer : public QObject
     static bool ipcSendCommandLine();
 
     // parent should be QApplication object
-    PaymentServer(QObject* parent, bool startLocalServer = true);
+    explicit PaymentServer(QObject* parent, bool startLocalServer = true);
     ~PaymentServer();
 
-    // Load root certificate authorities. Pass NULL (default)
+    // Load root certificate authorities. Pass nullptr (default)
     // to read from the file specified in the -rootcertificates setting,
     // or, if that's not set, to use the system default root certificates.
     // If you pass in a store, you should not X509_STORE_free it: it will be
     // freed either at exit or when another set of CAs are loaded.
-    static void LoadRootCAs(X509_STORE* store = NULL);
+    static void LoadRootCAs(X509_STORE* store = nullptr);
 
     // Return certificate store
     static X509_STORE* getCertStore();
@@ -113,7 +113,7 @@ public Q_SLOTS:
     void uiReady();
 
     // Submit Payment message to a merchant, get back PaymentACK:
-    void fetchPaymentACK(CWallet* wallet, SendCoinsRecipient recipient, QByteArray transaction);
+    void fetchPaymentACK(CWallet* wallet, const SendCoinsRecipient& recipient, QByteArray transaction);
 
     // Handle an incoming URI, URI with local file scheme or file
     void handleURIOrFile(const QString& s);
diff --git a/src/qt/peertablemodel.cpp b/src/qt/peertablemodel.cpp
index 42934f805..8b2a7e704 100644
--- a/src/qt/peertablemodel.cpp
+++ b/src/qt/peertablemodel.cpp
@@ -33,6 +33,10 @@ bool NodeLessThan::operator()(const CNodeCombinedStats &left, const CNodeCombine
         return pLeft->cleanSubVer.compare(pRight->cleanSubVer) < 0;
     case PeerTableModel::Ping:
         return pLeft->dMinPing < pRight->dMinPing;
+    case PeerTableModel::Sent:
+        return pLeft->nSendBytes < pRight->nSendBytes;
+    case PeerTableModel::Received:
+        return pLeft->nRecvBytes < pRight->nRecvBytes;
     }
 
     return false;
@@ -114,7 +118,7 @@ PeerTableModel::PeerTableModel(ClientModel *parent) :
     clientModel(parent),
     timer(0)
 {
-    columns << tr("NodeId") << tr("Node/Service") << tr("User Agent") << tr("Ping");
+    columns << tr("NodeId") << tr("Node/Service") << tr("Ping") << tr("Sent") << tr("Received") << tr("User Agent");
     priv.reset(new PeerTablePriv());
     // default to unsorted
     priv->sortColumn = -1;
@@ -173,10 +177,20 @@ QVariant PeerTableModel::data(const QModelIndex &index, int role) const
             return QString::fromStdString(rec->nodeStats.cleanSubVer);
         case Ping:
             return GUIUtil::formatPingTime(rec->nodeStats.dMinPing);
+        case Sent:
+            return GUIUtil::formatBytes(rec->nodeStats.nSendBytes);
+        case Received:
+            return GUIUtil::formatBytes(rec->nodeStats.nRecvBytes);
         }
     } else if (role == Qt::TextAlignmentRole) {
-        if (index.column() == Ping)
-            return (QVariant)(Qt::AlignRight | Qt::AlignVCenter);
+        switch (index.column()) {
+            case Ping:
+            case Sent:
+            case Received:
+                return QVariant(Qt::AlignRight | Qt::AlignVCenter);
+            default:
+                return QVariant();
+        }
     }
 
     return QVariant();
diff --git a/src/qt/peertablemodel.h b/src/qt/peertablemodel.h
index cc47b67ec..ec91d0712 100644
--- a/src/qt/peertablemodel.h
+++ b/src/qt/peertablemodel.h
@@ -55,8 +55,10 @@ class PeerTableModel : public QAbstractTableModel
     enum ColumnIndex {
         NetNodeId = 0,
         Address = 1,
-        Subversion = 2,
-        Ping = 3
+        Ping = 2,
+        Sent = 3,
+        Received = 4,
+        Subversion = 5
     };
 
     /** @name Methods overridden from QAbstractTableModel
diff --git a/src/qt/receiverequestdialog.cpp b/src/qt/receiverequestdialog.cpp
index 3752fa4b6..4aa6375d8 100644
--- a/src/qt/receiverequestdialog.cpp
+++ b/src/qt/receiverequestdialog.cpp
@@ -68,7 +68,7 @@ void QRImageWidget::saveImage()
 {
     if(!pixmap())
         return;
-    QString fn = GUIUtil::getSaveFileName(this, tr("Save QR Code"), QString(), tr("PNG Image (*.png)"), NULL);
+    QString fn = GUIUtil::getSaveFileName(this, tr("Save QR Code"), QString(), tr("PNG Image (*.png)"), nullptr);
     if (!fn.isEmpty())
     {
         exportImage().save(fn);
diff --git a/src/qt/recentrequeststablemodel.cpp b/src/qt/recentrequeststablemodel.cpp
index 4e88c8802..1c4f7aca8 100644
--- a/src/qt/recentrequeststablemodel.cpp
+++ b/src/qt/recentrequeststablemodel.cpp
@@ -123,7 +123,7 @@ void RecentRequestsTableModel::updateAmountColumnTitle()
 /** Gets title for amount column including current display unit if optionsModel reference available. */
 QString RecentRequestsTableModel::getAmountTitle()
 {
-    return (this->walletModel->getOptionsModel() != NULL) ? tr("Requested") + " ("+BitcoinUnits::name(this->walletModel->getOptionsModel()->getDisplayUnit()) + ")" : "";
+    return (this->walletModel->getOptionsModel() != nullptr) ? tr("Requested") + " ("+BitcoinUnits::name(this->walletModel->getOptionsModel()->getDisplayUnit()) + ")" : "";
 }
 
 QModelIndex RecentRequestsTableModel::index(int row, int column, const QModelIndex &parent) const
diff --git a/src/qt/rpcconsole.cpp b/src/qt/rpcconsole.cpp
index 232068bf4..068c40e1e 100644
--- a/src/qt/rpcconsole.cpp
+++ b/src/qt/rpcconsole.cpp
@@ -28,6 +28,7 @@
 #include <wallet/wallet.h>
 #endif
 
+#include <QDesktopWidget>
 #include <QKeyEvent>
 #include <QMenu>
 #include <QMessageBox>
@@ -60,7 +61,7 @@ const struct {
     {"cmd-reply", ":/icons/tx_output"},
     {"cmd-error", ":/icons/tx_output"},
     {"misc", ":/icons/tx_inout"},
-    {NULL, NULL}
+    {nullptr, nullptr}
 };
 
 namespace {
@@ -428,7 +429,11 @@ RPCConsole::RPCConsole(const PlatformStyle *_platformStyle, QWidget *parent) :
     consoleFontSize(0)
 {
     ui->setupUi(this);
-    GUIUtil::restoreWindowGeometry("nRPCConsoleWindow", this->size(), this);
+    QSettings settings;
+    if (!restoreGeometry(settings.value("RPCConsoleWindowGeometry").toByteArray())) {
+        // Restore failed (perhaps missing setting), center the window
+        move(QApplication::desktop()->availableGeometry().center() - frameGeometry().center());
+    }
 
     ui->openDebugLogfileButton->setToolTip(ui->openDebugLogfileButton->toolTip().arg(tr(PACKAGE_NAME)));
 
@@ -466,14 +471,14 @@ RPCConsole::RPCConsole(const PlatformStyle *_platformStyle, QWidget *parent) :
     ui->detailWidget->hide();
     ui->peerHeading->setText(tr("Select a peer to view detailed information."));
 
-    QSettings settings;
     consoleFontSize = settings.value(fontSizeSettingsKey, QFontInfo(QFont()).pointSize()).toInt();
     clear();
 }
 
 RPCConsole::~RPCConsole()
 {
-    GUIUtil::saveWindowGeometry("nRPCConsoleWindow", this);
+    QSettings settings;
+    settings.setValue("RPCConsoleWindowGeometry", saveGeometry());
     RPCUnsetTimerInterface(rpcTimerInterface);
     delete rpcTimerInterface;
     delete ui;
@@ -532,7 +537,7 @@ void RPCConsole::setClientModel(ClientModel *model)
         setNumConnections(model->getNumConnections());
         connect(model, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
 
-        setNumBlocks(model->getNumBlocks(), model->getLastBlockDate(), model->getVerificationProgress(NULL), false);
+        setNumBlocks(model->getNumBlocks(), model->getLastBlockDate(), model->getVerificationProgress(nullptr), false);
         connect(model, SIGNAL(numBlocksChanged(int,QDateTime,double,bool)), this, SLOT(setNumBlocks(int,QDateTime,double,bool)));
 
         updateNetworkState();
@@ -930,18 +935,6 @@ void RPCConsole::on_sldGraphRange_valueChanged(int value)
     setTrafficGraphRange(mins);
 }
 
-QString RPCConsole::FormatBytes(quint64 bytes)
-{
-    if(bytes < 1024)
-        return QString(tr("%1 B")).arg(bytes);
-    if(bytes < 1024 * 1024)
-        return QString(tr("%1 KB")).arg(bytes / 1024);
-    if(bytes < 1024 * 1024 * 1024)
-        return QString(tr("%1 MB")).arg(bytes / 1024 / 1024);
-
-    return QString(tr("%1 GB")).arg(bytes / 1024 / 1024 / 1024);
-}
-
 void RPCConsole::setTrafficGraphRange(int mins)
 {
     ui->trafficGraph->setGraphRangeMins(mins);
@@ -950,8 +943,8 @@ void RPCConsole::setTrafficGraphRange(int mins)
 
 void RPCConsole::updateTrafficStats(quint64 totalBytesIn, quint64 totalBytesOut)
 {
-    ui->lblBytesIn->setText(FormatBytes(totalBytesIn));
-    ui->lblBytesOut->setText(FormatBytes(totalBytesOut));
+    ui->lblBytesIn->setText(GUIUtil::formatBytes(totalBytesIn));
+    ui->lblBytesOut->setText(GUIUtil::formatBytes(totalBytesOut));
 }
 
 void RPCConsole::peerSelected(const QItemSelection &selected, const QItemSelection &deselected)
@@ -982,7 +975,7 @@ void RPCConsole::peerLayoutChanged()
     if (!clientModel || !clientModel->getPeerTableModel())
         return;
 
-    const CNodeCombinedStats *stats = NULL;
+    const CNodeCombinedStats *stats = nullptr;
     bool fUnselect = false;
     bool fReselect = false;
 
@@ -1045,8 +1038,8 @@ void RPCConsole::updateNodeDetail(const CNodeCombinedStats *stats)
     ui->peerServices->setText(GUIUtil::formatServicesStr(stats->nodeStats.nServices));
     ui->peerLastSend->setText(stats->nodeStats.nLastSend ? GUIUtil::formatDurationStr(GetSystemTimeInSeconds() - stats->nodeStats.nLastSend) : tr("never"));
     ui->peerLastRecv->setText(stats->nodeStats.nLastRecv ? GUIUtil::formatDurationStr(GetSystemTimeInSeconds() - stats->nodeStats.nLastRecv) : tr("never"));
-    ui->peerBytesSent->setText(FormatBytes(stats->nodeStats.nSendBytes));
-    ui->peerBytesRecv->setText(FormatBytes(stats->nodeStats.nRecvBytes));
+    ui->peerBytesSent->setText(GUIUtil::formatBytes(stats->nodeStats.nSendBytes));
+    ui->peerBytesRecv->setText(GUIUtil::formatBytes(stats->nodeStats.nRecvBytes));
     ui->peerConnTime->setText(GUIUtil::formatDurationStr(GetSystemTimeInSeconds() - stats->nodeStats.nTimeConnected));
     ui->peerPingTime->setText(GUIUtil::formatPingTime(stats->nodeStats.dPingTime));
     ui->peerPingWait->setText(GUIUtil::formatPingTime(stats->nodeStats.dPingWait));
diff --git a/src/qt/rpcconsole.h b/src/qt/rpcconsole.h
index ec531c99c..ad6e84a44 100644
--- a/src/qt/rpcconsole.h
+++ b/src/qt/rpcconsole.h
@@ -36,8 +36,8 @@ class RPCConsole: public QWidget
     explicit RPCConsole(const PlatformStyle *platformStyle, QWidget *parent);
     ~RPCConsole();
 
-    static bool RPCParseCommandLine(std::string &strResult, const std::string &strCommand, bool fExecute, std::string * const pstrFilteredOut = NULL);
-    static bool RPCExecuteCommandLine(std::string &strResult, const std::string &strCommand, std::string * const pstrFilteredOut = NULL) {
+    static bool RPCParseCommandLine(std::string &strResult, const std::string &strCommand, bool fExecute, std::string * const pstrFilteredOut = nullptr);
+    static bool RPCExecuteCommandLine(std::string &strResult, const std::string &strCommand, std::string * const pstrFilteredOut = nullptr) {
         return RPCParseCommandLine(strResult, strCommand, true, pstrFilteredOut);
     }
 
@@ -123,7 +123,6 @@ public Q_SLOTS:
     void cmdRequest(const QString &command);
 
 private:
-    static QString FormatBytes(quint64 bytes);
     void startExecutor();
     void setTrafficGraphRange(int mins);
     /** show detailed information on ui about selected node */
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index a01886c3e..6309070fe 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -22,7 +22,7 @@
 #include "ui_interface.h"
 #include "txmempool.h"
 #include "policy/fees.h"
-#include "wallet/wallet.h"
+#include "wallet/fees.h"
 
 #include <QFontMetrics>
 #include <QMessageBox>
@@ -114,10 +114,6 @@ SendCoinsDialog::SendCoinsDialog(const PlatformStyle *_platformStyle, QWidget *p
         settings.setValue("nFeeRadio", 1); // custom
     if (!settings.contains("nFeeRadio"))
         settings.setValue("nFeeRadio", 0); // recommended
-    if (!settings.contains("nCustomFeeRadio") && settings.contains("nTransactionFee") && settings.value("nTransactionFee").toLongLong() > 0) // compatibility
-        settings.setValue("nCustomFeeRadio", 1); // total at least
-    if (!settings.contains("nCustomFeeRadio"))
-        settings.setValue("nCustomFeeRadio", 0); // per kilobyte
     if (!settings.contains("nSmartFeeSliderPosition"))
         settings.setValue("nSmartFeeSliderPosition", 0);
     if (!settings.contains("nTransactionFee"))
@@ -127,8 +123,6 @@ SendCoinsDialog::SendCoinsDialog(const PlatformStyle *_platformStyle, QWidget *p
     ui->groupFee->setId(ui->radioSmartFee, 0);
     ui->groupFee->setId(ui->radioCustomFee, 1);
     ui->groupFee->button((int)std::max(0, std::min(1, settings.value("nFeeRadio").toInt())))->setChecked(true);
-    ui->groupCustomFee->setId(ui->radioCustomPerKilobyte, 0);
-    ui->groupCustomFee->button((int)std::max(0, std::min(1, settings.value("nCustomFeeRadio").toInt())))->setChecked(true);
     ui->customFee->setValue(settings.value("nTransactionFee").toLongLong());
     ui->checkBoxMinimumFee->setChecked(settings.value("fPayOnlyMinFee").toBool());
     minimizeFeeSection(settings.value("fFeeSectionMinimized").toBool());
@@ -178,14 +172,13 @@ void SendCoinsDialog::setModel(WalletModel *_model)
         connect(ui->confTargetSelector, SIGNAL(currentIndexChanged(int)), this, SLOT(coinControlUpdateLabels()));
         connect(ui->groupFee, SIGNAL(buttonClicked(int)), this, SLOT(updateFeeSectionControls()));
         connect(ui->groupFee, SIGNAL(buttonClicked(int)), this, SLOT(coinControlUpdateLabels()));
-        connect(ui->groupCustomFee, SIGNAL(buttonClicked(int)), this, SLOT(coinControlUpdateLabels()));
         connect(ui->customFee, SIGNAL(valueChanged()), this, SLOT(coinControlUpdateLabels()));
         connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this, SLOT(setMinimumFee()));
         connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this, SLOT(updateFeeSectionControls()));
         connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this, SLOT(coinControlUpdateLabels()));
         connect(ui->optInRBF, SIGNAL(stateChanged(int)), this, SLOT(updateSmartFeeLabel()));
         connect(ui->optInRBF, SIGNAL(stateChanged(int)), this, SLOT(coinControlUpdateLabels()));
-        ui->customFee->setSingleStep(CWallet::GetRequiredFee(1000));
+        ui->customFee->setSingleStep(GetRequiredFee(1000));
         updateFeeSectionControls();
         updateMinFeeLabel();
         updateSmartFeeLabel();
@@ -214,7 +207,6 @@ SendCoinsDialog::~SendCoinsDialog()
     QSettings settings;
     settings.setValue("fFeeSectionMinimized", fFeeMinimized);
     settings.setValue("nFeeRadio", ui->groupFee->checkedId());
-    settings.setValue("nCustomFeeRadio", ui->groupCustomFee->checkedId());
     settings.setValue("nConfTarget", getConfTargetForIndex(ui->confTargetSelector->currentIndex()));
     settings.setValue("nTransactionFee", (qint64)ui->customFee->value());
     settings.setValue("fPayOnlyMinFee", ui->checkBoxMinimumFee->isChecked());
@@ -609,8 +601,7 @@ void SendCoinsDialog::on_buttonMinimizeFee_clicked()
 
 void SendCoinsDialog::setMinimumFee()
 {
-    ui->radioCustomPerKilobyte->setChecked(true);
-    ui->customFee->setValue(CWallet::GetRequiredFee(1000));
+    ui->customFee->setValue(GetRequiredFee(1000));
 }
 
 void SendCoinsDialog::updateFeeSectionControls()
@@ -622,7 +613,7 @@ void SendCoinsDialog::updateFeeSectionControls()
     ui->labelFeeEstimation      ->setEnabled(ui->radioSmartFee->isChecked());
     ui->checkBoxMinimumFee      ->setEnabled(ui->radioCustomFee->isChecked());
     ui->labelMinFeeWarning      ->setEnabled(ui->radioCustomFee->isChecked());
-    ui->radioCustomPerKilobyte  ->setEnabled(ui->radioCustomFee->isChecked() && !ui->checkBoxMinimumFee->isChecked());
+    ui->labelCustomPerKilobyte  ->setEnabled(ui->radioCustomFee->isChecked() && !ui->checkBoxMinimumFee->isChecked());
     ui->customFee               ->setEnabled(ui->radioCustomFee->isChecked() && !ui->checkBoxMinimumFee->isChecked());
 }
 
@@ -634,8 +625,7 @@ void SendCoinsDialog::updateFeeMinimizedLabel()
     if (ui->radioSmartFee->isChecked())
         ui->labelFeeMinimized->setText(ui->labelSmartFee->text());
     else {
-        ui->labelFeeMinimized->setText(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), ui->customFee->value()) +
-            ((ui->radioCustomPerKilobyte->isChecked()) ? "/kB" : ""));
+        ui->labelFeeMinimized->setText(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), ui->customFee->value()) + "/kB");
     }
 }
 
@@ -643,7 +633,7 @@ void SendCoinsDialog::updateMinFeeLabel()
 {
     if (model && model->getOptionsModel())
         ui->checkBoxMinimumFee->setText(tr("Pay only the required fee of %1").arg(
-            BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), CWallet::GetRequiredFee(1000)) + "/kB")
+            BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), GetRequiredFee(1000)) + "/kB")
         );
 }
 
@@ -668,7 +658,7 @@ void SendCoinsDialog::updateSmartFeeLabel()
     updateCoinControlState(coin_control);
     coin_control.m_feerate.reset(); // Explicitly use only fee estimation rate for smart fee labels
     FeeCalculation feeCalc;
-    CFeeRate feeRate = CFeeRate(CWallet::GetMinimumFee(1000, coin_control, ::mempool, ::feeEstimator, &feeCalc));
+    CFeeRate feeRate = CFeeRate(GetMinimumFee(1000, coin_control, ::mempool, ::feeEstimator, &feeCalc));
 
     ui->labelSmartFee->setText(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), feeRate.GetFeePerK()) + "/kB");
 
@@ -777,22 +767,19 @@ void SendCoinsDialog::coinControlChangeEdited(const QString& text)
         CoinControlDialog::coinControl->destChange = CNoDestination();
         ui->labelCoinControlChangeLabel->setStyleSheet("QLabel{color:red;}");
 
-        CBitcoinAddress addr = CBitcoinAddress(text.toStdString());
+        const CTxDestination dest = DecodeDestination(text.toStdString());
 
         if (text.isEmpty()) // Nothing entered
         {
             ui->labelCoinControlChangeLabel->setText("");
         }
-        else if (!addr.IsValid()) // Invalid address
+        else if (!IsValidDestination(dest)) // Invalid address
         {
             ui->labelCoinControlChangeLabel->setText(tr("Warning: Invalid Bitcoin address"));
         }
         else // Valid address
         {
-            CKeyID keyid;
-            addr.GetKeyID(keyid);
-            if (!model->havePrivKey(keyid)) // Unknown change address
-            {
+            if (!model->IsSpendable(dest)) {
                 ui->labelCoinControlChangeLabel->setText(tr("Warning: Unknown change address"));
 
                 // confirmation dialog
@@ -800,7 +787,7 @@ void SendCoinsDialog::coinControlChangeEdited(const QString& text)
                     QMessageBox::Yes | QMessageBox::Cancel, QMessageBox::Cancel);
 
                 if(btnRetVal == QMessageBox::Yes)
-                    CoinControlDialog::coinControl->destChange = addr.Get();
+                    CoinControlDialog::coinControl->destChange = dest;
                 else
                 {
                     ui->lineEditCoinControlChange->setText("");
@@ -819,7 +806,7 @@ void SendCoinsDialog::coinControlChangeEdited(const QString& text)
                 else
                     ui->labelCoinControlChangeLabel->setText(tr("(no label)"));
 
-                CoinControlDialog::coinControl->destChange = addr.Get();
+                CoinControlDialog::coinControl->destChange = dest;
             }
         }
     }
diff --git a/src/qt/signverifymessagedialog.cpp b/src/qt/signverifymessagedialog.cpp
index 0950ed023..cba9d4da3 100644
--- a/src/qt/signverifymessagedialog.cpp
+++ b/src/qt/signverifymessagedialog.cpp
@@ -117,16 +117,14 @@ void SignVerifyMessageDialog::on_signMessageButton_SM_clicked()
     /* Clear old signature to ensure users don't get confused on error with an old signature displayed */
     ui->signatureOut_SM->clear();
 
-    CBitcoinAddress addr(ui->addressIn_SM->text().toStdString());
-    if (!addr.IsValid())
-    {
+    CTxDestination destination = DecodeDestination(ui->addressIn_SM->text().toStdString());
+    if (!IsValidDestination(destination)) {
         ui->statusLabel_SM->setStyleSheet("QLabel { color: red; }");
         ui->statusLabel_SM->setText(tr("The entered address is invalid.") + QString(" ") + tr("Please check the address and try again."));
         return;
     }
-    CKeyID keyID;
-    if (!addr.GetKeyID(keyID))
-    {
+    const CKeyID* keyID = boost::get<CKeyID>(&destination);
+    if (!keyID) {
         ui->addressIn_SM->setValid(false);
         ui->statusLabel_SM->setStyleSheet("QLabel { color: red; }");
         ui->statusLabel_SM->setText(tr("The entered address does not refer to a key.") + QString(" ") + tr("Please check the address and try again."));
@@ -142,7 +140,7 @@ void SignVerifyMessageDialog::on_signMessageButton_SM_clicked()
     }
 
     CKey key;
-    if (!model->getPrivKey(keyID, key))
+    if (!model->getPrivKey(*keyID, key))
     {
         ui->statusLabel_SM->setStyleSheet("QLabel { color: red; }");
         ui->statusLabel_SM->setText(tr("Private key for the entered address is not available."));
@@ -164,7 +162,7 @@ void SignVerifyMessageDialog::on_signMessageButton_SM_clicked()
     ui->statusLabel_SM->setStyleSheet("QLabel { color: green; }");
     ui->statusLabel_SM->setText(QString("<nobr>") + tr("Message signed.") + QString("</nobr>"));
 
-    ui->signatureOut_SM->setText(QString::fromStdString(EncodeBase64(&vchSig[0], vchSig.size())));
+    ui->signatureOut_SM->setText(QString::fromStdString(EncodeBase64(vchSig.data(), vchSig.size())));
 }
 
 void SignVerifyMessageDialog::on_copySignatureButton_SM_clicked()
@@ -197,16 +195,13 @@ void SignVerifyMessageDialog::on_addressBookButton_VM_clicked()
 
 void SignVerifyMessageDialog::on_verifyMessageButton_VM_clicked()
 {
-    CBitcoinAddress addr(ui->addressIn_VM->text().toStdString());
-    if (!addr.IsValid())
-    {
+    CTxDestination destination = DecodeDestination(ui->addressIn_VM->text().toStdString());
+    if (!IsValidDestination(destination)) {
         ui->statusLabel_VM->setStyleSheet("QLabel { color: red; }");
         ui->statusLabel_VM->setText(tr("The entered address is invalid.") + QString(" ") + tr("Please check the address and try again."));
         return;
     }
-    CKeyID keyID;
-    if (!addr.GetKeyID(keyID))
-    {
+    if (!boost::get<CKeyID>(&destination)) {
         ui->addressIn_VM->setValid(false);
         ui->statusLabel_VM->setStyleSheet("QLabel { color: red; }");
         ui->statusLabel_VM->setText(tr("The entered address does not refer to a key.") + QString(" ") + tr("Please check the address and try again."));
@@ -237,8 +232,7 @@ void SignVerifyMessageDialog::on_verifyMessageButton_VM_clicked()
         return;
     }
 
-    if (!(CBitcoinAddress(pubkey.GetID()) == addr))
-    {
+    if (!(CTxDestination(pubkey.GetID()) == destination)) {
         ui->statusLabel_VM->setStyleSheet("QLabel { color: red; }");
         ui->statusLabel_VM->setText(QString("<nobr>") + tr("Message verification failed.") + QString("</nobr>"));
         return;
diff --git a/src/qt/splashscreen.cpp b/src/qt/splashscreen.cpp
index 1b7cc6923..a1fbba963 100644
--- a/src/qt/splashscreen.cpp
+++ b/src/qt/splashscreen.cpp
@@ -142,8 +142,8 @@ SplashScreen::~SplashScreen()
 bool SplashScreen::eventFilter(QObject * obj, QEvent * ev) {
     if (ev->type() == QEvent::KeyPress) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(ev);
-        if(keyEvent->text()[0] == 'q' && breakAction != nullptr) {
-            breakAction();
+        if(keyEvent->text()[0] == 'q') {
+            StartShutdown();
         }
     }
     return QObject::eventFilter(obj, ev);
@@ -170,27 +170,18 @@ static void InitMessage(SplashScreen *splash, const std::string &message)
         Q_ARG(QColor, QColor(55,55,55)));
 }
 
-static void ShowProgress(SplashScreen *splash, const std::string &title, int nProgress)
+static void ShowProgress(SplashScreen *splash, const std::string &title, int nProgress, bool resume_possible)
 {
-    InitMessage(splash, title + strprintf("%d", nProgress) + "%");
-}
-
-void SplashScreen::setBreakAction(const std::function<void(void)> &action)
-{
-    breakAction = action;
-}
-
-static void SetProgressBreakAction(SplashScreen *splash, const std::function<void(void)> &action)
-{
-    QMetaObject::invokeMethod(splash, "setBreakAction",
-        Qt::QueuedConnection,
-        Q_ARG(std::function<void(void)>, action));
+    InitMessage(splash, title + std::string("\n") +
+            (resume_possible ? _("(press q to shutdown and continue later)")
+                                : _("press q to shutdown")) +
+            strprintf("\n%d", nProgress) + "%");
 }
 
 #ifdef ENABLE_WALLET
 void SplashScreen::ConnectWallet(CWallet* wallet)
 {
-    wallet->ShowProgress.connect(boost::bind(ShowProgress, this, _1, _2));
+    wallet->ShowProgress.connect(boost::bind(ShowProgress, this, _1, _2, false));
     connectedWallets.push_back(wallet);
 }
 #endif
@@ -199,8 +190,7 @@ void SplashScreen::subscribeToCoreSignals()
 {
     // Connect signals to client
     uiInterface.InitMessage.connect(boost::bind(InitMessage, this, _1));
-    uiInterface.ShowProgress.connect(boost::bind(ShowProgress, this, _1, _2));
-    uiInterface.SetProgressBreakAction.connect(boost::bind(SetProgressBreakAction, this, _1));
+    uiInterface.ShowProgress.connect(boost::bind(ShowProgress, this, _1, _2, _3));
 #ifdef ENABLE_WALLET
     uiInterface.LoadWallet.connect(boost::bind(&SplashScreen::ConnectWallet, this, _1));
 #endif
@@ -210,10 +200,10 @@ void SplashScreen::unsubscribeFromCoreSignals()
 {
     // Disconnect signals from client
     uiInterface.InitMessage.disconnect(boost::bind(InitMessage, this, _1));
-    uiInterface.ShowProgress.disconnect(boost::bind(ShowProgress, this, _1, _2));
+    uiInterface.ShowProgress.disconnect(boost::bind(ShowProgress, this, _1, _2, _3));
 #ifdef ENABLE_WALLET
     for (CWallet* const & pwallet : connectedWallets) {
-        pwallet->ShowProgress.disconnect(boost::bind(ShowProgress, this, _1, _2));
+        pwallet->ShowProgress.disconnect(boost::bind(ShowProgress, this, _1, _2, false));
     }
 #endif
 }
diff --git a/src/qt/splashscreen.h b/src/qt/splashscreen.h
index a88ebb98a..c6cfd503f 100644
--- a/src/qt/splashscreen.h
+++ b/src/qt/splashscreen.h
@@ -36,8 +36,6 @@ public Q_SLOTS:
     /** Show message and progress */
     void showMessage(const QString &message, int alignment, const QColor &color);
 
-    /** Sets the break action */
-    void setBreakAction(const std::function<void(void)> &action);
 protected:
     bool eventFilter(QObject * obj, QEvent * ev);
 
@@ -55,8 +53,6 @@ public Q_SLOTS:
     int curAlignment;
 
     QList<CWallet*> connectedWallets;
-
-    std::function<void(void)> breakAction;
 };
 
 #endif // BITCOIN_QT_SPLASHSCREEN_H
diff --git a/src/qt/test/paymentservertests.cpp b/src/qt/test/paymentservertests.cpp
index b9a8ad6e2..273bd1048 100644
--- a/src/qt/test/paymentservertests.cpp
+++ b/src/qt/test/paymentservertests.cpp
@@ -24,8 +24,8 @@ X509 *parse_b64der_cert(const char* cert_data)
 {
     std::vector<unsigned char> data = DecodeBase64(cert_data);
     assert(data.size() > 0);
-    const unsigned char* dptr = &data[0];
-    X509 *cert = d2i_X509(NULL, &dptr, data.size());
+    const unsigned char* dptr = data.data();
+    X509 *cert = d2i_X509(nullptr, &dptr, data.size());
     assert(cert);
     return cert;
 }
@@ -43,7 +43,7 @@ static SendCoinsRecipient handleRequest(PaymentServer* server, std::vector<unsig
     // Write data to a temp file:
     QTemporaryFile f;
     f.open();
-    f.write((const char*)&data[0], data.size());
+    f.write((const char*)data.data(), data.size());
     f.close();
 
     // Create a QObject, install event filter from PaymentServer
@@ -66,7 +66,7 @@ void PaymentServerTests::paymentServerTests()
 {
     SelectParams(CBaseChainParams::MAIN);
     OptionsModel optionsModel;
-    PaymentServer* server = new PaymentServer(NULL, false);
+    PaymentServer* server = new PaymentServer(nullptr, false);
     X509_STORE* caStore = X509_STORE_new();
     X509_STORE_add_cert(caStore, parse_b64der_cert(caCert1_BASE64));
     PaymentServer::LoadRootCAs(caStore);
@@ -139,7 +139,7 @@ void PaymentServerTests::paymentServerTests()
 
     // Contains a testnet paytoaddress, so payment request network doesn't match client network:
     data = DecodeBase64(paymentrequest1_cert2_BASE64);
-    byteArray = QByteArray((const char*)&data[0], data.size());
+    byteArray = QByteArray((const char*)data.data(), data.size());
     r.paymentRequest.parse(byteArray);
     // Ensure the request is initialized, because network "main" is default, even for
     // uninitialized payment requests and that will fail our test here.
@@ -148,7 +148,7 @@ void PaymentServerTests::paymentServerTests()
 
     // Expired payment request (expires is set to 1 = 1970-01-01 00:00:01):
     data = DecodeBase64(paymentrequest2_cert2_BASE64);
-    byteArray = QByteArray((const char*)&data[0], data.size());
+    byteArray = QByteArray((const char*)data.data(), data.size());
     r.paymentRequest.parse(byteArray);
     // Ensure the request is initialized
     QVERIFY(r.paymentRequest.IsInitialized());
@@ -159,7 +159,7 @@ void PaymentServerTests::paymentServerTests()
     // 9223372036854775807 (uint64), 9223372036854775807 (int64_t) and -1 (int32_t)
     // -1 is 1969-12-31 23:59:59 (for a 32 bit time values)
     data = DecodeBase64(paymentrequest3_cert2_BASE64);
-    byteArray = QByteArray((const char*)&data[0], data.size());
+    byteArray = QByteArray((const char*)data.data(), data.size());
     r.paymentRequest.parse(byteArray);
     // Ensure the request is initialized
     QVERIFY(r.paymentRequest.IsInitialized());
@@ -170,7 +170,7 @@ void PaymentServerTests::paymentServerTests()
     // 9223372036854775808 (uint64), -9223372036854775808 (int64_t) and 0 (int32_t)
     // 0 is 1970-01-01 00:00:00 (for a 32 bit time values)
     data = DecodeBase64(paymentrequest4_cert2_BASE64);
-    byteArray = QByteArray((const char*)&data[0], data.size());
+    byteArray = QByteArray((const char*)data.data(), data.size());
     r.paymentRequest.parse(byteArray);
     // Ensure the request is initialized
     QVERIFY(r.paymentRequest.IsInitialized());
@@ -190,7 +190,7 @@ void PaymentServerTests::paymentServerTests()
 
     // Payment request with amount overflow (amount is set to 21000001 BTC):
     data = DecodeBase64(paymentrequest5_cert2_BASE64);
-    byteArray = QByteArray((const char*)&data[0], data.size());
+    byteArray = QByteArray((const char*)data.data(), data.size());
     r.paymentRequest.parse(byteArray);
     // Ensure the request is initialized
     QVERIFY(r.paymentRequest.IsInitialized());
@@ -205,7 +205,7 @@ void PaymentServerTests::paymentServerTests()
     delete server;
 }
 
-void RecipientCatcher::getRecipient(SendCoinsRecipient r)
+void RecipientCatcher::getRecipient(const SendCoinsRecipient& r)
 {
     recipient = r;
 }
diff --git a/src/qt/test/paymentservertests.h b/src/qt/test/paymentservertests.h
index 9ffcbb02a..faf167f2c 100644
--- a/src/qt/test/paymentservertests.h
+++ b/src/qt/test/paymentservertests.h
@@ -26,7 +26,7 @@ class RecipientCatcher : public QObject
     Q_OBJECT
 
 public Q_SLOTS:
-    void getRecipient(SendCoinsRecipient r);
+    void getRecipient(const SendCoinsRecipient& r);
 
 public:
     SendCoinsRecipient recipient;
diff --git a/src/qt/test/rpcnestedtests.cpp b/src/qt/test/rpcnestedtests.cpp
index fbad9e544..70fdd4bf5 100644
--- a/src/qt/test/rpcnestedtests.cpp
+++ b/src/qt/test/rpcnestedtests.cpp
@@ -11,7 +11,6 @@
 #include "rpc/register.h"
 #include "rpc/server.h"
 #include "rpcconsole.h"
-#include "test/testutil.h"
 #include "test/test_bitcoin.h"
 #include "univalue.h"
 #include "util.h"
@@ -29,7 +28,7 @@ static UniValue rpcNestedTest_rpc(const JSONRPCRequest& request)
 
 static const CRPCCommand vRPCCommands[] =
 {
-    { "test", "rpcNestedTest", &rpcNestedTest_rpc, true, {} },
+    { "test", "rpcNestedTest", &rpcNestedTest_rpc, {} },
 };
 
 void RPCNestedTests::rpcNestedTests()
@@ -37,11 +36,6 @@ void RPCNestedTests::rpcNestedTests()
     // do some test setup
     // could be moved to a more generic place when we add more tests on QT level
     tableRPC.appendCommand("rpcNestedTest", &vRPCCommands[0]);
-    ClearDatadirCache();
-    std::string path = QDir::tempPath().toStdString() + "/" + strprintf("test_bitcoin_qt_%lu_%i", (unsigned long)GetTime(), (int)(GetRand(100000)));
-    QDir dir(QString::fromStdString(path));
-    dir.mkpath(".");
-    ForceSetArg("-datadir", path);
     //mempool.setSanityCheck(1.0);
 
     TestingSetup test;
@@ -69,13 +63,13 @@ void RPCNestedTests::rpcNestedTests()
     RPCConsole::RPCExecuteCommandLine(result, "getblockchaininfo "); //whitespace at the end will be tolerated
     QVERIFY(result.substr(0,1) == "{");
 
-    (RPCConsole::RPCExecuteCommandLine(result, "getblockchaininfo()[\"chain\"]")); //Quote path identifier are allowed, but look after a child contaning the quotes in the key
+    (RPCConsole::RPCExecuteCommandLine(result, "getblockchaininfo()[\"chain\"]")); //Quote path identifier are allowed, but look after a child containing the quotes in the key
     QVERIFY(result == "null");
 
     (RPCConsole::RPCExecuteCommandLine(result, "createrawtransaction [] {} 0")); //parameter not in brackets are allowed
     (RPCConsole::RPCExecuteCommandLine(result2, "createrawtransaction([],{},0)")); //parameter in brackets are allowed
     QVERIFY(result == result2);
-    (RPCConsole::RPCExecuteCommandLine(result2, "createrawtransaction( [],  {} , 0   )")); //whitespace between parametres is allowed
+    (RPCConsole::RPCExecuteCommandLine(result2, "createrawtransaction( [],  {} , 0   )")); //whitespace between parameters is allowed
     QVERIFY(result == result2);
 
     RPCConsole::RPCExecuteCommandLine(result, "getblock(getbestblockhash())[tx][0]", &filtered);
@@ -136,6 +130,4 @@ void RPCNestedTests::rpcNestedTests()
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(result, "rpcNestedTest(abc,,abc)"), std::runtime_error); //don't tollerate empty arguments when using ,
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(result, "rpcNestedTest(abc,,)"), std::runtime_error); //don't tollerate empty arguments when using ,
 #endif
-
-    fs::remove_all(fs::path(path));
 }
diff --git a/src/qt/test/test_main.cpp b/src/qt/test/test_main.cpp
index 1b28a285f..4c04e67cc 100644
--- a/src/qt/test/test_main.cpp
+++ b/src/qt/test/test_main.cpp
@@ -53,11 +53,15 @@ int main(int argc, char *argv[])
     SetupNetworking();
     SelectParams(CBaseChainParams::MAIN);
     noui_connect();
+    ClearDatadirCache();
+    fs::path pathTemp = fs::temp_directory_path() / strprintf("test_bitcoin-qt_%lu_%i", (unsigned long)GetTime(), (int)GetRand(100000));
+    fs::create_directories(pathTemp);
+    gArgs.ForceSetArg("-datadir", pathTemp.string());
 
     bool fInvalid = false;
 
     // Prefer the "minimal" platform for the test instead of the normal default
-    // platform ("xcb", "windows", or "cocoa") so tests can't unintentially
+    // platform ("xcb", "windows", or "cocoa") so tests can't unintentionally
     // interfere with any background GUIs and don't require extra resources.
     #if defined(WIN32)
         _putenv_s("QT_QPA_PLATFORM", "minimal");
@@ -97,5 +101,7 @@ int main(int argc, char *argv[])
     }
 #endif
 
+    fs::remove_all(pathTemp);
+
     return fInvalid;
 }
diff --git a/src/qt/test/wallettests.cpp b/src/qt/test/wallettests.cpp
index ff1eb59f1..12755d43e 100644
--- a/src/qt/test/wallettests.cpp
+++ b/src/qt/test/wallettests.cpp
@@ -13,6 +13,10 @@
 #include "test/test_bitcoin.h"
 #include "validation.h"
 #include "wallet/wallet.h"
+#include "qt/overviewpage.h"
+#include "qt/receivecoinsdialog.h"
+#include "qt/recentrequeststablemodel.h"
+#include "qt/receiverequestdialog.h"
 
 #include <QAbstractButton>
 #include <QAction>
@@ -21,6 +25,9 @@
 #include <QPushButton>
 #include <QTimer>
 #include <QVBoxLayout>
+#include <QTextEdit>
+#include <QListView>
+#include <QDialogButtonBox>
 
 namespace
 {
@@ -57,11 +64,11 @@ void ConfirmSend(QString* text = nullptr, bool cancel = false)
 }
 
 //! Send coins to address and return txid.
-uint256 SendCoins(CWallet& wallet, SendCoinsDialog& sendCoinsDialog, const CBitcoinAddress& address, CAmount amount, bool rbf)
+uint256 SendCoins(CWallet& wallet, SendCoinsDialog& sendCoinsDialog, const CTxDestination& address, CAmount amount, bool rbf)
 {
     QVBoxLayout* entries = sendCoinsDialog.findChild<QVBoxLayout*>("entries");
     SendCoinsEntry* entry = qobject_cast<SendCoinsEntry*>(entries->itemAt(0)->widget());
-    entry->findChild<QValidatedLineEdit*>("payTo")->setText(QString::fromStdString(address.ToString()));
+    entry->findChild<QValidatedLineEdit*>("payTo")->setText(QString::fromStdString(EncodeDestination(address)));
     entry->findChild<BitcoinAmountField*>("payAmount")->setValue(amount);
     sendCoinsDialog.findChild<QFrame*>("frameFee")
         ->findChild<QFrame*>("frameFeeSelection")
@@ -140,7 +147,7 @@ void BumpFee(TransactionView& view, const uint256& txid, bool expectDisabled, st
 //     src/qt/test/test_bitcoin-qt -platform xcb      # Linux
 //     src/qt/test/test_bitcoin-qt -platform windows  # Windows
 //     src/qt/test/test_bitcoin-qt -platform cocoa    # macOS
-void TestSendCoins()
+void TestGUI()
 {
     // Set up wallet and chain with 105 blocks (5 mature blocks for spending).
     TestChain100Setup test;
@@ -157,7 +164,7 @@ void TestSendCoins()
         wallet.SetAddressBook(test.coinbaseKey.GetPubKey().GetID(), "", "receive");
         wallet.AddKeyPubKey(test.coinbaseKey, test.coinbaseKey.GetPubKey());
     }
-    wallet.ScanForWalletTransactions(chainActive.Genesis(), true);
+    wallet.ScanForWalletTransactions(chainActive.Genesis(), nullptr, true);
     wallet.SetBroadcastTransactions(true);
 
     // Create widgets for sending coins and listing transactions.
@@ -172,8 +179,8 @@ void TestSendCoins()
     // Send two transactions, and verify they are added to transaction list.
     TransactionTableModel* transactionTableModel = walletModel.getTransactionTableModel();
     QCOMPARE(transactionTableModel->rowCount({}), 105);
-    uint256 txid1 = SendCoins(wallet, sendCoinsDialog, CBitcoinAddress(CKeyID()), 5 * COIN, false /* rbf */);
-    uint256 txid2 = SendCoins(wallet, sendCoinsDialog, CBitcoinAddress(CKeyID()), 10 * COIN, true /* rbf */);
+    uint256 txid1 = SendCoins(wallet, sendCoinsDialog, CKeyID(), 5 * COIN, false /* rbf */);
+    uint256 txid2 = SendCoins(wallet, sendCoinsDialog, CKeyID(), 10 * COIN, true /* rbf */);
     QCOMPARE(transactionTableModel->rowCount({}), 107);
     QVERIFY(FindTx(*transactionTableModel, txid1).isValid());
     QVERIFY(FindTx(*transactionTableModel, txid2).isValid());
@@ -184,6 +191,68 @@ void TestSendCoins()
     BumpFee(transactionView, txid2, false /* expect disabled */, {} /* expected error */, false /* cancel */);
     BumpFee(transactionView, txid2, true /* expect disabled */, "already bumped" /* expected error */, false /* cancel */);
 
+    // Check current balance on OverviewPage
+    OverviewPage overviewPage(platformStyle.get());
+    overviewPage.setWalletModel(&walletModel);
+    QLabel* balanceLabel = overviewPage.findChild<QLabel*>("labelBalance");
+    QString balanceText = balanceLabel->text();
+    int unit = walletModel.getOptionsModel()->getDisplayUnit();
+    CAmount balance = walletModel.getBalance();
+    QString balanceComparison = BitcoinUnits::formatWithUnit(unit, balance, false, BitcoinUnits::separatorAlways);
+    QCOMPARE(balanceText, balanceComparison);
+
+    // Check Request Payment button
+    ReceiveCoinsDialog receiveCoinsDialog(platformStyle.get());
+    receiveCoinsDialog.setModel(&walletModel);
+    RecentRequestsTableModel* requestTableModel = walletModel.getRecentRequestsTableModel();
+
+    // Label input
+    QLineEdit* labelInput = receiveCoinsDialog.findChild<QLineEdit*>("reqLabel");
+    labelInput->setText("TEST_LABEL_1");
+
+    // Amount input
+    BitcoinAmountField* amountInput = receiveCoinsDialog.findChild<BitcoinAmountField*>("reqAmount");
+    amountInput->setValue(1);
+
+    // Message input
+    QLineEdit* messageInput = receiveCoinsDialog.findChild<QLineEdit*>("reqMessage");
+    messageInput->setText("TEST_MESSAGE_1");
+    int initialRowCount = requestTableModel->rowCount({});
+    QPushButton* requestPaymentButton = receiveCoinsDialog.findChild<QPushButton*>("receiveButton");
+    requestPaymentButton->click();
+    for (QWidget* widget : QApplication::topLevelWidgets()) {
+        if (widget->inherits("ReceiveRequestDialog")) {
+            ReceiveRequestDialog* receiveRequestDialog = qobject_cast<ReceiveRequestDialog*>(widget);
+            QTextEdit* rlist = receiveRequestDialog->QObject::findChild<QTextEdit*>("outUri");
+            QString paymentText = rlist->toPlainText();
+            QStringList paymentTextList = paymentText.split('\n');
+            QCOMPARE(paymentTextList.at(0), QString("Payment information"));
+            QVERIFY(paymentTextList.at(1).indexOf(QString("URI: bitcoin:")) != -1);
+            QVERIFY(paymentTextList.at(2).indexOf(QString("Address:")) != -1);
+            QCOMPARE(paymentTextList.at(3), QString("Amount: 0.00000001 ") + QString::fromStdString(CURRENCY_UNIT));
+            QCOMPARE(paymentTextList.at(4), QString("Label: TEST_LABEL_1"));
+            QCOMPARE(paymentTextList.at(5), QString("Message: TEST_MESSAGE_1"));
+        }
+    }
+
+    // Clear button
+    QPushButton* clearButton = receiveCoinsDialog.findChild<QPushButton*>("clearButton");
+    clearButton->click();
+    QCOMPARE(labelInput->text(), QString(""));
+    QCOMPARE(amountInput->value(), CAmount(0));
+    QCOMPARE(messageInput->text(), QString(""));
+
+    // Check addition to history
+    int currentRowCount = requestTableModel->rowCount({});
+    QCOMPARE(currentRowCount, initialRowCount+1);
+
+    // Check Remove button
+    QTableView* table = receiveCoinsDialog.findChild<QTableView*>("recentRequestsView");
+    table->selectRow(currentRowCount-1);
+    QPushButton* removeRequestButton = receiveCoinsDialog.findChild<QPushButton*>("removeRequestButton");
+    removeRequestButton->click();
+    QCOMPARE(requestTableModel->rowCount({}), currentRowCount-1);
+
     bitdb.Flush(true);
     bitdb.Reset();
 }
@@ -192,5 +261,5 @@ void TestSendCoins()
 
 void WalletTests::walletTests()
 {
-    TestSendCoins();
+    TestGUI();
 }
diff --git a/src/qt/transactiondesc.cpp b/src/qt/transactiondesc.cpp
index bcacc47ef..74f5c774a 100644
--- a/src/qt/transactiondesc.cpp
+++ b/src/qt/transactiondesc.cpp
@@ -91,9 +91,8 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx, TransactionReco
         if (nNet > 0)
         {
             // Credit
-            if (CBitcoinAddress(rec->address).IsValid())
-            {
-                CTxDestination address = CBitcoinAddress(rec->address).Get();
+            CTxDestination address = DecodeDestination(rec->address);
+            if (IsValidDestination(address)) {
                 if (wallet->mapAddressBook.count(address))
                 {
                     strHTML += "<b>" + tr("From") + ":</b> " + tr("unknown") + "<br>";
@@ -118,7 +117,7 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx, TransactionReco
         // Online transaction
         std::string strAddress = wtx.mapValue["to"];
         strHTML += "<b>" + tr("To") + ":</b> ";
-        CTxDestination dest = CBitcoinAddress(strAddress).Get();
+        CTxDestination dest = DecodeDestination(strAddress);
         if (wallet->mapAddressBook.count(dest) && !wallet->mapAddressBook[dest].name.empty())
             strHTML += GUIUtil::HtmlEscape(wallet->mapAddressBook[dest].name) + " ";
         strHTML += GUIUtil::HtmlEscape(strAddress) + "<br>";
@@ -189,7 +188,7 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx, TransactionReco
                         strHTML += "<b>" + tr("To") + ":</b> ";
                         if (wallet->mapAddressBook.count(address) && !wallet->mapAddressBook[address].name.empty())
                             strHTML += GUIUtil::HtmlEscape(wallet->mapAddressBook[address].name) + " ";
-                        strHTML += GUIUtil::HtmlEscape(CBitcoinAddress(address).ToString());
+                        strHTML += GUIUtil::HtmlEscape(EncodeDestination(address));
                         if(toSelf == ISMINE_SPENDABLE)
                             strHTML += " (own address)";
                         else if(toSelf & ISMINE_WATCH_ONLY)
@@ -304,7 +303,7 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx, TransactionReco
                     {
                         if (wallet->mapAddressBook.count(address) && !wallet->mapAddressBook[address].name.empty())
                             strHTML += GUIUtil::HtmlEscape(wallet->mapAddressBook[address].name) + " ";
-                        strHTML += QString::fromStdString(CBitcoinAddress(address).ToString());
+                        strHTML += QString::fromStdString(EncodeDestination(address));
                     }
                     strHTML = strHTML + " " + tr("Amount") + "=" + BitcoinUnits::formatHtmlWithUnit(unit, vout.nValue);
                     strHTML = strHTML + " IsMine=" + (wallet->IsMine(vout) & ISMINE_SPENDABLE ? tr("true") : tr("false")) + "</li>";
diff --git a/src/qt/transactionrecord.cpp b/src/qt/transactionrecord.cpp
index 03fd734e9..d40ffd22c 100644
--- a/src/qt/transactionrecord.cpp
+++ b/src/qt/transactionrecord.cpp
@@ -55,7 +55,7 @@ QList<TransactionRecord> TransactionRecord::decomposeTransaction(const CWallet *
                 {
                     // Received by Bitcoin Address
                     sub.type = TransactionRecord::RecvWithAddress;
-                    sub.address = CBitcoinAddress(address).ToString();
+                    sub.address = EncodeDestination(address);
                 }
                 else
                 {
@@ -127,7 +127,7 @@ QList<TransactionRecord> TransactionRecord::decomposeTransaction(const CWallet *
                 {
                     // Sent to Bitcoin Address
                     sub.type = TransactionRecord::SendToAddress;
-                    sub.address = CBitcoinAddress(address).ToString();
+                    sub.address = EncodeDestination(address);
                 }
                 else
                 {
@@ -167,7 +167,7 @@ void TransactionRecord::updateStatus(const CWalletTx &wtx)
     // Determine transaction status
 
     // Find the block the tx is in
-    CBlockIndex* pindex = NULL;
+    CBlockIndex* pindex = nullptr;
     BlockMap::iterator mi = mapBlockIndex.find(wtx.hashBlock);
     if (mi != mapBlockIndex.end())
         pindex = (*mi).second;
@@ -248,7 +248,7 @@ void TransactionRecord::updateStatus(const CWalletTx &wtx)
     status.needsUpdate = false;
 }
 
-bool TransactionRecord::statusUpdateNeeded()
+bool TransactionRecord::statusUpdateNeeded() const
 {
     AssertLockHeld(cs_main);
     return status.cur_num_blocks != chainActive.Height() || status.needsUpdate;
diff --git a/src/qt/transactionrecord.h b/src/qt/transactionrecord.h
index 59f681224..a26e67614 100644
--- a/src/qt/transactionrecord.h
+++ b/src/qt/transactionrecord.h
@@ -140,7 +140,7 @@ class TransactionRecord
 
     /** Return whether a status update is needed.
      */
-    bool statusUpdateNeeded();
+    bool statusUpdateNeeded() const;
 };
 
 #endif // BITCOIN_QT_TRANSACTIONRECORD_H
diff --git a/src/qt/transactiontablemodel.h b/src/qt/transactiontablemodel.h
index 80aeb64c4..b1f81498b 100644
--- a/src/qt/transactiontablemodel.h
+++ b/src/qt/transactiontablemodel.h
@@ -79,7 +79,7 @@ class TransactionTableModel : public QAbstractTableModel
     QVariant data(const QModelIndex &index, int role) const;
     QVariant headerData(int section, Qt::Orientation orientation, int role) const;
     QModelIndex index(int row, int column, const QModelIndex & parent = QModelIndex()) const;
-    bool processingQueuedTransactions() { return fProcessingQueuedTransactions; }
+    bool processingQueuedTransactions() const { return fProcessingQueuedTransactions; }
 
 private:
     CWallet* wallet;
diff --git a/src/qt/transactionview.cpp b/src/qt/transactionview.cpp
index 43d6e8826..39dfdb587 100644
--- a/src/qt/transactionview.cpp
+++ b/src/qt/transactionview.cpp
@@ -33,6 +33,7 @@
 #include <QScrollBar>
 #include <QSignalMapper>
 #include <QTableView>
+#include <QTimer>
 #include <QUrl>
 #include <QVBoxLayout>
 
@@ -112,6 +113,17 @@ TransactionView::TransactionView(const PlatformStyle *platformStyle, QWidget *pa
     amountWidget->setValidator(new QDoubleValidator(0, 1e20, 8, this));
     hlayout->addWidget(amountWidget);
 
+    // Delay before filtering transactions in ms
+    static const int input_filter_delay = 200;
+
+    QTimer* amount_typing_delay = new QTimer(this);
+    amount_typing_delay->setSingleShot(true);
+    amount_typing_delay->setInterval(input_filter_delay);
+
+    QTimer* prefix_typing_delay = new QTimer(this);
+    prefix_typing_delay->setSingleShot(true);
+    prefix_typing_delay->setInterval(input_filter_delay);
+
     QVBoxLayout *vlayout = new QVBoxLayout(this);
     vlayout->setContentsMargins(0,0,0,0);
     vlayout->setSpacing(0);
@@ -173,8 +185,10 @@ TransactionView::TransactionView(const PlatformStyle *platformStyle, QWidget *pa
     connect(dateWidget, SIGNAL(activated(int)), this, SLOT(chooseDate(int)));
     connect(typeWidget, SIGNAL(activated(int)), this, SLOT(chooseType(int)));
     connect(watchOnlyWidget, SIGNAL(activated(int)), this, SLOT(chooseWatchonly(int)));
-    connect(addressWidget, SIGNAL(textChanged(QString)), this, SLOT(changedPrefix(QString)));
-    connect(amountWidget, SIGNAL(textChanged(QString)), this, SLOT(changedAmount(QString)));
+    connect(amountWidget, SIGNAL(textChanged(QString)), amount_typing_delay, SLOT(start()));
+    connect(amount_typing_delay, SIGNAL(timeout()), this, SLOT(changedAmount()));
+    connect(addressWidget, SIGNAL(textChanged(QString)), prefix_typing_delay, SLOT(start()));
+    connect(prefix_typing_delay, SIGNAL(timeout()), this, SLOT(changedPrefix()));
 
     connect(view, SIGNAL(doubleClicked(QModelIndex)), this, SIGNAL(doubleClicked(QModelIndex)));
     connect(view, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(contextualMenu(QPoint)));
@@ -312,20 +326,19 @@ void TransactionView::chooseWatchonly(int idx)
         (TransactionFilterProxy::WatchOnlyFilter)watchOnlyWidget->itemData(idx).toInt());
 }
 
-void TransactionView::changedPrefix(const QString &prefix)
+void TransactionView::changedPrefix()
 {
     if(!transactionProxyModel)
         return;
-    transactionProxyModel->setAddressPrefix(prefix);
+    transactionProxyModel->setAddressPrefix(addressWidget->text());
 }
 
-void TransactionView::changedAmount(const QString &amount)
+void TransactionView::changedAmount()
 {
     if(!transactionProxyModel)
         return;
     CAmount amount_parsed = 0;
-    if(BitcoinUnits::parse(model->getOptionsModel()->getDisplayUnit(), amount, &amount_parsed))
-    {
+    if (BitcoinUnits::parse(model->getOptionsModel()->getDisplayUnit(), amountWidget->text(), &amount_parsed)) {
         transactionProxyModel->setMinAmount(amount_parsed);
     }
     else
@@ -343,7 +356,7 @@ void TransactionView::exportClicked()
     // CSV is currently the only supported format
     QString filename = GUIUtil::getSaveFileName(this,
         tr("Export Transaction History"), QString(),
-        tr("Comma separated file (*.csv)"), NULL);
+        tr("Comma separated file (*.csv)"), nullptr);
 
     if (filename.isNull())
         return;
diff --git a/src/qt/transactionview.h b/src/qt/transactionview.h
index 52e57cae4..5b4cfd4a8 100644
--- a/src/qt/transactionview.h
+++ b/src/qt/transactionview.h
@@ -112,8 +112,8 @@ public Q_SLOTS:
     void chooseDate(int idx);
     void chooseType(int idx);
     void chooseWatchonly(int idx);
-    void changedPrefix(const QString &prefix);
-    void changedAmount(const QString &amount);
+    void changedAmount();
+    void changedPrefix();
     void exportClicked();
     void focusTransaction(const QModelIndex&);
 
diff --git a/src/qt/utilitydialog.cpp b/src/qt/utilitydialog.cpp
index c9b344fbd..5d8c23d13 100644
--- a/src/qt/utilitydialog.cpp
+++ b/src/qt/utilitydialog.cpp
@@ -78,7 +78,7 @@ HelpMessageDialog::HelpMessageDialog(QWidget *parent, bool about) :
         cursor.insertBlock();
 
         std::string strUsage = HelpMessage(HMM_BITCOIN_QT);
-        const bool showDebug = GetBoolArg("-help-debug", false);
+        const bool showDebug = gArgs.GetBoolArg("-help-debug", false);
         strUsage += HelpMessageGroup(tr("UI Options:").toStdString());
         if (showDebug) {
             strUsage += HelpMessageOpt("-allowselfsignedrootcertificates", strprintf("Allow self signed root certificates (default: %u)", DEFAULT_SELFSIGNED_ROOTCERTS));
diff --git a/src/qt/utilitydialog.h b/src/qt/utilitydialog.h
index acaa86414..738eeed13 100644
--- a/src/qt/utilitydialog.h
+++ b/src/qt/utilitydialog.h
@@ -41,7 +41,7 @@ class ShutdownWindow : public QWidget
     Q_OBJECT
 
 public:
-    ShutdownWindow(QWidget *parent=0, Qt::WindowFlags f=0);
+    explicit ShutdownWindow(QWidget *parent=0, Qt::WindowFlags f=0);
     static QWidget *showShutdownWindow(BitcoinGUI *window);
 
 protected:
diff --git a/src/qt/walletframe.cpp b/src/qt/walletframe.cpp
index f3183320f..714a59431 100644
--- a/src/qt/walletframe.cpp
+++ b/src/qt/walletframe.cpp
@@ -7,6 +7,7 @@
 #include "bitcoingui.h"
 #include "walletview.h"
 
+#include <cassert>
 #include <cstdio>
 
 #include <QHBoxLayout>
@@ -69,6 +70,7 @@ bool WalletFrame::setCurrentWallet(const QString& name)
 
     WalletView *walletView = mapWalletViews.value(name);
     walletStack->setCurrentWidget(walletView);
+    assert(walletView);
     walletView->updateEncryptionStatus();
     return true;
 }
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index ba0e1da0c..53b1c2967 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -188,8 +188,7 @@ void WalletModel::updateWatchOnlyFlag(bool fHaveWatchonly)
 
 bool WalletModel::validateAddress(const QString &address)
 {
-    CBitcoinAddress addressParsed(address.toStdString());
-    return addressParsed.IsValid();
+    return IsValidDestinationString(address.toStdString());
 }
 
 WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransaction &transaction, const CCoinControl& coinControl)
@@ -247,7 +246,7 @@ WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransact
             setAddress.insert(rcp.address);
             ++nAddresses;
 
-            CScript scriptPubKey = GetScriptForDestination(CBitcoinAddress(rcp.address.toStdString()).Get());
+            CScript scriptPubKey = GetScriptForDestination(DecodeDestination(rcp.address.toStdString()));
             CRecipient recipient = {scriptPubKey, rcp.amount, rcp.fSubtractFeeFromAmount};
             vecSend.push_back(recipient);
 
@@ -348,7 +347,7 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(WalletModelTransaction &tran
         if (!rcp.paymentRequest.IsInitialized())
         {
             std::string strAddress = rcp.address.toStdString();
-            CTxDestination dest = CBitcoinAddress(strAddress).Get();
+            CTxDestination dest = DecodeDestination(strAddress);
             std::string strLabel = rcp.label.toStdString();
             {
                 LOCK(wallet->cs_wallet);
@@ -464,7 +463,7 @@ static void NotifyAddressBookChanged(WalletModel *walletmodel, CWallet *wallet,
         const CTxDestination &address, const std::string &label, bool isMine,
         const std::string &purpose, ChangeType status)
 {
-    QString strAddress = QString::fromStdString(CBitcoinAddress(address).ToString());
+    QString strAddress = QString::fromStdString(EncodeDestination(address));
     QString strLabel = QString::fromStdString(label);
     QString strPurpose = QString::fromStdString(purpose);
 
@@ -561,9 +560,9 @@ bool WalletModel::getPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const
     return wallet->GetPubKey(address, vchPubKeyOut);
 }
 
-bool WalletModel::havePrivKey(const CKeyID &address) const
+bool WalletModel::IsSpendable(const CTxDestination& dest) const
 {
-    return wallet->HaveKey(address);
+    return IsMine(*wallet, dest) & ISMINE_SPENDABLE;
 }
 
 bool WalletModel::getPrivKey(const CKeyID &address, CKey& vchPrivKeyOut) const
@@ -577,10 +576,11 @@ void WalletModel::getOutputs(const std::vector<COutPoint>& vOutpoints, std::vect
     LOCK2(cs_main, wallet->cs_wallet);
     for (const COutPoint& outpoint : vOutpoints)
     {
-        if (!wallet->mapWallet.count(outpoint.hash)) continue;
-        int nDepth = wallet->mapWallet[outpoint.hash].GetDepthInMainChain();
+        auto it = wallet->mapWallet.find(outpoint.hash);
+        if (it == wallet->mapWallet.end()) continue;
+        int nDepth = it->second.GetDepthInMainChain();
         if (nDepth < 0) continue;
-        COutput out(&wallet->mapWallet[outpoint.hash], outpoint.n, nDepth, true /* spendable */, true /* solvable */, true /* safe */);
+        COutput out(&it->second, outpoint.n, nDepth, true /* spendable */, true /* solvable */, true /* safe */);
         vOutputs.push_back(out);
     }
 }
@@ -595,7 +595,7 @@ bool WalletModel::isSpent(const COutPoint& outpoint) const
 void WalletModel::listCoins(std::map<QString, std::vector<COutput> >& mapCoins) const
 {
     for (auto& group : wallet->ListCoins()) {
-        auto& resultGroup = mapCoins[QString::fromStdString(CBitcoinAddress(group.first).ToString())];
+        auto& resultGroup = mapCoins[QString::fromStdString(EncodeDestination(group.first))];
         for (auto& coin : group.second) {
             resultGroup.emplace_back(std::move(coin));
         }
@@ -633,7 +633,7 @@ void WalletModel::loadReceiveRequests(std::vector<std::string>& vReceiveRequests
 
 bool WalletModel::saveReceiveRequest(const std::string &sAddress, const int64_t nId, const std::string &sRequest)
 {
-    CTxDestination dest = CBitcoinAddress(sAddress).Get();
+    CTxDestination dest = DecodeDestination(sAddress);
 
     std::stringstream ss;
     ss << nId;
@@ -739,7 +739,7 @@ bool WalletModel::bumpFee(uint256 hash)
 
 bool WalletModel::isWalletEnabled()
 {
-   return !GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET);
+   return !gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET);
 }
 
 bool WalletModel::hdEnabled() const
diff --git a/src/qt/walletmodel.h b/src/qt/walletmodel.h
index 5258dc669..05733f827 100644
--- a/src/qt/walletmodel.h
+++ b/src/qt/walletmodel.h
@@ -129,7 +129,7 @@ class WalletModel : public QObject
     TransactionTableModel *getTransactionTableModel();
     RecentRequestsTableModel *getRecentRequestsTableModel();
 
-    CAmount getBalance(const CCoinControl *coinControl = NULL) const;
+    CAmount getBalance(const CCoinControl *coinControl = nullptr) const;
     CAmount getUnconfirmedBalance() const;
     CAmount getImmatureBalance() const;
     bool haveWatchOnly() const;
@@ -190,7 +190,7 @@ class WalletModel : public QObject
     UnlockContext requestUnlock();
 
     bool getPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const;
-    bool havePrivKey(const CKeyID &address) const;
+    bool IsSpendable(const CTxDestination& dest) const;
     bool getPrivKey(const CKeyID &address, CKey& vchPrivKeyOut) const;
     void getOutputs(const std::vector<COutPoint>& vOutpoints, std::vector<COutput>& vOutputs);
     bool isSpent(const COutPoint& outpoint) const;
diff --git a/src/qt/walletmodeltransaction.cpp b/src/qt/walletmodeltransaction.cpp
index 8bc9ef725..eae2c27f8 100644
--- a/src/qt/walletmodeltransaction.cpp
+++ b/src/qt/walletmodeltransaction.cpp
@@ -22,12 +22,12 @@ WalletModelTransaction::~WalletModelTransaction()
     delete walletTransaction;
 }
 
-QList<SendCoinsRecipient> WalletModelTransaction::getRecipients()
+QList<SendCoinsRecipient> WalletModelTransaction::getRecipients() const
 {
     return recipients;
 }
 
-CWalletTx *WalletModelTransaction::getTransaction()
+CWalletTx *WalletModelTransaction::getTransaction() const
 {
     return walletTransaction;
 }
@@ -37,7 +37,7 @@ unsigned int WalletModelTransaction::getTransactionSize()
     return (!walletTransaction ? 0 : ::GetVirtualTransactionSize(*walletTransaction));
 }
 
-CAmount WalletModelTransaction::getTransactionFee()
+CAmount WalletModelTransaction::getTransactionFee() const
 {
     return fee;
 }
@@ -79,7 +79,7 @@ void WalletModelTransaction::reassignAmounts(int nChangePosRet)
     }
 }
 
-CAmount WalletModelTransaction::getTotalTransactionAmount()
+CAmount WalletModelTransaction::getTotalTransactionAmount() const
 {
     CAmount totalTransactionAmount = 0;
     for (const SendCoinsRecipient &rcp : recipients)
diff --git a/src/qt/walletmodeltransaction.h b/src/qt/walletmodeltransaction.h
index 64922efad..d7ecd7aa8 100644
--- a/src/qt/walletmodeltransaction.h
+++ b/src/qt/walletmodeltransaction.h
@@ -22,15 +22,15 @@ class WalletModelTransaction
     explicit WalletModelTransaction(const QList<SendCoinsRecipient> &recipients);
     ~WalletModelTransaction();
 
-    QList<SendCoinsRecipient> getRecipients();
+    QList<SendCoinsRecipient> getRecipients() const;
 
-    CWalletTx *getTransaction();
+    CWalletTx *getTransaction() const;
     unsigned int getTransactionSize();
 
     void setTransactionFee(const CAmount& newFee);
-    CAmount getTransactionFee();
+    CAmount getTransactionFee() const;
 
-    CAmount getTotalTransactionAmount();
+    CAmount getTotalTransactionAmount() const;
 
     void newPossibleKeyChange(CWallet *wallet);
     CReserveKey *getPossibleKeyChange();
diff --git a/src/qt/walletview.cpp b/src/qt/walletview.cpp
index 4a18c0bd4..a56a40037 100644
--- a/src/qt/walletview.cpp
+++ b/src/qt/walletview.cpp
@@ -122,8 +122,8 @@ void WalletView::setWalletModel(WalletModel *_walletModel)
     overviewPage->setWalletModel(_walletModel);
     receiveCoinsPage->setModel(_walletModel);
     sendCoinsPage->setModel(_walletModel);
-    usedReceivingAddressesPage->setModel(_walletModel->getAddressTableModel());
-    usedSendingAddressesPage->setModel(_walletModel->getAddressTableModel());
+    usedReceivingAddressesPage->setModel(_walletModel ? _walletModel->getAddressTableModel() : nullptr);
+    usedSendingAddressesPage->setModel(_walletModel ? _walletModel->getAddressTableModel() : nullptr);
 
     if (_walletModel)
     {
@@ -246,7 +246,7 @@ void WalletView::backupWallet()
 {
     QString filename = GUIUtil::getSaveFileName(this,
         tr("Backup Wallet"), QString(),
-        tr("Wallet Data (*.dat)"), NULL);
+        tr("Wallet Data (*.dat)"), nullptr);
 
     if (filename.isEmpty())
         return;
diff --git a/src/qt/winshutdownmonitor.cpp b/src/qt/winshutdownmonitor.cpp
index d6f40c38b..d78d9a235 100644
--- a/src/qt/winshutdownmonitor.cpp
+++ b/src/qt/winshutdownmonitor.cpp
@@ -57,7 +57,7 @@ void WinShutdownMonitor::registerShutdownBlockReason(const QString& strReason, c
 {
     typedef BOOL (WINAPI *PSHUTDOWNBRCREATE)(HWND, LPCWSTR);
     PSHUTDOWNBRCREATE shutdownBRCreate = (PSHUTDOWNBRCREATE)GetProcAddress(GetModuleHandleA("User32.dll"), "ShutdownBlockReasonCreate");
-    if (shutdownBRCreate == NULL) {
+    if (shutdownBRCreate == nullptr) {
         qWarning() << "registerShutdownBlockReason: GetProcAddress for ShutdownBlockReasonCreate failed";
         return;
     }
diff --git a/src/random.cpp b/src/random.cpp
index e07ef4447..7e0e94439 100644
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -46,10 +46,10 @@
 #include <openssl/err.h>
 #include <openssl/rand.h>
 
-static void RandFailure()
+[[noreturn]] static void RandFailure()
 {
     LogPrintf("Failed to read randomness, aborting\n");
-    abort();
+    std::abort();
 }
 
 static inline int64_t GetPerformanceCounter()
@@ -155,7 +155,7 @@ static void RandAddSeedPerfmon()
     const size_t nMaxSize = 10000000; // Bail out at more than 10MB of performance data
     while (true) {
         nSize = vData.size();
-        ret = RegQueryValueExA(HKEY_PERFORMANCE_DATA, "Global", NULL, NULL, vData.data(), &nSize);
+        ret = RegQueryValueExA(HKEY_PERFORMANCE_DATA, "Global", nullptr, nullptr, vData.data(), &nSize);
         if (ret != ERROR_MORE_DATA || vData.size() >= nMaxSize)
             break;
         vData.resize(std::max((vData.size() * 3) / 2, nMaxSize)); // Grow size of buffer exponentially
@@ -203,7 +203,7 @@ void GetOSRand(unsigned char *ent32)
 {
 #if defined(WIN32)
     HCRYPTPROV hProvider;
-    int ret = CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
+    int ret = CryptAcquireContextW(&hProvider, nullptr, nullptr, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
     if (!ret) {
         RandFailure();
     }
@@ -242,7 +242,7 @@ void GetOSRand(unsigned char *ent32)
     }
 #elif defined(HAVE_GETENTROPY_RAND) && defined(MAC_OSX)
     // We need a fallback for OSX < 10.12
-    if (&getentropy != NULL) {
+    if (&getentropy != nullptr) {
         if (getentropy(ent32, NUM_OS_RANDOM_BYTES) != 0) {
             RandFailure();
         }
@@ -257,7 +257,7 @@ void GetOSRand(unsigned char *ent32)
     int have = 0;
     do {
         size_t len = NUM_OS_RANDOM_BYTES - have;
-        if (sysctl(name, ARRAYLEN(name), ent32 + have, &len, NULL, 0) != 0) {
+        if (sysctl(name, ARRAYLEN(name), ent32 + have, &len, nullptr, 0) != 0) {
             RandFailure();
         }
         have += len;
diff --git a/src/rest.cpp b/src/rest.cpp
index 33e3fb452..4d2cdfdf0 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -48,7 +48,7 @@ struct CCoin {
     ADD_SERIALIZE_METHODS;
 
     CCoin() : nHeight(0) {}
-    CCoin(Coin&& in) : nHeight(in.nHeight), out(std::move(in.out)) {}
+    explicit CCoin(Coin&& in) : nHeight(in.nHeight), out(std::move(in.out)) {}
 
     template <typename Stream, typename Operation>
     inline void SerializationOp(Stream& s, Operation ser_action)
@@ -134,7 +134,7 @@ static bool rest_headers(HTTPRequest* req,
     if (path.size() != 2)
         return RESTERR(req, HTTP_BAD_REQUEST, "No header count specified. Use /rest/headers/<count>/<hash>.<ext>.");
 
-    long count = strtol(path[0].c_str(), NULL, 10);
+    long count = strtol(path[0].c_str(), nullptr, 10);
     if (count < 1 || count > 2000)
         return RESTERR(req, HTTP_BAD_REQUEST, "Header count out of range: " + path[0]);
 
@@ -148,8 +148,8 @@ static bool rest_headers(HTTPRequest* req,
     {
         LOCK(cs_main);
         BlockMap::const_iterator it = mapBlockIndex.find(hash);
-        const CBlockIndex *pindex = (it != mapBlockIndex.end()) ? it->second : NULL;
-        while (pindex != NULL && chainActive.Contains(pindex)) {
+        const CBlockIndex *pindex = (it != mapBlockIndex.end()) ? it->second : nullptr;
+        while (pindex != nullptr && chainActive.Contains(pindex)) {
             headers.push_back(pindex);
             if (headers.size() == (unsigned long)count)
                 break;
@@ -190,9 +190,6 @@ static bool rest_headers(HTTPRequest* req,
         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: .bin, .hex)");
     }
     }
-
-    // not reached
-    return true; // continue to process further HTTP reqs on this cxn
 }
 
 static bool rest_block(HTTPRequest* req,
@@ -209,7 +206,7 @@ static bool rest_block(HTTPRequest* req,
         return RESTERR(req, HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);
 
     CBlock block;
-    CBlockIndex* pblockindex = NULL;
+    CBlockIndex* pblockindex = nullptr;
     {
         LOCK(cs_main);
         if (mapBlockIndex.count(hash) == 0)
@@ -253,9 +250,6 @@ static bool rest_block(HTTPRequest* req,
         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: " + AvailableDataFormatsString() + ")");
     }
     }
-
-    // not reached
-    return true; // continue to process further HTTP reqs on this cxn
 }
 
 static bool rest_block_extended(HTTPRequest* req, const std::string& strURIPart)
@@ -292,9 +286,6 @@ static bool rest_chaininfo(HTTPRequest* req, const std::string& strURIPart)
         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: json)");
     }
     }
-
-    // not reached
-    return true; // continue to process further HTTP reqs on this cxn
 }
 
 static bool rest_mempool_info(HTTPRequest* req, const std::string& strURIPart)
@@ -317,9 +308,6 @@ static bool rest_mempool_info(HTTPRequest* req, const std::string& strURIPart)
         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: json)");
     }
     }
-
-    // not reached
-    return true; // continue to process further HTTP reqs on this cxn
 }
 
 static bool rest_mempool_contents(HTTPRequest* req, const std::string& strURIPart)
@@ -342,9 +330,6 @@ static bool rest_mempool_contents(HTTPRequest* req, const std::string& strURIPar
         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: json)");
     }
     }
-
-    // not reached
-    return true; // continue to process further HTTP reqs on this cxn
 }
 
 static bool rest_tx(HTTPRequest* req, const std::string& strURIPart)
@@ -394,9 +379,6 @@ static bool rest_tx(HTTPRequest* req, const std::string& strURIPart)
         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: " + AvailableDataFormatsString() + ")");
     }
     }
-
-    // not reached
-    return true; // continue to process further HTTP reqs on this cxn
 }
 
 static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
@@ -427,10 +409,8 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
 
     if (uriParts.size() > 0)
     {
-
         //inputs is sent over URI scheme (/rest/getutxos/checkmempool/txid1-n/txid2-n/...)
-        if (uriParts.size() > 0 && uriParts[0] == "checkmempool")
-            fCheckMemPool = true;
+        if (uriParts[0] == "checkmempool") fCheckMemPool = true;
 
         for (size_t i = (fCheckMemPool) ? 1 : 0; i < uriParts.size(); i++)
         {
@@ -581,9 +561,6 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: " + AvailableDataFormatsString() + ")");
     }
     }
-
-    // not reached
-    return true; // continue to process further HTTP reqs on this cxn
 }
 
 static const struct {
diff --git a/src/reverse_iterator.h b/src/reverse_iterator.h
index 46789e541..ab467f07c 100644
--- a/src/reverse_iterator.h
+++ b/src/reverse_iterator.h
@@ -17,7 +17,7 @@ class reverse_range
     T &m_x;
     
 public:
-    reverse_range(T &x) : m_x(x) {}
+    explicit reverse_range(T &x) : m_x(x) {}
     
     auto begin() const -> decltype(this->m_x.rbegin())
     {
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index d65e107e3..68af376f3 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -24,6 +24,7 @@
 #include "util.h"
 #include "utilstrencodings.h"
 #include "hash.h"
+#include "warnings.h"
 
 #include <stdint.h>
 
@@ -48,9 +49,9 @@ extern void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue&
 
 double GetDifficulty(const CBlockIndex* blockindex)
 {
-    if (blockindex == NULL)
+    if (blockindex == nullptr)
     {
-        if (chainActive.Tip() == NULL)
+        if (chainActive.Tip() == nullptr)
             return 1.0;
         else
             blockindex = chainActive.Tip();
@@ -125,7 +126,7 @@ UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool tx
         if(txDetails)
         {
             UniValue objTx(UniValue::VOBJ);
-            TxToUniv(*tx, uint256(), objTx);
+            TxToUniv(*tx, uint256(), objTx, true, RPCSerializationFlags());
             txs.push_back(objTx);
         }
         else
@@ -343,6 +344,7 @@ std::string EntryDescriptionString()
            "    \"ancestorcount\" : n,    (numeric) number of in-mempool ancestor transactions (including this one)\n"
            "    \"ancestorsize\" : n,     (numeric) virtual transaction size of in-mempool ancestors (including this one)\n"
            "    \"ancestorfees\" : n,     (numeric) modified fees (see above) of in-mempool ancestors (including this one)\n"
+           "    \"wtxid\" : hash,         (string) hash of serialized transaction, including witness data\n"
            "    \"depends\" : [           (array) unconfirmed transactions used as inputs for this transaction\n"
            "        \"transactionid\",    (string) parent transaction id\n"
            "       ... ]\n";
@@ -363,6 +365,7 @@ void entryToJSON(UniValue &info, const CTxMemPoolEntry &e)
     info.push_back(Pair("ancestorcount", e.GetCountWithAncestors()));
     info.push_back(Pair("ancestorsize", e.GetSizeWithAncestors()));
     info.push_back(Pair("ancestorfees", e.GetModFeesWithAncestors()));
+    info.push_back(Pair("wtxid", mempool.vTxHashes[e.vTxHashesIdx].first.ToString()));
     const CTransaction& tx = e.GetTx();
     std::set<std::string> setDepends;
     for (const CTxIn& txin : tx.vin)
@@ -812,6 +815,7 @@ static void ApplyStats(CCoinsStats &stats, CHashWriter& ss, const uint256& hash,
 static bool GetUTXOStats(CCoinsView *view, CCoinsStats &stats)
 {
     std::unique_ptr<CCoinsViewCursor> pcursor(view->Cursor());
+    assert(pcursor);
 
     CHashWriter ss(SER_GETHASH, PROTOCOL_VERSION);
     stats.hashBlock = pcursor->GetBestBlock();
@@ -944,9 +948,10 @@ UniValue gettxout(const JSONRPCRequest& request)
             "gettxout \"txid\" n ( include_mempool )\n"
             "\nReturns details about an unspent transaction output.\n"
             "\nArguments:\n"
-            "1. \"txid\"       (string, required) The transaction id\n"
-            "2. n              (numeric, required) vout number\n"
-            "3. include_mempool  (boolean, optional) Whether to include the mempool\n"
+            "1. \"txid\"             (string, required) The transaction id\n"
+            "2. \"n\"                (numeric, required) vout number\n"
+            "3. \"include_mempool\"  (boolean, optional) Whether to include the mempool. Default: true."
+            "     Note that an unspent output that is spent in the mempool won't appear.\n"
             "\nResult:\n"
             "{\n"
             "  \"bestblock\" : \"hash\",    (string) the block hash\n"
@@ -962,7 +967,6 @@ UniValue gettxout(const JSONRPCRequest& request)
             "        ,...\n"
             "     ]\n"
             "  },\n"
-            "  \"version\" : n,            (numeric) The version\n"
             "  \"coinbase\" : true|false   (boolean) Coinbase or not\n"
             "}\n"
 
@@ -1019,8 +1023,8 @@ UniValue gettxout(const JSONRPCRequest& request)
 
 UniValue verifychain(const JSONRPCRequest& request)
 {
-    int nCheckLevel = GetArg("-checklevel", DEFAULT_CHECKLEVEL);
-    int nCheckDepth = GetArg("-checkblocks", DEFAULT_CHECKBLOCKS);
+    int nCheckLevel = gArgs.GetArg("-checklevel", DEFAULT_CHECKLEVEL);
+    int nCheckDepth = gArgs.GetArg("-checkblocks", DEFAULT_CHECKBLOCKS);
     if (request.fHelp || request.params.size() > 2)
         throw std::runtime_error(
             "verifychain ( checklevel nblocks )\n"
@@ -1132,8 +1136,11 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
             "  \"mediantime\": xxxxxx,     (numeric) median time for the current best block\n"
             "  \"verificationprogress\": xxxx, (numeric) estimate of verification progress [0..1]\n"
             "  \"chainwork\": \"xxxx\"     (string) total amount of work in active chain, in hexadecimal\n"
+            "  \"size_on_disk\": xxxxxx,   (numeric) the estimated size of the block and undo files on disk\n"
             "  \"pruned\": xx,             (boolean) if the blocks are subject to pruning\n"
-            "  \"pruneheight\": xxxxxx,    (numeric) lowest-height complete block stored\n"
+            "  \"pruneheight\": xxxxxx,    (numeric) lowest-height complete block stored (only present if pruning is enabled)\n"
+            "  \"automatic_pruning\": xx,  (boolean) whether automatic pruning is enabled (only present if pruning is enabled)\n"
+            "  \"prune_target_size\": xxxxxx,  (numeric) the target size used by pruning (only present if automatic pruning is enabled)\n"
             "  \"softforks\": [            (array) status of softforks in progress\n"
             "     {\n"
             "        \"id\": \"xxxx\",        (string) name of softfork\n"
@@ -1159,6 +1166,7 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
             "        }\n"
             "     }\n"
             "  }\n"
+            "  \"warnings\" : \"...\",         (string) any network and blockchain warnings.\n"
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("getblockchaininfo", "")
@@ -1176,7 +1184,24 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
     obj.push_back(Pair("mediantime",            (int64_t)chainActive.Tip()->GetMedianTimePast()));
     obj.push_back(Pair("verificationprogress",  GuessVerificationProgress(Params().TxData(), chainActive.Tip())));
     obj.push_back(Pair("chainwork",             chainActive.Tip()->nChainWork.GetHex()));
+    obj.push_back(Pair("size_on_disk",          CalculateCurrentUsage()));
     obj.push_back(Pair("pruned",                fPruneMode));
+    if (fPruneMode) {
+        CBlockIndex* block = chainActive.Tip();
+        assert(block);
+        while (block->pprev && (block->pprev->nStatus & BLOCK_HAVE_DATA)) {
+            block = block->pprev;
+        }
+
+        obj.push_back(Pair("pruneheight",        block->nHeight));
+
+        // if 0, execution bypasses the whole if block.
+        bool automatic_pruning = (gArgs.GetArg("-prune", 0) != 1);
+        obj.push_back(Pair("automatic_pruning",  automatic_pruning));
+        if (automatic_pruning) {
+            obj.push_back(Pair("prune_target_size",  nPruneTarget));
+        }
+    }
 
     const Consensus::Params& consensusParams = Params().GetConsensus();
     CBlockIndex* tip = chainActive.Tip();
@@ -1190,14 +1215,7 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
     obj.push_back(Pair("softforks",             softforks));
     obj.push_back(Pair("bip9_softforks", bip9_softforks));
 
-    if (fPruneMode)
-    {
-        CBlockIndex *block = chainActive.Tip();
-        while (block && block->pprev && (block->pprev->nStatus & BLOCK_HAVE_DATA))
-            block = block->pprev;
-
-        obj.push_back(Pair("pruneheight",        block->nHeight));
-    }
+    obj.push_back(Pair("warnings", GetWarnings("statusbar")));
     return obj;
 }
 
@@ -1325,7 +1343,7 @@ UniValue mempoolInfoToJSON()
     ret.push_back(Pair("size", (int64_t) mempool.size()));
     ret.push_back(Pair("bytes", (int64_t) mempool.GetTotalTxSize()));
     ret.push_back(Pair("usage", (int64_t) mempool.DynamicMemoryUsage()));
-    size_t maxmempool = GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
+    size_t maxmempool = gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
     ret.push_back(Pair("maxmempool", (int64_t) maxmempool));
     ret.push_back(Pair("mempoolminfee", ValueFromAmount(mempool.GetMinFee(maxmempool).GetFeePerK())));
 
@@ -1344,7 +1362,7 @@ UniValue getmempoolinfo(const JSONRPCRequest& request)
             "  \"bytes\": xxxxx,              (numeric) Sum of all virtual transaction sizes as defined in BIP 141. Differs from actual serialized size because witness data is discounted\n"
             "  \"usage\": xxxxx,              (numeric) Total memory usage for the mempool\n"
             "  \"maxmempool\": xxxxx,         (numeric) Maximum memory usage for the mempool\n"
-            "  \"mempoolminfee\": xxxxx       (numeric) Minimum feerate (" + CURRENCY_UNIT + " per KB) for tx to be accepted\n"
+            "  \"mempoolminfee\": xxxxx       (numeric) Minimum fee rate in " + CURRENCY_UNIT + "/kB for tx to be accepted\n"
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("getmempoolinfo", "")
@@ -1478,9 +1496,12 @@ UniValue getchaintxstats(const JSONRPCRequest& request)
             "2. \"blockhash\"  (string, optional) The hash of the block that ends the window.\n"
             "\nResult:\n"
             "{\n"
-            "  \"time\": xxxxx,        (numeric) The timestamp for the statistics in UNIX format.\n"
-            "  \"txcount\": xxxxx,     (numeric) The total number of transactions in the chain up to that point.\n"
-            "  \"txrate\": x.xx,       (numeric) The average rate of transactions per second in the window.\n"
+            "  \"time\": xxxxx,                (numeric) The timestamp for the final block in the window in UNIX format.\n"
+            "  \"txcount\": xxxxx,             (numeric) The total number of transactions in the chain up to that point.\n"
+            "  \"window_block_count\": xxxxx,  (numeric) Size of the window in number of blocks.\n"
+            "  \"window_tx_count\": xxxxx,     (numeric) The number of transactions in the window. Only returned if \"window_block_count\" is > 0.\n"
+            "  \"window_interval\": xxxxx,     (numeric) The elapsed time in the window in seconds. Only returned if \"window_block_count\" is > 0.\n"
+            "  \"txrate\": x.xx,               (numeric) The average rate of transactions per second in the window. Only returned if \"window_interval\" is > 0.\n"
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("getchaintxstats", "")
@@ -1490,11 +1511,7 @@ UniValue getchaintxstats(const JSONRPCRequest& request)
     const CBlockIndex* pindex;
     int blockcount = 30 * 24 * 60 * 60 / Params().GetConsensus().nPowTargetSpacing; // By default: 1 month
 
-    if (request.params.size() > 0 && !request.params[0].isNull()) {
-        blockcount = request.params[0].get_int();
-    }
-
-    bool havehash = request.params.size() > 1 && !request.params[1].isNull();
+    bool havehash = !request.params[1].isNull();
     uint256 hash;
     if (havehash) {
         hash = uint256S(request.params[1].get_str());
@@ -1515,9 +1532,17 @@ UniValue getchaintxstats(const JSONRPCRequest& request)
             pindex = chainActive.Tip();
         }
     }
+    
+    assert(pindex != nullptr);
+
+    if (request.params[0].isNull()) {
+        blockcount = std::max(0, std::min(blockcount, pindex->nHeight - 1));
+    } else {
+        blockcount = request.params[0].get_int();
 
-    if (blockcount < 1 || blockcount >= pindex->nHeight) {
-        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid block count: should be between 1 and the block's height");
+        if (blockcount < 0 || (blockcount > 0 && blockcount >= pindex->nHeight)) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid block count: should be between 0 and the block's height - 1");
+        }
     }
 
     const CBlockIndex* pindexPast = pindex->GetAncestor(pindex->nHeight - blockcount);
@@ -1527,41 +1552,68 @@ UniValue getchaintxstats(const JSONRPCRequest& request)
     UniValue ret(UniValue::VOBJ);
     ret.push_back(Pair("time", (int64_t)pindex->nTime));
     ret.push_back(Pair("txcount", (int64_t)pindex->nChainTx));
-    ret.push_back(Pair("txrate", ((double)nTxDiff) / nTimeDiff));
+    ret.push_back(Pair("window_block_count", blockcount));
+    if (blockcount > 0) {
+        ret.push_back(Pair("window_tx_count", nTxDiff));
+        ret.push_back(Pair("window_interval", nTimeDiff));
+        if (nTimeDiff > 0) {
+            ret.push_back(Pair("txrate", ((double)nTxDiff) / nTimeDiff));
+        }
+    }
 
     return ret;
 }
 
+UniValue savemempool(const JSONRPCRequest& request)
+{
+    if (request.fHelp || request.params.size() != 0) {
+        throw std::runtime_error(
+            "savemempool\n"
+            "\nDumps the mempool to disk.\n"
+            "\nExamples:\n"
+            + HelpExampleCli("savemempool", "")
+            + HelpExampleRpc("savemempool", "")
+        );
+    }
+
+    if (!DumpMempool()) {
+        throw JSONRPCError(RPC_MISC_ERROR, "Unable to dump mempool to disk");
+    }
+
+    return NullUniValue;
+}
+
 static const CRPCCommand commands[] =
-{ //  category              name                      actor (function)         okSafe argNames
-  //  --------------------- ------------------------  -----------------------  ------ ----------
-    { "blockchain",         "getblockchaininfo",      &getblockchaininfo,      true,  {} },
-    { "blockchain",         "getchaintxstats",        &getchaintxstats,        true,  {"nblocks", "blockhash"} },
-    { "blockchain",         "getbestblockhash",       &getbestblockhash,       true,  {} },
-    { "blockchain",         "getblockcount",          &getblockcount,          true,  {} },
-    { "blockchain",         "getblock",               &getblock,               true,  {"blockhash","verbosity|verbose"} },
-    { "blockchain",         "getblockhash",           &getblockhash,           true,  {"height"} },
-    { "blockchain",         "getblockheader",         &getblockheader,         true,  {"blockhash","verbose"} },
-    { "blockchain",         "getchaintips",           &getchaintips,           true,  {} },
-    { "blockchain",         "getdifficulty",          &getdifficulty,          true,  {} },
-    { "blockchain",         "getmempoolancestors",    &getmempoolancestors,    true,  {"txid","verbose"} },
-    { "blockchain",         "getmempooldescendants",  &getmempooldescendants,  true,  {"txid","verbose"} },
-    { "blockchain",         "getmempoolentry",        &getmempoolentry,        true,  {"txid"} },
-    { "blockchain",         "getmempoolinfo",         &getmempoolinfo,         true,  {} },
-    { "blockchain",         "getrawmempool",          &getrawmempool,          true,  {"verbose"} },
-    { "blockchain",         "gettxout",               &gettxout,               true,  {"txid","n","include_mempool"} },
-    { "blockchain",         "gettxoutsetinfo",        &gettxoutsetinfo,        true,  {} },
-    { "blockchain",         "pruneblockchain",        &pruneblockchain,        true,  {"height"} },
-    { "blockchain",         "verifychain",            &verifychain,            true,  {"checklevel","nblocks"} },
-
-    { "blockchain",         "preciousblock",          &preciousblock,          true,  {"blockhash"} },
+{ //  category              name                      actor (function)         argNames
+  //  --------------------- ------------------------  -----------------------  ----------
+    { "blockchain",         "getblockchaininfo",      &getblockchaininfo,      {} },
+    { "blockchain",         "getchaintxstats",        &getchaintxstats,        {"nblocks", "blockhash"} },
+    { "blockchain",         "getbestblockhash",       &getbestblockhash,       {} },
+    { "blockchain",         "getblockcount",          &getblockcount,          {} },
+    { "blockchain",         "getblock",               &getblock,               {"blockhash","verbosity|verbose"} },
+    { "blockchain",         "getblockhash",           &getblockhash,           {"height"} },
+    { "blockchain",         "getblockheader",         &getblockheader,         {"blockhash","verbose"} },
+    { "blockchain",         "getchaintips",           &getchaintips,           {} },
+    { "blockchain",         "getdifficulty",          &getdifficulty,          {} },
+    { "blockchain",         "getmempoolancestors",    &getmempoolancestors,    {"txid","verbose"} },
+    { "blockchain",         "getmempooldescendants",  &getmempooldescendants,  {"txid","verbose"} },
+    { "blockchain",         "getmempoolentry",        &getmempoolentry,        {"txid"} },
+    { "blockchain",         "getmempoolinfo",         &getmempoolinfo,         {} },
+    { "blockchain",         "getrawmempool",          &getrawmempool,          {"verbose"} },
+    { "blockchain",         "gettxout",               &gettxout,               {"txid","n","include_mempool"} },
+    { "blockchain",         "gettxoutsetinfo",        &gettxoutsetinfo,        {} },
+    { "blockchain",         "pruneblockchain",        &pruneblockchain,        {"height"} },
+    { "blockchain",         "savemempool",            &savemempool,            {} },
+    { "blockchain",         "verifychain",            &verifychain,            {"checklevel","nblocks"} },
+
+    { "blockchain",         "preciousblock",          &preciousblock,          {"blockhash"} },
 
     /* Not shown in help */
-    { "hidden",             "invalidateblock",        &invalidateblock,        true,  {"blockhash"} },
-    { "hidden",             "reconsiderblock",        &reconsiderblock,        true,  {"blockhash"} },
-    { "hidden",             "waitfornewblock",        &waitfornewblock,        true,  {"timeout"} },
-    { "hidden",             "waitforblock",           &waitforblock,           true,  {"blockhash","timeout"} },
-    { "hidden",             "waitforblockheight",     &waitforblockheight,     true,  {"height","timeout"} },
+    { "hidden",             "invalidateblock",        &invalidateblock,        {"blockhash"} },
+    { "hidden",             "reconsiderblock",        &reconsiderblock,        {"blockhash"} },
+    { "hidden",             "waitfornewblock",        &waitfornewblock,        {"timeout"} },
+    { "hidden",             "waitforblock",           &waitforblock,           {"blockhash","timeout"} },
+    { "hidden",             "waitforblockheight",     &waitforblockheight,     {"height","timeout"} },
 };
 
 void RegisterBlockchainRPCCommands(CRPCTable &t)
diff --git a/src/rpc/client.cpp b/src/rpc/client.cpp
index 417945378..721f363ae 100644
--- a/src/rpc/client.cpp
+++ b/src/rpc/client.cpp
@@ -115,8 +115,8 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "keypoolrefill", 0, "newsize" },
     { "getrawmempool", 0, "verbose" },
     { "estimatefee", 0, "nblocks" },
-    { "estimatesmartfee", 0, "nblocks" },
-    { "estimaterawfee", 0, "nblocks" },
+    { "estimatesmartfee", 0, "conf_target" },
+    { "estimaterawfee", 0, "conf_target" },
     { "estimaterawfee", 1, "threshold" },
     { "prioritisetransaction", 1, "dummy" },
     { "prioritisetransaction", 2, "fee_delta" },
@@ -129,6 +129,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "logging", 0, "include" },
     { "logging", 1, "exclude" },
     { "disconnectnode", 1, "nodeid" },
+    { "addwitnessaddress", 1, "p2sh" },
     // Echo with conversion (For testing only)
     { "echojson", 0, "arg0" },
     { "echojson", 1, "arg1" },
@@ -140,6 +141,8 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "echojson", 7, "arg7" },
     { "echojson", 8, "arg8" },
     { "echojson", 9, "arg9" },
+    { "rescanblockchain", 0, "start_height"},
+    { "rescanblockchain", 1, "stop_height"},
 };
 
 class CRPCConvertTable
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 77b87486c..83412cb33 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -52,7 +52,7 @@ UniValue GetNetworkHashPS(int lookup, int height) {
     if (height >= 0 && height < chainActive.Height())
         pb = chainActive[height];
 
-    if (pb == NULL || !pb->nHeight)
+    if (pb == nullptr || !pb->nHeight)
         return 0;
 
     // If lookup is -1, then use blocks since last difficulty change.
@@ -139,7 +139,7 @@ UniValue generateBlocks(std::shared_ptr<CReserveScript> coinbaseScript, int nGen
             continue;
         }
         std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(*pblock);
-        if (!ProcessNewBlock(Params(), shared_pblock, true, NULL))
+        if (!ProcessNewBlock(Params(), shared_pblock, true, nullptr))
             throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted");
         ++nHeight;
         blockHashes.push_back(pblock->GetHash().GetHex());
@@ -176,12 +176,13 @@ UniValue generatetoaddress(const JSONRPCRequest& request)
         nMaxTries = request.params[2].get_int();
     }
 
-    CBitcoinAddress address(request.params[1].get_str());
-    if (!address.IsValid())
+    CTxDestination destination = DecodeDestination(request.params[1].get_str());
+    if (!IsValidDestination(destination)) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Error: Invalid address");
+    }
 
     std::shared_ptr<CReserveScript> coinbaseScript = std::make_shared<CReserveScript>();
-    coinbaseScript->reserveScript = GetScriptForDestination(address.Get());
+    coinbaseScript->reserveScript = GetScriptForDestination(destination);
 
     return generateBlocks(coinbaseScript, nGenerate, nMaxTries, false);
 }
@@ -195,14 +196,14 @@ UniValue getmininginfo(const JSONRPCRequest& request)
             "\nResult:\n"
             "{\n"
             "  \"blocks\": nnn,             (numeric) The current block\n"
-            "  \"currentblocksize\": nnn,   (numeric) The last block size\n"
             "  \"currentblockweight\": nnn, (numeric) The last block weight\n"
             "  \"currentblocktx\": nnn,     (numeric) The last block transaction\n"
             "  \"difficulty\": xxx.xxxxx    (numeric) The current difficulty\n"
-            "  \"errors\": \"...\"            (string) Current errors\n"
             "  \"networkhashps\": nnn,      (numeric) The network hashes per second\n"
             "  \"pooledtx\": n              (numeric) The size of the mempool\n"
             "  \"chain\": \"xxxx\",           (string) current network name as defined in BIP70 (main, test, regtest)\n"
+            "  \"warnings\": \"...\"          (string) any network and blockchain warnings\n"
+            "  \"errors\": \"...\"            (string) DEPRECATED. Same as warnings. Only shown when bitcoind is started with -deprecatedrpc=getmininginfo\n"
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("getmininginfo", "")
@@ -214,14 +215,17 @@ UniValue getmininginfo(const JSONRPCRequest& request)
 
     UniValue obj(UniValue::VOBJ);
     obj.push_back(Pair("blocks",           (int)chainActive.Height()));
-    obj.push_back(Pair("currentblocksize", (uint64_t)nLastBlockSize));
     obj.push_back(Pair("currentblockweight", (uint64_t)nLastBlockWeight));
     obj.push_back(Pair("currentblocktx",   (uint64_t)nLastBlockTx));
     obj.push_back(Pair("difficulty",       (double)GetDifficulty()));
-    obj.push_back(Pair("errors",           GetWarnings("statusbar")));
     obj.push_back(Pair("networkhashps",    getnetworkhashps(request)));
     obj.push_back(Pair("pooledtx",         (uint64_t)mempool.size()));
     obj.push_back(Pair("chain",            Params().NetworkIDString()));
+    if (IsDeprecatedRPCEnabled("getmininginfo")) {
+        obj.push_back(Pair("errors",       GetWarnings("statusbar")));
+    } else {
+        obj.push_back(Pair("warnings",     GetWarnings("statusbar")));
+    }
     return obj;
 }
 
@@ -336,7 +340,7 @@ UniValue getblocktemplate(const JSONRPCRequest& request)
             "             n                          (numeric) transactions before this one (by 1-based index in 'transactions' list) that must be present in the final block if this one is\n"
             "             ,...\n"
             "         ],\n"
-            "         \"fee\": n,                    (numeric) difference in value between transaction inputs and outputs (in Satoshis); for coinbase transactions, this is a negative Number of the total collected block fees (ie, not including the block subsidy); if key is not present, fee is unknown and clients MUST NOT assume there isn't one\n"
+            "         \"fee\": n,                    (numeric) difference in value between transaction inputs and outputs (in satoshis); for coinbase transactions, this is a negative Number of the total collected block fees (ie, not including the block subsidy); if key is not present, fee is unknown and clients MUST NOT assume there isn't one\n"
             "         \"sigops\" : n,                (numeric) total SigOps cost, as counted for purposes of block limits; if key is not present, sigop cost is unknown and clients MUST NOT assume it is zero\n"
             "         \"weight\" : n,                (numeric) total transaction weight, as counted for purposes of block limits\n"
             "         \"required\" : true|false      (boolean) if provided and true, this transaction must be in the final block\n"
@@ -346,7 +350,7 @@ UniValue getblocktemplate(const JSONRPCRequest& request)
             "  \"coinbaseaux\" : {                 (json object) data that should be included in the coinbase's scriptSig content\n"
             "      \"flags\" : \"xx\"                  (string) key name is to be ignored, and value included in scriptSig\n"
             "  },\n"
-            "  \"coinbasevalue\" : n,              (numeric) maximum allowable input to coinbase transaction, including the generation award and transaction fees (in Satoshis)\n"
+            "  \"coinbasevalue\" : n,              (numeric) maximum allowable input to coinbase transaction, including the generation award and transaction fees (in satoshis)\n"
             "  \"coinbasetxn\" : { ... },          (json object) information for coinbase transaction\n"
             "  \"target\" : \"xxxx\",                (string) The hash target\n"
             "  \"mintime\" : xxx,                  (numeric) The minimum timestamp appropriate for next block time in seconds since epoch (Jan 1 1970 GMT)\n"
@@ -686,7 +690,7 @@ class submitblock_StateCatcher : public CValidationInterface
     bool found;
     CValidationState state;
 
-    submitblock_StateCatcher(const uint256 &hashIn) : hash(hashIn), found(false), state() {}
+    explicit submitblock_StateCatcher(const uint256 &hashIn) : hash(hashIn), found(false), state() {}
 
 protected:
     void BlockChecked(const CBlock& block, const CValidationState& stateIn) override {
@@ -754,7 +758,7 @@ UniValue submitblock(const JSONRPCRequest& request)
 
     submitblock_StateCatcher sc(block.GetHash());
     RegisterValidationInterface(&sc);
-    bool fAccepted = ProcessNewBlock(Params(), blockptr, true, NULL);
+    bool fAccepted = ProcessNewBlock(Params(), blockptr, true, nullptr);
     UnregisterValidationInterface(&sc);
     if (fBlockPresent) {
         if (fAccepted && !sc.found) {
@@ -790,6 +794,12 @@ UniValue estimatefee(const JSONRPCRequest& request)
             + HelpExampleCli("estimatefee", "6")
             );
 
+    if (!IsDeprecatedRPCEnabled("estimatefee")) {
+        throw JSONRPCError(RPC_METHOD_DEPRECATED, "estimatefee is deprecated and will be fully removed in v0.17. "
+            "To use estimatefee in v0.16, restart bitcoind with -deprecatedrpc=estimatefee.\n"
+            "Projects should transition to using estimatesmartfee before upgrading to v0.17");
+    }
+
     RPCTypeCheck(request.params, {UniValue::VNUM});
 
     int nBlocks = request.params[0].get_int();
@@ -825,7 +835,7 @@ UniValue estimatesmartfee(const JSONRPCRequest& request)
             "       \"CONSERVATIVE\"\n"
             "\nResult:\n"
             "{\n"
-            "  \"feerate\" : x.x,     (numeric, optional) estimate fee-per-kilobyte (in BTC)\n"
+            "  \"feerate\" : x.x,     (numeric, optional) estimate fee rate in " + CURRENCY_UNIT + "/kB\n"
             "  \"errors\": [ str... ] (json array of strings, optional) Errors encountered during processing\n"
             "  \"blocks\" : n         (numeric) block number where estimate was found\n"
             "}\n"
@@ -842,7 +852,7 @@ UniValue estimatesmartfee(const JSONRPCRequest& request)
     RPCTypeCheckArgument(request.params[0], UniValue::VNUM);
     unsigned int conf_target = ParseConfirmTarget(request.params[0]);
     bool conservative = true;
-    if (request.params.size() > 1 && !request.params[1].isNull()) {
+    if (!request.params[1].isNull()) {
         FeeEstimateMode fee_mode;
         if (!FeeModeFromString(request.params[1].get_str(), fee_mode)) {
             throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid estimate_mode parameter");
@@ -884,7 +894,7 @@ UniValue estimaterawfee(const JSONRPCRequest& request)
             "\nResult:\n"
             "{\n"
             "  \"short\" : {            (json object, optional) estimate for short time horizon\n"
-            "      \"feerate\" : x.x,        (numeric, optional) estimate fee-per-kilobyte (in BTC)\n"
+            "      \"feerate\" : x.x,        (numeric, optional) estimate fee rate in " + CURRENCY_UNIT + "/kB\n"
             "      \"decay\" : x.x,          (numeric) exponential decay (per block) for historical moving average of confirmation data\n"
             "      \"scale\" : x,            (numeric) The resolution of confirmation targets at this time horizon\n"
             "      \"pass\" : {              (json object, optional) information about the lowest range of feerates to succeed in meeting the threshold\n"
@@ -967,20 +977,21 @@ UniValue estimaterawfee(const JSONRPCRequest& request)
 }
 
 static const CRPCCommand commands[] =
-{ //  category              name                      actor (function)         okSafeMode
+{ //  category              name                      actor (function)         argNames
   //  --------------------- ------------------------  -----------------------  ----------
-    { "mining",             "getnetworkhashps",       &getnetworkhashps,       true,  {"nblocks","height"} },
-    { "mining",             "getmininginfo",          &getmininginfo,          true,  {} },
-    { "mining",             "prioritisetransaction",  &prioritisetransaction,  true,  {"txid","dummy","fee_delta"} },
-    { "mining",             "getblocktemplate",       &getblocktemplate,       true,  {"template_request"} },
-    { "mining",             "submitblock",            &submitblock,            true,  {"hexdata","dummy"} },
+    { "mining",             "getnetworkhashps",       &getnetworkhashps,       {"nblocks","height"} },
+    { "mining",             "getmininginfo",          &getmininginfo,          {} },
+    { "mining",             "prioritisetransaction",  &prioritisetransaction,  {"txid","dummy","fee_delta"} },
+    { "mining",             "getblocktemplate",       &getblocktemplate,       {"template_request"} },
+    { "mining",             "submitblock",            &submitblock,            {"hexdata","dummy"} },
+
 
-    { "generating",         "generatetoaddress",      &generatetoaddress,      true,  {"nblocks","address","maxtries"} },
+    { "generating",         "generatetoaddress",      &generatetoaddress,      {"nblocks","address","maxtries"} },
 
-    { "util",               "estimatefee",            &estimatefee,            true,  {"nblocks"} },
-    { "util",               "estimatesmartfee",       &estimatesmartfee,       true,  {"conf_target", "estimate_mode"} },
+    { "util",               "estimatefee",            &estimatefee,            {"nblocks"} },
+    { "util",               "estimatesmartfee",       &estimatesmartfee,       {"conf_target", "estimate_mode"} },
 
-    { "hidden",             "estimaterawfee",         &estimaterawfee,         true,  {"conf_target", "threshold"} },
+    { "hidden",             "estimaterawfee",         &estimaterawfee,         {"conf_target", "threshold"} },
 };
 
 void RegisterMiningRPCCommands(CRPCTable &t)
diff --git a/src/rpc/misc.cpp b/src/rpc/misc.cpp
index cd93919eb..521b49e2a 100644
--- a/src/rpc/misc.cpp
+++ b/src/rpc/misc.cpp
@@ -7,6 +7,7 @@
 #include "chain.h"
 #include "clientversion.h"
 #include "core_io.h"
+#include "crypto/ripemd160.h"
 #include "init.h"
 #include "validation.h"
 #include "httpserver.h"
@@ -31,101 +32,13 @@
 
 #include <univalue.h>
 
-/**
- * @note Do not add or change anything in the information returned by this
- * method. `getinfo` exists for backwards-compatibility only. It combines
- * information from wildly different sources in the program, which is a mess,
- * and is thus planned to be deprecated eventually.
- *
- * Based on the source of the information, new information should be added to:
- * - `getblockchaininfo`,
- * - `getnetworkinfo` or
- * - `getwalletinfo`
- *
- * Or alternatively, create a specific query method for the information.
- **/
-UniValue getinfo(const JSONRPCRequest& request)
-{
-    if (request.fHelp || request.params.size() != 0)
-        throw std::runtime_error(
-            "getinfo\n"
-            "\nDEPRECATED. Returns an object containing various state info.\n"
-            "\nResult:\n"
-            "{\n"
-            "  \"deprecation-warning\": \"...\" (string) warning that the getinfo command is deprecated and will be removed in 0.16\n"
-            "  \"version\": xxxxx,           (numeric) the server version\n"
-            "  \"protocolversion\": xxxxx,   (numeric) the protocol version\n"
-            "  \"walletversion\": xxxxx,     (numeric) the wallet version\n"
-            "  \"balance\": xxxxxxx,         (numeric) the total bitcoin balance of the wallet\n"
-            "  \"blocks\": xxxxxx,           (numeric) the current number of blocks processed in the server\n"
-            "  \"timeoffset\": xxxxx,        (numeric) the time offset\n"
-            "  \"connections\": xxxxx,       (numeric) the number of connections\n"
-            "  \"proxy\": \"host:port\",       (string, optional) the proxy used by the server\n"
-            "  \"difficulty\": xxxxxx,       (numeric) the current difficulty\n"
-            "  \"testnet\": true|false,      (boolean) if the server is using testnet or not\n"
-            "  \"keypoololdest\": xxxxxx,    (numeric) the timestamp (seconds since Unix epoch) of the oldest pre-generated key in the key pool\n"
-            "  \"keypoolsize\": xxxx,        (numeric) how many new keys are pre-generated\n"
-            "  \"unlocked_until\": ttt,      (numeric) the timestamp in seconds since epoch (midnight Jan 1 1970 GMT) that the wallet is unlocked for transfers, or 0 if the wallet is locked\n"
-            "  \"paytxfee\": x.xxxx,         (numeric) the transaction fee set in " + CURRENCY_UNIT + "/kB\n"
-            "  \"relayfee\": x.xxxx,         (numeric) minimum relay fee for transactions in " + CURRENCY_UNIT + "/kB\n"
-            "  \"errors\": \"...\"             (string) any error messages\n"
-            "}\n"
-            "\nExamples:\n"
-            + HelpExampleCli("getinfo", "")
-            + HelpExampleRpc("getinfo", "")
-        );
-
-#ifdef ENABLE_WALLET
-    CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
-
-    LOCK2(cs_main, pwallet ? &pwallet->cs_wallet : NULL);
-#else
-    LOCK(cs_main);
-#endif
-
-    proxyType proxy;
-    GetProxy(NET_IPV4, proxy);
-
-    UniValue obj(UniValue::VOBJ);
-    obj.push_back(Pair("deprecation-warning", "WARNING: getinfo is deprecated and will be fully removed in 0.16."
-        " Projects should transition to using getblockchaininfo, getnetworkinfo, and getwalletinfo before upgrading to 0.16"));
-    obj.push_back(Pair("version", CLIENT_VERSION));
-    obj.push_back(Pair("protocolversion", PROTOCOL_VERSION));
-#ifdef ENABLE_WALLET
-    if (pwallet) {
-        obj.push_back(Pair("walletversion", pwallet->GetVersion()));
-        obj.push_back(Pair("balance",       ValueFromAmount(pwallet->GetBalance())));
-    }
-#endif
-    obj.push_back(Pair("blocks",        (int)chainActive.Height()));
-    obj.push_back(Pair("timeoffset",    GetTimeOffset()));
-    if(g_connman)
-        obj.push_back(Pair("connections",   (int)g_connman->GetNodeCount(CConnman::CONNECTIONS_ALL)));
-    obj.push_back(Pair("proxy",         (proxy.IsValid() ? proxy.proxy.ToStringIPPort() : std::string())));
-    obj.push_back(Pair("difficulty",    (double)GetDifficulty()));
-    obj.push_back(Pair("testnet",       Params().NetworkIDString() == CBaseChainParams::TESTNET));
-#ifdef ENABLE_WALLET
-    if (pwallet) {
-        obj.push_back(Pair("keypoololdest", pwallet->GetOldestKeyPoolTime()));
-        obj.push_back(Pair("keypoolsize",   (int)pwallet->GetKeyPoolSize()));
-    }
-    if (pwallet && pwallet->IsCrypted()) {
-        obj.push_back(Pair("unlocked_until", pwallet->nRelockTime));
-    }
-    obj.push_back(Pair("paytxfee",      ValueFromAmount(payTxFee.GetFeePerK())));
-#endif
-    obj.push_back(Pair("relayfee",      ValueFromAmount(::minRelayTxFee.GetFeePerK())));
-    obj.push_back(Pair("errors",        GetWarnings("statusbar")));
-    return obj;
-}
-
 #ifdef ENABLE_WALLET
 class DescribeAddressVisitor : public boost::static_visitor<UniValue>
 {
 public:
     CWallet * const pwallet;
 
-    DescribeAddressVisitor(CWallet *_pwallet) : pwallet(_pwallet) {}
+    explicit DescribeAddressVisitor(CWallet *_pwallet) : pwallet(_pwallet) {}
 
     UniValue operator()(const CNoDestination &dest) const { return UniValue(UniValue::VOBJ); }
 
@@ -133,6 +46,7 @@ class DescribeAddressVisitor : public boost::static_visitor<UniValue>
         UniValue obj(UniValue::VOBJ);
         CPubKey vchPubKey;
         obj.push_back(Pair("isscript", false));
+        obj.push_back(Pair("iswitness", false));
         if (pwallet && pwallet->GetPubKey(keyID, vchPubKey)) {
             obj.push_back(Pair("pubkey", HexStr(vchPubKey)));
             obj.push_back(Pair("iscompressed", vchPubKey.IsCompressed()));
@@ -144,6 +58,7 @@ class DescribeAddressVisitor : public boost::static_visitor<UniValue>
         UniValue obj(UniValue::VOBJ);
         CScript subscript;
         obj.push_back(Pair("isscript", true));
+        obj.push_back(Pair("iswitness", false));
         if (pwallet && pwallet->GetCScript(scriptID, subscript)) {
             std::vector<CTxDestination> addresses;
             txnouttype whichType;
@@ -152,14 +67,56 @@ class DescribeAddressVisitor : public boost::static_visitor<UniValue>
             obj.push_back(Pair("script", GetTxnOutputType(whichType)));
             obj.push_back(Pair("hex", HexStr(subscript.begin(), subscript.end())));
             UniValue a(UniValue::VARR);
-            for (const CTxDestination& addr : addresses)
-                a.push_back(CBitcoinAddress(addr).ToString());
+            for (const CTxDestination& addr : addresses) {
+                a.push_back(EncodeDestination(addr));
+            }
             obj.push_back(Pair("addresses", a));
             if (whichType == TX_MULTISIG)
                 obj.push_back(Pair("sigsrequired", nRequired));
         }
         return obj;
     }
+
+    UniValue operator()(const WitnessV0KeyHash& id) const
+    {
+        UniValue obj(UniValue::VOBJ);
+        CPubKey pubkey;
+        obj.push_back(Pair("isscript", false));
+        obj.push_back(Pair("iswitness", true));
+        obj.push_back(Pair("witness_version", 0));
+        obj.push_back(Pair("witness_program", HexStr(id.begin(), id.end())));
+        if (pwallet && pwallet->GetPubKey(CKeyID(id), pubkey)) {
+            obj.push_back(Pair("pubkey", HexStr(pubkey)));
+        }
+        return obj;
+    }
+
+    UniValue operator()(const WitnessV0ScriptHash& id) const
+    {
+        UniValue obj(UniValue::VOBJ);
+        CScript subscript;
+        obj.push_back(Pair("isscript", true));
+        obj.push_back(Pair("iswitness", true));
+        obj.push_back(Pair("witness_version", 0));
+        obj.push_back(Pair("witness_program", HexStr(id.begin(), id.end())));
+        CRIPEMD160 hasher;
+        uint160 hash;
+        hasher.Write(id.begin(), 32).Finalize(hash.begin());
+        if (pwallet && pwallet->GetCScript(CScriptID(hash), subscript)) {
+            obj.push_back(Pair("hex", HexStr(subscript.begin(), subscript.end())));
+        }
+        return obj;
+    }
+
+    UniValue operator()(const WitnessUnknown& id) const
+    {
+        UniValue obj(UniValue::VOBJ);
+        CScript subscript;
+        obj.push_back(Pair("iswitness", true));
+        obj.push_back(Pair("witness_version", (int)id.version));
+        obj.push_back(Pair("witness_program", HexStr(id.program, id.program + id.length)));
+        return obj;
+    }
 };
 #endif
 
@@ -202,20 +159,19 @@ UniValue validateaddress(const JSONRPCRequest& request)
 #ifdef ENABLE_WALLET
     CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
 
-    LOCK2(cs_main, pwallet ? &pwallet->cs_wallet : NULL);
+    LOCK2(cs_main, pwallet ? &pwallet->cs_wallet : nullptr);
 #else
     LOCK(cs_main);
 #endif
 
-    CBitcoinAddress address(request.params[0].get_str());
-    bool isValid = address.IsValid();
+    CTxDestination dest = DecodeDestination(request.params[0].get_str());
+    bool isValid = IsValidDestination(dest);
 
     UniValue ret(UniValue::VOBJ);
     ret.push_back(Pair("isvalid", isValid));
     if (isValid)
     {
-        CTxDestination dest = address.Get();
-        std::string currentAddress = address.ToString();
+        std::string currentAddress = EncodeDestination(dest);
         ret.push_back(Pair("address", currentAddress));
 
         CScript scriptPubKey = GetScriptForDestination(dest);
@@ -230,10 +186,10 @@ UniValue validateaddress(const JSONRPCRequest& request)
         if (pwallet && pwallet->mapAddressBook.count(dest)) {
             ret.push_back(Pair("account", pwallet->mapAddressBook[dest].name));
         }
-        CKeyID keyID;
         if (pwallet) {
             const auto& meta = pwallet->mapKeyMetadata;
-            auto it = address.GetKeyID(keyID) ? meta.find(keyID) : meta.end();
+            const CKeyID *keyID = boost::get<CKeyID>(&dest);
+            auto it = keyID ? meta.find(*keyID) : meta.end();
             if (it == meta.end()) {
                 it = meta.find(CScriptID(scriptPubKey));
             }
@@ -277,16 +233,15 @@ CScript _createmultisig_redeemScript(CWallet * const pwallet, const UniValue& pa
         const std::string& ks = keys[i].get_str();
 #ifdef ENABLE_WALLET
         // Case 1: Bitcoin address and we have full public key:
-        CBitcoinAddress address(ks);
-        if (pwallet && address.IsValid()) {
-            CKeyID keyID;
-            if (!address.GetKeyID(keyID))
-                throw std::runtime_error(
-                    strprintf("%s does not refer to a key",ks));
+        CTxDestination dest = DecodeDestination(ks);
+        if (pwallet && IsValidDestination(dest)) {
+            const CKeyID *keyID = boost::get<CKeyID>(&dest);
+            if (!keyID) {
+                throw std::runtime_error(strprintf("%s does not refer to a key", ks));
+            }
             CPubKey vchPubKey;
-            if (!pwallet->GetPubKey(keyID, vchPubKey)) {
-                throw std::runtime_error(
-                    strprintf("no full public key for address %s",ks));
+            if (!pwallet->GetPubKey(*keyID, vchPubKey)) {
+                throw std::runtime_error(strprintf("no full public key for address %s", ks));
             }
             if (!vchPubKey.IsFullyValid())
                 throw std::runtime_error(" Invalid public key: "+ks);
@@ -322,7 +277,7 @@ UniValue createmultisig(const JSONRPCRequest& request)
 #ifdef ENABLE_WALLET
     CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
 #else
-    CWallet * const pwallet = NULL;
+    CWallet * const pwallet = nullptr;
 #endif
 
     if (request.fHelp || request.params.size() < 2 || request.params.size() > 2)
@@ -357,10 +312,9 @@ UniValue createmultisig(const JSONRPCRequest& request)
     // Construct using pay-to-script-hash:
     CScript inner = _createmultisig_redeemScript(pwallet, request.params);
     CScriptID innerID(inner);
-    CBitcoinAddress address(innerID);
 
     UniValue result(UniValue::VOBJ);
-    result.push_back(Pair("address", address.ToString()));
+    result.push_back(Pair("address", EncodeDestination(innerID)));
     result.push_back(Pair("redeemScript", HexStr(inner.begin(), inner.end())));
 
     return result;
@@ -395,13 +349,15 @@ UniValue verifymessage(const JSONRPCRequest& request)
     std::string strSign     = request.params[1].get_str();
     std::string strMessage  = request.params[2].get_str();
 
-    CBitcoinAddress addr(strAddress);
-    if (!addr.IsValid())
+    CTxDestination destination = DecodeDestination(strAddress);
+    if (!IsValidDestination(destination)) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Invalid address");
+    }
 
-    CKeyID keyID;
-    if (!addr.GetKeyID(keyID))
+    const CKeyID *keyID = boost::get<CKeyID>(&destination);
+    if (!keyID) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Address does not refer to key");
+    }
 
     bool fInvalid = false;
     std::vector<unsigned char> vchSig = DecodeBase64(strSign.c_str(), &fInvalid);
@@ -417,7 +373,7 @@ UniValue verifymessage(const JSONRPCRequest& request)
     if (!pubkey.RecoverCompact(ss.GetHash(), vchSig))
         return false;
 
-    return (pubkey.GetID() == keyID);
+    return (pubkey.GetID() == *keyID);
 }
 
 UniValue signmessagewithprivkey(const JSONRPCRequest& request)
@@ -459,7 +415,7 @@ UniValue signmessagewithprivkey(const JSONRPCRequest& request)
     if (!key.SignCompact(ss.GetHash(), vchSig))
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Sign failed");
 
-    return EncodeBase64(&vchSig[0], vchSig.size());
+    return EncodeBase64(vchSig.data(), vchSig.size());
 }
 
 UniValue setmocktime(const JSONRPCRequest& request)
@@ -552,7 +508,7 @@ UniValue getmemoryinfo(const JSONRPCRequest& request)
             + HelpExampleRpc("getmemoryinfo", "")
         );
 
-    std::string mode = (request.params.size() < 1 || request.params[0].isNull()) ? "stats" : request.params[0].get_str();
+    std::string mode = request.params[0].isNull() ? "stats" : request.params[0].get_str();
     if (mode == "stats") {
         UniValue obj(UniValue::VOBJ);
         obj.push_back(Pair("locked", RPCLockedMemoryInfo()));
@@ -603,11 +559,11 @@ UniValue logging(const JSONRPCRequest& request)
     }
 
     uint32_t originalLogCategories = logCategories;
-    if (request.params.size() > 0 && request.params[0].isArray()) {
+    if (request.params[0].isArray()) {
         logCategories |= getCategoryMask(request.params[0]);
     }
 
-    if (request.params.size() > 1 && request.params[1].isArray()) {
+    if (request.params[1].isArray()) {
         logCategories &= ~getCategoryMask(request.params[1]);
     }
 
@@ -649,20 +605,19 @@ UniValue echo(const JSONRPCRequest& request)
 }
 
 static const CRPCCommand commands[] =
-{ //  category              name                      actor (function)         okSafeMode
+{ //  category              name                      actor (function)         argNames
   //  --------------------- ------------------------  -----------------------  ----------
-    { "control",            "getinfo",                &getinfo,                true,  {} }, /* uses wallet if enabled */
-    { "control",            "getmemoryinfo",          &getmemoryinfo,          true,  {"mode"} },
-    { "util",               "validateaddress",        &validateaddress,        true,  {"address"} }, /* uses wallet if enabled */
-    { "util",               "createmultisig",         &createmultisig,         true,  {"nrequired","keys"} },
-    { "util",               "verifymessage",          &verifymessage,          true,  {"address","signature","message"} },
-    { "util",               "signmessagewithprivkey", &signmessagewithprivkey, true,  {"privkey","message"} },
+    { "control",            "getmemoryinfo",          &getmemoryinfo,          {"mode"} },
+    { "util",               "validateaddress",        &validateaddress,        {"address"} }, /* uses wallet if enabled */
+    { "util",               "createmultisig",         &createmultisig,         {"nrequired","keys"} },
+    { "util",               "verifymessage",          &verifymessage,          {"address","signature","message"} },
+    { "util",               "signmessagewithprivkey", &signmessagewithprivkey, {"privkey","message"} },
 
     /* Not shown in help */
-    { "hidden",             "setmocktime",            &setmocktime,            true,  {"timestamp"}},
-    { "hidden",             "echo",                   &echo,                   true,  {"arg0","arg1","arg2","arg3","arg4","arg5","arg6","arg7","arg8","arg9"}},
-    { "hidden",             "echojson",               &echo,                   true,  {"arg0","arg1","arg2","arg3","arg4","arg5","arg6","arg7","arg8","arg9"}},
-    { "hidden",             "logging",                &logging,                true,  {"include", "exclude"}},
+    { "hidden",             "setmocktime",            &setmocktime,            {"timestamp"}},
+    { "hidden",             "echo",                   &echo,                   {"arg0","arg1","arg2","arg3","arg4","arg5","arg6","arg7","arg8","arg9"}},
+    { "hidden",             "echojson",               &echo,                   {"arg0","arg1","arg2","arg3","arg4","arg5","arg6","arg7","arg8","arg9"}},
+    { "hidden",             "logging",                &logging,                {"include", "exclude"}},
 };
 
 void RegisterMiscRPCCommands(CRPCTable &t)
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index 6271e0cc8..8fb8328c5 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -92,7 +92,7 @@ UniValue getpeerinfo(const JSONRPCRequest& request)
             "    \"version\": v,              (numeric) The peer version, such as 7001\n"
             "    \"subver\": \"/Satoshi:0.8.5/\",  (string) The string version\n"
             "    \"inbound\": true|false,     (boolean) Inbound (true) or Outbound (false)\n"
-            "    \"addnode\": true|false,     (boolean) Whether connection was due to addnode and is using an addnode slot\n"
+            "    \"addnode\": true|false,     (boolean) Whether connection was due to addnode/-connect or if it was an automatic/inbound connection\n"
             "    \"startingheight\": n,       (numeric) The starting height (block) of the peer\n"
             "    \"banscore\": n,             (numeric) The ban score\n"
             "    \"synced_headers\": n,       (numeric) The last header we have in common with this peer\n"
@@ -146,7 +146,7 @@ UniValue getpeerinfo(const JSONRPCRequest& request)
         obj.push_back(Pair("timeoffset", stats.nTimeOffset));
         if (stats.dPingTime > 0.0)
             obj.push_back(Pair("pingtime", stats.dPingTime));
-        if (stats.dMinPing < std::numeric_limits<int64_t>::max()/1e6)
+        if (stats.dMinPing < static_cast<double>(std::numeric_limits<int64_t>::max())/1e6)
             obj.push_back(Pair("minping", stats.dMinPing));
         if (stats.dPingWait > 0.0)
             obj.push_back(Pair("pingwait", stats.dPingWait));
@@ -156,7 +156,7 @@ UniValue getpeerinfo(const JSONRPCRequest& request)
         // their ver message.
         obj.push_back(Pair("subver", stats.cleanSubVer));
         obj.push_back(Pair("inbound", stats.fInbound));
-        obj.push_back(Pair("addnode", stats.fAddnode));
+        obj.push_back(Pair("addnode", stats.m_manual_connection));
         obj.push_back(Pair("startingheight", stats.nStartingHeight));
         if (fStateStats) {
             obj.push_back(Pair("banscore", statestats.nMisbehavior));
@@ -193,7 +193,7 @@ UniValue getpeerinfo(const JSONRPCRequest& request)
 UniValue addnode(const JSONRPCRequest& request)
 {
     std::string strCommand;
-    if (request.params.size() == 2)
+    if (!request.params[1].isNull())
         strCommand = request.params[1].get_str();
     if (request.fHelp || request.params.size() != 2 ||
         (strCommand != "onetry" && strCommand != "add" && strCommand != "remove"))
@@ -201,6 +201,8 @@ UniValue addnode(const JSONRPCRequest& request)
             "addnode \"node\" \"add|remove|onetry\"\n"
             "\nAttempts to add or remove a node from the addnode list.\n"
             "Or try a connection to a node once.\n"
+            "Nodes added using addnode (or -connect) are protected from DoS disconnection and are not required to be\n"
+            "full nodes/support SegWit as other outbound peers are (though such peers will not be synced from).\n"
             "\nArguments:\n"
             "1. \"node\"     (string, required) The node (see getpeerinfo for nodes)\n"
             "2. \"command\"  (string, required) 'add' to add a node to the list, 'remove' to remove a node from the list, 'onetry' to try a connection to the node once\n"
@@ -217,7 +219,7 @@ UniValue addnode(const JSONRPCRequest& request)
     if (strCommand == "onetry")
     {
         CAddress addr;
-        g_connman->OpenNetworkConnection(addr, false, NULL, strNode.c_str());
+        g_connman->OpenNetworkConnection(addr, false, nullptr, strNode.c_str(), false, false, true);
         return NullUniValue;
     }
 
@@ -258,7 +260,7 @@ UniValue disconnectnode(const JSONRPCRequest& request)
 
     bool success;
     const UniValue &address_arg = request.params[0];
-    const UniValue &id_arg = request.params.size() < 2 ? NullUniValue : request.params[1];
+    const UniValue &id_arg = request.params[1];
 
     if (!address_arg.isNull() && id_arg.isNull()) {
         /* handle disconnect-by-address */
@@ -311,7 +313,7 @@ UniValue getaddednodeinfo(const JSONRPCRequest& request)
 
     std::vector<AddedNodeInfo> vInfo = g_connman->GetAddedNodeInfo();
 
-    if (request.params.size() == 1 && !request.params[0].isNull()) {
+    if (!request.params[0].isNull()) {
         bool found = false;
         for (const AddedNodeInfo& info : vInfo) {
             if (info.strAddedNode == request.params[0].get_str()) {
@@ -447,7 +449,7 @@ UniValue getnetworkinfo(const JSONRPCRequest& request)
             "  }\n"
             "  ,...\n"
             "  ]\n"
-            "  \"warnings\": \"...\"                    (string) any network warnings\n"
+            "  \"warnings\": \"...\"                    (string) any network and blockchain warnings\n"
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("getnetworkinfo", "")
@@ -490,7 +492,7 @@ UniValue getnetworkinfo(const JSONRPCRequest& request)
 UniValue setban(const JSONRPCRequest& request)
 {
     std::string strCommand;
-    if (request.params.size() >= 2)
+    if (!request.params[1].isNull())
         strCommand = request.params[1].get_str();
     if (request.fHelp || request.params.size() < 2 ||
         (strCommand != "add" && strCommand != "remove"))
@@ -534,11 +536,11 @@ UniValue setban(const JSONRPCRequest& request)
             throw JSONRPCError(RPC_CLIENT_NODE_ALREADY_ADDED, "Error: IP/Subnet already banned");
 
         int64_t banTime = 0; //use standard bantime if not specified
-        if (request.params.size() >= 3 && !request.params[2].isNull())
+        if (!request.params[2].isNull())
             banTime = request.params[2].get_int64();
 
         bool absolute = false;
-        if (request.params.size() == 4 && request.params[3].isTrue())
+        if (request.params[3].isTrue())
             absolute = true;
 
         isSubnet ? g_connman->Ban(subNet, BanReasonManuallyAdded, banTime, absolute) : g_connman->Ban(netAddr, BanReasonManuallyAdded, banTime, absolute);
@@ -623,20 +625,20 @@ UniValue setnetworkactive(const JSONRPCRequest& request)
 }
 
 static const CRPCCommand commands[] =
-{ //  category              name                      actor (function)         okSafeMode
+{ //  category              name                      actor (function)         argNames
   //  --------------------- ------------------------  -----------------------  ----------
-    { "network",            "getconnectioncount",     &getconnectioncount,     true,  {} },
-    { "network",            "ping",                   &ping,                   true,  {} },
-    { "network",            "getpeerinfo",            &getpeerinfo,            true,  {} },
-    { "network",            "addnode",                &addnode,                true,  {"node","command"} },
-    { "network",            "disconnectnode",         &disconnectnode,         true,  {"address", "nodeid"} },
-    { "network",            "getaddednodeinfo",       &getaddednodeinfo,       true,  {"node"} },
-    { "network",            "getnettotals",           &getnettotals,           true,  {} },
-    { "network",            "getnetworkinfo",         &getnetworkinfo,         true,  {} },
-    { "network",            "setban",                 &setban,                 true,  {"subnet", "command", "bantime", "absolute"} },
-    { "network",            "listbanned",             &listbanned,             true,  {} },
-    { "network",            "clearbanned",            &clearbanned,            true,  {} },
-    { "network",            "setnetworkactive",       &setnetworkactive,       true,  {"state"} },
+    { "network",            "getconnectioncount",     &getconnectioncount,     {} },
+    { "network",            "ping",                   &ping,                   {} },
+    { "network",            "getpeerinfo",            &getpeerinfo,            {} },
+    { "network",            "addnode",                &addnode,                {"node","command"} },
+    { "network",            "disconnectnode",         &disconnectnode,         {"address", "nodeid"} },
+    { "network",            "getaddednodeinfo",       &getaddednodeinfo,       {"node"} },
+    { "network",            "getnettotals",           &getnettotals,           {} },
+    { "network",            "getnetworkinfo",         &getnetworkinfo,         {} },
+    { "network",            "setban",                 &setban,                 {"subnet", "command", "bantime", "absolute"} },
+    { "network",            "listbanned",             &listbanned,             {} },
+    { "network",            "clearbanned",            &clearbanned,            {} },
+    { "network",            "setnetworkactive",       &setnetworkactive,       {"state"} },
 };
 
 void RegisterNetRPCCommands(CRPCTable &t)
diff --git a/src/rpc/protocol.cpp b/src/rpc/protocol.cpp
index 823a5775f..1f4ae75b1 100644
--- a/src/rpc/protocol.cpp
+++ b/src/rpc/protocol.cpp
@@ -19,7 +19,7 @@
  * JSON-RPC protocol.  Bitcoin speaks version 1.0 for maximum compatibility,
  * but uses JSON-RPC 1.1/2.0 standards for parts of the 1.0 standard that were
  * unspecified (HTTP errors and contents of 'error').
- * 
+ *
  * 1.0 spec: http://json-rpc.org/wiki/specification
  * 1.2 spec: http://jsonrpc.org/historical/json-rpc-over-http.html
  */
@@ -66,9 +66,14 @@ static const std::string COOKIEAUTH_USER = "__cookie__";
 /** Default name for auth cookie file */
 static const std::string COOKIEAUTH_FILE = ".cookie";
 
-fs::path GetAuthCookieFile()
+/** Get name of RPC authentication cookie file */
+static fs::path GetAuthCookieFile(bool temp=false)
 {
-    fs::path path(GetArg("-rpccookiefile", COOKIEAUTH_FILE));
+    std::string arg = gArgs.GetArg("-rpccookiefile", COOKIEAUTH_FILE);
+    if (temp) {
+        arg += ".tmp";
+    }
+    fs::path path(arg);
     if (!path.is_complete()) path = GetDataDir() / path;
     return path;
 }
@@ -84,14 +89,20 @@ bool GenerateAuthCookie(std::string *cookie_out)
      * these are set to 077 in init.cpp unless overridden with -sysperms.
      */
     std::ofstream file;
-    fs::path filepath = GetAuthCookieFile();
-    file.open(filepath.string().c_str());
+    fs::path filepath_tmp = GetAuthCookieFile(true);
+    file.open(filepath_tmp.string().c_str());
     if (!file.is_open()) {
-        LogPrintf("Unable to open cookie authentication file %s for writing\n", filepath.string());
+        LogPrintf("Unable to open cookie authentication file %s for writing\n", filepath_tmp.string());
         return false;
     }
     file << cookie;
     file.close();
+
+    fs::path filepath = GetAuthCookieFile(false);
+    if (!RenameOver(filepath_tmp, filepath)) {
+        LogPrintf("Unable to rename cookie authentication file %s to %s\n", filepath_tmp.string(), filepath.string());
+        return false;
+    }
     LogPrintf("Generated RPC authentication cookie %s\n", filepath.string());
 
     if (cookie_out)
@@ -124,3 +135,22 @@ void DeleteAuthCookie()
     }
 }
 
+std::vector<UniValue> JSONRPCProcessBatchReply(const UniValue &in, size_t num)
+{
+    if (!in.isArray()) {
+        throw std::runtime_error("Batch must be an array");
+    }
+    std::vector<UniValue> batch(num);
+    for (size_t i=0; i<in.size(); ++i) {
+        const UniValue &rec = in[i];
+        if (!rec.isObject()) {
+            throw std::runtime_error("Batch member must be object");
+        }
+        size_t id = rec["id"].get_int();
+        if (id >= num) {
+            throw std::runtime_error("Batch member id larger than size");
+        }
+        batch[id] = rec;
+    }
+    return batch;
+}
diff --git a/src/rpc/protocol.h b/src/rpc/protocol.h
index 4bd4702d6..cb668f3db 100644
--- a/src/rpc/protocol.h
+++ b/src/rpc/protocol.h
@@ -57,6 +57,7 @@ enum RPCErrorCode
     RPC_VERIFY_REJECTED             = -26, //!< Transaction or block was rejected by network rules
     RPC_VERIFY_ALREADY_IN_CHAIN     = -27, //!< Transaction already in chain
     RPC_IN_WARMUP                   = -28, //!< Client still warming up
+    RPC_METHOD_DEPRECATED           = -32, //!< RPC method is deprecated
 
     //! Aliases for backward compatibility
     RPC_TRANSACTION_ERROR           = RPC_VERIFY_ERROR,
@@ -91,13 +92,13 @@ UniValue JSONRPCReplyObj(const UniValue& result, const UniValue& error, const Un
 std::string JSONRPCReply(const UniValue& result, const UniValue& error, const UniValue& id);
 UniValue JSONRPCError(int code, const std::string& message);
 
-/** Get name of RPC authentication cookie file */
-fs::path GetAuthCookieFile();
 /** Generate a new RPC authentication cookie and write it to disk */
 bool GenerateAuthCookie(std::string *cookie_out);
 /** Read the RPC authentication cookie from disk */
 bool GetAuthCookie(std::string *cookie_out);
 /** Delete RPC authentication cookie from disk */
 void DeleteAuthCookie();
+/** Parse JSON-RPC batch reply into a vector */
+std::vector<UniValue> JSONRPCProcessBatchReply(const UniValue &in, size_t num);
 
 #endif // BITCOIN_RPCPROTOCOL_H
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index b967f2dbf..d860dbc24 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -16,6 +16,7 @@
 #include "policy/policy.h"
 #include "policy/rbf.h"
 #include "primitives/transaction.h"
+#include "rpc/safemode.h"
 #include "rpc/server.h"
 #include "script/script.h"
 #include "script/script_error.h"
@@ -41,7 +42,7 @@ void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue& entry)
     // Blockchain contextual information (confirmations and blocktime) is not
     // available to code in bitcoin-common, so we query them here and push the
     // data into the returned UniValue.
-    TxToUniv(tx, uint256(), entry);
+    TxToUniv(tx, uint256(), entry, true, RPCSerializationFlags());
 
     if (!hashBlock.IsNull()) {
         entry.push_back(Pair("blockhash", hashBlock.GetHex()));
@@ -160,13 +161,10 @@ UniValue getrawtransaction(const JSONRPCRequest& request)
             : "No such mempool transaction. Use -txindex to enable blockchain transaction queries") +
             ". Use gettransaction for wallet transactions.");
 
-    std::string strHex = EncodeHexTx(*tx, RPCSerializationFlags());
-
     if (!fVerbose)
-        return strHex;
+        return EncodeHexTx(*tx, RPCSerializationFlags());
 
     UniValue result(UniValue::VOBJ);
-    result.push_back(Pair("hex", strHex));
     TxToJSON(*tx, hashBlock, result);
     return result;
 }
@@ -208,7 +206,7 @@ UniValue gettxoutproof(const JSONRPCRequest& request)
 
     LOCK(cs_main);
 
-    CBlockIndex* pblockindex = NULL;
+    CBlockIndex* pblockindex = nullptr;
 
     uint256 hashBlock;
     if (!request.params[1].isNull())
@@ -228,7 +226,7 @@ UniValue gettxoutproof(const JSONRPCRequest& request)
         }
     }
 
-    if (pblockindex == NULL)
+    if (pblockindex == nullptr)
     {
         CTransactionRef tx;
         if (!GetTransaction(oneTxid, tx, Params().GetConsensus(), hashBlock, false) || hashBlock.IsNull())
@@ -339,14 +337,14 @@ UniValue createrawtransaction(const JSONRPCRequest& request)
 
     CMutableTransaction rawTx;
 
-    if (request.params.size() > 2 && !request.params[2].isNull()) {
+    if (!request.params[2].isNull()) {
         int64_t nLockTime = request.params[2].get_int64();
         if (nLockTime < 0 || nLockTime > std::numeric_limits<uint32_t>::max())
             throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, locktime out of range");
         rawTx.nLockTime = nLockTime;
     }
 
-    bool rbfOptIn = request.params.size() > 3 ? request.params[3].isTrue() : false;
+    bool rbfOptIn = request.params[3].isTrue();
 
     for (unsigned int idx = 0; idx < inputs.size(); idx++) {
         const UniValue& input = inputs[idx];
@@ -386,7 +384,7 @@ UniValue createrawtransaction(const JSONRPCRequest& request)
         rawTx.vin.push_back(in);
     }
 
-    std::set<CBitcoinAddress> setAddress;
+    std::set<CTxDestination> destinations;
     std::vector<std::string> addrList = sendTo.getKeys();
     for (const std::string& name_ : addrList) {
 
@@ -396,15 +394,16 @@ UniValue createrawtransaction(const JSONRPCRequest& request)
             CTxOut out(0, CScript() << OP_RETURN << data);
             rawTx.vout.push_back(out);
         } else {
-            CBitcoinAddress address(name_);
-            if (!address.IsValid())
-                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ")+name_);
+            CTxDestination destination = DecodeDestination(name_);
+            if (!IsValidDestination(destination)) {
+                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ") + name_);
+            }
 
-            if (setAddress.count(address))
-                throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ")+name_);
-            setAddress.insert(address);
+            if (!destinations.insert(destination).second) {
+                throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ") + name_);
+            }
 
-            CScript scriptPubKey = GetScriptForDestination(address.Get());
+            CScript scriptPubKey = GetScriptForDestination(destination);
             CAmount nAmount = AmountFromValue(sendTo[name_]);
 
             CTxOut out(nAmount, scriptPubKey);
@@ -483,7 +482,7 @@ UniValue decoderawtransaction(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed");
 
     UniValue result(UniValue::VOBJ);
-    TxToUniv(CTransaction(std::move(mtx)), uint256(), result);
+    TxToUniv(CTransaction(std::move(mtx)), uint256(), result, false);
 
     return result;
 }
@@ -531,7 +530,7 @@ UniValue decodescript(const JSONRPCRequest& request)
     if (type.isStr() && type.get_str() != "scripthash") {
         // P2SH cannot be wrapped in a P2SH. If this script is already a P2SH,
         // don't return the address for a P2SH of the P2SH.
-        r.push_back(Pair("p2sh", CBitcoinAddress(CScriptID(script)).ToString()));
+        r.push_back(Pair("p2sh", EncodeDestination(CScriptID(script))));
     }
 
     return r;
@@ -572,7 +571,7 @@ UniValue combinerawtransaction(const JSONRPCRequest& request)
             "    ]\n"
 
             "\nResult:\n"
-            "\"hex\" : \"value\",           (string) The hex-encoded raw transaction with signature(s)\n"
+            "\"hex\"            (string) The hex-encoded raw transaction with signature(s)\n"
 
             "\nExamples:\n"
             + HelpExampleCli("combinerawtransaction", "[\"myhex1\", \"myhex2\", \"myhex3\"]")
@@ -706,8 +705,9 @@ UniValue signrawtransaction(const JSONRPCRequest& request)
             + HelpExampleRpc("signrawtransaction", "\"myhex\"")
         );
 
+    ObserveSafeMode();
 #ifdef ENABLE_WALLET
-    LOCK2(cs_main, pwallet ? &pwallet->cs_wallet : NULL);
+    LOCK2(cs_main, pwallet ? &pwallet->cs_wallet : nullptr);
 #else
     LOCK(cs_main);
 #endif
@@ -735,7 +735,7 @@ UniValue signrawtransaction(const JSONRPCRequest& request)
 
     bool fGivenKeys = false;
     CBasicKeyStore tempKeystore;
-    if (request.params.size() > 2 && !request.params[2].isNull()) {
+    if (!request.params[2].isNull()) {
         fGivenKeys = true;
         UniValue keys = request.params[2].get_array();
         for (unsigned int idx = 0; idx < keys.size(); idx++) {
@@ -757,7 +757,7 @@ UniValue signrawtransaction(const JSONRPCRequest& request)
 #endif
 
     // Add previous txouts given in the RPC call:
-    if (request.params.size() > 1 && !request.params[1].isNull()) {
+    if (!request.params[1].isNull()) {
         UniValue prevTxs = request.params[1].get_array();
         for (unsigned int idx = 0; idx < prevTxs.size(); idx++) {
             const UniValue& p = prevTxs[idx];
@@ -828,7 +828,7 @@ UniValue signrawtransaction(const JSONRPCRequest& request)
 #endif
 
     int nHashType = SIGHASH_ALL;
-    if (request.params.size() > 3 && !request.params[3].isNull()) {
+    if (!request.params[3].isNull()) {
         static std::map<std::string, int> mapSigHashValues = {
             {std::string("ALL"), int(SIGHASH_ALL)},
             {std::string("ALL|ANYONECANPAY"), int(SIGHASH_ALL|SIGHASH_ANYONECANPAY)},
@@ -873,7 +873,12 @@ UniValue signrawtransaction(const JSONRPCRequest& request)
 
         ScriptError serror = SCRIPT_ERR_OK;
         if (!VerifyScript(txin.scriptSig, prevPubKey, &txin.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount), &serror)) {
-            TxInErrorToJSON(txin, vErrors, ScriptErrorString(serror));
+            if (serror == SCRIPT_ERR_INVALID_STACK_OPERATION) {
+                // Unable to sign input and verification failed (possible attempt to partially sign).
+                TxInErrorToJSON(txin, vErrors, "Unable to sign input, invalid stack size (possibly missing key)");
+            } else {
+                TxInErrorToJSON(txin, vErrors, ScriptErrorString(serror));
+            }
         }
     }
     bool fComplete = vErrors.empty();
@@ -911,6 +916,7 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
             + HelpExampleRpc("sendrawtransaction", "\"signedhex\"")
         );
 
+    ObserveSafeMode();
     LOCK(cs_main);
     RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VBOOL});
 
@@ -922,7 +928,7 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
     const uint256& hashTx = tx->GetHash();
 
     CAmount nMaxRawTxFee = maxTxFee;
-    if (request.params.size() > 1 && request.params[1].get_bool())
+    if (!request.params[1].isNull() && request.params[1].get_bool())
         nMaxRawTxFee = 0;
 
     CCoinsViewCache &view = *pcoinsTip;
@@ -936,8 +942,8 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
         // push to local node and sync with wallets
         CValidationState state;
         bool fMissingInputs;
-        bool fLimitFree = true;
-        if (!AcceptToMemoryPool(mempool, state, std::move(tx), fLimitFree, &fMissingInputs, NULL, false, nMaxRawTxFee)) {
+        if (!AcceptToMemoryPool(mempool, state, std::move(tx), &fMissingInputs,
+                                nullptr /* plTxnReplaced */, false /* bypass_limits */, nMaxRawTxFee)) {
             if (state.IsInvalid()) {
                 throw JSONRPCError(RPC_TRANSACTION_REJECTED, strprintf("%i: %s", state.GetRejectCode(), state.GetRejectReason()));
             } else {
@@ -962,18 +968,18 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
 }
 
 static const CRPCCommand commands[] =
-{ //  category              name                      actor (function)         okSafeMode
+{ //  category              name                      actor (function)         argNames
   //  --------------------- ------------------------  -----------------------  ----------
-    { "rawtransactions",    "getrawtransaction",      &getrawtransaction,      true,  {"txid","verbose"} },
-    { "rawtransactions",    "createrawtransaction",   &createrawtransaction,   true,  {"inputs","outputs","locktime","replaceable"} },
-    { "rawtransactions",    "decoderawtransaction",   &decoderawtransaction,   true,  {"hexstring"} },
-    { "rawtransactions",    "decodescript",           &decodescript,           true,  {"hexstring"} },
-    { "rawtransactions",    "sendrawtransaction",     &sendrawtransaction,     false, {"hexstring","allowhighfees"} },
-    { "rawtransactions",    "combinerawtransaction",  &combinerawtransaction,  true,  {"txs"} },
-    { "rawtransactions",    "signrawtransaction",     &signrawtransaction,     false, {"hexstring","prevtxs","privkeys","sighashtype"} }, /* uses wallet if enabled */
-
-    { "blockchain",         "gettxoutproof",          &gettxoutproof,          true,  {"txids", "blockhash"} },
-    { "blockchain",         "verifytxoutproof",       &verifytxoutproof,       true,  {"proof"} },
+    { "rawtransactions",    "getrawtransaction",      &getrawtransaction,      {"txid","verbose"} },
+    { "rawtransactions",    "createrawtransaction",   &createrawtransaction,   {"inputs","outputs","locktime","replaceable"} },
+    { "rawtransactions",    "decoderawtransaction",   &decoderawtransaction,   {"hexstring"} },
+    { "rawtransactions",    "decodescript",           &decodescript,           {"hexstring"} },
+    { "rawtransactions",    "sendrawtransaction",     &sendrawtransaction,     {"hexstring","allowhighfees"} },
+    { "rawtransactions",    "combinerawtransaction",  &combinerawtransaction,  {"txs"} },
+    { "rawtransactions",    "signrawtransaction",     &signrawtransaction,     {"hexstring","prevtxs","privkeys","sighashtype"} }, /* uses wallet if enabled */
+
+    { "blockchain",         "gettxoutproof",          &gettxoutproof,          {"txids", "blockhash"} },
+    { "blockchain",         "verifytxoutproof",       &verifytxoutproof,       {"proof"} },
 };
 
 void RegisterRawTransactionRPCCommands(CRPCTable &t)
diff --git a/src/rpc/safemode.cpp b/src/rpc/safemode.cpp
new file mode 100644
index 000000000..24770ad47
--- /dev/null
+++ b/src/rpc/safemode.cpp
@@ -0,0 +1,14 @@
+#include "safemode.h"
+
+#include "rpc/protocol.h"
+#include "util.h"
+#include "warnings.h"
+
+void ObserveSafeMode()
+{
+    std::string warning = GetWarnings("rpc");
+    if (warning != "" && !gArgs.GetBoolArg("-disablesafemode", DEFAULT_DISABLE_SAFEMODE)) {
+        throw JSONRPCError(RPC_FORBIDDEN_BY_SAFE_MODE, std::string("Safe mode: ") + warning);
+    }
+}
+
diff --git a/src/rpc/safemode.h b/src/rpc/safemode.h
new file mode 100644
index 000000000..8466d6b2f
--- /dev/null
+++ b/src/rpc/safemode.h
@@ -0,0 +1,12 @@
+// Copyright (c) 2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_RPC_SAFEMODE_H
+#define BITCOIN_RPC_SAFEMODE_H
+
+static const bool DEFAULT_DISABLE_SAFEMODE = true;
+
+void ObserveSafeMode();
+
+#endif // BITCOIN_RPC_SAFEMODE_H
diff --git a/src/rpc/server.cpp b/src/rpc/server.cpp
index 58640d69d..39bcfc690 100644
--- a/src/rpc/server.cpp
+++ b/src/rpc/server.cpp
@@ -30,7 +30,7 @@ static bool fRPCInWarmup = true;
 static std::string rpcWarmupStatus("RPC server started");
 static CCriticalSection cs_rpcWarmup;
 /* Timer-creating functions */
-static RPCTimerInterface* timerInterface = NULL;
+static RPCTimerInterface* timerInterface = nullptr;
 /* Map of name to timer. */
 static std::map<std::string, std::unique_ptr<RPCTimerBase> > deadlineTimers;
 
@@ -51,11 +51,6 @@ void RPCServer::OnStopped(std::function<void ()> slot)
     g_rpcSignals.Stopped.connect(slot);
 }
 
-void RPCServer::OnPreCommand(std::function<void (const CRPCCommand&)> slot)
-{
-    g_rpcSignals.PreCommand.connect(boost::bind(slot, _1));
-}
-
 void RPCTypeCheck(const UniValue& params,
                   const std::list<UniValue::VType>& typesExpected,
                   bool fAllowNull)
@@ -267,12 +262,12 @@ UniValue uptime(const JSONRPCRequest& jsonRequest)
  * Call Table
  */
 static const CRPCCommand vRPCCommands[] =
-{ //  category              name                      actor (function)         okSafe argNames
-  //  --------------------- ------------------------  -----------------------  ------ ----------
+{ //  category              name                      actor (function)         argNames
+  //  --------------------- ------------------------  -----------------------  ----------
     /* Overall control/query calls */
-    { "control",            "help",                   &help,                   true,  {"command"}  },
-    { "control",            "stop",                   &stop,                   true,  {}  },
-    { "control",            "uptime",                 &uptime,                 true,  {}  },
+    { "control",            "help",                   &help,                   {"command"}  },
+    { "control",            "stop",                   &stop,                   {}  },
+    { "control",            "uptime",                 &uptime,                 {}  },
 };
 
 CRPCTable::CRPCTable()
@@ -291,7 +286,7 @@ const CRPCCommand *CRPCTable::operator[](const std::string &name) const
 {
     std::map<std::string, const CRPCCommand*>::const_iterator it = mapCommands.find(name);
     if (it == mapCommands.end())
-        return NULL;
+        return nullptr;
     return (*it).second;
 }
 
@@ -387,11 +382,17 @@ void JSONRPCRequest::parse(const UniValue& valRequest)
         throw JSONRPCError(RPC_INVALID_REQUEST, "Params must be an array or object");
 }
 
-static UniValue JSONRPCExecOne(const UniValue& req)
+bool IsDeprecatedRPCEnabled(const std::string& method)
+{
+    const std::vector<std::string> enabled_methods = gArgs.GetArgs("-deprecatedrpc");
+
+    return find(enabled_methods.begin(), enabled_methods.end(), method) != enabled_methods.end();
+}
+
+static UniValue JSONRPCExecOne(JSONRPCRequest jreq, const UniValue& req)
 {
     UniValue rpc_result(UniValue::VOBJ);
 
-    JSONRPCRequest jreq;
     try {
         jreq.parse(req);
 
@@ -411,11 +412,11 @@ static UniValue JSONRPCExecOne(const UniValue& req)
     return rpc_result;
 }
 
-std::string JSONRPCExecBatch(const UniValue& vReq)
+std::string JSONRPCExecBatch(const JSONRPCRequest& jreq, const UniValue& vReq)
 {
     UniValue ret(UniValue::VARR);
     for (unsigned int reqIdx = 0; reqIdx < vReq.size(); reqIdx++)
-        ret.push_back(JSONRPCExecOne(vReq[reqIdx]));
+        ret.push_back(JSONRPCExecOne(jreq, vReq[reqIdx]));
 
     return ret.write() + "\n";
 }
@@ -537,7 +538,7 @@ void RPCSetTimerInterface(RPCTimerInterface *iface)
 void RPCUnsetTimerInterface(RPCTimerInterface *iface)
 {
     if (timerInterface == iface)
-        timerInterface = NULL;
+        timerInterface = nullptr;
 }
 
 void RPCRunLater(const std::string& name, std::function<void(void)> func, int64_t nSeconds)
@@ -552,7 +553,7 @@ void RPCRunLater(const std::string& name, std::function<void(void)> func, int64_
 int RPCSerializationFlags()
 {
     int flag = 0;
-    if (GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) == 0)
+    if (gArgs.GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) == 0)
         flag |= SERIALIZE_TRANSACTION_NO_WITNESS;
     return flag;
 }
diff --git a/src/rpc/server.h b/src/rpc/server.h
index dd6f76324..74c4a9e80 100644
--- a/src/rpc/server.h
+++ b/src/rpc/server.h
@@ -25,13 +25,12 @@ namespace RPCServer
 {
     void OnStarted(std::function<void ()> slot);
     void OnStopped(std::function<void ()> slot);
-    void OnPreCommand(std::function<void (const CRPCCommand&)> slot);
 }
 
 /** Wrapper for UniValue::VType, which includes typeAny:
  * Used to denote don't care type. Only used by RPCTypeCheckObj */
 struct UniValueType {
-    UniValueType(UniValue::VType _type) : typeAny(false), type(_type) {}
+    explicit UniValueType(UniValue::VType _type) : typeAny(false), type(_type) {}
     UniValueType() : typeAny(true) {}
     bool typeAny;
     UniValue::VType type;
@@ -134,7 +133,6 @@ class CRPCCommand
     std::string category;
     std::string name;
     rpcfn_type actor;
-    bool okSafeMode;
     std::vector<std::string> argNames;
 };
 
@@ -173,6 +171,8 @@ class CRPCTable
     bool appendCommand(const std::string& name, const CRPCCommand* pcmd);
 };
 
+bool IsDeprecatedRPCEnabled(const std::string& method);
+
 extern CRPCTable tableRPC;
 
 /**
@@ -191,7 +191,7 @@ extern std::string HelpExampleRpc(const std::string& methodname, const std::stri
 bool StartRPC();
 void InterruptRPC();
 void StopRPC();
-std::string JSONRPCExecBatch(const UniValue& vReq);
+std::string JSONRPCExecBatch(const JSONRPCRequest& jreq, const UniValue& vReq);
 
 // Retrieves any serialization flags requested in command line argument
 int RPCSerializationFlags();
diff --git a/src/scheduler.cpp b/src/scheduler.cpp
index 1d3fb1f6e..4edb2c6d9 100644
--- a/src/scheduler.cpp
+++ b/src/scheduler.cpp
@@ -174,7 +174,7 @@ void SingleThreadedSchedulerClient::ProcessQueue() {
     // to ensure both happen safely even if callback() throws.
     struct RAIICallbacksRunning {
         SingleThreadedSchedulerClient* instance;
-        RAIICallbacksRunning(SingleThreadedSchedulerClient* _instance) : instance(_instance) {}
+        explicit RAIICallbacksRunning(SingleThreadedSchedulerClient* _instance) : instance(_instance) {}
         ~RAIICallbacksRunning() {
             {
                 LOCK(instance->m_cs_callbacks_pending);
diff --git a/src/scheduler.h b/src/scheduler.h
index 0365d668b..db93bcb21 100644
--- a/src/scheduler.h
+++ b/src/scheduler.h
@@ -81,7 +81,7 @@ class CScheduler
     int nThreadsServicingQueue;
     bool stopRequested;
     bool stopWhenEmpty;
-    bool shouldStop() { return stopRequested || (stopWhenEmpty && taskQueue.empty()); }
+    bool shouldStop() const { return stopRequested || (stopWhenEmpty && taskQueue.empty()); }
 };
 
 /**
@@ -102,7 +102,7 @@ class SingleThreadedSchedulerClient {
     void ProcessQueue();
 
 public:
-    SingleThreadedSchedulerClient(CScheduler *pschedulerIn) : m_pscheduler(pschedulerIn) {}
+    explicit SingleThreadedSchedulerClient(CScheduler *pschedulerIn) : m_pscheduler(pschedulerIn) {}
     void AddToProcessQueue(std::function<void (void)> func);
 
     // Processes all remaining queue members on the calling thread, blocking until queue is empty
diff --git a/src/script/bitcoinconsensus.cpp b/src/script/bitcoinconsensus.cpp
index 4b71a42cd..03128917f 100644
--- a/src/script/bitcoinconsensus.cpp
+++ b/src/script/bitcoinconsensus.cpp
@@ -28,10 +28,10 @@ class TxInputStream
         if (nSize > m_remaining)
             throw std::ios_base::failure(std::string(__func__) + ": end of data");
 
-        if (pch == NULL)
+        if (pch == nullptr)
             throw std::ios_base::failure(std::string(__func__) + ": bad destination buffer");
 
-        if (m_data == NULL)
+        if (m_data == nullptr)
             throw std::ios_base::failure(std::string(__func__) + ": bad source buffer");
 
         memcpy(pch, m_data, nSize);
@@ -95,7 +95,7 @@ static int verify_script(const unsigned char *scriptPubKey, unsigned int scriptP
         set_error(err, bitcoinconsensus_ERR_OK);
 
         PrecomputedTransactionData txdata(tx);
-        return VerifyScript(tx.vin[nIn].scriptSig, CScript(scriptPubKey, scriptPubKey + scriptPubKeyLen), &tx.vin[nIn].scriptWitness, flags, TransactionSignatureChecker(&tx, nIn, amount, txdata), NULL);
+        return VerifyScript(tx.vin[nIn].scriptSig, CScript(scriptPubKey, scriptPubKey + scriptPubKeyLen), &tx.vin[nIn].scriptWitness, flags, TransactionSignatureChecker(&tx, nIn, amount, txdata), nullptr);
     } catch (const std::exception&) {
         return set_error(err, bitcoinconsensus_ERR_TX_DESERIALIZE); // Error deserializing
     }
diff --git a/src/script/bitcoinconsensus.h b/src/script/bitcoinconsensus.h
index 1bef4fe9e..33bf80e5a 100644
--- a/src/script/bitcoinconsensus.h
+++ b/src/script/bitcoinconsensus.h
@@ -63,7 +63,7 @@ enum
 /// Returns 1 if the input nIn of the serialized transaction pointed to by
 /// txTo correctly spends the scriptPubKey pointed to by scriptPubKey under
 /// the additional constraints specified by flags.
-/// If not NULL, err will contain an error/success code for the operation
+/// If not nullptr, err will contain an error/success code for the operation
 EXPORT_SYMBOL int bitcoinconsensus_verify_script(const unsigned char *scriptPubKey, unsigned int scriptPubKeyLen,
                                                  const unsigned char *txTo        , unsigned int txToLen,
                                                  unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err);
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index 8a121774a..2f7b8e3a0 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -1168,29 +1168,36 @@ uint256 GetOutputsHash(const CTransaction& txTo) {
 
 PrecomputedTransactionData::PrecomputedTransactionData(const CTransaction& txTo)
 {
-    hashPrevouts = GetPrevoutHash(txTo);
-    hashSequence = GetSequenceHash(txTo);
-    hashOutputs = GetOutputsHash(txTo);
+    // Cache is calculated only for transactions with witness
+    if (txTo.HasWitness()) {
+        hashPrevouts = GetPrevoutHash(txTo);
+        hashSequence = GetSequenceHash(txTo);
+        hashOutputs = GetOutputsHash(txTo);
+        ready = true;
+    }
 }
 
 uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache)
 {
+    assert(nIn < txTo.vin.size());
+
     if (sigversion == SIGVERSION_WITNESS_V0) {
         uint256 hashPrevouts;
         uint256 hashSequence;
         uint256 hashOutputs;
+        const bool cacheready = cache && cache->ready;
 
         if (!(nHashType & SIGHASH_ANYONECANPAY)) {
-            hashPrevouts = cache ? cache->hashPrevouts : GetPrevoutHash(txTo);
+            hashPrevouts = cacheready ? cache->hashPrevouts : GetPrevoutHash(txTo);
         }
 
         if (!(nHashType & SIGHASH_ANYONECANPAY) && (nHashType & 0x1f) != SIGHASH_SINGLE && (nHashType & 0x1f) != SIGHASH_NONE) {
-            hashSequence = cache ? cache->hashSequence : GetSequenceHash(txTo);
+            hashSequence = cacheready ? cache->hashSequence : GetSequenceHash(txTo);
         }
 
 
         if ((nHashType & 0x1f) != SIGHASH_SINGLE && (nHashType & 0x1f) != SIGHASH_NONE) {
-            hashOutputs = cache ? cache->hashOutputs : GetOutputsHash(txTo);
+            hashOutputs = cacheready ? cache->hashOutputs : GetOutputsHash(txTo);
         } else if ((nHashType & 0x1f) == SIGHASH_SINGLE && nIn < txTo.vout.size()) {
             CHashWriter ss(SER_GETHASH, 0);
             ss << txTo.vout[nIn];
@@ -1221,10 +1228,6 @@ uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsig
     }
 
     static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
-    if (nIn >= txTo.vin.size()) {
-        //  nIn out of range
-        return one;
-    }
 
     // Check for invalid use of SIGHASH_SINGLE
     if ((nHashType & 0x1f) == SIGHASH_SINGLE) {
@@ -1366,7 +1369,7 @@ static bool VerifyWitnessProgram(const CScriptWitness& witness, int witversion,
             stack = std::vector<std::vector<unsigned char> >(witness.stack.begin(), witness.stack.end() - 1);
             uint256 hashScriptPubKey;
             CSHA256().Write(&scriptPubKey[0], scriptPubKey.size()).Finalize(hashScriptPubKey.begin());
-            if (memcmp(hashScriptPubKey.begin(), &program[0], 32)) {
+            if (memcmp(hashScriptPubKey.begin(), program.data(), 32)) {
                 return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_MISMATCH);
             }
         } else if (program.size() == 20) {
@@ -1407,7 +1410,7 @@ static bool VerifyWitnessProgram(const CScriptWitness& witness, int witversion,
 bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror)
 {
     static const CScriptWitness emptyWitness;
-    if (witness == NULL) {
+    if (witness == nullptr) {
         witness = &emptyWitness;
     }
     bool hadWitness = false;
diff --git a/src/script/interpreter.h b/src/script/interpreter.h
index ab1dc4e68..1cb9cc789 100644
--- a/src/script/interpreter.h
+++ b/src/script/interpreter.h
@@ -113,8 +113,9 @@ bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned i
 struct PrecomputedTransactionData
 {
     uint256 hashPrevouts, hashSequence, hashOutputs;
+    bool ready = false;
 
-    PrecomputedTransactionData(const CTransaction& tx);
+    explicit PrecomputedTransactionData(const CTransaction& tx);
 };
 
 enum SigVersion
@@ -123,7 +124,7 @@ enum SigVersion
     SIGVERSION_WITNESS_V0 = 1,
 };
 
-uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = NULL);
+uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = nullptr);
 
 class BaseSignatureChecker
 {
@@ -158,7 +159,7 @@ class TransactionSignatureChecker : public BaseSignatureChecker
     virtual bool VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const;
 
 public:
-    TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(NULL) {}
+    TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(nullptr) {}
     TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn, const PrecomputedTransactionData& txdataIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(&txdataIn) {}
     bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const override;
     bool CheckLockTime(const CScriptNum& nLockTime) const override;
@@ -174,8 +175,8 @@ class MutableTransactionSignatureChecker : public TransactionSignatureChecker
     MutableTransactionSignatureChecker(const CMutableTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : TransactionSignatureChecker(&txTo, nInIn, amountIn), txTo(*txToIn) {}
 };
 
-bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* error = NULL);
-bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror = NULL);
+bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* error = nullptr);
+bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror = nullptr);
 
 size_t CountWitnessSigOps(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags);
 
diff --git a/src/script/ismine.cpp b/src/script/ismine.cpp
index 0a3961973..6b68f0679 100644
--- a/src/script/ismine.cpp
+++ b/src/script/ismine.cpp
@@ -46,6 +46,8 @@ isminetype IsMine(const CKeyStore &keystore, const CTxDestination& dest, bool& i
 
 isminetype IsMine(const CKeyStore &keystore, const CScript& scriptPubKey, bool& isInvalid, SigVersion sigversion)
 {
+    isInvalid = false;
+
     std::vector<valtype> vSolutions;
     txnouttype whichType;
     if (!Solver(scriptPubKey, whichType, vSolutions)) {
@@ -59,6 +61,7 @@ isminetype IsMine(const CKeyStore &keystore, const CScript& scriptPubKey, bool&
     {
     case TX_NONSTANDARD:
     case TX_NULL_DATA:
+    case TX_WITNESS_UNKNOWN:
         break;
     case TX_PUBKEY:
         keyID = CPubKey(vSolutions[0]).GetID();
diff --git a/src/script/script.h b/src/script/script.h
index d16bfd0e0..2a9206054 100644
--- a/src/script/script.h
+++ b/src/script/script.h
@@ -377,6 +377,12 @@ class CScriptNum
     int64_t m_value;
 };
 
+/**
+ * We use a prevector for the script to reduce the considerable memory overhead
+ *  of vectors in cases where they normally contain a small number of small elements.
+ * Tests in October 2015 showed use of this reduced dbcache memory usage by 23%
+ *  and made an initial sync 13% faster.
+ */
 typedef prevector<28, unsigned char> CScriptBase;
 
 /** Serialized script, used inside transaction inputs and outputs */
@@ -414,6 +420,7 @@ class CScript : public CScriptBase
 
     CScript& operator+=(const CScript& b)
     {
+        reserve(size() + b.size());
         insert(end(), b.begin(), b.end());
         return *this;
     }
@@ -498,7 +505,7 @@ class CScript : public CScriptBase
     bool GetOp(iterator& pc, opcodetype& opcodeRet)
     {
          const_iterator pc2 = pc;
-         bool fRet = GetOp2(pc2, opcodeRet, NULL);
+         bool fRet = GetOp2(pc2, opcodeRet, nullptr);
          pc = begin() + (pc2 - begin());
          return fRet;
     }
@@ -510,7 +517,7 @@ class CScript : public CScriptBase
 
     bool GetOp(const_iterator& pc, opcodetype& opcodeRet) const
     {
-        return GetOp2(pc, opcodeRet, NULL);
+        return GetOp2(pc, opcodeRet, nullptr);
     }
 
     bool GetOp2(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet) const
diff --git a/src/script/script_error.cpp b/src/script/script_error.cpp
index c9d13c92a..6c590f53e 100644
--- a/src/script/script_error.cpp
+++ b/src/script/script_error.cpp
@@ -73,6 +73,8 @@ const char* ScriptErrorString(const ScriptError serror)
             return "Witness version reserved for soft-fork upgrades";
         case SCRIPT_ERR_PUBKEYTYPE:
             return "Public key is neither compressed or uncompressed";
+        case SCRIPT_ERR_CLEANSTACK:
+            return "Extra items left on stack after execution";
         case SCRIPT_ERR_WITNESS_PROGRAM_WRONG_LENGTH:
             return "Witness program has incorrect length";
         case SCRIPT_ERR_WITNESS_PROGRAM_WITNESS_EMPTY:
diff --git a/src/script/sigcache.cpp b/src/script/sigcache.cpp
index ceb573b2e..4cc7afa2f 100644
--- a/src/script/sigcache.cpp
+++ b/src/script/sigcache.cpp
@@ -74,7 +74,7 @@ void InitSignatureCache()
 {
     // nMaxCacheSize is unsigned. If -maxsigcachesize is set to zero,
     // setup_bytes creates the minimum possible cache (2 elements).
-    size_t nMaxCacheSize = std::min(std::max((int64_t)0, GetArg("-maxsigcachesize", DEFAULT_MAX_SIG_CACHE_SIZE) / 2), MAX_MAX_SIG_CACHE_SIZE) * ((size_t) 1 << 20);
+    size_t nMaxCacheSize = std::min(std::max((int64_t)0, gArgs.GetArg("-maxsigcachesize", DEFAULT_MAX_SIG_CACHE_SIZE) / 2), MAX_MAX_SIG_CACHE_SIZE) * ((size_t) 1 << 20);
     size_t nElems = signatureCache.setup_bytes(nMaxCacheSize);
     LogPrintf("Using %zu MiB out of %zu/2 requested for signature cache, able to store %zu elements\n",
             (nElems*sizeof(uint256)) >>20, (nMaxCacheSize*2)>>20, nElems);
diff --git a/src/script/sign.cpp b/src/script/sign.cpp
index dc50467d3..ac58b690a 100644
--- a/src/script/sign.cpp
+++ b/src/script/sign.cpp
@@ -79,6 +79,7 @@ static bool SignStep(const BaseSignatureCreator& creator, const CScript& scriptP
     {
     case TX_NONSTANDARD:
     case TX_NULL_DATA:
+    case TX_WITNESS_UNKNOWN:
         return false;
     case TX_PUBKEY:
         keyID = CPubKey(vSolutions[0]).GetID();
@@ -309,6 +310,7 @@ static Stacks CombineSignatures(const CScript& scriptPubKey, const BaseSignature
     {
     case TX_NONSTANDARD:
     case TX_NULL_DATA:
+    case TX_WITNESS_UNKNOWN:
         // Don't know anything about this, assume bigger one is correct:
         if (sigs1.script.size() >= sigs2.script.size())
             return sigs1;
diff --git a/src/script/sign.h b/src/script/sign.h
index bd4586289..a0d8ee4ff 100644
--- a/src/script/sign.h
+++ b/src/script/sign.h
@@ -21,7 +21,7 @@ class BaseSignatureCreator {
     const CKeyStore* keystore;
 
 public:
-    BaseSignatureCreator(const CKeyStore* keystoreIn) : keystore(keystoreIn) {}
+    explicit BaseSignatureCreator(const CKeyStore* keystoreIn) : keystore(keystoreIn) {}
     const CKeyStore& KeyStore() const { return *keystore; };
     virtual ~BaseSignatureCreator() {}
     virtual const BaseSignatureChecker& Checker() const =0;
@@ -54,7 +54,7 @@ class MutableTransactionSignatureCreator : public TransactionSignatureCreator {
 /** A signature creator that just produces 72-byte empty signatures. */
 class DummySignatureCreator : public BaseSignatureCreator {
 public:
-    DummySignatureCreator(const CKeyStore* keystoreIn) : BaseSignatureCreator(keystoreIn) {}
+    explicit DummySignatureCreator(const CKeyStore* keystoreIn) : BaseSignatureCreator(keystoreIn) {}
     const BaseSignatureChecker& Checker() const override;
     bool CreateSig(std::vector<unsigned char>& vchSig, const CKeyID& keyid, const CScript& scriptCode, SigVersion sigversion) const override;
 };
diff --git a/src/script/standard.cpp b/src/script/standard.cpp
index 760a5305e..f57f1f61b 100644
--- a/src/script/standard.cpp
+++ b/src/script/standard.cpp
@@ -30,13 +30,11 @@ const char* GetTxnOutputType(txnouttype t)
     case TX_NULL_DATA: return "nulldata";
     case TX_WITNESS_V0_KEYHASH: return "witness_v0_keyhash";
     case TX_WITNESS_V0_SCRIPTHASH: return "witness_v0_scripthash";
+    case TX_WITNESS_UNKNOWN: return "witness_unknown";
     }
-    return NULL;
+    return nullptr;
 }
 
-/**
- * Return public keys or hashes from scriptPubKey, for 'standard' transaction types.
- */
 bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet)
 {
     // Templates
@@ -78,6 +76,12 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::v
             vSolutionsRet.push_back(witnessprogram);
             return true;
         }
+        if (witnessversion != 0) {
+            typeRet = TX_WITNESS_UNKNOWN;
+            vSolutionsRet.push_back(std::vector<unsigned char>{(unsigned char)witnessversion});
+            vSolutionsRet.push_back(std::move(witnessprogram));
+            return true;
+        }
         return false;
     }
 
@@ -201,6 +205,23 @@ bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet)
     {
         addressRet = CScriptID(uint160(vSolutions[0]));
         return true;
+    } else if (whichType == TX_WITNESS_V0_KEYHASH) {
+        WitnessV0KeyHash hash;
+        std::copy(vSolutions[0].begin(), vSolutions[0].end(), hash.begin());
+        addressRet = hash;
+        return true;
+    } else if (whichType == TX_WITNESS_V0_SCRIPTHASH) {
+        WitnessV0ScriptHash hash;
+        std::copy(vSolutions[0].begin(), vSolutions[0].end(), hash.begin());
+        addressRet = hash;
+        return true;
+    } else if (whichType == TX_WITNESS_UNKNOWN) {
+        WitnessUnknown unk;
+        unk.version = vSolutions[0][0];
+        std::copy(vSolutions[1].begin(), vSolutions[1].end(), unk.program);
+        unk.length = vSolutions[1].size();
+        addressRet = unk;
+        return true;
     }
     // Multisig txns have more than one address...
     return false;
@@ -253,7 +274,7 @@ class CScriptVisitor : public boost::static_visitor<bool>
 private:
     CScript *script;
 public:
-    CScriptVisitor(CScript *scriptin) { script = scriptin; }
+    explicit CScriptVisitor(CScript *scriptin) { script = scriptin; }
 
     bool operator()(const CNoDestination &dest) const {
         script->clear();
@@ -271,6 +292,27 @@ class CScriptVisitor : public boost::static_visitor<bool>
         *script << OP_HASH160 << ToByteVector(scriptID) << OP_EQUAL;
         return true;
     }
+
+    bool operator()(const WitnessV0KeyHash& id) const
+    {
+        script->clear();
+        *script << OP_0 << ToByteVector(id);
+        return true;
+    }
+
+    bool operator()(const WitnessV0ScriptHash& id) const
+    {
+        script->clear();
+        *script << OP_0 << ToByteVector(id);
+        return true;
+    }
+
+    bool operator()(const WitnessUnknown& id) const
+    {
+        script->clear();
+        *script << CScript::EncodeOP_N(id.version) << std::vector<unsigned char>(id.program, id.program + id.length);
+        return true;
+    }
 };
 } // namespace
 
@@ -320,3 +362,7 @@ CScript GetScriptForWitness(const CScript& redeemscript)
     ret << OP_0 << ToByteVector(hash);
     return ret;
 }
+
+bool IsValidDestination(const CTxDestination& dest) {
+    return dest.which() != 0;
+}
diff --git a/src/script/standard.h b/src/script/standard.h
index 841c1a059..f75ad5770 100644
--- a/src/script/standard.h
+++ b/src/script/standard.h
@@ -29,6 +29,8 @@ class CScriptID : public uint160
 
 static const unsigned int MAX_OP_RETURN_RELAY = 9990; //!< bytes (+1 for OP_RETURN, +2 for the pushdata opcodes)
 extern bool fAcceptDatacarrier;
+
+/** Maximum size of TX_NULL_DATA scripts that this node considers standard. */
 extern unsigned nMaxDatacarrierBytes;
 
 /**
@@ -36,7 +38,7 @@ extern unsigned nMaxDatacarrierBytes;
  * them to be valid. (but old blocks may not comply with) Currently just P2SH,
  * but in the future other flags may be added, such as a soft-fork to enforce
  * strict DER encoding.
- * 
+ *
  * Failing one of these tests may trigger a DoS ban - see CheckInputs() for
  * details.
  */
@@ -50,9 +52,10 @@ enum txnouttype
     TX_PUBKEYHASH,
     TX_SCRIPTHASH,
     TX_MULTISIG,
-    TX_NULL_DATA,
+    TX_NULL_DATA, //!< unspendable OP_RETURN script that carries data
     TX_WITNESS_V0_SCRIPTHASH,
     TX_WITNESS_V0_KEYHASH,
+    TX_WITNESS_UNKNOWN, //!< Only for Witness versions not already defined above
 };
 
 class CNoDestination {
@@ -61,24 +64,98 @@ class CNoDestination {
     friend bool operator<(const CNoDestination &a, const CNoDestination &b) { return true; }
 };
 
-/** 
+struct WitnessV0ScriptHash : public uint256 {};
+struct WitnessV0KeyHash : public uint160 {};
+
+//! CTxDestination subtype to encode any future Witness version
+struct WitnessUnknown
+{
+    unsigned int version;
+    unsigned int length;
+    unsigned char program[40];
+
+    friend bool operator==(const WitnessUnknown& w1, const WitnessUnknown& w2) {
+        if (w1.version != w2.version) return false;
+        if (w1.length != w2.length) return false;
+        return std::equal(w1.program, w1.program + w1.length, w2.program);
+    }
+
+    friend bool operator<(const WitnessUnknown& w1, const WitnessUnknown& w2) {
+        if (w1.version < w2.version) return true;
+        if (w1.version > w2.version) return false;
+        if (w1.length < w2.length) return true;
+        if (w1.length > w2.length) return false;
+        return std::lexicographical_compare(w1.program, w1.program + w1.length, w2.program, w2.program + w2.length);
+    }
+};
+
+/**
  * A txout script template with a specific destination. It is either:
  *  * CNoDestination: no destination set
- *  * CKeyID: TX_PUBKEYHASH destination
- *  * CScriptID: TX_SCRIPTHASH destination
- *  A CTxDestination is the internal data type encoded in a CBitcoinAddress
+ *  * CKeyID: TX_PUBKEYHASH destination (P2PKH)
+ *  * CScriptID: TX_SCRIPTHASH destination (P2SH)
+ *  * WitnessV0ScriptHash: TX_WITNESS_V0_SCRIPTHASH destination (P2WSH)
+ *  * WitnessV0KeyHash: TX_WITNESS_V0_KEYHASH destination (P2WPKH)
+ *  * WitnessUnknown: TX_WITNESS_UNKNOWN destination (P2W???)
+ *  A CTxDestination is the internal data type encoded in a bitcoin address
  */
-typedef boost::variant<CNoDestination, CKeyID, CScriptID> CTxDestination;
+typedef boost::variant<CNoDestination, CKeyID, CScriptID, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessUnknown> CTxDestination;
 
+/** Check whether a CTxDestination is a CNoDestination. */
+bool IsValidDestination(const CTxDestination& dest);
+
+/** Get the name of a txnouttype as a C string, or nullptr if unknown. */
 const char* GetTxnOutputType(txnouttype t);
 
+/**
+ * Parse a scriptPubKey and identify script type for standard scripts. If
+ * successful, returns script type and parsed pubkeys or hashes, depending on
+ * the type. For example, for a P2SH script, vSolutionsRet will contain the
+ * script hash, for P2PKH it will contain the key hash, etc.
+ *
+ * @param[in]   scriptPubKey   Script to parse
+ * @param[out]  typeRet        The script type
+ * @param[out]  vSolutionsRet  Vector of parsed pubkeys and hashes
+ * @return                     True if script matches standard template
+ */
 bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
+
+/**
+ * Parse a standard scriptPubKey for the destination address. Assigns result to
+ * the addressRet parameter and returns true if successful. For multisig
+ * scripts, instead use ExtractDestinations. Currently only works for P2PK,
+ * P2PKH, P2SH, P2WPKH, and P2WSH scripts.
+ */
 bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
+
+/**
+ * Parse a standard scriptPubKey with one or more destination addresses. For
+ * multisig scripts, this populates the addressRet vector with the pubkey IDs
+ * and nRequiredRet with the n required to spend. For other destinations,
+ * addressRet is populated with a single value and nRequiredRet is set to 1.
+ * Returns true if successful. Currently does not extract address from
+ * pay-to-witness scripts.
+ */
 bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
 
+/**
+ * Generate a Bitcoin scriptPubKey for the given CTxDestination. Returns a P2PKH
+ * script for a CKeyID destination, a P2SH script for a CScriptID, and an empty
+ * script for CNoDestination.
+ */
 CScript GetScriptForDestination(const CTxDestination& dest);
+
+/** Generate a P2PK script for the given pubkey. */
 CScript GetScriptForRawPubKey(const CPubKey& pubkey);
+
+/** Generate a multisig script. */
 CScript GetScriptForMultisig(int nRequired, const std::vector<CPubKey>& keys);
+
+/**
+ * Generate a pay-to-witness script for the given redeem script. If the redeem
+ * script is P2PK or P2PKH, this returns a P2WPKH script, otherwise it returns a
+ * P2WSH script.
+ */
 CScript GetScriptForWitness(const CScript& redeemscript);
 
 #endif // BITCOIN_SCRIPT_STANDARD_H
diff --git a/src/secp256k1/contrib/lax_der_parsing.h b/src/secp256k1/contrib/lax_der_parsing.h
index 6d27871a7..7eaf63bf6 100644
--- a/src/secp256k1/contrib/lax_der_parsing.h
+++ b/src/secp256k1/contrib/lax_der_parsing.h
@@ -48,14 +48,14 @@
  *   8.3.1.
  */
 
-#ifndef _SECP256K1_CONTRIB_LAX_DER_PARSING_H_
-#define _SECP256K1_CONTRIB_LAX_DER_PARSING_H_
+#ifndef SECP256K1_CONTRIB_LAX_DER_PARSING_H
+#define SECP256K1_CONTRIB_LAX_DER_PARSING_H
 
 #include <secp256k1.h>
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 extern "C" {
-# endif
+#endif
 
 /** Parse a signature in "lax DER" format
  *
@@ -88,4 +88,4 @@ int ecdsa_signature_parse_der_lax(
 }
 #endif
 
-#endif
+#endif /* SECP256K1_CONTRIB_LAX_DER_PARSING_H */
diff --git a/src/secp256k1/contrib/lax_der_privatekey_parsing.h b/src/secp256k1/contrib/lax_der_privatekey_parsing.h
index 2fd088f8a..fece261fb 100644
--- a/src/secp256k1/contrib/lax_der_privatekey_parsing.h
+++ b/src/secp256k1/contrib/lax_der_privatekey_parsing.h
@@ -25,14 +25,14 @@
  * library are sufficient.
  */
 
-#ifndef _SECP256K1_CONTRIB_BER_PRIVATEKEY_H_
-#define _SECP256K1_CONTRIB_BER_PRIVATEKEY_H_
+#ifndef SECP256K1_CONTRIB_BER_PRIVATEKEY_H
+#define SECP256K1_CONTRIB_BER_PRIVATEKEY_H
 
 #include <secp256k1.h>
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 extern "C" {
-# endif
+#endif
 
 /** Export a private key in DER format.
  *
@@ -87,4 +87,4 @@ SECP256K1_WARN_UNUSED_RESULT int ec_privkey_import_der(
 }
 #endif
 
-#endif
+#endif /* SECP256K1_CONTRIB_BER_PRIVATEKEY_H */
diff --git a/src/secp256k1/include/secp256k1.h b/src/secp256k1/include/secp256k1.h
index fc4c5cefb..3e9c098d1 100644
--- a/src/secp256k1/include/secp256k1.h
+++ b/src/secp256k1/include/secp256k1.h
@@ -1,9 +1,9 @@
-#ifndef _SECP256K1_
-# define _SECP256K1_
+#ifndef SECP256K1_H
+#define SECP256K1_H
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 extern "C" {
-# endif
+#endif
 
 #include <stddef.h>
 
@@ -61,7 +61,7 @@ typedef struct {
  *  however guaranteed to be 64 bytes in size, and can be safely copied/moved.
  *  If you need to convert to a format suitable for storage, transmission, or
  *  comparison, use the secp256k1_ecdsa_signature_serialize_* and
- *  secp256k1_ecdsa_signature_serialize_* functions.
+ *  secp256k1_ecdsa_signature_parse_* functions.
  */
 typedef struct {
     unsigned char data[64];
@@ -159,6 +159,13 @@ typedef int (*secp256k1_nonce_function)(
 #define SECP256K1_EC_COMPRESSED (SECP256K1_FLAGS_TYPE_COMPRESSION | SECP256K1_FLAGS_BIT_COMPRESSION)
 #define SECP256K1_EC_UNCOMPRESSED (SECP256K1_FLAGS_TYPE_COMPRESSION)
 
+/** Prefix byte used to tag various encoded curvepoints for specific purposes */
+#define SECP256K1_TAG_PUBKEY_EVEN 0x02
+#define SECP256K1_TAG_PUBKEY_ODD 0x03
+#define SECP256K1_TAG_PUBKEY_UNCOMPRESSED 0x04
+#define SECP256K1_TAG_PUBKEY_HYBRID_EVEN 0x06
+#define SECP256K1_TAG_PUBKEY_HYBRID_ODD 0x07
+
 /** Create a secp256k1 context object.
  *
  *  Returns: a newly created context object.
@@ -607,8 +614,8 @@ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_combine(
     size_t n
 ) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 }
-# endif
-
 #endif
+
+#endif /* SECP256K1_H */
diff --git a/src/secp256k1/include/secp256k1_ecdh.h b/src/secp256k1/include/secp256k1_ecdh.h
index 4b84d7a96..88492dc1a 100644
--- a/src/secp256k1/include/secp256k1_ecdh.h
+++ b/src/secp256k1/include/secp256k1_ecdh.h
@@ -1,11 +1,11 @@
-#ifndef _SECP256K1_ECDH_
-# define _SECP256K1_ECDH_
+#ifndef SECP256K1_ECDH_H
+#define SECP256K1_ECDH_H
 
-# include "secp256k1.h"
+#include "secp256k1.h"
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 extern "C" {
-# endif
+#endif
 
 /** Compute an EC Diffie-Hellman secret in constant time
  *  Returns: 1: exponentiation was successful
@@ -24,8 +24,8 @@ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdh(
   const unsigned char *privkey
 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 }
-# endif
-
 #endif
+
+#endif /* SECP256K1_ECDH_H */
diff --git a/src/secp256k1/include/secp256k1_recovery.h b/src/secp256k1/include/secp256k1_recovery.h
index 055379725..cf6c5ed7f 100644
--- a/src/secp256k1/include/secp256k1_recovery.h
+++ b/src/secp256k1/include/secp256k1_recovery.h
@@ -1,11 +1,11 @@
-#ifndef _SECP256K1_RECOVERY_
-# define _SECP256K1_RECOVERY_
+#ifndef SECP256K1_RECOVERY_H
+#define SECP256K1_RECOVERY_H
 
-# include "secp256k1.h"
+#include "secp256k1.h"
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 extern "C" {
-# endif
+#endif
 
 /** Opaque data structured that holds a parsed ECDSA signature,
  *  supporting pubkey recovery.
@@ -103,8 +103,8 @@ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdsa_recover(
     const unsigned char *msg32
 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 }
-# endif
-
 #endif
+
+#endif /* SECP256K1_RECOVERY_H */
diff --git a/src/secp256k1/sage/group_prover.sage b/src/secp256k1/sage/group_prover.sage
index 5198724be..8521f0799 100644
--- a/src/secp256k1/sage/group_prover.sage
+++ b/src/secp256k1/sage/group_prover.sage
@@ -17,7 +17,7 @@
 #   - A constraint describing the requirements of the law, called "require"
 # * Implementations are transliterated into functions that operate as well on
 #   algebraic input points, and are called once per combination of branches
-#   exectured. Each execution returns:
+#   executed. Each execution returns:
 #   - A constraint describing the assumptions this implementation requires
 #     (such as Z1=1), called "assumeFormula"
 #   - A constraint describing the assumptions this specific branch requires,
diff --git a/src/secp256k1/src/asm/field_10x26_arm.s b/src/secp256k1/src/asm/field_10x26_arm.s
index bd2b629e1..5a9cc3ffc 100644
--- a/src/secp256k1/src/asm/field_10x26_arm.s
+++ b/src/secp256k1/src/asm/field_10x26_arm.s
@@ -23,7 +23,7 @@ Note:
 	.eabi_attribute 10, 0 @ Tag_FP_arch = none
 	.eabi_attribute 24, 1 @ Tag_ABI_align_needed = 8-byte
 	.eabi_attribute 25, 1 @ Tag_ABI_align_preserved = 8-byte, except leaf SP
-	.eabi_attribute 30, 2 @ Tag_ABI_optimization_goals = Agressive Speed
+	.eabi_attribute 30, 2 @ Tag_ABI_optimization_goals = Aggressive Speed
 	.eabi_attribute 34, 1 @ Tag_CPU_unaligned_access = v6
 	.text
 
diff --git a/src/secp256k1/src/basic-config.h b/src/secp256k1/src/basic-config.h
index c4c16eb7c..fc588061c 100644
--- a/src/secp256k1/src/basic-config.h
+++ b/src/secp256k1/src/basic-config.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_BASIC_CONFIG_
-#define _SECP256K1_BASIC_CONFIG_
+#ifndef SECP256K1_BASIC_CONFIG_H
+#define SECP256K1_BASIC_CONFIG_H
 
 #ifdef USE_BASIC_CONFIG
 
@@ -28,5 +28,6 @@
 #define USE_FIELD_10X26 1
 #define USE_SCALAR_8X32 1
 
-#endif // USE_BASIC_CONFIG
-#endif // _SECP256K1_BASIC_CONFIG_
+#endif /* USE_BASIC_CONFIG */
+
+#endif /* SECP256K1_BASIC_CONFIG_H */
diff --git a/src/secp256k1/src/bench.h b/src/secp256k1/src/bench.h
index d67f08a42..d5ebe0130 100644
--- a/src/secp256k1/src/bench.h
+++ b/src/secp256k1/src/bench.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_BENCH_H_
-#define _SECP256K1_BENCH_H_
+#ifndef SECP256K1_BENCH_H
+#define SECP256K1_BENCH_H
 
 #include <stdio.h>
 #include <math.h>
@@ -63,4 +63,4 @@ void run_benchmark(char *name, void (*benchmark)(void*), void (*setup)(void*), v
     printf("us\n");
 }
 
-#endif
+#endif /* SECP256K1_BENCH_H */
diff --git a/src/secp256k1/src/ecdsa.h b/src/secp256k1/src/ecdsa.h
index 54ae101b9..80590c7cc 100644
--- a/src/secp256k1/src/ecdsa.h
+++ b/src/secp256k1/src/ecdsa.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECDSA_
-#define _SECP256K1_ECDSA_
+#ifndef SECP256K1_ECDSA_H
+#define SECP256K1_ECDSA_H
 
 #include <stddef.h>
 
@@ -18,4 +18,4 @@ static int secp256k1_ecdsa_sig_serialize(unsigned char *sig, size_t *size, const
 static int secp256k1_ecdsa_sig_verify(const secp256k1_ecmult_context *ctx, const secp256k1_scalar* r, const secp256k1_scalar* s, const secp256k1_ge *pubkey, const secp256k1_scalar *message);
 static int secp256k1_ecdsa_sig_sign(const secp256k1_ecmult_gen_context *ctx, secp256k1_scalar* r, secp256k1_scalar* s, const secp256k1_scalar *seckey, const secp256k1_scalar *message, const secp256k1_scalar *nonce, int *recid);
 
-#endif
+#endif /* SECP256K1_ECDSA_H */
diff --git a/src/secp256k1/src/ecdsa_impl.h b/src/secp256k1/src/ecdsa_impl.h
index 453bb1188..c3400042d 100644
--- a/src/secp256k1/src/ecdsa_impl.h
+++ b/src/secp256k1/src/ecdsa_impl.h
@@ -5,8 +5,8 @@
  **********************************************************************/
 
 
-#ifndef _SECP256K1_ECDSA_IMPL_H_
-#define _SECP256K1_ECDSA_IMPL_H_
+#ifndef SECP256K1_ECDSA_IMPL_H
+#define SECP256K1_ECDSA_IMPL_H
 
 #include "scalar.h"
 #include "field.h"
@@ -81,8 +81,6 @@ static int secp256k1_der_read_len(const unsigned char **sigp, const unsigned cha
         return -1;
     }
     while (lenleft > 0) {
-        if ((ret >> ((sizeof(size_t) - 1) * 8)) != 0) {
-        }
         ret = (ret << 8) | **sigp;
         if (ret + lenleft > (size_t)(sigend - *sigp)) {
             /* Result exceeds the length of the passed array. */
@@ -312,4 +310,4 @@ static int secp256k1_ecdsa_sig_sign(const secp256k1_ecmult_gen_context *ctx, sec
     return 1;
 }
 
-#endif
+#endif /* SECP256K1_ECDSA_IMPL_H */
diff --git a/src/secp256k1/src/eckey.h b/src/secp256k1/src/eckey.h
index 42739a3be..b621f1e6c 100644
--- a/src/secp256k1/src/eckey.h
+++ b/src/secp256k1/src/eckey.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECKEY_
-#define _SECP256K1_ECKEY_
+#ifndef SECP256K1_ECKEY_H
+#define SECP256K1_ECKEY_H
 
 #include <stddef.h>
 
@@ -22,4 +22,4 @@ static int secp256k1_eckey_pubkey_tweak_add(const secp256k1_ecmult_context *ctx,
 static int secp256k1_eckey_privkey_tweak_mul(secp256k1_scalar *key, const secp256k1_scalar *tweak);
 static int secp256k1_eckey_pubkey_tweak_mul(const secp256k1_ecmult_context *ctx, secp256k1_ge *key, const secp256k1_scalar *tweak);
 
-#endif
+#endif /* SECP256K1_ECKEY_H */
diff --git a/src/secp256k1/src/eckey_impl.h b/src/secp256k1/src/eckey_impl.h
index ce38071ac..1ab9a68ec 100644
--- a/src/secp256k1/src/eckey_impl.h
+++ b/src/secp256k1/src/eckey_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECKEY_IMPL_H_
-#define _SECP256K1_ECKEY_IMPL_H_
+#ifndef SECP256K1_ECKEY_IMPL_H
+#define SECP256K1_ECKEY_IMPL_H
 
 #include "eckey.h"
 
@@ -15,16 +15,17 @@
 #include "ecmult_gen.h"
 
 static int secp256k1_eckey_pubkey_parse(secp256k1_ge *elem, const unsigned char *pub, size_t size) {
-    if (size == 33 && (pub[0] == 0x02 || pub[0] == 0x03)) {
+    if (size == 33 && (pub[0] == SECP256K1_TAG_PUBKEY_EVEN || pub[0] == SECP256K1_TAG_PUBKEY_ODD)) {
         secp256k1_fe x;
-        return secp256k1_fe_set_b32(&x, pub+1) && secp256k1_ge_set_xo_var(elem, &x, pub[0] == 0x03);
+        return secp256k1_fe_set_b32(&x, pub+1) && secp256k1_ge_set_xo_var(elem, &x, pub[0] == SECP256K1_TAG_PUBKEY_ODD);
     } else if (size == 65 && (pub[0] == 0x04 || pub[0] == 0x06 || pub[0] == 0x07)) {
         secp256k1_fe x, y;
         if (!secp256k1_fe_set_b32(&x, pub+1) || !secp256k1_fe_set_b32(&y, pub+33)) {
             return 0;
         }
         secp256k1_ge_set_xy(elem, &x, &y);
-        if ((pub[0] == 0x06 || pub[0] == 0x07) && secp256k1_fe_is_odd(&y) != (pub[0] == 0x07)) {
+        if ((pub[0] == SECP256K1_TAG_PUBKEY_HYBRID_EVEN || pub[0] == SECP256K1_TAG_PUBKEY_HYBRID_ODD) &&
+            secp256k1_fe_is_odd(&y) != (pub[0] == SECP256K1_TAG_PUBKEY_HYBRID_ODD)) {
             return 0;
         }
         return secp256k1_ge_is_valid_var(elem);
@@ -42,10 +43,10 @@ static int secp256k1_eckey_pubkey_serialize(secp256k1_ge *elem, unsigned char *p
     secp256k1_fe_get_b32(&pub[1], &elem->x);
     if (compressed) {
         *size = 33;
-        pub[0] = 0x02 | (secp256k1_fe_is_odd(&elem->y) ? 0x01 : 0x00);
+        pub[0] = secp256k1_fe_is_odd(&elem->y) ? SECP256K1_TAG_PUBKEY_ODD : SECP256K1_TAG_PUBKEY_EVEN;
     } else {
         *size = 65;
-        pub[0] = 0x04;
+        pub[0] = SECP256K1_TAG_PUBKEY_UNCOMPRESSED;
         secp256k1_fe_get_b32(&pub[33], &elem->y);
     }
     return 1;
@@ -96,4 +97,4 @@ static int secp256k1_eckey_pubkey_tweak_mul(const secp256k1_ecmult_context *ctx,
     return 1;
 }
 
-#endif
+#endif /* SECP256K1_ECKEY_IMPL_H */
diff --git a/src/secp256k1/src/ecmult.h b/src/secp256k1/src/ecmult.h
index 20484134f..6d44aba60 100644
--- a/src/secp256k1/src/ecmult.h
+++ b/src/secp256k1/src/ecmult.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_
-#define _SECP256K1_ECMULT_
+#ifndef SECP256K1_ECMULT_H
+#define SECP256K1_ECMULT_H
 
 #include "num.h"
 #include "group.h"
@@ -28,4 +28,4 @@ static int secp256k1_ecmult_context_is_built(const secp256k1_ecmult_context *ctx
 /** Double multiply: R = na*A + ng*G */
 static void secp256k1_ecmult(const secp256k1_ecmult_context *ctx, secp256k1_gej *r, const secp256k1_gej *a, const secp256k1_scalar *na, const secp256k1_scalar *ng);
 
-#endif
+#endif /* SECP256K1_ECMULT_H */
diff --git a/src/secp256k1/src/ecmult_const.h b/src/secp256k1/src/ecmult_const.h
index 2b0097655..72bf7d758 100644
--- a/src/secp256k1/src/ecmult_const.h
+++ b/src/secp256k1/src/ecmult_const.h
@@ -4,12 +4,12 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_CONST_
-#define _SECP256K1_ECMULT_CONST_
+#ifndef SECP256K1_ECMULT_CONST_H
+#define SECP256K1_ECMULT_CONST_H
 
 #include "scalar.h"
 #include "group.h"
 
 static void secp256k1_ecmult_const(secp256k1_gej *r, const secp256k1_ge *a, const secp256k1_scalar *q);
 
-#endif
+#endif /* SECP256K1_ECMULT_CONST_H */
diff --git a/src/secp256k1/src/ecmult_const_impl.h b/src/secp256k1/src/ecmult_const_impl.h
index 0db314c48..7d7a172b7 100644
--- a/src/secp256k1/src/ecmult_const_impl.h
+++ b/src/secp256k1/src/ecmult_const_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_CONST_IMPL_
-#define _SECP256K1_ECMULT_CONST_IMPL_
+#ifndef SECP256K1_ECMULT_CONST_IMPL_H
+#define SECP256K1_ECMULT_CONST_IMPL_H
 
 #include "scalar.h"
 #include "group.h"
@@ -42,11 +42,12 @@
 } while(0)
 
 
-/** Convert a number to WNAF notation. The number becomes represented by sum(2^{wi} * wnaf[i], i=0..return_val)
- *  with the following guarantees:
+/** Convert a number to WNAF notation.
+ *  The number becomes represented by sum(2^{wi} * wnaf[i], i=0..WNAF_SIZE(w)+1) - return_val.
+ *  It has the following guarantees:
  *  - each wnaf[i] an odd integer between -(1 << w) and (1 << w)
  *  - each wnaf[i] is nonzero
- *  - the number of words set is returned; this is always (WNAF_BITS + w - 1) / w
+ *  - the number of words set is always WNAF_SIZE(w) + 1
  *
  *  Adapted from `The Width-w NAF Method Provides Small Memory and Fast Elliptic Scalar
  *  Multiplications Secure against Side Channel Attacks`, Okeya and Tagaki. M. Joye (Ed.)
@@ -236,4 +237,4 @@ static void secp256k1_ecmult_const(secp256k1_gej *r, const secp256k1_ge *a, cons
     }
 }
 
-#endif
+#endif /* SECP256K1_ECMULT_CONST_IMPL_H */
diff --git a/src/secp256k1/src/ecmult_gen.h b/src/secp256k1/src/ecmult_gen.h
index eb2cc9ead..7564b7015 100644
--- a/src/secp256k1/src/ecmult_gen.h
+++ b/src/secp256k1/src/ecmult_gen.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_GEN_
-#define _SECP256K1_ECMULT_GEN_
+#ifndef SECP256K1_ECMULT_GEN_H
+#define SECP256K1_ECMULT_GEN_H
 
 #include "scalar.h"
 #include "group.h"
@@ -40,4 +40,4 @@ static void secp256k1_ecmult_gen(const secp256k1_ecmult_gen_context* ctx, secp25
 
 static void secp256k1_ecmult_gen_blind(secp256k1_ecmult_gen_context *ctx, const unsigned char *seed32);
 
-#endif
+#endif /* SECP256K1_ECMULT_GEN_H */
diff --git a/src/secp256k1/src/ecmult_gen_impl.h b/src/secp256k1/src/ecmult_gen_impl.h
index 35f254607..9615b932d 100644
--- a/src/secp256k1/src/ecmult_gen_impl.h
+++ b/src/secp256k1/src/ecmult_gen_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_GEN_IMPL_H_
-#define _SECP256K1_ECMULT_GEN_IMPL_H_
+#ifndef SECP256K1_ECMULT_GEN_IMPL_H
+#define SECP256K1_ECMULT_GEN_IMPL_H
 
 #include "scalar.h"
 #include "group.h"
@@ -207,4 +207,4 @@ static void secp256k1_ecmult_gen_blind(secp256k1_ecmult_gen_context *ctx, const
     secp256k1_gej_clear(&gb);
 }
 
-#endif
+#endif /* SECP256K1_ECMULT_GEN_IMPL_H */
diff --git a/src/secp256k1/src/ecmult_impl.h b/src/secp256k1/src/ecmult_impl.h
index 4e40104ad..93d3794cb 100644
--- a/src/secp256k1/src/ecmult_impl.h
+++ b/src/secp256k1/src/ecmult_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_IMPL_H_
-#define _SECP256K1_ECMULT_IMPL_H_
+#ifndef SECP256K1_ECMULT_IMPL_H
+#define SECP256K1_ECMULT_IMPL_H
 
 #include <string.h>
 
@@ -403,4 +403,4 @@ static void secp256k1_ecmult(const secp256k1_ecmult_context *ctx, secp256k1_gej
     }
 }
 
-#endif
+#endif /* SECP256K1_ECMULT_IMPL_H */
diff --git a/src/secp256k1/src/field.h b/src/secp256k1/src/field.h
index bbb1ee866..bb6692ad5 100644
--- a/src/secp256k1/src/field.h
+++ b/src/secp256k1/src/field.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_
-#define _SECP256K1_FIELD_
+#ifndef SECP256K1_FIELD_H
+#define SECP256K1_FIELD_H
 
 /** Field element module.
  *
@@ -129,4 +129,4 @@ static void secp256k1_fe_storage_cmov(secp256k1_fe_storage *r, const secp256k1_f
 /** If flag is true, set *r equal to *a; otherwise leave it. Constant-time. */
 static void secp256k1_fe_cmov(secp256k1_fe *r, const secp256k1_fe *a, int flag);
 
-#endif
+#endif /* SECP256K1_FIELD_H */
diff --git a/src/secp256k1/src/field_10x26.h b/src/secp256k1/src/field_10x26.h
index 61ee1e096..727c5267f 100644
--- a/src/secp256k1/src/field_10x26.h
+++ b/src/secp256k1/src/field_10x26.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_REPR_
-#define _SECP256K1_FIELD_REPR_
+#ifndef SECP256K1_FIELD_REPR_H
+#define SECP256K1_FIELD_REPR_H
 
 #include <stdint.h>
 
@@ -44,4 +44,5 @@ typedef struct {
 
 #define SECP256K1_FE_STORAGE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{ (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}
 #define SECP256K1_FE_STORAGE_CONST_GET(d) d.n[7], d.n[6], d.n[5], d.n[4],d.n[3], d.n[2], d.n[1], d.n[0]
-#endif
+
+#endif /* SECP256K1_FIELD_REPR_H */
diff --git a/src/secp256k1/src/field_10x26_impl.h b/src/secp256k1/src/field_10x26_impl.h
index 234c13a64..94f8132fc 100644
--- a/src/secp256k1/src/field_10x26_impl.h
+++ b/src/secp256k1/src/field_10x26_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_REPR_IMPL_H_
-#define _SECP256K1_FIELD_REPR_IMPL_H_
+#ifndef SECP256K1_FIELD_REPR_IMPL_H
+#define SECP256K1_FIELD_REPR_IMPL_H
 
 #include "util.h"
 #include "num.h"
@@ -1158,4 +1158,4 @@ static SECP256K1_INLINE void secp256k1_fe_from_storage(secp256k1_fe *r, const se
 #endif
 }
 
-#endif
+#endif /* SECP256K1_FIELD_REPR_IMPL_H */
diff --git a/src/secp256k1/src/field_5x52.h b/src/secp256k1/src/field_5x52.h
index 8e69a560d..bccd8feb4 100644
--- a/src/secp256k1/src/field_5x52.h
+++ b/src/secp256k1/src/field_5x52.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_REPR_
-#define _SECP256K1_FIELD_REPR_
+#ifndef SECP256K1_FIELD_REPR_H
+#define SECP256K1_FIELD_REPR_H
 
 #include <stdint.h>
 
@@ -44,4 +44,4 @@ typedef struct {
     (d6) | (((uint64_t)(d7)) << 32) \
 }}
 
-#endif
+#endif /* SECP256K1_FIELD_REPR_H */
diff --git a/src/secp256k1/src/field_5x52_asm_impl.h b/src/secp256k1/src/field_5x52_asm_impl.h
index 98cc004bf..1fc3171f6 100644
--- a/src/secp256k1/src/field_5x52_asm_impl.h
+++ b/src/secp256k1/src/field_5x52_asm_impl.h
@@ -11,8 +11,8 @@
  * - December 2014, Pieter Wuille: converted from YASM to GCC inline assembly
  */
 
-#ifndef _SECP256K1_FIELD_INNER5X52_IMPL_H_
-#define _SECP256K1_FIELD_INNER5X52_IMPL_H_
+#ifndef SECP256K1_FIELD_INNER5X52_IMPL_H
+#define SECP256K1_FIELD_INNER5X52_IMPL_H
 
 SECP256K1_INLINE static void secp256k1_fe_mul_inner(uint64_t *r, const uint64_t *a, const uint64_t * SECP256K1_RESTRICT b) {
 /**
@@ -499,4 +499,4 @@ __asm__ __volatile__(
 );
 }
 
-#endif
+#endif /* SECP256K1_FIELD_INNER5X52_IMPL_H */
diff --git a/src/secp256k1/src/field_5x52_impl.h b/src/secp256k1/src/field_5x52_impl.h
index 8e8b286ba..957c61b01 100644
--- a/src/secp256k1/src/field_5x52_impl.h
+++ b/src/secp256k1/src/field_5x52_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_REPR_IMPL_H_
-#define _SECP256K1_FIELD_REPR_IMPL_H_
+#ifndef SECP256K1_FIELD_REPR_IMPL_H
+#define SECP256K1_FIELD_REPR_IMPL_H
 
 #if defined HAVE_CONFIG_H
 #include "libsecp256k1-config.h"
@@ -493,4 +493,4 @@ static SECP256K1_INLINE void secp256k1_fe_from_storage(secp256k1_fe *r, const se
 #endif
 }
 
-#endif
+#endif /* SECP256K1_FIELD_REPR_IMPL_H */
diff --git a/src/secp256k1/src/field_5x52_int128_impl.h b/src/secp256k1/src/field_5x52_int128_impl.h
index 0bf22bdd3..95a0d1791 100644
--- a/src/secp256k1/src/field_5x52_int128_impl.h
+++ b/src/secp256k1/src/field_5x52_int128_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_INNER5X52_IMPL_H_
-#define _SECP256K1_FIELD_INNER5X52_IMPL_H_
+#ifndef SECP256K1_FIELD_INNER5X52_IMPL_H
+#define SECP256K1_FIELD_INNER5X52_IMPL_H
 
 #include <stdint.h>
 
@@ -274,4 +274,4 @@ SECP256K1_INLINE static void secp256k1_fe_sqr_inner(uint64_t *r, const uint64_t
     /* [r4 r3 r2 r1 r0] = [p8 p7 p6 p5 p4 p3 p2 p1 p0] */
 }
 
-#endif
+#endif /* SECP256K1_FIELD_INNER5X52_IMPL_H */
diff --git a/src/secp256k1/src/field_impl.h b/src/secp256k1/src/field_impl.h
index 5127b279b..20428648a 100644
--- a/src/secp256k1/src/field_impl.h
+++ b/src/secp256k1/src/field_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_IMPL_H_
-#define _SECP256K1_FIELD_IMPL_H_
+#ifndef SECP256K1_FIELD_IMPL_H
+#define SECP256K1_FIELD_IMPL_H
 
 #if defined HAVE_CONFIG_H
 #include "libsecp256k1-config.h"
@@ -312,4 +312,4 @@ static int secp256k1_fe_is_quad_var(const secp256k1_fe *a) {
 #endif
 }
 
-#endif
+#endif /* SECP256K1_FIELD_IMPL_H */
diff --git a/src/secp256k1/src/group.h b/src/secp256k1/src/group.h
index 4957b248f..ea1302deb 100644
--- a/src/secp256k1/src/group.h
+++ b/src/secp256k1/src/group.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_GROUP_
-#define _SECP256K1_GROUP_
+#ifndef SECP256K1_GROUP_H
+#define SECP256K1_GROUP_H
 
 #include "num.h"
 #include "field.h"
@@ -141,4 +141,4 @@ static void secp256k1_ge_storage_cmov(secp256k1_ge_storage *r, const secp256k1_g
 /** Rescale a jacobian point by b which must be non-zero. Constant-time. */
 static void secp256k1_gej_rescale(secp256k1_gej *r, const secp256k1_fe *b);
 
-#endif
+#endif /* SECP256K1_GROUP_H */
diff --git a/src/secp256k1/src/group_impl.h b/src/secp256k1/src/group_impl.h
index 7d723532f..b31b6c12e 100644
--- a/src/secp256k1/src/group_impl.h
+++ b/src/secp256k1/src/group_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_GROUP_IMPL_H_
-#define _SECP256K1_GROUP_IMPL_H_
+#ifndef SECP256K1_GROUP_IMPL_H
+#define SECP256K1_GROUP_IMPL_H
 
 #include "num.h"
 #include "field.h"
@@ -697,4 +697,4 @@ static int secp256k1_gej_has_quad_y_var(const secp256k1_gej *a) {
     return secp256k1_fe_is_quad_var(&yz);
 }
 
-#endif
+#endif /* SECP256K1_GROUP_IMPL_H */
diff --git a/src/secp256k1/src/hash.h b/src/secp256k1/src/hash.h
index fca98cab9..e08d25d22 100644
--- a/src/secp256k1/src/hash.h
+++ b/src/secp256k1/src/hash.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_HASH_
-#define _SECP256K1_HASH_
+#ifndef SECP256K1_HASH_H
+#define SECP256K1_HASH_H
 
 #include <stdlib.h>
 #include <stdint.h>
@@ -38,4 +38,4 @@ static void secp256k1_rfc6979_hmac_sha256_initialize(secp256k1_rfc6979_hmac_sha2
 static void secp256k1_rfc6979_hmac_sha256_generate(secp256k1_rfc6979_hmac_sha256_t *rng, unsigned char *out, size_t outlen);
 static void secp256k1_rfc6979_hmac_sha256_finalize(secp256k1_rfc6979_hmac_sha256_t *rng);
 
-#endif
+#endif /* SECP256K1_HASH_H */
diff --git a/src/secp256k1/src/hash_impl.h b/src/secp256k1/src/hash_impl.h
index b47e65f83..4c9964ee0 100644
--- a/src/secp256k1/src/hash_impl.h
+++ b/src/secp256k1/src/hash_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_HASH_IMPL_H_
-#define _SECP256K1_HASH_IMPL_H_
+#ifndef SECP256K1_HASH_IMPL_H
+#define SECP256K1_HASH_IMPL_H
 
 #include "hash.h"
 
@@ -278,4 +278,4 @@ static void secp256k1_rfc6979_hmac_sha256_finalize(secp256k1_rfc6979_hmac_sha256
 #undef Maj
 #undef Ch
 
-#endif
+#endif /* SECP256K1_HASH_IMPL_H */
diff --git a/src/secp256k1/src/modules/ecdh/main_impl.h b/src/secp256k1/src/modules/ecdh/main_impl.h
index 9e30fb73d..01ecba4d5 100644
--- a/src/secp256k1/src/modules/ecdh/main_impl.h
+++ b/src/secp256k1/src/modules/ecdh/main_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_MODULE_ECDH_MAIN_
-#define _SECP256K1_MODULE_ECDH_MAIN_
+#ifndef SECP256K1_MODULE_ECDH_MAIN_H
+#define SECP256K1_MODULE_ECDH_MAIN_H
 
 #include "include/secp256k1_ecdh.h"
 #include "ecmult_const_impl.h"
@@ -51,4 +51,4 @@ int secp256k1_ecdh(const secp256k1_context* ctx, unsigned char *result, const se
     return ret;
 }
 
-#endif
+#endif /* SECP256K1_MODULE_ECDH_MAIN_H */
diff --git a/src/secp256k1/src/modules/ecdh/tests_impl.h b/src/secp256k1/src/modules/ecdh/tests_impl.h
index 85a5d0a9a..cec30b67c 100644
--- a/src/secp256k1/src/modules/ecdh/tests_impl.h
+++ b/src/secp256k1/src/modules/ecdh/tests_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_MODULE_ECDH_TESTS_
-#define _SECP256K1_MODULE_ECDH_TESTS_
+#ifndef SECP256K1_MODULE_ECDH_TESTS_H
+#define SECP256K1_MODULE_ECDH_TESTS_H
 
 void test_ecdh_api(void) {
     /* Setup context that just counts errors */
@@ -102,4 +102,4 @@ void run_ecdh_tests(void) {
     test_bad_scalar();
 }
 
-#endif
+#endif /* SECP256K1_MODULE_ECDH_TESTS_H */
diff --git a/src/secp256k1/src/modules/recovery/main_impl.h b/src/secp256k1/src/modules/recovery/main_impl.h
index c6fbe2398..2f6691c5a 100755
--- a/src/secp256k1/src/modules/recovery/main_impl.h
+++ b/src/secp256k1/src/modules/recovery/main_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_MODULE_RECOVERY_MAIN_
-#define _SECP256K1_MODULE_RECOVERY_MAIN_
+#ifndef SECP256K1_MODULE_RECOVERY_MAIN_H
+#define SECP256K1_MODULE_RECOVERY_MAIN_H
 
 #include "include/secp256k1_recovery.h"
 
@@ -190,4 +190,4 @@ int secp256k1_ecdsa_recover(const secp256k1_context* ctx, secp256k1_pubkey *pubk
     }
 }
 
-#endif
+#endif /* SECP256K1_MODULE_RECOVERY_MAIN_H */
diff --git a/src/secp256k1/src/modules/recovery/tests_impl.h b/src/secp256k1/src/modules/recovery/tests_impl.h
index 765c7dd81..5c9bbe861 100644
--- a/src/secp256k1/src/modules/recovery/tests_impl.h
+++ b/src/secp256k1/src/modules/recovery/tests_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_MODULE_RECOVERY_TESTS_
-#define _SECP256K1_MODULE_RECOVERY_TESTS_
+#ifndef SECP256K1_MODULE_RECOVERY_TESTS_H
+#define SECP256K1_MODULE_RECOVERY_TESTS_H
 
 static int recovery_test_nonce_function(unsigned char *nonce32, const unsigned char *msg32, const unsigned char *key32, const unsigned char *algo16, void *data, unsigned int counter) {
     (void) msg32;
@@ -390,4 +390,4 @@ void run_recovery_tests(void) {
     test_ecdsa_recovery_edge_cases();
 }
 
-#endif
+#endif /* SECP256K1_MODULE_RECOVERY_TESTS_H */
diff --git a/src/secp256k1/src/num.h b/src/secp256k1/src/num.h
index 7bb9c5be8..49f2dd791 100644
--- a/src/secp256k1/src/num.h
+++ b/src/secp256k1/src/num.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_NUM_
-#define _SECP256K1_NUM_
+#ifndef SECP256K1_NUM_H
+#define SECP256K1_NUM_H
 
 #ifndef USE_NUM_NONE
 
@@ -71,4 +71,4 @@ static void secp256k1_num_negate(secp256k1_num *r);
 
 #endif
 
-#endif
+#endif /* SECP256K1_NUM_H */
diff --git a/src/secp256k1/src/num_gmp.h b/src/secp256k1/src/num_gmp.h
index 7dd813088..3619844bd 100644
--- a/src/secp256k1/src/num_gmp.h
+++ b/src/secp256k1/src/num_gmp.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_NUM_REPR_
-#define _SECP256K1_NUM_REPR_
+#ifndef SECP256K1_NUM_REPR_H
+#define SECP256K1_NUM_REPR_H
 
 #include <gmp.h>
 
@@ -17,4 +17,4 @@ typedef struct {
     int limbs;
 } secp256k1_num;
 
-#endif
+#endif /* SECP256K1_NUM_REPR_H */
diff --git a/src/secp256k1/src/num_gmp_impl.h b/src/secp256k1/src/num_gmp_impl.h
index 3a46495ee..0ae2a8ba0 100644
--- a/src/secp256k1/src/num_gmp_impl.h
+++ b/src/secp256k1/src/num_gmp_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_NUM_REPR_IMPL_H_
-#define _SECP256K1_NUM_REPR_IMPL_H_
+#ifndef SECP256K1_NUM_REPR_IMPL_H
+#define SECP256K1_NUM_REPR_IMPL_H
 
 #include <string.h>
 #include <stdlib.h>
@@ -285,4 +285,4 @@ static void secp256k1_num_negate(secp256k1_num *r) {
     r->neg ^= 1;
 }
 
-#endif
+#endif /* SECP256K1_NUM_REPR_IMPL_H */
diff --git a/src/secp256k1/src/num_impl.h b/src/secp256k1/src/num_impl.h
index 0b0e3a072..c45193b03 100644
--- a/src/secp256k1/src/num_impl.h
+++ b/src/secp256k1/src/num_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_NUM_IMPL_H_
-#define _SECP256K1_NUM_IMPL_H_
+#ifndef SECP256K1_NUM_IMPL_H
+#define SECP256K1_NUM_IMPL_H
 
 #if defined HAVE_CONFIG_H
 #include "libsecp256k1-config.h"
@@ -21,4 +21,4 @@
 #error "Please select num implementation"
 #endif
 
-#endif
+#endif /* SECP256K1_NUM_IMPL_H */
diff --git a/src/secp256k1/src/scalar.h b/src/secp256k1/src/scalar.h
index 27e9d8375..59304cb66 100644
--- a/src/secp256k1/src/scalar.h
+++ b/src/secp256k1/src/scalar.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_
-#define _SECP256K1_SCALAR_
+#ifndef SECP256K1_SCALAR_H
+#define SECP256K1_SCALAR_H
 
 #include "num.h"
 
@@ -103,4 +103,4 @@ static void secp256k1_scalar_split_lambda(secp256k1_scalar *r1, secp256k1_scalar
 /** Multiply a and b (without taking the modulus!), divide by 2**shift, and round to the nearest integer. Shift must be at least 256. */
 static void secp256k1_scalar_mul_shift_var(secp256k1_scalar *r, const secp256k1_scalar *a, const secp256k1_scalar *b, unsigned int shift);
 
-#endif
+#endif /* SECP256K1_SCALAR_H */
diff --git a/src/secp256k1/src/scalar_4x64.h b/src/secp256k1/src/scalar_4x64.h
index cff406038..19c7495d1 100644
--- a/src/secp256k1/src/scalar_4x64.h
+++ b/src/secp256k1/src/scalar_4x64.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_
-#define _SECP256K1_SCALAR_REPR_
+#ifndef SECP256K1_SCALAR_REPR_H
+#define SECP256K1_SCALAR_REPR_H
 
 #include <stdint.h>
 
@@ -16,4 +16,4 @@ typedef struct {
 
 #define SECP256K1_SCALAR_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{((uint64_t)(d1)) << 32 | (d0), ((uint64_t)(d3)) << 32 | (d2), ((uint64_t)(d5)) << 32 | (d4), ((uint64_t)(d7)) << 32 | (d6)}}
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_H */
diff --git a/src/secp256k1/src/scalar_4x64_impl.h b/src/secp256k1/src/scalar_4x64_impl.h
index 56e7bd82a..db1ebf94b 100644
--- a/src/secp256k1/src/scalar_4x64_impl.h
+++ b/src/secp256k1/src/scalar_4x64_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_IMPL_H_
-#define _SECP256K1_SCALAR_REPR_IMPL_H_
+#ifndef SECP256K1_SCALAR_REPR_IMPL_H
+#define SECP256K1_SCALAR_REPR_IMPL_H
 
 /* Limbs of the secp256k1 order. */
 #define SECP256K1_N_0 ((uint64_t)0xBFD25E8CD0364141ULL)
@@ -946,4 +946,4 @@ SECP256K1_INLINE static void secp256k1_scalar_mul_shift_var(secp256k1_scalar *r,
     secp256k1_scalar_cadd_bit(r, 0, (l[(shift - 1) >> 6] >> ((shift - 1) & 0x3f)) & 1);
 }
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_IMPL_H */
diff --git a/src/secp256k1/src/scalar_8x32.h b/src/secp256k1/src/scalar_8x32.h
index 1319664f6..2c9a348e2 100644
--- a/src/secp256k1/src/scalar_8x32.h
+++ b/src/secp256k1/src/scalar_8x32.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_
-#define _SECP256K1_SCALAR_REPR_
+#ifndef SECP256K1_SCALAR_REPR_H
+#define SECP256K1_SCALAR_REPR_H
 
 #include <stdint.h>
 
@@ -16,4 +16,4 @@ typedef struct {
 
 #define SECP256K1_SCALAR_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7)}}
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_H */
diff --git a/src/secp256k1/src/scalar_8x32_impl.h b/src/secp256k1/src/scalar_8x32_impl.h
index aae4f35c0..4f9ed61fe 100644
--- a/src/secp256k1/src/scalar_8x32_impl.h
+++ b/src/secp256k1/src/scalar_8x32_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_IMPL_H_
-#define _SECP256K1_SCALAR_REPR_IMPL_H_
+#ifndef SECP256K1_SCALAR_REPR_IMPL_H
+#define SECP256K1_SCALAR_REPR_IMPL_H
 
 /* Limbs of the secp256k1 order. */
 #define SECP256K1_N_0 ((uint32_t)0xD0364141UL)
@@ -718,4 +718,4 @@ SECP256K1_INLINE static void secp256k1_scalar_mul_shift_var(secp256k1_scalar *r,
     secp256k1_scalar_cadd_bit(r, 0, (l[(shift - 1) >> 5] >> ((shift - 1) & 0x1f)) & 1);
 }
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_IMPL_H */
diff --git a/src/secp256k1/src/scalar_impl.h b/src/secp256k1/src/scalar_impl.h
index 2690d8655..fa790570f 100644
--- a/src/secp256k1/src/scalar_impl.h
+++ b/src/secp256k1/src/scalar_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_IMPL_H_
-#define _SECP256K1_SCALAR_IMPL_H_
+#ifndef SECP256K1_SCALAR_IMPL_H
+#define SECP256K1_SCALAR_IMPL_H
 
 #include "group.h"
 #include "scalar.h"
@@ -330,4 +330,4 @@ static void secp256k1_scalar_split_lambda(secp256k1_scalar *r1, secp256k1_scalar
 #endif
 #endif
 
-#endif
+#endif /* SECP256K1_SCALAR_IMPL_H */
diff --git a/src/secp256k1/src/scalar_low.h b/src/secp256k1/src/scalar_low.h
index 5574c44c7..5836febc5 100644
--- a/src/secp256k1/src/scalar_low.h
+++ b/src/secp256k1/src/scalar_low.h
@@ -4,12 +4,12 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_
-#define _SECP256K1_SCALAR_REPR_
+#ifndef SECP256K1_SCALAR_REPR_H
+#define SECP256K1_SCALAR_REPR_H
 
 #include <stdint.h>
 
 /** A scalar modulo the group order of the secp256k1 curve. */
 typedef uint32_t secp256k1_scalar;
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_H */
diff --git a/src/secp256k1/src/scalar_low_impl.h b/src/secp256k1/src/scalar_low_impl.h
index 4f94441f4..c80e70c5a 100644
--- a/src/secp256k1/src/scalar_low_impl.h
+++ b/src/secp256k1/src/scalar_low_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_IMPL_H_
-#define _SECP256K1_SCALAR_REPR_IMPL_H_
+#ifndef SECP256K1_SCALAR_REPR_IMPL_H
+#define SECP256K1_SCALAR_REPR_IMPL_H
 
 #include "scalar.h"
 
@@ -111,4 +111,4 @@ SECP256K1_INLINE static int secp256k1_scalar_eq(const secp256k1_scalar *a, const
     return *a == *b;
 }
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_IMPL_H */
diff --git a/src/secp256k1/src/testrand.h b/src/secp256k1/src/testrand.h
index f8efa93c7..f1f9be077 100644
--- a/src/secp256k1/src/testrand.h
+++ b/src/secp256k1/src/testrand.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_TESTRAND_H_
-#define _SECP256K1_TESTRAND_H_
+#ifndef SECP256K1_TESTRAND_H
+#define SECP256K1_TESTRAND_H
 
 #if defined HAVE_CONFIG_H
 #include "libsecp256k1-config.h"
@@ -35,4 +35,4 @@ static void secp256k1_rand256_test(unsigned char *b32);
 /** Generate pseudorandom bytes with long sequences of zero and one bits. */
 static void secp256k1_rand_bytes_test(unsigned char *bytes, size_t len);
 
-#endif
+#endif /* SECP256K1_TESTRAND_H */
diff --git a/src/secp256k1/src/testrand_impl.h b/src/secp256k1/src/testrand_impl.h
index 15c7b9f12..125557420 100644
--- a/src/secp256k1/src/testrand_impl.h
+++ b/src/secp256k1/src/testrand_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_TESTRAND_IMPL_H_
-#define _SECP256K1_TESTRAND_IMPL_H_
+#ifndef SECP256K1_TESTRAND_IMPL_H
+#define SECP256K1_TESTRAND_IMPL_H
 
 #include <stdint.h>
 #include <string.h>
@@ -107,4 +107,4 @@ static void secp256k1_rand256_test(unsigned char *b32) {
     secp256k1_rand_bytes_test(b32, 32);
 }
 
-#endif
+#endif /* SECP256K1_TESTRAND_IMPL_H */
diff --git a/src/secp256k1/src/util.h b/src/secp256k1/src/util.h
index 4092a86c9..b0441d8e3 100644
--- a/src/secp256k1/src/util.h
+++ b/src/secp256k1/src/util.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_UTIL_H_
-#define _SECP256K1_UTIL_H_
+#ifndef SECP256K1_UTIL_H
+#define SECP256K1_UTIL_H
 
 #if defined HAVE_CONFIG_H
 #include "libsecp256k1-config.h"
@@ -110,4 +110,4 @@ static SECP256K1_INLINE void *checked_malloc(const secp256k1_callback* cb, size_
 SECP256K1_GNUC_EXT typedef unsigned __int128 uint128_t;
 #endif
 
-#endif
+#endif /* SECP256K1_UTIL_H */
diff --git a/src/serialize.h b/src/serialize.h
index 8b86a07a7..eeb05fa76 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -402,7 +402,7 @@ class CVarInt
 protected:
     I &n;
 public:
-    CVarInt(I& nIn) : n(nIn) { }
+    explicit CVarInt(I& nIn) : n(nIn) { }
 
     template<typename Stream>
     void Serialize(Stream &s) const {
@@ -420,7 +420,7 @@ class CCompactSize
 protected:
     uint64_t &n;
 public:
-    CCompactSize(uint64_t& nIn) : n(nIn) { }
+    explicit CCompactSize(uint64_t& nIn) : n(nIn) { }
 
     template<typename Stream>
     void Serialize(Stream &s) const {
@@ -439,7 +439,7 @@ class LimitedString
 protected:
     std::string& string;
 public:
-    LimitedString(std::string& _string) : string(_string) {}
+    explicit LimitedString(std::string& _string) : string(_string) {}
 
     template<typename Stream>
     void Unserialize(Stream& s)
diff --git a/src/streams.h b/src/streams.h
index 245fb9cd8..9a3badea5 100644
--- a/src/streams.h
+++ b/src/streams.h
@@ -82,7 +82,7 @@ class CVectorWriter
  * @param[in]  nVersionIn Serialization Version (including any flags)
  * @param[in]  vchDataIn  Referenced byte vector to overwrite/append
  * @param[in]  nPosIn Starting position. Vector index where writes should start. The vector will initially
- *                    grow as necessary to  max(index, vec.size()). So to append, use vec.size().
+ *                    grow as necessary to  max(nPosIn, vec.size()). So to append, use vec.size().
 */
     CVectorWriter(int nTypeIn, int nVersionIn, std::vector<unsigned char>& vchDataIn, size_t nPosIn) : nType(nTypeIn), nVersion(nVersionIn), vchData(vchDataIn), nPos(nPosIn)
     {
@@ -91,7 +91,7 @@ class CVectorWriter
     }
 /*
  * (other params same as above)
- * @param[in]  args  A list of items to serialize starting at nPos.
+ * @param[in]  args  A list of items to serialize starting at nPosIn.
 */
     template <typename... Args>
     CVectorWriter(int nTypeIn, int nVersionIn, std::vector<unsigned char>& vchDataIn, size_t nPosIn, Args&&... args) : CVectorWriter(nTypeIn, nVersionIn, vchDataIn, nPosIn)
@@ -332,7 +332,7 @@ class CDataStream
     //
     bool eof() const             { return size() == 0; }
     CDataStream* rdbuf()         { return this; }
-    int in_avail()               { return size(); }
+    int in_avail() const         { return size(); }
 
     void SetType(int n)          { nType = n; }
     int GetType() const          { return nType; }
@@ -455,10 +455,6 @@ class CDataStream
 class CAutoFile
 {
 private:
-    // Disallow copies
-    CAutoFile(const CAutoFile&);
-    CAutoFile& operator=(const CAutoFile&);
-
     const int nType;
     const int nVersion;
 
@@ -475,11 +471,15 @@ class CAutoFile
         fclose();
     }
 
+    // Disallow copies
+    CAutoFile(const CAutoFile&) = delete;
+    CAutoFile& operator=(const CAutoFile&) = delete;
+
     void fclose()
     {
         if (file) {
             ::fclose(file);
-            file = NULL;
+            file = nullptr;
         }
     }
 
@@ -487,7 +487,7 @@ class CAutoFile
      * @note This will invalidate the CAutoFile object, and makes it the responsibility of the caller
      * of this function to clean up the returned FILE*.
      */
-    FILE* release()             { FILE* ret = file; file = NULL; return ret; }
+    FILE* release()             { FILE* ret = file; file = nullptr; return ret; }
 
     /** Get wrapped FILE* without transfer of ownership.
      * @note Ownership of the FILE* will remain with this class. Use this only if the scope of the
@@ -495,9 +495,9 @@ class CAutoFile
      */
     FILE* Get() const           { return file; }
 
-    /** Return true if the wrapped FILE* is NULL, false otherwise.
+    /** Return true if the wrapped FILE* is nullptr, false otherwise.
      */
-    bool IsNull() const         { return (file == NULL); }
+    bool IsNull() const         { return (file == nullptr); }
 
     //
     // Stream subset
@@ -508,7 +508,7 @@ class CAutoFile
     void read(char* pch, size_t nSize)
     {
         if (!file)
-            throw std::ios_base::failure("CAutoFile::read: file handle is NULL");
+            throw std::ios_base::failure("CAutoFile::read: file handle is nullptr");
         if (fread(pch, 1, nSize, file) != nSize)
             throw std::ios_base::failure(feof(file) ? "CAutoFile::read: end of file" : "CAutoFile::read: fread failed");
     }
@@ -516,7 +516,7 @@ class CAutoFile
     void ignore(size_t nSize)
     {
         if (!file)
-            throw std::ios_base::failure("CAutoFile::ignore: file handle is NULL");
+            throw std::ios_base::failure("CAutoFile::ignore: file handle is nullptr");
         unsigned char data[4096];
         while (nSize > 0) {
             size_t nNow = std::min<size_t>(nSize, sizeof(data));
@@ -529,7 +529,7 @@ class CAutoFile
     void write(const char* pch, size_t nSize)
     {
         if (!file)
-            throw std::ios_base::failure("CAutoFile::write: file handle is NULL");
+            throw std::ios_base::failure("CAutoFile::write: file handle is nullptr");
         if (fwrite(pch, 1, nSize, file) != nSize)
             throw std::ios_base::failure("CAutoFile::write: write failed");
     }
@@ -539,7 +539,7 @@ class CAutoFile
     {
         // Serialize to this stream
         if (!file)
-            throw std::ios_base::failure("CAutoFile::operator<<: file handle is NULL");
+            throw std::ios_base::failure("CAutoFile::operator<<: file handle is nullptr");
         ::Serialize(*this, obj);
         return (*this);
     }
@@ -549,7 +549,7 @@ class CAutoFile
     {
         // Unserialize from this stream
         if (!file)
-            throw std::ios_base::failure("CAutoFile::operator>>: file handle is NULL");
+            throw std::ios_base::failure("CAutoFile::operator>>: file handle is nullptr");
         ::Unserialize(*this, obj);
         return (*this);
     }
@@ -564,10 +564,6 @@ class CAutoFile
 class CBufferedFile
 {
 private:
-    // Disallow copies
-    CBufferedFile(const CBufferedFile&);
-    CBufferedFile& operator=(const CBufferedFile&);
-
     const int nType;
     const int nVersion;
 
@@ -609,6 +605,10 @@ class CBufferedFile
         fclose();
     }
 
+    // Disallow copies
+    CBufferedFile(const CBufferedFile&) = delete;
+    CBufferedFile& operator=(const CBufferedFile&) = delete;
+
     int GetVersion() const { return nVersion; }
     int GetType() const { return nType; }
 
@@ -616,7 +616,7 @@ class CBufferedFile
     {
         if (src) {
             ::fclose(src);
-            src = NULL;
+            src = nullptr;
         }
     }
 
@@ -648,7 +648,7 @@ class CBufferedFile
     }
 
     // return the current reading position
-    uint64_t GetPos() {
+    uint64_t GetPos() const {
         return nReadPos;
     }
 
diff --git a/src/support/allocators/secure.h b/src/support/allocators/secure.h
index 9daba86ef..39347c73b 100644
--- a/src/support/allocators/secure.h
+++ b/src/support/allocators/secure.h
@@ -26,13 +26,13 @@ struct secure_allocator : public std::allocator<T> {
     typedef typename base::reference reference;
     typedef typename base::const_reference const_reference;
     typedef typename base::value_type value_type;
-    secure_allocator() throw() {}
-    secure_allocator(const secure_allocator& a) throw() : base(a) {}
+    secure_allocator() noexcept {}
+    secure_allocator(const secure_allocator& a) noexcept : base(a) {}
     template <typename U>
-    secure_allocator(const secure_allocator<U>& a) throw() : base(a)
+    secure_allocator(const secure_allocator<U>& a) noexcept : base(a)
     {
     }
-    ~secure_allocator() throw() {}
+    ~secure_allocator() noexcept {}
     template <typename _Other>
     struct rebind {
         typedef secure_allocator<_Other> other;
@@ -45,7 +45,7 @@ struct secure_allocator : public std::allocator<T> {
 
     void deallocate(T* p, std::size_t n)
     {
-        if (p != NULL) {
+        if (p != nullptr) {
             memory_cleanse(p, sizeof(T) * n);
         }
         LockedPoolManager::Instance().free(p);
diff --git a/src/support/allocators/zeroafterfree.h b/src/support/allocators/zeroafterfree.h
index 28a940ad1..618874cee 100644
--- a/src/support/allocators/zeroafterfree.h
+++ b/src/support/allocators/zeroafterfree.h
@@ -22,13 +22,13 @@ struct zero_after_free_allocator : public std::allocator<T> {
     typedef typename base::reference reference;
     typedef typename base::const_reference const_reference;
     typedef typename base::value_type value_type;
-    zero_after_free_allocator() throw() {}
-    zero_after_free_allocator(const zero_after_free_allocator& a) throw() : base(a) {}
+    zero_after_free_allocator() noexcept {}
+    zero_after_free_allocator(const zero_after_free_allocator& a) noexcept : base(a) {}
     template <typename U>
-    zero_after_free_allocator(const zero_after_free_allocator<U>& a) throw() : base(a)
+    zero_after_free_allocator(const zero_after_free_allocator<U>& a) noexcept : base(a)
     {
     }
-    ~zero_after_free_allocator() throw() {}
+    ~zero_after_free_allocator() noexcept {}
     template <typename _Other>
     struct rebind {
         typedef zero_after_free_allocator<_Other> other;
@@ -36,7 +36,7 @@ struct zero_after_free_allocator : public std::allocator<T> {
 
     void deallocate(T* p, std::size_t n)
     {
-        if (p != NULL)
+        if (p != nullptr)
             memory_cleanse(p, sizeof(T) * n);
         std::allocator<T>::deallocate(p, n);
     }
diff --git a/src/support/cleanse.cpp b/src/support/cleanse.cpp
index a2141b244..95899c9f0 100644
--- a/src/support/cleanse.cpp
+++ b/src/support/cleanse.cpp
@@ -5,9 +5,35 @@
 
 #include "cleanse.h"
 
-#include <openssl/crypto.h>
+#include <cstring>
 
+/* Compilers have a bad habit of removing "superfluous" memset calls that
+ * are trying to zero memory. For example, when memset()ing a buffer and
+ * then free()ing it, the compiler might decide that the memset is
+ * unobservable and thus can be removed.
+ *
+ * Previously we used OpenSSL which tried to stop this by a) implementing
+ * memset in assembly on x86 and b) putting the function in its own file
+ * for other platforms.
+ *
+ * This change removes those tricks in favour of using asm directives to
+ * scare the compiler away. As best as our compiler folks can tell, this is
+ * sufficient and will continue to be so.
+ *
+ * Adam Langley <agl@google.com>
+ * Commit: ad1907fe73334d6c696c8539646c21b11178f20f
+ * BoringSSL (LICENSE: ISC)
+ */
 void memory_cleanse(void *ptr, size_t len)
 {
-    OPENSSL_cleanse(ptr, len);
+    std::memset(ptr, 0, len);
+
+    /* As best as we can tell, this is sufficient to break any optimisations that
+       might try to eliminate "superfluous" memsets. If there's an easy way to
+       detect memset_s, it would be better to use that. */
+#if defined(_MSC_VER)
+    __asm;
+#else
+    __asm__ __volatile__("" : : "r"(ptr) : "memory");
+#endif
 }
diff --git a/src/support/events.h b/src/support/events.h
index 90690876e..cc6d29aec 100644
--- a/src/support/events.h
+++ b/src/support/events.h
@@ -47,7 +47,7 @@ inline raii_evhttp_request obtain_evhttp_request(void(*cb)(struct evhttp_request
 }
 
 inline raii_evhttp_connection obtain_evhttp_connection_base(struct event_base* base, std::string host, uint16_t port) {
-    auto result = raii_evhttp_connection(evhttp_connection_base_new(base, NULL, host.c_str(), port));
+    auto result = raii_evhttp_connection(evhttp_connection_base_new(base, nullptr, host.c_str(), port));
     if (!result.get())
         throw std::runtime_error("create connection failed");
     return result;
diff --git a/src/support/lockedpool.cpp b/src/support/lockedpool.cpp
index 2df6b84a5..2ead72185 100644
--- a/src/support/lockedpool.cpp
+++ b/src/support/lockedpool.cpp
@@ -28,7 +28,7 @@
 
 #include <algorithm>
 
-LockedPoolManager* LockedPoolManager::_instance = NULL;
+LockedPoolManager* LockedPoolManager::_instance = nullptr;
 std::once_flag LockedPoolManager::init_flag;
 
 /*******************************************************************************/
@@ -87,7 +87,7 @@ template <class Iterator, class Pair> bool extend(Iterator it, const Pair& other
 
 void Arena::free(void *ptr)
 {
-    // Freeing the NULL pointer is OK.
+    // Freeing the nullptr pointer is OK.
     if (ptr == nullptr) {
         return;
     }
diff --git a/src/support/lockedpool.h b/src/support/lockedpool.h
index f5212bc26..834f0371e 100644
--- a/src/support/lockedpool.h
+++ b/src/support/lockedpool.h
@@ -50,6 +50,9 @@ class Arena
     Arena(void *base, size_t size, size_t alignment);
     virtual ~Arena();
 
+    Arena(const Arena& other) = delete; // non construction-copyable
+    Arena& operator=(const Arena&) = delete; // non copyable
+
     /** Memory statistics. */
     struct Stats
     {
@@ -85,9 +88,6 @@ class Arena
      */
     bool addressInArena(void *ptr) const { return ptr >= base && ptr < end; }
 private:
-    Arena(const Arena& other) = delete; // non construction-copyable
-    Arena& operator=(const Arena&) = delete; // non copyable
-
     /** Map of chunk address to chunk information. This class makes use of the
      * sorted order to merge previous and next chunks during deallocation.
      */
@@ -150,9 +150,12 @@ class LockedPool
      * If this callback is provided and returns false, the allocation fails (hard fail), if
      * it returns true the allocation proceeds, but it could warn.
      */
-    LockedPool(std::unique_ptr<LockedPageAllocator> allocator, LockingFailed_Callback lf_cb_in = 0);
+    explicit LockedPool(std::unique_ptr<LockedPageAllocator> allocator, LockingFailed_Callback lf_cb_in = nullptr);
     ~LockedPool();
 
+    LockedPool(const LockedPool& other) = delete; // non construction-copyable
+    LockedPool& operator=(const LockedPool&) = delete; // non copyable
+
     /** Allocate size bytes from this arena.
      * Returns pointer on success, or 0 if memory is full or
      * the application tried to allocate 0 bytes.
@@ -168,9 +171,6 @@ class LockedPool
     /** Get pool usage statistics */
     Stats stats() const;
 private:
-    LockedPool(const LockedPool& other) = delete; // non construction-copyable
-    LockedPool& operator=(const LockedPool&) = delete; // non copyable
-
     std::unique_ptr<LockedPageAllocator> allocator;
 
     /** Create an arena from locked pages */
@@ -217,7 +217,7 @@ class LockedPoolManager : public LockedPool
     }
 
 private:
-    LockedPoolManager(std::unique_ptr<LockedPageAllocator> allocator);
+    explicit LockedPoolManager(std::unique_ptr<LockedPageAllocator> allocator);
 
     /** Create a new LockedPoolManager specialized to the OS */
     static void CreateInstance();
diff --git a/src/sync.cpp b/src/sync.cpp
index c359e8220..87024ccdf 100644
--- a/src/sync.cpp
+++ b/src/sync.cpp
@@ -98,9 +98,9 @@ static void potential_deadlock_detected(const std::pair<void*, void*>& mismatch,
     assert(false);
 }
 
-static void push_lock(void* c, const CLockLocation& locklocation, bool fTry)
+static void push_lock(void* c, const CLockLocation& locklocation)
 {
-    if (lockstack.get() == NULL)
+    if (lockstack.get() == nullptr)
         lockstack.reset(new LockStack);
 
     boost::unique_lock<boost::mutex> lock(lockdata.dd_mutex);
@@ -130,7 +130,7 @@ static void pop_lock()
 
 void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry)
 {
-    push_lock(cs, CLockLocation(pszName, pszFile, nLine, fTry), fTry);
+    push_lock(cs, CLockLocation(pszName, pszFile, nLine, fTry));
 }
 
 void LeaveCritical()
@@ -162,7 +162,7 @@ void DeleteLock(void* cs)
         return;
     }
     boost::unique_lock<boost::mutex> lock(lockdata.dd_mutex);
-    std::pair<void*, void*> item = std::make_pair(cs, (void*)0);
+    std::pair<void*, void*> item = std::make_pair(cs, nullptr);
     LockOrders::iterator it = lockdata.lockorders.lower_bound(item);
     while (it != lockdata.lockorders.end() && it->first.first == cs) {
         std::pair<void*, void*> invitem = std::make_pair(it->first.second, it->first.first);
diff --git a/src/sync.h b/src/sync.h
index 20974f5fb..0871c5fb4 100644
--- a/src/sync.h
+++ b/src/sync.h
@@ -196,7 +196,7 @@ class CSemaphore
     int value;
 
 public:
-    CSemaphore(int init) : value(init) {}
+    explicit CSemaphore(int init) : value(init) {}
 
     void wait()
     {
@@ -265,9 +265,9 @@ class CSemaphoreGrant
         fHaveGrant = false;
     }
 
-    CSemaphoreGrant() : sem(NULL), fHaveGrant(false) {}
+    CSemaphoreGrant() : sem(nullptr), fHaveGrant(false) {}
 
-    CSemaphoreGrant(CSemaphore& sema, bool fTry = false) : sem(&sema), fHaveGrant(false)
+    explicit CSemaphoreGrant(CSemaphore& sema, bool fTry = false) : sem(&sema), fHaveGrant(false)
     {
         if (fTry)
             TryAcquire();
@@ -280,7 +280,7 @@ class CSemaphoreGrant
         Release();
     }
 
-    operator bool()
+    operator bool() const
     {
         return fHaveGrant;
     }
diff --git a/src/test/DoS_tests.cpp b/src/test/DoS_tests.cpp
index 4a284517a..7bcf30483 100644
--- a/src/test/DoS_tests.cpp
+++ b/src/test/DoS_tests.cpp
@@ -42,6 +42,51 @@ static NodeId id = 0;
 
 BOOST_FIXTURE_TEST_SUITE(DoS_tests, TestingSetup)
 
+// Test eviction of an outbound peer whose chain never advances
+// Mock a node connection, and use mocktime to simulate a peer
+// which never sends any headers messages.  PeerLogic should
+// decide to evict that outbound peer, after the appropriate timeouts.
+// Note that we protect 4 outbound nodes from being subject to
+// this logic; this test takes advantage of that protection only
+// being applied to nodes which send headers with sufficient
+// work.
+BOOST_AUTO_TEST_CASE(outbound_slow_chain_eviction)
+{
+    std::atomic<bool> interruptDummy(false);
+
+    // Mock an outbound peer
+    CAddress addr1(ip(0xa0b0c001), NODE_NONE);
+    CNode dummyNode1(id++, ServiceFlags(NODE_NETWORK|NODE_WITNESS), 0, INVALID_SOCKET, addr1, 0, 0, CAddress(), "", /*fInboundIn=*/ false);
+    dummyNode1.SetSendVersion(PROTOCOL_VERSION);
+
+    peerLogic->InitializeNode(&dummyNode1);
+    dummyNode1.nVersion = 1;
+    dummyNode1.fSuccessfullyConnected = true;
+
+    // This test requires that we have a chain with non-zero work.
+    BOOST_CHECK(chainActive.Tip() != nullptr);
+    BOOST_CHECK(chainActive.Tip()->nChainWork > 0);
+
+    // Test starts here
+    peerLogic->SendMessages(&dummyNode1, interruptDummy); // should result in getheaders
+    BOOST_CHECK(dummyNode1.vSendMsg.size() > 0);
+    dummyNode1.vSendMsg.clear();
+
+    int64_t nStartTime = GetTime();
+    // Wait 21 minutes
+    SetMockTime(nStartTime+21*60);
+    peerLogic->SendMessages(&dummyNode1, interruptDummy); // should result in getheaders
+    BOOST_CHECK(dummyNode1.vSendMsg.size() > 0);
+    // Wait 3 more minutes
+    SetMockTime(nStartTime+24*60);
+    peerLogic->SendMessages(&dummyNode1, interruptDummy); // should result in disconnect
+    BOOST_CHECK(dummyNode1.fDisconnect == true);
+    SetMockTime(0);
+
+    bool dummy;
+    peerLogic->FinalizeNode(dummyNode1.GetId(), dummy);
+}
+
 BOOST_AUTO_TEST_CASE(DoS_banning)
 {
     std::atomic<bool> interruptDummy(false);
@@ -50,27 +95,31 @@ BOOST_AUTO_TEST_CASE(DoS_banning)
     CAddress addr1(ip(0xa0b0c001), NODE_NONE);
     CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, 0, 0, CAddress(), "", true);
     dummyNode1.SetSendVersion(PROTOCOL_VERSION);
-    GetNodeSignals().InitializeNode(&dummyNode1, *connman);
+    peerLogic->InitializeNode(&dummyNode1);
     dummyNode1.nVersion = 1;
     dummyNode1.fSuccessfullyConnected = true;
     Misbehaving(dummyNode1.GetId(), 100); // Should get banned
-    SendMessages(&dummyNode1, *connman, interruptDummy);
+    peerLogic->SendMessages(&dummyNode1, interruptDummy);
     BOOST_CHECK(connman->IsBanned(addr1));
     BOOST_CHECK(!connman->IsBanned(ip(0xa0b0c001|0x0000ff00))); // Different IP, not banned
 
     CAddress addr2(ip(0xa0b0c002), NODE_NONE);
     CNode dummyNode2(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr2, 1, 1, CAddress(), "", true);
     dummyNode2.SetSendVersion(PROTOCOL_VERSION);
-    GetNodeSignals().InitializeNode(&dummyNode2, *connman);
+    peerLogic->InitializeNode(&dummyNode2);
     dummyNode2.nVersion = 1;
     dummyNode2.fSuccessfullyConnected = true;
     Misbehaving(dummyNode2.GetId(), 50);
-    SendMessages(&dummyNode2, *connman, interruptDummy);
+    peerLogic->SendMessages(&dummyNode2, interruptDummy);
     BOOST_CHECK(!connman->IsBanned(addr2)); // 2 not banned yet...
     BOOST_CHECK(connman->IsBanned(addr1));  // ... but 1 still should be
     Misbehaving(dummyNode2.GetId(), 50);
-    SendMessages(&dummyNode2, *connman, interruptDummy);
+    peerLogic->SendMessages(&dummyNode2, interruptDummy);
     BOOST_CHECK(connman->IsBanned(addr2));
+
+    bool dummy;
+    peerLogic->FinalizeNode(dummyNode1.GetId(), dummy);
+    peerLogic->FinalizeNode(dummyNode2.GetId(), dummy);
 }
 
 BOOST_AUTO_TEST_CASE(DoS_banscore)
@@ -78,23 +127,26 @@ BOOST_AUTO_TEST_CASE(DoS_banscore)
     std::atomic<bool> interruptDummy(false);
 
     connman->ClearBanned();
-    ForceSetArg("-banscore", "111"); // because 11 is my favorite number
+    gArgs.ForceSetArg("-banscore", "111"); // because 11 is my favorite number
     CAddress addr1(ip(0xa0b0c001), NODE_NONE);
     CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, 3, 1, CAddress(), "", true);
     dummyNode1.SetSendVersion(PROTOCOL_VERSION);
-    GetNodeSignals().InitializeNode(&dummyNode1, *connman);
+    peerLogic->InitializeNode(&dummyNode1);
     dummyNode1.nVersion = 1;
     dummyNode1.fSuccessfullyConnected = true;
     Misbehaving(dummyNode1.GetId(), 100);
-    SendMessages(&dummyNode1, *connman, interruptDummy);
+    peerLogic->SendMessages(&dummyNode1, interruptDummy);
     BOOST_CHECK(!connman->IsBanned(addr1));
     Misbehaving(dummyNode1.GetId(), 10);
-    SendMessages(&dummyNode1, *connman, interruptDummy);
+    peerLogic->SendMessages(&dummyNode1, interruptDummy);
     BOOST_CHECK(!connman->IsBanned(addr1));
     Misbehaving(dummyNode1.GetId(), 1);
-    SendMessages(&dummyNode1, *connman, interruptDummy);
+    peerLogic->SendMessages(&dummyNode1, interruptDummy);
     BOOST_CHECK(connman->IsBanned(addr1));
-    ForceSetArg("-banscore", std::to_string(DEFAULT_BANSCORE_THRESHOLD));
+    gArgs.ForceSetArg("-banscore", std::to_string(DEFAULT_BANSCORE_THRESHOLD));
+
+    bool dummy;
+    peerLogic->FinalizeNode(dummyNode1.GetId(), dummy);
 }
 
 BOOST_AUTO_TEST_CASE(DoS_bantime)
@@ -108,12 +160,12 @@ BOOST_AUTO_TEST_CASE(DoS_bantime)
     CAddress addr(ip(0xa0b0c001), NODE_NONE);
     CNode dummyNode(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr, 4, 4, CAddress(), "", true);
     dummyNode.SetSendVersion(PROTOCOL_VERSION);
-    GetNodeSignals().InitializeNode(&dummyNode, *connman);
+    peerLogic->InitializeNode(&dummyNode);
     dummyNode.nVersion = 1;
     dummyNode.fSuccessfullyConnected = true;
 
     Misbehaving(dummyNode.GetId(), 100);
-    SendMessages(&dummyNode, *connman, interruptDummy);
+    peerLogic->SendMessages(&dummyNode, interruptDummy);
     BOOST_CHECK(connman->IsBanned(addr));
 
     SetMockTime(nStartTime+60*60);
@@ -121,6 +173,9 @@ BOOST_AUTO_TEST_CASE(DoS_bantime)
 
     SetMockTime(nStartTime+60*60*24+1);
     BOOST_CHECK(!connman->IsBanned(addr));
+
+    bool dummy;
+    peerLogic->FinalizeNode(dummyNode.GetId(), dummy);
 }
 
 CTransactionRef RandomOrphan()
diff --git a/src/test/README.md b/src/test/README.md
index eeb04c6ff..dbaa9c27f 100644
--- a/src/test/README.md
+++ b/src/test/README.md
@@ -5,7 +5,10 @@ and tests weren't explicitly disabled.
 
 After configuring, they can be run with `make check`.
 
-To run the bitcoind tests manually, launch `src/test/test_bitcoin`.
+To run the bitcoind tests manually, launch `src/test/test_bitcoin`. To recompile
+after a test file was modified, run `make` and then run the test again. If you
+modify a non-test file, use `make -C src/test` to recompile only what's needed
+to run the bitcoind tests.
 
 To add more bitcoind tests, add `BOOST_AUTO_TEST_CASE` functions to the existing
 .cpp files in the `test/` directory or add new .cpp files that
diff --git a/src/test/addrman_tests.cpp b/src/test/addrman_tests.cpp
index bc6aef2c1..7be29c6d6 100644
--- a/src/test/addrman_tests.cpp
+++ b/src/test/addrman_tests.cpp
@@ -15,9 +15,14 @@ class CAddrManTest : public CAddrMan
     uint64_t state;
 
 public:
-    CAddrManTest()
+    explicit CAddrManTest(bool makeDeterministic = true)
     {
         state = 1;
+
+        if (makeDeterministic) {
+            //  Set addrman addr placement to be deterministic.
+            MakeDeterministic();
+        }
     }
 
     //! Ensure that bucket placement is always the same for testing purposes.
@@ -33,12 +38,12 @@ class CAddrManTest : public CAddrMan
         return (unsigned int)(state % nMax);
     }
 
-    CAddrInfo* Find(const CNetAddr& addr, int* pnId = NULL)
+    CAddrInfo* Find(const CNetAddr& addr, int* pnId = nullptr)
     {
         return CAddrMan::Find(addr, pnId);
     }
 
-    CAddrInfo* Create(const CAddress& addr, const CNetAddr& addrSource, int* pnId = NULL)
+    CAddrInfo* Create(const CAddress& addr, const CNetAddr& addrSource, int* pnId = nullptr)
     {
         return CAddrMan::Create(addr, addrSource, pnId);
     }
@@ -79,9 +84,6 @@ BOOST_AUTO_TEST_CASE(addrman_simple)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     CNetAddr source = ResolveIP("252.2.2.2");
 
     // Test: Does Addrman respond correctly when empty.
@@ -131,9 +133,6 @@ BOOST_AUTO_TEST_CASE(addrman_ports)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     CNetAddr source = ResolveIP("252.2.2.2");
 
     BOOST_CHECK_EQUAL(addrman.size(), 0);
@@ -163,9 +162,6 @@ BOOST_AUTO_TEST_CASE(addrman_select)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     CNetAddr source = ResolveIP("252.2.2.2");
 
     // Test: Select from new with 1 addr in new.
@@ -225,9 +221,6 @@ BOOST_AUTO_TEST_CASE(addrman_new_collisions)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     CNetAddr source = ResolveIP("252.2.2.2");
 
     BOOST_CHECK_EQUAL(addrman.size(), 0);
@@ -254,9 +247,6 @@ BOOST_AUTO_TEST_CASE(addrman_tried_collisions)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     CNetAddr source = ResolveIP("252.2.2.2");
 
     BOOST_CHECK_EQUAL(addrman.size(), 0);
@@ -284,9 +274,6 @@ BOOST_AUTO_TEST_CASE(addrman_find)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     BOOST_CHECK_EQUAL(addrman.size(), 0);
 
     CAddress addr1 = CAddress(ResolveService("250.1.2.1", 8333), NODE_NONE);
@@ -320,9 +307,6 @@ BOOST_AUTO_TEST_CASE(addrman_create)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     BOOST_CHECK_EQUAL(addrman.size(), 0);
 
     CAddress addr1 = CAddress(ResolveService("250.1.2.1", 8333), NODE_NONE);
@@ -343,9 +327,6 @@ BOOST_AUTO_TEST_CASE(addrman_delete)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     BOOST_CHECK_EQUAL(addrman.size(), 0);
 
     CAddress addr1 = CAddress(ResolveService("250.1.2.1", 8333), NODE_NONE);
@@ -359,16 +340,13 @@ BOOST_AUTO_TEST_CASE(addrman_delete)
     addrman.Delete(nId);
     BOOST_CHECK_EQUAL(addrman.size(), 0);
     CAddrInfo* info2 = addrman.Find(addr1);
-    BOOST_CHECK(info2 == NULL);
+    BOOST_CHECK(info2 == nullptr);
 }
 
 BOOST_AUTO_TEST_CASE(addrman_getaddr)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     // Test: Sanity check, GetAddr should never return anything if addrman
     //  is empty.
     BOOST_CHECK_EQUAL(addrman.size(), 0);
@@ -430,9 +408,6 @@ BOOST_AUTO_TEST_CASE(caddrinfo_get_tried_bucket)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     CAddress addr1 = CAddress(ResolveService("250.1.1.1", 8333), NODE_NONE);
     CAddress addr2 = CAddress(ResolveService("250.1.1.1", 9999), NODE_NONE);
 
@@ -487,9 +462,6 @@ BOOST_AUTO_TEST_CASE(caddrinfo_get_new_bucket)
 {
     CAddrManTest addrman;
 
-    // Set addrman addr placement to be deterministic.
-    addrman.MakeDeterministic();
-
     CAddress addr1 = CAddress(ResolveService("250.1.2.1", 8333), NODE_NONE);
     CAddress addr2 = CAddress(ResolveService("250.1.2.1", 9999), NODE_NONE);
 
diff --git a/src/test/base58_tests.cpp b/src/test/base58_tests.cpp
index b33cdb9fe..6bc6dd518 100644
--- a/src/test/base58_tests.cpp
+++ b/src/test/base58_tests.cpp
@@ -10,14 +10,15 @@
 
 #include "key.h"
 #include "script/script.h"
+#include "test/test_bitcoin.h"
 #include "uint256.h"
 #include "util.h"
 #include "utilstrencodings.h"
-#include "test/test_bitcoin.h"
+
+#include <univalue.h>
 
 #include <boost/test/unit_test.hpp>
 
-#include <univalue.h>
 
 extern UniValue read_json(const std::string& jsondata);
 
@@ -72,63 +73,18 @@ BOOST_AUTO_TEST_CASE(base58_DecodeBase58)
     BOOST_CHECK_EQUAL_COLLECTIONS(result.begin(), result.end(), expected.begin(), expected.end());
 }
 
-// Visitor to check address type
-class TestAddrTypeVisitor : public boost::static_visitor<bool>
-{
-private:
-    std::string exp_addrType;
-public:
-    TestAddrTypeVisitor(const std::string &_exp_addrType) : exp_addrType(_exp_addrType) { }
-    bool operator()(const CKeyID &id) const
-    {
-        return (exp_addrType == "pubkey");
-    }
-    bool operator()(const CScriptID &id) const
-    {
-        return (exp_addrType == "script");
-    }
-    bool operator()(const CNoDestination &no) const
-    {
-        return (exp_addrType == "none");
-    }
-};
-
-// Visitor to check address payload
-class TestPayloadVisitor : public boost::static_visitor<bool>
-{
-private:
-    std::vector<unsigned char> exp_payload;
-public:
-    TestPayloadVisitor(std::vector<unsigned char> &_exp_payload) : exp_payload(_exp_payload) { }
-    bool operator()(const CKeyID &id) const
-    {
-        uint160 exp_key(exp_payload);
-        return exp_key == id;
-    }
-    bool operator()(const CScriptID &id) const
-    {
-        uint160 exp_key(exp_payload);
-        return exp_key == id;
-    }
-    bool operator()(const CNoDestination &no) const
-    {
-        return exp_payload.size() == 0;
-    }
-};
-
 // Goal: check that parsed keys match test payload
 BOOST_AUTO_TEST_CASE(base58_keys_valid_parse)
 {
     UniValue tests = read_json(std::string(json_tests::base58_keys_valid, json_tests::base58_keys_valid + sizeof(json_tests::base58_keys_valid)));
     CBitcoinSecret secret;
-    CBitcoinAddress addr;
+    CTxDestination destination;
     SelectParams(CBaseChainParams::MAIN);
 
     for (unsigned int idx = 0; idx < tests.size(); idx++) {
         UniValue test = tests[idx];
         std::string strTest = test.write();
-        if (test.size() < 3) // Allow for extra stuff (useful for comments)
-        {
+        if (test.size() < 3) { // Allow for extra stuff (useful for comments)
             BOOST_ERROR("Bad test: " << strTest);
             continue;
         }
@@ -136,16 +92,11 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_parse)
         std::vector<unsigned char> exp_payload = ParseHex(test[1].get_str());
         const UniValue &metadata = test[2].get_obj();
         bool isPrivkey = find_value(metadata, "isPrivkey").get_bool();
-        bool isTestnet = find_value(metadata, "isTestnet").get_bool();
-        if (isTestnet)
-            SelectParams(CBaseChainParams::TESTNET);
-        else
-            SelectParams(CBaseChainParams::MAIN);
-        if(isPrivkey)
-        {
+        SelectParams(find_value(metadata, "chain").get_str());
+        bool try_case_flip = find_value(metadata, "tryCaseFlip").isNull() ? false : find_value(metadata, "tryCaseFlip").get_bool();
+        if (isPrivkey) {
             bool isCompressed = find_value(metadata, "isCompressed").get_bool();
             // Must be valid private key
-            // Note: CBitcoinSecret::SetString tests isValid, whereas CBitcoinAddress does not!
             BOOST_CHECK_MESSAGE(secret.SetString(exp_base58string), "!SetString:"+ strTest);
             BOOST_CHECK_MESSAGE(secret.IsValid(), "!IsValid:" + strTest);
             CKey privkey = secret.GetKey();
@@ -153,18 +104,29 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_parse)
             BOOST_CHECK_MESSAGE(privkey.size() == exp_payload.size() && std::equal(privkey.begin(), privkey.end(), exp_payload.begin()), "key mismatch:" + strTest);
 
             // Private key must be invalid public key
-            addr.SetString(exp_base58string);
-            BOOST_CHECK_MESSAGE(!addr.IsValid(), "IsValid privkey as pubkey:" + strTest);
-        }
-        else
-        {
-            std::string exp_addrType = find_value(metadata, "addrType").get_str(); // "script" or "pubkey"
+            destination = DecodeDestination(exp_base58string);
+            BOOST_CHECK_MESSAGE(!IsValidDestination(destination), "IsValid privkey as pubkey:" + strTest);
+        } else {
             // Must be valid public key
-            BOOST_CHECK_MESSAGE(addr.SetString(exp_base58string), "SetString:" + strTest);
-            BOOST_CHECK_MESSAGE(addr.IsValid(), "!IsValid:" + strTest);
-            BOOST_CHECK_MESSAGE(addr.IsScript() == (exp_addrType == "script"), "isScript mismatch" + strTest);
-            CTxDestination dest = addr.Get();
-            BOOST_CHECK_MESSAGE(boost::apply_visitor(TestAddrTypeVisitor(exp_addrType), dest), "addrType mismatch" + strTest);
+            destination = DecodeDestination(exp_base58string);
+            CScript script = GetScriptForDestination(destination);
+            BOOST_CHECK_MESSAGE(IsValidDestination(destination), "!IsValid:" + strTest);
+            BOOST_CHECK_EQUAL(HexStr(script), HexStr(exp_payload));
+
+            // Try flipped case version
+            for (char& c : exp_base58string) {
+                if (c >= 'a' && c <= 'z') {
+                    c = (c - 'a') + 'A';
+                } else if (c >= 'A' && c <= 'Z') {
+                    c = (c - 'A') + 'a';
+                }
+            }
+            destination = DecodeDestination(exp_base58string);
+            BOOST_CHECK_MESSAGE(IsValidDestination(destination) == try_case_flip, "!IsValid case flipped:" + strTest);
+            if (IsValidDestination(destination)) {
+                script = GetScriptForDestination(destination);
+                BOOST_CHECK_EQUAL(HexStr(script), HexStr(exp_payload));
+            }
 
             // Public key must be invalid private key
             secret.SetString(exp_base58string);
@@ -190,13 +152,8 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_gen)
         std::vector<unsigned char> exp_payload = ParseHex(test[1].get_str());
         const UniValue &metadata = test[2].get_obj();
         bool isPrivkey = find_value(metadata, "isPrivkey").get_bool();
-        bool isTestnet = find_value(metadata, "isTestnet").get_bool();
-        if (isTestnet)
-            SelectParams(CBaseChainParams::TESTNET);
-        else
-            SelectParams(CBaseChainParams::MAIN);
-        if(isPrivkey)
-        {
+        SelectParams(find_value(metadata, "chain").get_str());
+        if (isPrivkey) {
             bool isCompressed = find_value(metadata, "isCompressed").get_bool();
             CKey key;
             key.Set(exp_payload.begin(), exp_payload.end(), isCompressed);
@@ -204,48 +161,26 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_gen)
             CBitcoinSecret secret;
             secret.SetKey(key);
             BOOST_CHECK_MESSAGE(secret.ToString() == exp_base58string, "result mismatch: " + strTest);
-        }
-        else
-        {
-            std::string exp_addrType = find_value(metadata, "addrType").get_str();
+        } else {
             CTxDestination dest;
-            if(exp_addrType == "pubkey")
-            {
-                dest = CKeyID(uint160(exp_payload));
-            }
-            else if(exp_addrType == "script")
-            {
-                dest = CScriptID(uint160(exp_payload));
-            }
-            else if(exp_addrType == "none")
-            {
-                dest = CNoDestination();
-            }
-            else
-            {
-                BOOST_ERROR("Bad addrtype: " << strTest);
-                continue;
-            }
-            CBitcoinAddress addrOut;
-            BOOST_CHECK_MESSAGE(addrOut.Set(dest), "encode dest: " + strTest);
-            BOOST_CHECK_MESSAGE(addrOut.ToString() == exp_base58string, "mismatch: " + strTest);
+            CScript exp_script(exp_payload.begin(), exp_payload.end());
+            ExtractDestination(exp_script, dest);
+            std::string address = EncodeDestination(dest);
+
+            BOOST_CHECK_EQUAL(address, exp_base58string);
         }
     }
 
-    // Visiting a CNoDestination must fail
-    CBitcoinAddress dummyAddr;
-    CTxDestination nodest = CNoDestination();
-    BOOST_CHECK(!dummyAddr.Set(nodest));
-
     SelectParams(CBaseChainParams::MAIN);
 }
 
+
 // Goal: check that base58 parsing code is robust against a variety of corrupted data
 BOOST_AUTO_TEST_CASE(base58_keys_invalid)
 {
     UniValue tests = read_json(std::string(json_tests::base58_keys_invalid, json_tests::base58_keys_invalid + sizeof(json_tests::base58_keys_invalid))); // Negative testcases
     CBitcoinSecret secret;
-    CBitcoinAddress addr;
+    CTxDestination destination;
 
     for (unsigned int idx = 0; idx < tests.size(); idx++) {
         UniValue test = tests[idx];
@@ -258,13 +193,15 @@ BOOST_AUTO_TEST_CASE(base58_keys_invalid)
         std::string exp_base58string = test[0].get_str();
 
         // must be invalid as public and as private key
-        addr.SetString(exp_base58string);
-        BOOST_CHECK_MESSAGE(!addr.IsValid(), "IsValid pubkey:" + strTest);
-        secret.SetString(exp_base58string);
-        BOOST_CHECK_MESSAGE(!secret.IsValid(), "IsValid privkey:" + strTest);
+        for (auto chain : { CBaseChainParams::MAIN, CBaseChainParams::TESTNET, CBaseChainParams::REGTEST }) {
+            SelectParams(chain);
+            destination = DecodeDestination(exp_base58string);
+            BOOST_CHECK_MESSAGE(!IsValidDestination(destination), "IsValid pubkey in mainnet:" + strTest);
+            secret.SetString(exp_base58string);
+            BOOST_CHECK_MESSAGE(!secret.IsValid(), "IsValid privkey in mainnet:" + strTest);
+        }
     }
 }
 
 
 BOOST_AUTO_TEST_SUITE_END()
-
diff --git a/src/test/bech32_tests.cpp b/src/test/bech32_tests.cpp
new file mode 100644
index 000000000..ce4cddd64
--- /dev/null
+++ b/src/test/bech32_tests.cpp
@@ -0,0 +1,67 @@
+// Copyright (c) 2017 Pieter Wuille
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "bech32.h"
+#include "test/test_bitcoin.h"
+
+#include <boost/test/unit_test.hpp>
+
+BOOST_FIXTURE_TEST_SUITE(bech32_tests, BasicTestingSetup)
+
+bool CaseInsensitiveEqual(const std::string &s1, const std::string &s2)
+{
+    if (s1.size() != s2.size()) return false;
+    for (size_t i = 0; i < s1.size(); ++i) {
+        char c1 = s1[i];
+        if (c1 >= 'A' && c1 <= 'Z') c1 -= ('A' - 'a');
+        char c2 = s2[i];
+        if (c2 >= 'A' && c2 <= 'Z') c2 -= ('A' - 'a');
+        if (c1 != c2) return false;
+    }
+    return true;
+}
+
+BOOST_AUTO_TEST_CASE(bip173_testvectors_valid)
+{
+    static const std::string CASES[] = {
+        "A12UEL5L",
+        "a12uel5l",
+        "an83characterlonghumanreadablepartthatcontainsthenumber1andtheexcludedcharactersbio1tt5tgs",
+        "abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw",
+        "11qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqc8247j",
+        "split1checkupstagehandshakeupstreamerranterredcaperred2y9e3w",
+        "?1ezyfcl",
+    };
+    for (const std::string& str : CASES) {
+        auto ret = bech32::Decode(str);
+        BOOST_CHECK(!ret.first.empty());
+        std::string recode = bech32::Encode(ret.first, ret.second);
+        BOOST_CHECK(!recode.empty());
+        BOOST_CHECK(CaseInsensitiveEqual(str, recode));
+    }
+}
+
+BOOST_AUTO_TEST_CASE(bip173_testvectors_invalid)
+{
+    static const std::string CASES[] = {
+        " 1nwldj5",
+        "\x7f""1axkwrx",
+        "\x80""1eym55h",
+        "an84characterslonghumanreadablepartthatcontainsthenumber1andtheexcludedcharactersbio1569pvx",
+        "pzry9x0s0muk",
+        "1pzry9x0s0muk",
+        "x1b4n0q5v",
+        "li1dgmt3",
+        "de1lg7wt\xff",
+        "A1G7SGD8",
+        "10a06t8",
+        "1qzzfhee",
+    };
+    for (const std::string& str : CASES) {
+        auto ret = bech32::Decode(str);
+        BOOST_CHECK(ret.first.empty());
+    }
+}
+
+BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/bip32_tests.cpp b/src/test/bip32_tests.cpp
index 6bcd550d7..e123c26ad 100644
--- a/src/test/bip32_tests.cpp
+++ b/src/test/bip32_tests.cpp
@@ -24,7 +24,7 @@ struct TestVector {
     std::string strHexMaster;
     std::vector<TestDerivation> vDerive;
 
-    TestVector(std::string strHexMasterIn) : strHexMaster(strHexMasterIn) {}
+    explicit TestVector(std::string strHexMasterIn) : strHexMaster(strHexMasterIn) {}
 
     TestVector& operator()(std::string pub, std::string prv, unsigned int nChild) {
         vDerive.push_back(TestDerivation());
@@ -91,7 +91,7 @@ void RunTest(const TestVector &test) {
     std::vector<unsigned char> seed = ParseHex(test.strHexMaster);
     CExtKey key;
     CExtPubKey pubkey;
-    key.SetMaster(&seed[0], seed.size());
+    key.SetMaster(seed.data(), seed.size());
     pubkey = key.Neuter();
     for (const TestDerivation &derive : test.vDerive) {
         unsigned char data[74];
diff --git a/src/test/blockencodings_tests.cpp b/src/test/blockencodings_tests.cpp
index 10a40fea3..f2d5b385d 100644
--- a/src/test/blockencodings_tests.cpp
+++ b/src/test/blockencodings_tests.cpp
@@ -51,7 +51,7 @@ static CBlock BuildBlockTestCase() {
     return block;
 }
 
-// Number of shared use_counts we expect for a tx we havent touched
+// Number of shared use_counts we expect for a tx we haven't touched
 // == 2 (mempool + our copy from the GetSharedTx call)
 #define SHARED_TX_OFFSET 2
 
@@ -118,12 +118,12 @@ class TestHeaderAndShortIDs {
     std::vector<uint64_t> shorttxids;
     std::vector<PrefilledTransaction> prefilledtxn;
 
-    TestHeaderAndShortIDs(const CBlockHeaderAndShortTxIDs& orig) {
+    explicit TestHeaderAndShortIDs(const CBlockHeaderAndShortTxIDs& orig) {
         CDataStream stream(SER_NETWORK, PROTOCOL_VERSION);
         stream << orig;
         stream >> *this;
     }
-    TestHeaderAndShortIDs(const CBlock& block) :
+    explicit TestHeaderAndShortIDs(const CBlock& block) :
         TestHeaderAndShortIDs(CBlockHeaderAndShortTxIDs(block, true)) {}
 
     uint64_t GetShortID(const uint256& txhash) const {
diff --git a/src/test/bloom_tests.cpp b/src/test/bloom_tests.cpp
index 2085b5cb2..eac2c102a 100644
--- a/src/test/bloom_tests.cpp
+++ b/src/test/bloom_tests.cpp
@@ -8,6 +8,7 @@
 #include "clientversion.h"
 #include "key.h"
 #include "merkleblock.h"
+#include "primitives/block.h"
 #include "random.h"
 #include "serialize.h"
 #include "streams.h"
@@ -154,8 +155,8 @@ BOOST_AUTO_TEST_CASE(bloom_match)
     COutPoint prevOutPoint(uint256S("0x90c122d70786e899529d71dbeba91ba216982fb6ba58f3bdaab65e73b7e9260b"), 0);
     {
         std::vector<unsigned char> data(32 + sizeof(unsigned int));
-        memcpy(&data[0], prevOutPoint.hash.begin(), 32);
-        memcpy(&data[32], &prevOutPoint.n, sizeof(unsigned int));
+        memcpy(data.data(), prevOutPoint.hash.begin(), 32);
+        memcpy(data.data()+32, &prevOutPoint.n, sizeof(unsigned int));
         filter.insert(data);
     }
     BOOST_CHECK_MESSAGE(filter.IsRelevantAndUpdate(tx), "Simple Bloom filter didn't match manually serialized COutPoint");
@@ -179,20 +180,15 @@ BOOST_AUTO_TEST_CASE(bloom_match)
 
 BOOST_AUTO_TEST_CASE(merkle_block_1)
 {
-    // Random real block (0000000000013b8ab2cd513b0261a14096412195a72a0c4827d229dcc7e0f7af)
-    // With 9 txes
-    CBlock block;
-    CDataStream stream(ParseHex("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"), SER_NETWORK, PROTOCOL_VERSION);
-    stream >> block;
-
+    CBlock block = getBlock13b8a();
     CBloomFilter filter(10, 0.000001, 0, BLOOM_UPDATE_ALL);
     // Match the last transaction
     filter.insert(uint256S("0x74d681e0e03bafa802c8aa084379aa98d9fcd632ddc2ed9782b586ec87451f20"));
 
     CMerkleBlock merkleBlock(block, filter);
-    BOOST_CHECK(merkleBlock.header.GetHash() == block.GetHash());
+    BOOST_CHECK_EQUAL(merkleBlock.header.GetHash().GetHex(), block.GetHash().GetHex());
 
-    BOOST_CHECK(merkleBlock.vMatchedTxn.size() == 1);
+    BOOST_CHECK_EQUAL(merkleBlock.vMatchedTxn.size(), 1);
     std::pair<unsigned int, uint256> pair = merkleBlock.vMatchedTxn[0];
 
     BOOST_CHECK(merkleBlock.vMatchedTxn[0].second == uint256S("0x74d681e0e03bafa802c8aa084379aa98d9fcd632ddc2ed9782b586ec87451f20"));
diff --git a/src/test/checkqueue_tests.cpp b/src/test/checkqueue_tests.cpp
index 6ae0bcadd..c4564b45b 100644
--- a/src/test/checkqueue_tests.cpp
+++ b/src/test/checkqueue_tests.cpp
@@ -38,7 +38,7 @@ struct FakeCheckCheckCompletion {
     static std::atomic<size_t> n_calls;
     bool operator()()
     {
-        ++n_calls;
+        n_calls.fetch_add(1, std::memory_order_relaxed);
         return true;
     }
     void swap(FakeCheckCheckCompletion& x){};
@@ -88,15 +88,15 @@ struct MemoryCheck {
         //
         // Really, copy constructor should be deletable, but CCheckQueue breaks
         // if it is deleted because of internal push_back.
-        fake_allocated_memory += b;
+        fake_allocated_memory.fetch_add(b, std::memory_order_relaxed);
     };
     MemoryCheck(bool b_) : b(b_)
     {
-        fake_allocated_memory += b;
+        fake_allocated_memory.fetch_add(b, std::memory_order_relaxed);
     };
-    ~MemoryCheck(){
-        fake_allocated_memory -= b;
-    
+    ~MemoryCheck()
+    {
+        fake_allocated_memory.fetch_sub(b, std::memory_order_relaxed);
     };
     void swap(MemoryCheck& x) { std::swap(b, x.b); };
 };
@@ -117,9 +117,9 @@ struct FrozenCleanupCheck {
     {
         if (should_freeze) {
             std::unique_lock<std::mutex> l(m);
-            nFrozen = 1;
+            nFrozen.store(1, std::memory_order_relaxed);
             cv.notify_one();
-            cv.wait(l, []{ return nFrozen == 0;});
+            cv.wait(l, []{ return nFrozen.load(std::memory_order_relaxed) == 0;});
         }
     }
     void swap(FrozenCleanupCheck& x){std::swap(should_freeze, x.should_freeze);};
@@ -262,7 +262,7 @@ BOOST_AUTO_TEST_CASE(test_CheckQueue_Recovers_From_Failure)
                 control.Add(vChecks);
             }
             bool r =control.Wait();
-            BOOST_REQUIRE(r || end_fails);
+            BOOST_REQUIRE(r != end_fails);
         }
     }
     tg.interrupt_all();
@@ -337,7 +337,7 @@ BOOST_AUTO_TEST_CASE(test_CheckQueue_Memory)
     tg.join_all();
 }
 
-// Test that a new verification cannot occur until all checks 
+// Test that a new verification cannot occur until all checks
 // have been destructed
 BOOST_AUTO_TEST_CASE(test_CheckQueue_FrozenCleanup)
 {
@@ -361,11 +361,14 @@ BOOST_AUTO_TEST_CASE(test_CheckQueue_FrozenCleanup)
         std::unique_lock<std::mutex> l(FrozenCleanupCheck::m);
         // Wait until the queue has finished all jobs and frozen
         FrozenCleanupCheck::cv.wait(l, [](){return FrozenCleanupCheck::nFrozen == 1;});
-        // Try to get control of the queue a bunch of times
-        for (auto x = 0; x < 100 && !fails; ++x) {
-            fails = queue->ControlMutex.try_lock();
-        }
-        // Unfreeze
+    }
+    // Try to get control of the queue a bunch of times
+    for (auto x = 0; x < 100 && !fails; ++x) {
+        fails = queue->ControlMutex.try_lock();
+    }
+    {
+        // Unfreeze (we need lock n case of spurious wakeup)
+        std::unique_lock<std::mutex> l(FrozenCleanupCheck::m);
         FrozenCleanupCheck::nFrozen = 0;
     }
     // Awaken frozen destructor
diff --git a/src/test/coins_tests.cpp b/src/test/coins_tests.cpp
index e24431528..dc358bff9 100644
--- a/src/test/coins_tests.cpp
+++ b/src/test/coins_tests.cpp
@@ -74,7 +74,7 @@ class CCoinsViewTest : public CCoinsView
 class CCoinsViewCacheTest : public CCoinsViewCache
 {
 public:
-    CCoinsViewCacheTest(CCoinsView* _base) : CCoinsViewCache(_base) {}
+    explicit CCoinsViewCacheTest(CCoinsView* _base) : CCoinsViewCache(_base) {}
 
     void SelfTest() const
     {
@@ -89,8 +89,8 @@ class CCoinsViewCacheTest : public CCoinsViewCache
         BOOST_CHECK_EQUAL(DynamicMemoryUsage(), ret);
     }
 
-    CCoinsMap& map() { return cacheCoins; }
-    size_t& usage() { return cachedCoinsUsage; }
+    CCoinsMap& map() const { return cacheCoins; }
+    size_t& usage() const { return cachedCoinsUsage; }
 };
 
 } // namespace
@@ -275,7 +275,7 @@ UtxoData::iterator FindRandomFrom(const std::set<COutPoint> &utxoSet) {
 // except the emphasis is on testing the functionality of UpdateCoins
 // random txs are created and UpdateCoins is used to update the cache stack
 // In particular it is tested that spending a duplicate coinbase tx
-// has the expected effect (the other duplicate is overwitten at all cache levels)
+// has the expected effect (the other duplicate is overwritten at all cache levels)
 BOOST_AUTO_TEST_CASE(updatecoins_simulation_test)
 {
     bool spent_a_duplicate_coinbase = false;
diff --git a/src/test/crypto_tests.cpp b/src/test/crypto_tests.cpp
index 391ad14ff..c748b2448 100644
--- a/src/test/crypto_tests.cpp
+++ b/src/test/crypto_tests.cpp
@@ -58,12 +58,12 @@ void TestRIPEMD160(const std::string &in, const std::string &hexout) { TestVecto
 
 void TestHMACSHA256(const std::string &hexkey, const std::string &hexin, const std::string &hexout) {
     std::vector<unsigned char> key = ParseHex(hexkey);
-    TestVector(CHMAC_SHA256(&key[0], key.size()), ParseHex(hexin), ParseHex(hexout));
+    TestVector(CHMAC_SHA256(key.data(), key.size()), ParseHex(hexin), ParseHex(hexout));
 }
 
 void TestHMACSHA512(const std::string &hexkey, const std::string &hexin, const std::string &hexout) {
     std::vector<unsigned char> key = ParseHex(hexkey);
-    TestVector(CHMAC_SHA512(&key[0], key.size()), ParseHex(hexin), ParseHex(hexout));
+    TestVector(CHMAC_SHA512(key.data(), key.size()), ParseHex(hexin), ParseHex(hexout));
 }
 
 void TestAES128(const std::string &hexkey, const std::string &hexin, const std::string &hexout)
@@ -76,13 +76,13 @@ void TestAES128(const std::string &hexkey, const std::string &hexin, const std::
     assert(key.size() == 16);
     assert(in.size() == 16);
     assert(correctout.size() == 16);
-    AES128Encrypt enc(&key[0]);
+    AES128Encrypt enc(key.data());
     buf.resize(correctout.size());
     buf2.resize(correctout.size());
-    enc.Encrypt(&buf[0], &in[0]);
+    enc.Encrypt(buf.data(), in.data());
     BOOST_CHECK_EQUAL(HexStr(buf), HexStr(correctout));
-    AES128Decrypt dec(&key[0]);
-    dec.Decrypt(&buf2[0], &buf[0]);
+    AES128Decrypt dec(key.data());
+    dec.Decrypt(buf2.data(), buf.data());
     BOOST_CHECK_EQUAL(HexStr(buf2), HexStr(in));
 }
 
@@ -96,12 +96,12 @@ void TestAES256(const std::string &hexkey, const std::string &hexin, const std::
     assert(key.size() == 32);
     assert(in.size() == 16);
     assert(correctout.size() == 16);
-    AES256Encrypt enc(&key[0]);
+    AES256Encrypt enc(key.data());
     buf.resize(correctout.size());
-    enc.Encrypt(&buf[0], &in[0]);
+    enc.Encrypt(buf.data(), in.data());
     BOOST_CHECK(buf == correctout);
-    AES256Decrypt dec(&key[0]);
-    dec.Decrypt(&buf[0], &buf[0]);
+    AES256Decrypt dec(key.data());
+    dec.Decrypt(buf.data(), buf.data());
     BOOST_CHECK(buf == in);
 }
 
@@ -114,16 +114,16 @@ void TestAES128CBC(const std::string &hexkey, const std::string &hexiv, bool pad
     std::vector<unsigned char> realout(in.size() + AES_BLOCKSIZE);
 
     // Encrypt the plaintext and verify that it equals the cipher
-    AES128CBCEncrypt enc(&key[0], &iv[0], pad);
-    int size = enc.Encrypt(&in[0], in.size(), &realout[0]);
+    AES128CBCEncrypt enc(key.data(), iv.data(), pad);
+    int size = enc.Encrypt(in.data(), in.size(), realout.data());
     realout.resize(size);
     BOOST_CHECK(realout.size() == correctout.size());
     BOOST_CHECK_MESSAGE(realout == correctout, HexStr(realout) + std::string(" != ") + hexout);
 
     // Decrypt the cipher and verify that it equals the plaintext
     std::vector<unsigned char> decrypted(correctout.size());
-    AES128CBCDecrypt dec(&key[0], &iv[0], pad);
-    size = dec.Decrypt(&correctout[0], correctout.size(), &decrypted[0]);
+    AES128CBCDecrypt dec(key.data(), iv.data(), pad);
+    size = dec.Decrypt(correctout.data(), correctout.size(), decrypted.data());
     decrypted.resize(size);
     BOOST_CHECK(decrypted.size() == in.size());
     BOOST_CHECK_MESSAGE(decrypted == in, HexStr(decrypted) + std::string(" != ") + hexin);
@@ -133,12 +133,12 @@ void TestAES128CBC(const std::string &hexkey, const std::string &hexiv, bool pad
     {
         std::vector<unsigned char> sub(i, in.end());
         std::vector<unsigned char> subout(sub.size() + AES_BLOCKSIZE);
-        int _size = enc.Encrypt(&sub[0], sub.size(), &subout[0]);
+        int _size = enc.Encrypt(sub.data(), sub.size(), subout.data());
         if (_size != 0)
         {
             subout.resize(_size);
             std::vector<unsigned char> subdecrypted(subout.size());
-            _size = dec.Decrypt(&subout[0], subout.size(), &subdecrypted[0]);
+            _size = dec.Decrypt(subout.data(), subout.size(), subdecrypted.data());
             subdecrypted.resize(_size);
             BOOST_CHECK(decrypted.size() == in.size());
             BOOST_CHECK_MESSAGE(subdecrypted == sub, HexStr(subdecrypted) + std::string(" != ") + HexStr(sub));
@@ -155,16 +155,16 @@ void TestAES256CBC(const std::string &hexkey, const std::string &hexiv, bool pad
     std::vector<unsigned char> realout(in.size() + AES_BLOCKSIZE);
 
     // Encrypt the plaintext and verify that it equals the cipher
-    AES256CBCEncrypt enc(&key[0], &iv[0], pad);
-    int size = enc.Encrypt(&in[0], in.size(), &realout[0]);
+    AES256CBCEncrypt enc(key.data(), iv.data(), pad);
+    int size = enc.Encrypt(in.data(), in.size(), realout.data());
     realout.resize(size);
     BOOST_CHECK(realout.size() == correctout.size());
     BOOST_CHECK_MESSAGE(realout == correctout, HexStr(realout) + std::string(" != ") + hexout);
 
     // Decrypt the cipher and verify that it equals the plaintext
     std::vector<unsigned char> decrypted(correctout.size());
-    AES256CBCDecrypt dec(&key[0], &iv[0], pad);
-    size = dec.Decrypt(&correctout[0], correctout.size(), &decrypted[0]);
+    AES256CBCDecrypt dec(key.data(), iv.data(), pad);
+    size = dec.Decrypt(correctout.data(), correctout.size(), decrypted.data());
     decrypted.resize(size);
     BOOST_CHECK(decrypted.size() == in.size());
     BOOST_CHECK_MESSAGE(decrypted == in, HexStr(decrypted) + std::string(" != ") + hexin);
@@ -174,12 +174,12 @@ void TestAES256CBC(const std::string &hexkey, const std::string &hexiv, bool pad
     {
         std::vector<unsigned char> sub(i, in.end());
         std::vector<unsigned char> subout(sub.size() + AES_BLOCKSIZE);
-        int _size = enc.Encrypt(&sub[0], sub.size(), &subout[0]);
+        int _size = enc.Encrypt(sub.data(), sub.size(), subout.data());
         if (_size != 0)
         {
             subout.resize(_size);
             std::vector<unsigned char> subdecrypted(subout.size());
-            _size = dec.Decrypt(&subout[0], subout.size(), &subdecrypted[0]);
+            _size = dec.Decrypt(subout.data(), subout.size(), subdecrypted.data());
             subdecrypted.resize(_size);
             BOOST_CHECK(decrypted.size() == in.size());
             BOOST_CHECK_MESSAGE(subdecrypted == sub, HexStr(subdecrypted) + std::string(" != ") + HexStr(sub));
diff --git a/src/test/data/base58_keys_invalid.json b/src/test/data/base58_keys_invalid.json
index a088620f1..2056c7491 100644
--- a/src/test/data/base58_keys_invalid.json
+++ b/src/test/data/base58_keys_invalid.json
@@ -148,5 +148,35 @@
     ], 
     [
         "2A1q1YsMZowabbvta7kTy2Fd6qN4r5ZCeG3qLpvZBMzCixMUdkN2Y4dHB1wPsZAeVXUGD83MfRED"
+    ],
+    [
+        "tc1qw508d6qejxtdg4y5r3zarvary0c5xw7kg3g4ty"
+    ],
+    [
+        "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t5"
+    ],
+    [
+        "BC13W508D6QEJXTDG4Y5R3ZARVARY0C5XW7KN40WF2"
+    ],
+    [
+        "bc1rw5uspcuh"
+    ],
+    [
+        "bc10w508d6qejxtdg4y5r3zarvary0c5xw7kw508d6qejxtdg4y5r3zarvary0c5xw7kw5rljs90"
+    ],
+    [
+        "BC1QR508D6QEJXTDG4Y5R3ZARVARYV98GJ9P"
+    ],
+    [
+        "tb1qrp33g0q5c5txsp9arysrx4k6zdkfs4nce4xj0gdcccefvpysxf3q0sL5k7"
+    ],
+    [
+        "bc1zw508d6qejxtdg4y5r3zarvaryvqyzf3du"
+    ],
+    [
+        "tb1qrp33g0q5c5txsp9arysrx4k6zdkfs4nce4xj0gdcccefvpysxf3pjxtptv"
+    ],
+    [
+        "bc1gmk9yu"
     ]
 ]
diff --git a/src/test/data/base58_keys_valid.json b/src/test/data/base58_keys_valid.json
index e1e252e22..8418a6002 100644
--- a/src/test/data/base58_keys_valid.json
+++ b/src/test/data/base58_keys_valid.json
@@ -1,452 +1,533 @@
 [
     [
-        "1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i", 
-        "65a16059864a2fdbc7c99a4723a8395bc6f188eb", 
+        "1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i",
+        "76a91465a16059864a2fdbc7c99a4723a8395bc6f188eb88ac",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "3CMNFxN1oHBc4R1EpboAL5yzHGgE611Xou", 
-        "74f209f6ea907e2ea48f74fae05782ae8a665257", 
+        "3CMNFxN1oHBc4R1EpboAL5yzHGgE611Xou",
+        "a91474f209f6ea907e2ea48f74fae05782ae8a66525787",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "mo9ncXisMeAoXwqcV5EWuyncbmCcQN4rVs", 
-        "53c0307d6851aa0ce7825ba883c6bd9ad242b486", 
+        "mo9ncXisMeAoXwqcV5EWuyncbmCcQN4rVs",
+        "76a91453c0307d6851aa0ce7825ba883c6bd9ad242b48688ac",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "2N2JD6wb56AfK4tfmM6PwdVmoYk2dCKf4Br", 
-        "6349a418fc4578d10a372b54b45c280cc8c4382f", 
+        "mo9ncXisMeAoXwqcV5EWuyncbmCcQN4rVs",
+        "76a91453c0307d6851aa0ce7825ba883c6bd9ad242b48688ac",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "regtest"
         }
-    ], 
+    ],
     [
-        "5Kd3NBUAdUnhyzenEwVLy9pBKxSwXvE9FMPyR4UKZvpe6E3AgLr", 
-        "eddbdc1168f1daeadbd3e44c1e3f8f5a284c2029f78ad26af98583a499de5b19", 
+        "2N2JD6wb56AfK4tfmM6PwdVmoYk2dCKf4Br",
+        "a9146349a418fc4578d10a372b54b45c280cc8c4382f87",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "Kz6UJmQACJmLtaQj5A3JAge4kVTNQ8gbvXuwbmCj7bsaabudb3RD", 
-        "55c9bccb9ed68446d1b75273bbce89d7fe013a8acd1625514420fb2aca1a21c4", 
+        "5Kd3NBUAdUnhyzenEwVLy9pBKxSwXvE9FMPyR4UKZvpe6E3AgLr",
+        "eddbdc1168f1daeadbd3e44c1e3f8f5a284c2029f78ad26af98583a499de5b19",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "9213qJab2HNEpMpYNBa7wHGFKKbkDn24jpANDs2huN3yi4J11ko", 
-        "36cb93b9ab1bdabf7fb9f2c04f1b9cc879933530ae7842398eef5a63a56800c2", 
+        "Kz6UJmQACJmLtaQj5A3JAge4kVTNQ8gbvXuwbmCj7bsaabudb3RD",
+        "55c9bccb9ed68446d1b75273bbce89d7fe013a8acd1625514420fb2aca1a21c4",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "cTpB4YiyKiBcPxnefsDpbnDxFDffjqJob8wGCEDXxgQ7zQoMXJdH", 
-        "b9f4892c9e8282028fea1d2667c4dc5213564d41fc5783896a0d843fc15089f3", 
+        "9213qJab2HNEpMpYNBa7wHGFKKbkDn24jpANDs2huN3yi4J11ko",
+        "36cb93b9ab1bdabf7fb9f2c04f1b9cc879933530ae7842398eef5a63a56800c2",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "1Ax4gZtb7gAit2TivwejZHYtNNLT18PUXJ", 
-        "6d23156cbbdcc82a5a47eee4c2c7c583c18b6bf4", 
+        "9213qJab2HNEpMpYNBa7wHGFKKbkDn24jpANDs2huN3yi4J11ko",
+        "36cb93b9ab1bdabf7fb9f2c04f1b9cc879933530ae7842398eef5a63a56800c2",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "regtest"
         }
-    ], 
+    ],
     [
-        "3QjYXhTkvuj8qPaXHTTWb5wjXhdsLAAWVy", 
-        "fcc5460dd6e2487c7d75b1963625da0e8f4c5975", 
+        "cTpB4YiyKiBcPxnefsDpbnDxFDffjqJob8wGCEDXxgQ7zQoMXJdH",
+        "b9f4892c9e8282028fea1d2667c4dc5213564d41fc5783896a0d843fc15089f3",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "n3ZddxzLvAY9o7184TB4c6FJasAybsw4HZ", 
-        "f1d470f9b02370fdec2e6b708b08ac431bf7a5f7", 
+        "cTpB4YiyKiBcPxnefsDpbnDxFDffjqJob8wGCEDXxgQ7zQoMXJdH",
+        "b9f4892c9e8282028fea1d2667c4dc5213564d41fc5783896a0d843fc15089f3",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "regtest"
         }
-    ], 
+    ],
     [
-        "2NBFNJTktNa7GZusGbDbGKRZTxdK9VVez3n", 
-        "c579342c2c4c9220205e2cdc285617040c924a0a", 
+        "1Ax4gZtb7gAit2TivwejZHYtNNLT18PUXJ",
+        "76a9146d23156cbbdcc82a5a47eee4c2c7c583c18b6bf488ac",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "5K494XZwps2bGyeL71pWid4noiSNA2cfCibrvRWqcHSptoFn7rc", 
-        "a326b95ebae30164217d7a7f57d72ab2b54e3be64928a19da0210b9568d4015e", 
+        "3QjYXhTkvuj8qPaXHTTWb5wjXhdsLAAWVy",
+        "a914fcc5460dd6e2487c7d75b1963625da0e8f4c597587",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "L1RrrnXkcKut5DEMwtDthjwRcTTwED36thyL1DebVrKuwvohjMNi", 
-        "7d998b45c219a1e38e99e7cbd312ef67f77a455a9b50c730c27f02c6f730dfb4", 
+        "n3ZddxzLvAY9o7184TB4c6FJasAybsw4HZ",
+        "76a914f1d470f9b02370fdec2e6b708b08ac431bf7a5f788ac",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "93DVKyFYwSN6wEo3E2fCrFPUp17FtrtNi2Lf7n4G3garFb16CRj", 
-        "d6bca256b5abc5602ec2e1c121a08b0da2556587430bcf7e1898af2224885203", 
+        "2NBFNJTktNa7GZusGbDbGKRZTxdK9VVez3n",
+        "a914c579342c2c4c9220205e2cdc285617040c924a0a87",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "cTDVKtMGVYWTHCb1AFjmVbEbWjvKpKqKgMaR3QJxToMSQAhmCeTN", 
-        "a81ca4e8f90181ec4b61b6a7eb998af17b2cb04de8a03b504b9e34c4c61db7d9", 
+        "5K494XZwps2bGyeL71pWid4noiSNA2cfCibrvRWqcHSptoFn7rc",
+        "a326b95ebae30164217d7a7f57d72ab2b54e3be64928a19da0210b9568d4015e",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "1C5bSj1iEGUgSTbziymG7Cn18ENQuT36vv", 
-        "7987ccaa53d02c8873487ef919677cd3db7a6912", 
+        "L1RrrnXkcKut5DEMwtDthjwRcTTwED36thyL1DebVrKuwvohjMNi",
+        "7d998b45c219a1e38e99e7cbd312ef67f77a455a9b50c730c27f02c6f730dfb4",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "3AnNxabYGoTxYiTEZwFEnerUoeFXK2Zoks", 
-        "63bcc565f9e68ee0189dd5cc67f1b0e5f02f45cb", 
+        "93DVKyFYwSN6wEo3E2fCrFPUp17FtrtNi2Lf7n4G3garFb16CRj",
+        "d6bca256b5abc5602ec2e1c121a08b0da2556587430bcf7e1898af2224885203",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "n3LnJXCqbPjghuVs8ph9CYsAe4Sh4j97wk", 
-        "ef66444b5b17f14e8fae6e7e19b045a78c54fd79", 
+        "cTDVKtMGVYWTHCb1AFjmVbEbWjvKpKqKgMaR3QJxToMSQAhmCeTN",
+        "a81ca4e8f90181ec4b61b6a7eb998af17b2cb04de8a03b504b9e34c4c61db7d9",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "2NB72XtkjpnATMggui83aEtPawyyKvnbX2o", 
-        "c3e55fceceaa4391ed2a9677f4a4d34eacd021a0", 
+        "1C5bSj1iEGUgSTbziymG7Cn18ENQuT36vv",
+        "76a9147987ccaa53d02c8873487ef919677cd3db7a691288ac",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "5KaBW9vNtWNhc3ZEDyNCiXLPdVPHCikRxSBWwV9NrpLLa4LsXi9", 
-        "e75d936d56377f432f404aabb406601f892fd49da90eb6ac558a733c93b47252", 
+        "3AnNxabYGoTxYiTEZwFEnerUoeFXK2Zoks",
+        "a91463bcc565f9e68ee0189dd5cc67f1b0e5f02f45cb87",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "L1axzbSyynNYA8mCAhzxkipKkfHtAXYF4YQnhSKcLV8YXA874fgT", 
-        "8248bd0375f2f75d7e274ae544fb920f51784480866b102384190b1addfbaa5c", 
+        "n3LnJXCqbPjghuVs8ph9CYsAe4Sh4j97wk",
+        "76a914ef66444b5b17f14e8fae6e7e19b045a78c54fd7988ac",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "927CnUkUbasYtDwYwVn2j8GdTuACNnKkjZ1rpZd2yBB1CLcnXpo", 
-        "44c4f6a096eac5238291a94cc24c01e3b19b8d8cef72874a079e00a242237a52", 
+        "2NB72XtkjpnATMggui83aEtPawyyKvnbX2o",
+        "a914c3e55fceceaa4391ed2a9677f4a4d34eacd021a087",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "cUcfCMRjiQf85YMzzQEk9d1s5A4K7xL5SmBCLrezqXFuTVefyhY7", 
-        "d1de707020a9059d6d3abaf85e17967c6555151143db13dbb06db78df0f15c69", 
+        "5KaBW9vNtWNhc3ZEDyNCiXLPdVPHCikRxSBWwV9NrpLLa4LsXi9",
+        "e75d936d56377f432f404aabb406601f892fd49da90eb6ac558a733c93b47252",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "1Gqk4Tv79P91Cc1STQtU3s1W6277M2CVWu", 
-        "adc1cc2081a27206fae25792f28bbc55b831549d", 
+        "L1axzbSyynNYA8mCAhzxkipKkfHtAXYF4YQnhSKcLV8YXA874fgT",
+        "8248bd0375f2f75d7e274ae544fb920f51784480866b102384190b1addfbaa5c",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "33vt8ViH5jsr115AGkW6cEmEz9MpvJSwDk", 
-        "188f91a931947eddd7432d6e614387e32b244709", 
+        "927CnUkUbasYtDwYwVn2j8GdTuACNnKkjZ1rpZd2yBB1CLcnXpo",
+        "44c4f6a096eac5238291a94cc24c01e3b19b8d8cef72874a079e00a242237a52",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "mhaMcBxNh5cqXm4aTQ6EcVbKtfL6LGyK2H", 
-        "1694f5bc1a7295b600f40018a618a6ea48eeb498", 
+        "cUcfCMRjiQf85YMzzQEk9d1s5A4K7xL5SmBCLrezqXFuTVefyhY7",
+        "d1de707020a9059d6d3abaf85e17967c6555151143db13dbb06db78df0f15c69",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "2MxgPqX1iThW3oZVk9KoFcE5M4JpiETssVN", 
-        "3b9b3fd7a50d4f08d1a5b0f62f644fa7115ae2f3", 
+        "1Gqk4Tv79P91Cc1STQtU3s1W6277M2CVWu",
+        "76a914adc1cc2081a27206fae25792f28bbc55b831549d88ac",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "5HtH6GdcwCJA4ggWEL1B3jzBBUB8HPiBi9SBc5h9i4Wk4PSeApR", 
-        "091035445ef105fa1bb125eccfb1882f3fe69592265956ade751fd095033d8d0", 
+        "33vt8ViH5jsr115AGkW6cEmEz9MpvJSwDk",
+        "a914188f91a931947eddd7432d6e614387e32b24470987",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "L2xSYmMeVo3Zek3ZTsv9xUrXVAmrWxJ8Ua4cw8pkfbQhcEFhkXT8", 
-        "ab2b4bcdfc91d34dee0ae2a8c6b6668dadaeb3a88b9859743156f462325187af", 
+        "mhaMcBxNh5cqXm4aTQ6EcVbKtfL6LGyK2H",
+        "76a9141694f5bc1a7295b600f40018a618a6ea48eeb49888ac",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "92xFEve1Z9N8Z641KQQS7ByCSb8kGjsDzw6fAmjHN1LZGKQXyMq", 
-        "b4204389cef18bbe2b353623cbf93e8678fbc92a475b664ae98ed594e6cf0856", 
+        "2MxgPqX1iThW3oZVk9KoFcE5M4JpiETssVN",
+        "a9143b9b3fd7a50d4f08d1a5b0f62f644fa7115ae2f387",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "cVM65tdYu1YK37tNoAyGoJTR13VBYFva1vg9FLuPAsJijGvG6NEA", 
-        "e7b230133f1b5489843260236b06edca25f66adb1be455fbd38d4010d48faeef", 
+        "5HtH6GdcwCJA4ggWEL1B3jzBBUB8HPiBi9SBc5h9i4Wk4PSeApR",
+        "091035445ef105fa1bb125eccfb1882f3fe69592265956ade751fd095033d8d0",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "1JwMWBVLtiqtscbaRHai4pqHokhFCbtoB4", 
-        "c4c1b72491ede1eedaca00618407ee0b772cad0d", 
+        "L2xSYmMeVo3Zek3ZTsv9xUrXVAmrWxJ8Ua4cw8pkfbQhcEFhkXT8",
+        "ab2b4bcdfc91d34dee0ae2a8c6b6668dadaeb3a88b9859743156f462325187af",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "3QCzvfL4ZRvmJFiWWBVwxfdaNBT8EtxB5y", 
-        "f6fe69bcb548a829cce4c57bf6fff8af3a5981f9", 
+        "92xFEve1Z9N8Z641KQQS7ByCSb8kGjsDzw6fAmjHN1LZGKQXyMq",
+        "b4204389cef18bbe2b353623cbf93e8678fbc92a475b664ae98ed594e6cf0856",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "mizXiucXRCsEriQCHUkCqef9ph9qtPbZZ6", 
-        "261f83568a098a8638844bd7aeca039d5f2352c0", 
+        "92xFEve1Z9N8Z641KQQS7ByCSb8kGjsDzw6fAmjHN1LZGKQXyMq",
+        "b4204389cef18bbe2b353623cbf93e8678fbc92a475b664ae98ed594e6cf0856",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "regtest"
         }
-    ], 
+    ],
     [
-        "2NEWDzHWwY5ZZp8CQWbB7ouNMLqCia6YRda", 
-        "e930e1834a4d234702773951d627cce82fbb5d2e", 
+        "cVM65tdYu1YK37tNoAyGoJTR13VBYFva1vg9FLuPAsJijGvG6NEA",
+        "e7b230133f1b5489843260236b06edca25f66adb1be455fbd38d4010d48faeef",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "5KQmDryMNDcisTzRp3zEq9e4awRmJrEVU1j5vFRTKpRNYPqYrMg", 
-        "d1fab7ab7385ad26872237f1eb9789aa25cc986bacc695e07ac571d6cdac8bc0", 
+        "1JwMWBVLtiqtscbaRHai4pqHokhFCbtoB4",
+        "76a914c4c1b72491ede1eedaca00618407ee0b772cad0d88ac",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "L39Fy7AC2Hhj95gh3Yb2AU5YHh1mQSAHgpNixvm27poizcJyLtUi", 
-        "b0bbede33ef254e8376aceb1510253fc3550efd0fcf84dcd0c9998b288f166b3", 
+        "3QCzvfL4ZRvmJFiWWBVwxfdaNBT8EtxB5y",
+        "a914f6fe69bcb548a829cce4c57bf6fff8af3a5981f987",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "91cTVUcgydqyZLgaANpf1fvL55FH53QMm4BsnCADVNYuWuqdVys", 
-        "037f4192c630f399d9271e26c575269b1d15be553ea1a7217f0cb8513cef41cb", 
+        "mizXiucXRCsEriQCHUkCqef9ph9qtPbZZ6",
+        "76a914261f83568a098a8638844bd7aeca039d5f2352c088ac",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "cQspfSzsgLeiJGB2u8vrAiWpCU4MxUT6JseWo2SjXy4Qbzn2fwDw", 
-        "6251e205e8ad508bab5596bee086ef16cd4b239e0cc0c5d7c4e6035441e7d5de", 
+        "2NEWDzHWwY5ZZp8CQWbB7ouNMLqCia6YRda",
+        "a914e930e1834a4d234702773951d627cce82fbb5d2e87",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "19dcawoKcZdQz365WpXWMhX6QCUpR9SY4r", 
-        "5eadaf9bb7121f0f192561a5a62f5e5f54210292", 
+        "5KQmDryMNDcisTzRp3zEq9e4awRmJrEVU1j5vFRTKpRNYPqYrMg",
+        "d1fab7ab7385ad26872237f1eb9789aa25cc986bacc695e07ac571d6cdac8bc0",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "37Sp6Rv3y4kVd1nQ1JV5pfqXccHNyZm1x3", 
-        "3f210e7277c899c3a155cc1c90f4106cbddeec6e", 
+        "L39Fy7AC2Hhj95gh3Yb2AU5YHh1mQSAHgpNixvm27poizcJyLtUi",
+        "b0bbede33ef254e8376aceb1510253fc3550efd0fcf84dcd0c9998b288f166b3",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "myoqcgYiehufrsnnkqdqbp69dddVDMopJu", 
-        "c8a3c2a09a298592c3e180f02487cd91ba3400b5", 
+        "91cTVUcgydqyZLgaANpf1fvL55FH53QMm4BsnCADVNYuWuqdVys",
+        "037f4192c630f399d9271e26c575269b1d15be553ea1a7217f0cb8513cef41cb",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "2N7FuwuUuoTBrDFdrAZ9KxBmtqMLxce9i1C", 
-        "99b31df7c9068d1481b596578ddbb4d3bd90baeb", 
+        "cQspfSzsgLeiJGB2u8vrAiWpCU4MxUT6JseWo2SjXy4Qbzn2fwDw",
+        "6251e205e8ad508bab5596bee086ef16cd4b239e0cc0c5d7c4e6035441e7d5de",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": true
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "5KL6zEaMtPRXZKo1bbMq7JDjjo1bJuQcsgL33je3oY8uSJCR5b4", 
-        "c7666842503db6dc6ea061f092cfb9c388448629a6fe868d068c42a488b478ae", 
+        "19dcawoKcZdQz365WpXWMhX6QCUpR9SY4r",
+        "76a9145eadaf9bb7121f0f192561a5a62f5e5f5421029288ac",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "KwV9KAfwbwt51veZWNscRTeZs9CKpojyu1MsPnaKTF5kz69H1UN2", 
-        "07f0803fc5399e773555ab1e8939907e9badacc17ca129e67a2f5f2ff84351dd", 
+        "37Sp6Rv3y4kVd1nQ1JV5pfqXccHNyZm1x3",
+        "a9143f210e7277c899c3a155cc1c90f4106cbddeec6e87",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": false
+            "isPrivkey": false,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "93N87D6uxSBzwXvpokpzg8FFmfQPmvX4xHoWQe3pLdYpbiwT5YV", 
-        "ea577acfb5d1d14d3b7b195c321566f12f87d2b77ea3a53f68df7ebf8604a801", 
+        "myoqcgYiehufrsnnkqdqbp69dddVDMopJu",
+        "76a914c8a3c2a09a298592c3e180f02487cd91ba3400b588ac",
         {
-            "isCompressed": false, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "cMxXusSihaX58wpJ3tNuuUcZEQGt6DKJ1wEpxys88FFaQCYjku9h", 
-        "0b3b34f0958d8a268193a9814da92c3e8b58b4a4378a542863e34ac289cd830c", 
+        "2N7FuwuUuoTBrDFdrAZ9KxBmtqMLxce9i1C",
+        "a91499b31df7c9068d1481b596578ddbb4d3bd90baeb87",
         {
-            "isCompressed": true, 
-            "isPrivkey": true, 
-            "isTestnet": true
+            "isPrivkey": false,
+            "chain": "test"
         }
-    ], 
+    ],
     [
-        "13p1ijLwsnrcuyqcTvJXkq2ASdXqcnEBLE", 
-        "1ed467017f043e91ed4c44b4e8dd674db211c4e6", 
+        "5KL6zEaMtPRXZKo1bbMq7JDjjo1bJuQcsgL33je3oY8uSJCR5b4",
+        "c7666842503db6dc6ea061f092cfb9c388448629a6fe868d068c42a488b478ae",
         {
-            "addrType": "pubkey", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "main"
         }
-    ], 
+    ],
     [
-        "3ALJH9Y951VCGcVZYAdpA3KchoP9McEj1G", 
-        "5ece0cadddc415b1980f001785947120acdb36fc", 
+        "KwV9KAfwbwt51veZWNscRTeZs9CKpojyu1MsPnaKTF5kz69H1UN2",
+        "07f0803fc5399e773555ab1e8939907e9badacc17ca129e67a2f5f2ff84351dd",
         {
-            "addrType": "script", 
-            "isPrivkey": false, 
-            "isTestnet": false
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "main"
+        }
+    ],
+    [
+        "93N87D6uxSBzwXvpokpzg8FFmfQPmvX4xHoWQe3pLdYpbiwT5YV",
+        "ea577acfb5d1d14d3b7b195c321566f12f87d2b77ea3a53f68df7ebf8604a801",
+        {
+            "isCompressed": false,
+            "isPrivkey": true,
+            "chain": "test"
+        }
+    ],
+    [
+        "cMxXusSihaX58wpJ3tNuuUcZEQGt6DKJ1wEpxys88FFaQCYjku9h",
+        "0b3b34f0958d8a268193a9814da92c3e8b58b4a4378a542863e34ac289cd830c",
+        {
+            "isCompressed": true,
+            "isPrivkey": true,
+            "chain": "test"
+        }
+    ],
+    [
+        "13p1ijLwsnrcuyqcTvJXkq2ASdXqcnEBLE",
+        "76a9141ed467017f043e91ed4c44b4e8dd674db211c4e688ac",
+        {
+            "isPrivkey": false,
+            "chain": "main"
+        }
+    ],
+    [
+        "3ALJH9Y951VCGcVZYAdpA3KchoP9McEj1G",
+        "a9145ece0cadddc415b1980f001785947120acdb36fc87",
+        {
+            "isPrivkey": false,
+            "chain": "main"
+        }
+    ],
+    [
+        "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4",
+        "0014751e76e8199196d454941c45d1b3a323f1433bd6",
+        {
+            "isPrivkey": false,
+            "chain": "main",
+            "tryCaseFlip": true
+        }
+    ],
+    [
+        "bcrt1qw508d6qejxtdg4y5r3zarvary0c5xw7kygt080",
+        "0014751e76e8199196d454941c45d1b3a323f1433bd6",
+        {
+            "isPrivkey": false,
+            "chain": "regtest",
+            "tryCaseFlip": true
+        }
+    ],
+    [
+        "tb1qrp33g0q5c5txsp9arysrx4k6zdkfs4nce4xj0gdcccefvpysxf3q0sl5k7",
+        "00201863143c14c5166804bd19203356da136c985678cd4d27a1b8c6329604903262",
+        {
+            "isPrivkey": false,
+            "chain": "test",
+            "tryCaseFlip": true
+        }
+    ],
+    [
+        "bc1pw508d6qejxtdg4y5r3zarvary0c5xw7kw508d6qejxtdg4y5r3zarvary0c5xw7k7grplx",
+        "5128751e76e8199196d454941c45d1b3a323f1433bd6751e76e8199196d454941c45d1b3a323f1433bd6",
+        {
+            "isPrivkey": false,
+            "chain": "main",
+            "tryCaseFlip": true
+        }
+    ],
+    [
+        "bc1sw50qa3jx3s",
+        "6002751e",
+        {
+            "isPrivkey": false,
+            "chain": "main",
+            "tryCaseFlip": true
+        }
+    ],
+    [
+        "bc1zw508d6qejxtdg4y5r3zarvaryvg6kdaj",
+        "5210751e76e8199196d454941c45d1b3a323",
+        {
+            "isPrivkey": false,
+            "chain": "main",
+            "tryCaseFlip": true
+        }
+    ],
+    [
+        "tb1qqqqqp399et2xygdj5xreqhjjvcmzhxw4aywxecjdzew6hylgvsesrxh6hy",
+        "0020000000c4a5cad46221b2a187905e5266362b99d5e91c6ce24d165dab93e86433",
+        {
+            "isPrivkey": false,
+            "chain": "test",
+            "tryCaseFlip": true
+        }
+    ],
+    [
+        "bcrt1qqqqqp399et2xygdj5xreqhjjvcmzhxw4aywxecjdzew6hylgvseswlauz7",
+        "0020000000c4a5cad46221b2a187905e5266362b99d5e91c6ce24d165dab93e86433",
+        {
+            "isPrivkey": false,
+            "chain": "regtest",
+            "tryCaseFlip": true
         }
     ]
 ]
diff --git a/src/test/data/tx_invalid.json b/src/test/data/tx_invalid.json
index 2235bd0ae..09442b7f9 100644
--- a/src/test/data/tx_invalid.json
+++ b/src/test/data/tx_invalid.json
@@ -205,7 +205,7 @@
 [[["0000000000000000000000000000000000000000000000000000000000000100", 0, "4259839 CHECKSEQUENCEVERIFY 1"]],
 "020000000100010000000000000000000000000000000000000000000000000000000000000000000000feff40000100000000000000000000000000", "P2SH,CHECKSEQUENCEVERIFY"],
 
-["By-time locks, with argument just beyond txin.nSequence (but within numerical boundries)"],
+["By-time locks, with argument just beyond txin.nSequence (but within numerical boundaries)"],
 [[["0000000000000000000000000000000000000000000000000000000000000100", 0, "4194305 CHECKSEQUENCEVERIFY 1"]],
 "020000000100010000000000000000000000000000000000000000000000000000000000000000000000000040000100000000000000000000000000", "P2SH,CHECKSEQUENCEVERIFY"],
 [[["0000000000000000000000000000000000000000000000000000000000000100", 0, "4259839 CHECKSEQUENCEVERIFY 1"]],
diff --git a/src/test/data/tx_valid.json b/src/test/data/tx_valid.json
index e6b382af1..ad74b7cf1 100644
--- a/src/test/data/tx_valid.json
+++ b/src/test/data/tx_valid.json
@@ -45,7 +45,7 @@
 "01000000010001000000000000000000000000000000000000000000000000000000000000000000006a473044022067288ea50aa799543a536ff9306f8e1cba05b9c6b10951175b924f96732555ed022026d7b5265f38d21541519e4a1e55044d5b9e17e15cdbaf29ae3792e99e883e7a012103ba8c8b86dea131c22ab967e6dd99bdae8eff7a1f75a2c35f1f944109e3fe5e22ffffffff010000000000000000015100000000", "P2SH"],
 
 ["The following is f7fdd091fa6d8f5e7a8c2458f5c38faffff2d3f1406b6e4fe2c99dcc0d2d1cbb"],
-["It caught a bug in the workaround for 23b397edccd3740a74adb603c9756370fafcde9bcc4483eb271ecad09a94dd63 in an overly simple implementation"],
+["It caught a bug in the workaround for 23b397edccd3740a74adb603c9756370fafcde9bcc4483eb271ecad09a94dd63 in an overly simple implementation. In a signature, it contains an ASN1 integer which isn't strict-DER conformant due to being negative, which doesn't make sense in a signature. Before BIP66 activated, it was a valid signature. After it activated, it's not valid any more."],
 [[["b464e85df2a238416f8bdae11d120add610380ea07f4ef19c5f9dfd472f96c3d", 0, "DUP HASH160 0x14 0xbef80ecf3a44500fda1bc92176e442891662aed2 EQUALVERIFY CHECKSIG"],
 ["b7978cc96e59a8b13e0865d3f95657561a7f725be952438637475920bac9eb21", 1, "DUP HASH160 0x14 0xbef80ecf3a44500fda1bc92176e442891662aed2 EQUALVERIFY CHECKSIG"]],
 "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", "P2SH"],
diff --git a/src/test/dbwrapper_tests.cpp b/src/test/dbwrapper_tests.cpp
index 6ed6e7744..efddafe17 100644
--- a/src/test/dbwrapper_tests.cpp
+++ b/src/test/dbwrapper_tests.cpp
@@ -204,19 +204,31 @@ BOOST_AUTO_TEST_CASE(iterator_ordering)
     for (int x=0x00; x<256; ++x) {
         uint8_t key = x;
         uint32_t value = x*x;
-        BOOST_CHECK(dbw.Write(key, value));
+        if (!(x & 1)) BOOST_CHECK(dbw.Write(key, value));
     }
 
+    // Check that creating an iterator creates a snapshot
     std::unique_ptr<CDBIterator> it(const_cast<CDBWrapper&>(dbw).NewIterator());
+
+    for (int x=0x00; x<256; ++x) {
+        uint8_t key = x;
+        uint32_t value = x*x;
+        if (x & 1) BOOST_CHECK(dbw.Write(key, value));
+    }
+
     for (int seek_start : {0x00, 0x80}) {
         it->Seek((uint8_t)seek_start);
-        for (int x=seek_start; x<256; ++x) {
+        for (int x=seek_start; x<255; ++x) {
             uint8_t key;
             uint32_t value;
             BOOST_CHECK(it->Valid());
             if (!it->Valid()) // Avoid spurious errors about invalid iterator's key and value in case of failure
                 break;
             BOOST_CHECK(it->GetKey(key));
+            if (x & 1) {
+                BOOST_CHECK_EQUAL(key, x + 1);
+                continue;
+            }
             BOOST_CHECK(it->GetValue(value));
             BOOST_CHECK_EQUAL(key, x);
             BOOST_CHECK_EQUAL(value, x*x);
@@ -231,7 +243,7 @@ struct StringContentsSerializer {
     // This is a terrible idea
     std::string str;
     StringContentsSerializer() {}
-    StringContentsSerializer(const std::string& inp) : str(inp) {}
+    explicit StringContentsSerializer(const std::string& inp) : str(inp) {}
 
     StringContentsSerializer& operator+=(const std::string& s) {
         str += s;
diff --git a/src/test/getarg_tests.cpp b/src/test/getarg_tests.cpp
index c79675f5a..40f0ecd5f 100644
--- a/src/test/getarg_tests.cpp
+++ b/src/test/getarg_tests.cpp
@@ -27,135 +27,135 @@ static void ResetArgs(const std::string& strArg)
     for (std::string& s : vecArg)
         vecChar.push_back(s.c_str());
 
-    ParseParameters(vecChar.size(), &vecChar[0]);
+    gArgs.ParseParameters(vecChar.size(), vecChar.data());
 }
 
 BOOST_AUTO_TEST_CASE(boolarg)
 {
     ResetArgs("-foo");
-    BOOST_CHECK(GetBoolArg("-foo", false));
-    BOOST_CHECK(GetBoolArg("-foo", true));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", false));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", true));
 
-    BOOST_CHECK(!GetBoolArg("-fo", false));
-    BOOST_CHECK(GetBoolArg("-fo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-fo", false));
+    BOOST_CHECK(gArgs.GetBoolArg("-fo", true));
 
-    BOOST_CHECK(!GetBoolArg("-fooo", false));
-    BOOST_CHECK(GetBoolArg("-fooo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-fooo", false));
+    BOOST_CHECK(gArgs.GetBoolArg("-fooo", true));
 
     ResetArgs("-foo=0");
-    BOOST_CHECK(!GetBoolArg("-foo", false));
-    BOOST_CHECK(!GetBoolArg("-foo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", false));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", true));
 
     ResetArgs("-foo=1");
-    BOOST_CHECK(GetBoolArg("-foo", false));
-    BOOST_CHECK(GetBoolArg("-foo", true));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", false));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", true));
 
     // New 0.6 feature: auto-map -nosomething to !-something:
     ResetArgs("-nofoo");
-    BOOST_CHECK(!GetBoolArg("-foo", false));
-    BOOST_CHECK(!GetBoolArg("-foo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", false));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", true));
 
     ResetArgs("-nofoo=1");
-    BOOST_CHECK(!GetBoolArg("-foo", false));
-    BOOST_CHECK(!GetBoolArg("-foo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", false));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", true));
 
     ResetArgs("-foo -nofoo");  // -nofoo should win
-    BOOST_CHECK(!GetBoolArg("-foo", false));
-    BOOST_CHECK(!GetBoolArg("-foo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", false));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", true));
 
     ResetArgs("-foo=1 -nofoo=1");  // -nofoo should win
-    BOOST_CHECK(!GetBoolArg("-foo", false));
-    BOOST_CHECK(!GetBoolArg("-foo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", false));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", true));
 
     ResetArgs("-foo=0 -nofoo=0");  // -nofoo=0 should win
-    BOOST_CHECK(GetBoolArg("-foo", false));
-    BOOST_CHECK(GetBoolArg("-foo", true));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", false));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", true));
 
     // New 0.6 feature: treat -- same as -:
     ResetArgs("--foo=1");
-    BOOST_CHECK(GetBoolArg("-foo", false));
-    BOOST_CHECK(GetBoolArg("-foo", true));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", false));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", true));
 
     ResetArgs("--nofoo=1");
-    BOOST_CHECK(!GetBoolArg("-foo", false));
-    BOOST_CHECK(!GetBoolArg("-foo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", false));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", true));
 
 }
 
 BOOST_AUTO_TEST_CASE(stringarg)
 {
     ResetArgs("");
-    BOOST_CHECK_EQUAL(GetArg("-foo", ""), "");
-    BOOST_CHECK_EQUAL(GetArg("-foo", "eleven"), "eleven");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", ""), "");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", "eleven"), "eleven");
 
     ResetArgs("-foo -bar");
-    BOOST_CHECK_EQUAL(GetArg("-foo", ""), "");
-    BOOST_CHECK_EQUAL(GetArg("-foo", "eleven"), "");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", ""), "");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", "eleven"), "");
 
     ResetArgs("-foo=");
-    BOOST_CHECK_EQUAL(GetArg("-foo", ""), "");
-    BOOST_CHECK_EQUAL(GetArg("-foo", "eleven"), "");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", ""), "");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", "eleven"), "");
 
     ResetArgs("-foo=11");
-    BOOST_CHECK_EQUAL(GetArg("-foo", ""), "11");
-    BOOST_CHECK_EQUAL(GetArg("-foo", "eleven"), "11");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", ""), "11");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", "eleven"), "11");
 
     ResetArgs("-foo=eleven");
-    BOOST_CHECK_EQUAL(GetArg("-foo", ""), "eleven");
-    BOOST_CHECK_EQUAL(GetArg("-foo", "eleven"), "eleven");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", ""), "eleven");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", "eleven"), "eleven");
 
 }
 
 BOOST_AUTO_TEST_CASE(intarg)
 {
     ResetArgs("");
-    BOOST_CHECK_EQUAL(GetArg("-foo", 11), 11);
-    BOOST_CHECK_EQUAL(GetArg("-foo", 0), 0);
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", 11), 11);
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", 0), 0);
 
     ResetArgs("-foo -bar");
-    BOOST_CHECK_EQUAL(GetArg("-foo", 11), 0);
-    BOOST_CHECK_EQUAL(GetArg("-bar", 11), 0);
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", 11), 0);
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-bar", 11), 0);
 
     ResetArgs("-foo=11 -bar=12");
-    BOOST_CHECK_EQUAL(GetArg("-foo", 0), 11);
-    BOOST_CHECK_EQUAL(GetArg("-bar", 11), 12);
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", 0), 11);
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-bar", 11), 12);
 
     ResetArgs("-foo=NaN -bar=NotANumber");
-    BOOST_CHECK_EQUAL(GetArg("-foo", 1), 0);
-    BOOST_CHECK_EQUAL(GetArg("-bar", 11), 0);
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", 1), 0);
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-bar", 11), 0);
 }
 
 BOOST_AUTO_TEST_CASE(doubledash)
 {
     ResetArgs("--foo");
-    BOOST_CHECK_EQUAL(GetBoolArg("-foo", false), true);
+    BOOST_CHECK_EQUAL(gArgs.GetBoolArg("-foo", false), true);
 
     ResetArgs("--foo=verbose --bar=1");
-    BOOST_CHECK_EQUAL(GetArg("-foo", ""), "verbose");
-    BOOST_CHECK_EQUAL(GetArg("-bar", 0), 1);
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-foo", ""), "verbose");
+    BOOST_CHECK_EQUAL(gArgs.GetArg("-bar", 0), 1);
 }
 
 BOOST_AUTO_TEST_CASE(boolargno)
 {
     ResetArgs("-nofoo");
-    BOOST_CHECK(!GetBoolArg("-foo", true));
-    BOOST_CHECK(!GetBoolArg("-foo", false));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", false));
 
     ResetArgs("-nofoo=1");
-    BOOST_CHECK(!GetBoolArg("-foo", true));
-    BOOST_CHECK(!GetBoolArg("-foo", false));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", false));
 
     ResetArgs("-nofoo=0");
-    BOOST_CHECK(GetBoolArg("-foo", true));
-    BOOST_CHECK(GetBoolArg("-foo", false));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", true));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", false));
 
     ResetArgs("-foo --nofoo"); // --nofoo should win
-    BOOST_CHECK(!GetBoolArg("-foo", true));
-    BOOST_CHECK(!GetBoolArg("-foo", false));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", true));
+    BOOST_CHECK(!gArgs.GetBoolArg("-foo", false));
 
     ResetArgs("-nofoo -foo"); // foo always wins:
-    BOOST_CHECK(GetBoolArg("-foo", true));
-    BOOST_CHECK(GetBoolArg("-foo", false));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", true));
+    BOOST_CHECK(gArgs.GetBoolArg("-foo", false));
 }
 
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/key_tests.cpp b/src/test/key_tests.cpp
index 559b3caf1..91c017541 100644
--- a/src/test/key_tests.cpp
+++ b/src/test/key_tests.cpp
@@ -16,17 +16,16 @@
 
 #include <boost/test/unit_test.hpp>
 
-static const std::string strSecret1     ("5HxWvvfubhXpYYpS3tJkw6fq9jE9j18THftkZjHHfmFiWtmAbrj");
-static const std::string strSecret2     ("5KC4ejrDjv152FGwP386VD1i2NYc5KkfSMyv1nGy1VGDxGHqVY3");
-static const std::string strSecret1C    ("Kwr371tjA9u2rFSMZjTNun2PXXP3WPZu2afRHTcta6KxEUdm1vEw");
-static const std::string strSecret2C    ("L3Hq7a8FEQwJkW1M2GNKDW28546Vp5miewcCzSqUD9kCAXrJdS3g");
-static const CBitcoinAddress addr1 ("1QFqqMUD55ZV3PJEJZtaKCsQmjLT6JkjvJ");
-static const CBitcoinAddress addr2 ("1F5y5E5FMc5YzdJtB9hLaUe43GDxEKXENJ");
-static const CBitcoinAddress addr1C("1NoJrossxPBKfCHuJXT4HadJrXRE9Fxiqs");
-static const CBitcoinAddress addr2C("1CRj2HyM1CXWzHAXLQtiGLyggNT9WQqsDs");
+static const std::string strSecret1 = "5HxWvvfubhXpYYpS3tJkw6fq9jE9j18THftkZjHHfmFiWtmAbrj";
+static const std::string strSecret2 = "5KC4ejrDjv152FGwP386VD1i2NYc5KkfSMyv1nGy1VGDxGHqVY3";
+static const std::string strSecret1C = "Kwr371tjA9u2rFSMZjTNun2PXXP3WPZu2afRHTcta6KxEUdm1vEw";
+static const std::string strSecret2C = "L3Hq7a8FEQwJkW1M2GNKDW28546Vp5miewcCzSqUD9kCAXrJdS3g";
+static const std::string addr1 = "1QFqqMUD55ZV3PJEJZtaKCsQmjLT6JkjvJ";
+static const std::string addr2 = "1F5y5E5FMc5YzdJtB9hLaUe43GDxEKXENJ";
+static const std::string addr1C = "1NoJrossxPBKfCHuJXT4HadJrXRE9Fxiqs";
+static const std::string addr2C = "1CRj2HyM1CXWzHAXLQtiGLyggNT9WQqsDs";
 
-
-static const std::string strAddressBad("1HV9Lc3sNHZxwj4Zk6fB38tEmBryq2cBiF");
+static const std::string strAddressBad = "1HV9Lc3sNHZxwj4Zk6fB38tEmBryq2cBiF";
 
 
 BOOST_FIXTURE_TEST_SUITE(key_tests, BasicTestingSetup)
@@ -74,10 +73,10 @@ BOOST_AUTO_TEST_CASE(key_test1)
     BOOST_CHECK(!key2C.VerifyPubKey(pubkey2));
     BOOST_CHECK(key2C.VerifyPubKey(pubkey2C));
 
-    BOOST_CHECK(addr1.Get()  == CTxDestination(pubkey1.GetID()));
-    BOOST_CHECK(addr2.Get()  == CTxDestination(pubkey2.GetID()));
-    BOOST_CHECK(addr1C.Get() == CTxDestination(pubkey1C.GetID()));
-    BOOST_CHECK(addr2C.Get() == CTxDestination(pubkey2C.GetID()));
+    BOOST_CHECK(DecodeDestination(addr1)  == CTxDestination(pubkey1.GetID()));
+    BOOST_CHECK(DecodeDestination(addr2)  == CTxDestination(pubkey2.GetID()));
+    BOOST_CHECK(DecodeDestination(addr1C) == CTxDestination(pubkey1C.GetID()));
+    BOOST_CHECK(DecodeDestination(addr2C) == CTxDestination(pubkey2C.GetID()));
 
     for (int n=0; n<16; n++)
     {
diff --git a/src/test/mempool_tests.cpp b/src/test/mempool_tests.cpp
index 51b28d09f..116210a29 100644
--- a/src/test/mempool_tests.cpp
+++ b/src/test/mempool_tests.cpp
@@ -559,15 +559,15 @@ BOOST_AUTO_TEST_CASE(MempoolSizeLimitTest)
     // ... we should keep the same min fee until we get a block
     pool.removeForBlock(vtx, 1);
     SetMockTime(42 + 2*CTxMemPool::ROLLING_FEE_HALFLIFE);
-    BOOST_CHECK_EQUAL(pool.GetMinFee(1).GetFeePerK(), (maxFeeRateRemoved.GetFeePerK() + 1000)/2);
+    BOOST_CHECK_EQUAL(pool.GetMinFee(1).GetFeePerK(), llround((maxFeeRateRemoved.GetFeePerK() + 1000)/2.0));
     // ... then feerate should drop 1/2 each halflife
 
     SetMockTime(42 + 2*CTxMemPool::ROLLING_FEE_HALFLIFE + CTxMemPool::ROLLING_FEE_HALFLIFE/2);
-    BOOST_CHECK_EQUAL(pool.GetMinFee(pool.DynamicMemoryUsage() * 5 / 2).GetFeePerK(), (maxFeeRateRemoved.GetFeePerK() + 1000)/4);
+    BOOST_CHECK_EQUAL(pool.GetMinFee(pool.DynamicMemoryUsage() * 5 / 2).GetFeePerK(), llround((maxFeeRateRemoved.GetFeePerK() + 1000)/4.0));
     // ... with a 1/2 halflife when mempool is < 1/2 its target size
 
     SetMockTime(42 + 2*CTxMemPool::ROLLING_FEE_HALFLIFE + CTxMemPool::ROLLING_FEE_HALFLIFE/2 + CTxMemPool::ROLLING_FEE_HALFLIFE/4);
-    BOOST_CHECK_EQUAL(pool.GetMinFee(pool.DynamicMemoryUsage() * 9 / 2).GetFeePerK(), (maxFeeRateRemoved.GetFeePerK() + 1000)/8);
+    BOOST_CHECK_EQUAL(pool.GetMinFee(pool.DynamicMemoryUsage() * 9 / 2).GetFeePerK(), llround((maxFeeRateRemoved.GetFeePerK() + 1000)/8.0));
     // ... with a 1/4 halflife when mempool is < 1/4 its target size
 
     SetMockTime(42 + 7*CTxMemPool::ROLLING_FEE_HALFLIFE + CTxMemPool::ROLLING_FEE_HALFLIFE/2 + CTxMemPool::ROLLING_FEE_HALFLIFE/4);
diff --git a/src/test/merkleblock_tests.cpp b/src/test/merkleblock_tests.cpp
new file mode 100644
index 000000000..3e66c6f2c
--- /dev/null
+++ b/src/test/merkleblock_tests.cpp
@@ -0,0 +1,78 @@
+// Copyright (c) 2012-2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "merkleblock.h"
+#include "uint256.h"
+#include "test/test_bitcoin.h"
+
+#include <boost/test/unit_test.hpp>
+
+
+BOOST_FIXTURE_TEST_SUITE(merkleblock_tests, BasicTestingSetup)
+
+/**
+ * Create a CMerkleBlock using a list of txids which will be found in the
+ * given block.
+ */
+BOOST_AUTO_TEST_CASE(merkleblock_construct_from_txids_found)
+{
+    CBlock block = getBlock13b8a();
+
+    std::set<uint256> txids;
+
+    // Last txn in block.
+    uint256 txhash1 = uint256S("0x74d681e0e03bafa802c8aa084379aa98d9fcd632ddc2ed9782b586ec87451f20");
+
+    // Second txn in block.
+    uint256 txhash2 = uint256S("0xf9fc751cb7dc372406a9f8d738d5e6f8f63bab71986a39cf36ee70ee17036d07");
+
+    txids.insert(txhash1);
+    txids.insert(txhash2);
+
+    CMerkleBlock merkleBlock(block, txids);
+
+    BOOST_CHECK_EQUAL(merkleBlock.header.GetHash().GetHex(), block.GetHash().GetHex());
+
+    // vMatchedTxn is only used when bloom filter is specified.
+    BOOST_CHECK_EQUAL(merkleBlock.vMatchedTxn.size(), 0);
+
+    std::vector<uint256> vMatched;
+    std::vector<unsigned int> vIndex;
+
+    BOOST_CHECK_EQUAL(merkleBlock.txn.ExtractMatches(vMatched, vIndex).GetHex(), block.hashMerkleRoot.GetHex());
+    BOOST_CHECK_EQUAL(vMatched.size(), 2);
+
+    // Ordered by occurrence in depth-first tree traversal.
+    BOOST_CHECK_EQUAL(vMatched[0].ToString(), txhash2.ToString());
+    BOOST_CHECK_EQUAL(vIndex[0], 1);
+
+    BOOST_CHECK_EQUAL(vMatched[1].ToString(), txhash1.ToString());
+    BOOST_CHECK_EQUAL(vIndex[1], 8);
+}
+
+
+/**
+ * Create a CMerkleBlock using a list of txids which will not be found in the
+ * given block.
+ */
+BOOST_AUTO_TEST_CASE(merkleblock_construct_from_txids_not_found)
+{
+    CBlock block = getBlock13b8a();
+
+    std::set<uint256> txids2;
+    txids2.insert(uint256S("0xc0ffee00003bafa802c8aa084379aa98d9fcd632ddc2ed9782b586ec87451f20"));
+    CMerkleBlock merkleBlock(block, txids2);
+
+    BOOST_CHECK_EQUAL(merkleBlock.header.GetHash().GetHex(), block.GetHash().GetHex());
+    BOOST_CHECK_EQUAL(merkleBlock.vMatchedTxn.size(), 0);
+
+    std::vector<uint256> vMatched;
+    std::vector<unsigned int> vIndex;
+
+    BOOST_CHECK_EQUAL(merkleBlock.txn.ExtractMatches(vMatched, vIndex).GetHex(), block.hashMerkleRoot.GetHex());
+    BOOST_CHECK_EQUAL(vMatched.size(), 0);
+    BOOST_CHECK_EQUAL(vIndex.size(), 0);
+}
+
+BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
index eaff2ac70..41e0626eb 100644
--- a/src/test/miner_tests.cpp
+++ b/src/test/miner_tests.cpp
@@ -32,7 +32,6 @@ static BlockAssembler AssemblerForTest(const CChainParams& params) {
     BlockAssembler::Options options;
 
     options.nBlockMaxWeight = MAX_BLOCK_WEIGHT;
-    options.nBlockMaxSize = MAX_BLOCK_SERIALIZED_SIZE;
     options.blockMinFeeRate = blockMinFeeRate;
     return BlockAssembler(params, options);
 }
@@ -236,7 +235,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
         pblock->hashMerkleRoot = BlockMerkleRoot(*pblock);
         pblock->nNonce = blockinfo[i].nonce;
         std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(*pblock);
-        BOOST_CHECK(ProcessNewBlock(chainparams, shared_pblock, true, NULL));
+        BOOST_CHECK(ProcessNewBlock(chainparams, shared_pblock, true, nullptr));
         pblock->hashPrevBlock = pblock->GetHash();
     }
 
diff --git a/src/test/multisig_tests.cpp b/src/test/multisig_tests.cpp
index c686f679c..de7f3b48f 100644
--- a/src/test/multisig_tests.cpp
+++ b/src/test/multisig_tests.cpp
@@ -16,8 +16,6 @@
 
 #include <boost/test/unit_test.hpp>
 
-typedef std::vector<unsigned char> valtype;
-
 BOOST_FIXTURE_TEST_SUITE(multisig_tests, BasicTestingSetup)
 
 CScript
@@ -79,20 +77,20 @@ BOOST_AUTO_TEST_CASE(multisig_verify)
     keys.assign(1,key[0]);
     keys.push_back(key[1]);
     s = sign_multisig(a_and_b, keys, txTo[0], 0);
-    BOOST_CHECK(VerifyScript(s, a_and_b, NULL, flags, MutableTransactionSignatureChecker(&txTo[0], 0, amount), &err));
+    BOOST_CHECK(VerifyScript(s, a_and_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[0], 0, amount), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
 
     for (int i = 0; i < 4; i++)
     {
         keys.assign(1,key[i]);
         s = sign_multisig(a_and_b, keys, txTo[0], 0);
-        BOOST_CHECK_MESSAGE(!VerifyScript(s, a_and_b, NULL, flags, MutableTransactionSignatureChecker(&txTo[0], 0, amount), &err), strprintf("a&b 1: %d", i));
+        BOOST_CHECK_MESSAGE(!VerifyScript(s, a_and_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[0], 0, amount), &err), strprintf("a&b 1: %d", i));
         BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_INVALID_STACK_OPERATION, ScriptErrorString(err));
 
         keys.assign(1,key[1]);
         keys.push_back(key[i]);
         s = sign_multisig(a_and_b, keys, txTo[0], 0);
-        BOOST_CHECK_MESSAGE(!VerifyScript(s, a_and_b, NULL, flags, MutableTransactionSignatureChecker(&txTo[0], 0, amount), &err), strprintf("a&b 2: %d", i));
+        BOOST_CHECK_MESSAGE(!VerifyScript(s, a_and_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[0], 0, amount), &err), strprintf("a&b 2: %d", i));
         BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
     }
 
@@ -103,18 +101,18 @@ BOOST_AUTO_TEST_CASE(multisig_verify)
         s = sign_multisig(a_or_b, keys, txTo[1], 0);
         if (i == 0 || i == 1)
         {
-            BOOST_CHECK_MESSAGE(VerifyScript(s, a_or_b, NULL, flags, MutableTransactionSignatureChecker(&txTo[1], 0, amount), &err), strprintf("a|b: %d", i));
+            BOOST_CHECK_MESSAGE(VerifyScript(s, a_or_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[1], 0, amount), &err), strprintf("a|b: %d", i));
             BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
         }
         else
         {
-            BOOST_CHECK_MESSAGE(!VerifyScript(s, a_or_b, NULL, flags, MutableTransactionSignatureChecker(&txTo[1], 0, amount), &err), strprintf("a|b: %d", i));
+            BOOST_CHECK_MESSAGE(!VerifyScript(s, a_or_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[1], 0, amount), &err), strprintf("a|b: %d", i));
             BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
         }
     }
     s.clear();
     s << OP_0 << OP_1;
-    BOOST_CHECK(!VerifyScript(s, a_or_b, NULL, flags, MutableTransactionSignatureChecker(&txTo[1], 0, amount), &err));
+    BOOST_CHECK(!VerifyScript(s, a_or_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[1], 0, amount), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_SIG_DER, ScriptErrorString(err));
 
 
@@ -126,12 +124,12 @@ BOOST_AUTO_TEST_CASE(multisig_verify)
             s = sign_multisig(escrow, keys, txTo[2], 0);
             if (i < j && i < 3 && j < 3)
             {
-                BOOST_CHECK_MESSAGE(VerifyScript(s, escrow, NULL, flags, MutableTransactionSignatureChecker(&txTo[2], 0, amount), &err), strprintf("escrow 1: %d %d", i, j));
+                BOOST_CHECK_MESSAGE(VerifyScript(s, escrow, nullptr, flags, MutableTransactionSignatureChecker(&txTo[2], 0, amount), &err), strprintf("escrow 1: %d %d", i, j));
                 BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
             }
             else
             {
-                BOOST_CHECK_MESSAGE(!VerifyScript(s, escrow, NULL, flags, MutableTransactionSignatureChecker(&txTo[2], 0, amount), &err), strprintf("escrow 2: %d %d", i, j));
+                BOOST_CHECK_MESSAGE(!VerifyScript(s, escrow, nullptr, flags, MutableTransactionSignatureChecker(&txTo[2], 0, amount), &err), strprintf("escrow 2: %d %d", i, j));
                 BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
             }
         }
@@ -173,95 +171,6 @@ BOOST_AUTO_TEST_CASE(multisig_IsStandard)
         BOOST_CHECK(!::IsStandard(malformed[i], whichType));
 }
 
-BOOST_AUTO_TEST_CASE(multisig_Solver1)
-{
-    // Tests Solver() that returns lists of keys that are
-    // required to satisfy a ScriptPubKey
-    //
-    // Also tests IsMine() and ExtractDestination()
-    //
-    // Note: ExtractDestination for the multisignature transactions
-    // always returns false for this release, even if you have
-    // one key that would satisfy an (a|b) or 2-of-3 keys needed
-    // to spend an escrow transaction.
-    //
-    CBasicKeyStore keystore, emptykeystore, partialkeystore;
-    CKey key[3];
-    CTxDestination keyaddr[3];
-    for (int i = 0; i < 3; i++)
-    {
-        key[i].MakeNewKey(true);
-        keystore.AddKey(key[i]);
-        keyaddr[i] = key[i].GetPubKey().GetID();
-    }
-    partialkeystore.AddKey(key[0]);
-
-    {
-        std::vector<valtype> solutions;
-        txnouttype whichType;
-        CScript s;
-        s << ToByteVector(key[0].GetPubKey()) << OP_CHECKSIG;
-        BOOST_CHECK(Solver(s, whichType, solutions));
-        BOOST_CHECK(solutions.size() == 1);
-        CTxDestination addr;
-        BOOST_CHECK(ExtractDestination(s, addr));
-        BOOST_CHECK(addr == keyaddr[0]);
-        BOOST_CHECK(IsMine(keystore, s));
-        BOOST_CHECK(!IsMine(emptykeystore, s));
-    }
-    {
-        std::vector<valtype> solutions;
-        txnouttype whichType;
-        CScript s;
-        s << OP_DUP << OP_HASH160 << ToByteVector(key[0].GetPubKey().GetID()) << OP_EQUALVERIFY << OP_CHECKSIG;
-        BOOST_CHECK(Solver(s, whichType, solutions));
-        BOOST_CHECK(solutions.size() == 1);
-        CTxDestination addr;
-        BOOST_CHECK(ExtractDestination(s, addr));
-        BOOST_CHECK(addr == keyaddr[0]);
-        BOOST_CHECK(IsMine(keystore, s));
-        BOOST_CHECK(!IsMine(emptykeystore, s));
-    }
-    {
-        std::vector<valtype> solutions;
-        txnouttype whichType;
-        CScript s;
-        s << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
-        BOOST_CHECK(Solver(s, whichType, solutions));
-        BOOST_CHECK_EQUAL(solutions.size(), 4U);
-        CTxDestination addr;
-        BOOST_CHECK(!ExtractDestination(s, addr));
-        BOOST_CHECK(IsMine(keystore, s));
-        BOOST_CHECK(!IsMine(emptykeystore, s));
-        BOOST_CHECK(!IsMine(partialkeystore, s));
-    }
-    {
-        std::vector<valtype> solutions;
-        txnouttype whichType;
-        CScript s;
-        s << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
-        BOOST_CHECK(Solver(s, whichType, solutions));
-        BOOST_CHECK_EQUAL(solutions.size(), 4U);
-        std::vector<CTxDestination> addrs;
-        int nRequired;
-        BOOST_CHECK(ExtractDestinations(s, whichType, addrs, nRequired));
-        BOOST_CHECK(addrs[0] == keyaddr[0]);
-        BOOST_CHECK(addrs[1] == keyaddr[1]);
-        BOOST_CHECK(nRequired == 1);
-        BOOST_CHECK(IsMine(keystore, s));
-        BOOST_CHECK(!IsMine(emptykeystore, s));
-        BOOST_CHECK(!IsMine(partialkeystore, s));
-    }
-    {
-        std::vector<valtype> solutions;
-        txnouttype whichType;
-        CScript s;
-        s << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << ToByteVector(key[2].GetPubKey()) << OP_3 << OP_CHECKMULTISIG;
-        BOOST_CHECK(Solver(s, whichType, solutions));
-        BOOST_CHECK(solutions.size() == 5);
-    }
-}
-
 BOOST_AUTO_TEST_CASE(multisig_Sign)
 {
     // Test SignSignature() (and therefore the version of Solver() that signs transactions)
diff --git a/src/test/net_tests.cpp b/src/test/net_tests.cpp
index 095d86834..31b05d868 100644
--- a/src/test/net_tests.cpp
+++ b/src/test/net_tests.cpp
@@ -80,7 +80,7 @@ BOOST_AUTO_TEST_CASE(cnode_listen_port)
     BOOST_CHECK(port == Params().GetDefaultPort());
     // test set port
     unsigned short altPort = 12345;
-    SoftSetArg("-port", std::to_string(altPort));
+    gArgs.SoftSetArg("-port", std::to_string(altPort));
     port = GetListenPort();
     BOOST_CHECK(port == altPort);
 }
diff --git a/src/test/pow_tests.cpp b/src/test/pow_tests.cpp
index b9fabd02e..b13f2625a 100644
--- a/src/test/pow_tests.cpp
+++ b/src/test/pow_tests.cpp
@@ -66,7 +66,7 @@ BOOST_AUTO_TEST_CASE(GetBlockProofEquivalentTime_test)
     const auto chainParams = CreateChainParams(CBaseChainParams::MAIN);
     std::vector<CBlockIndex> blocks(10000);
     for (int i = 0; i < 10000; i++) {
-        blocks[i].pprev = i ? &blocks[i - 1] : NULL;
+        blocks[i].pprev = i ? &blocks[i - 1] : nullptr;
         blocks[i].nHeight = i;
         blocks[i].nTime = 1269211443 + i * chainParams->GetConsensus().nPowTargetSpacing;
         blocks[i].nBits = 0x207fffff; /* target 0x7fffff000... */
diff --git a/src/test/prevector_tests.cpp b/src/test/prevector_tests.cpp
index 345c4a214..841282873 100644
--- a/src/test/prevector_tests.cpp
+++ b/src/test/prevector_tests.cpp
@@ -152,11 +152,11 @@ class prevector_tester {
         pre_vector.assign(n, value);
     }
 
-    Size size() {
+    Size size() const {
         return real_vector.size();
     }
 
-    Size capacity() {
+    Size capacity() const {
         return pre_vector.capacity();
     }
 
diff --git a/src/test/raii_event_tests.cpp b/src/test/raii_event_tests.cpp
index 0f40874f5..0d541ec7d 100644
--- a/src/test/raii_event_tests.cpp
+++ b/src/test/raii_event_tests.cpp
@@ -42,7 +42,7 @@ BOOST_AUTO_TEST_CASE(raii_event_creation)
 {
     event_set_mem_functions(tag_malloc, realloc, tag_free);
     
-    void* base_ptr = NULL;
+    void* base_ptr = nullptr;
     {
         auto base = obtain_event_base();
         base_ptr = (void*)base.get();
@@ -50,10 +50,10 @@ BOOST_AUTO_TEST_CASE(raii_event_creation)
     }
     BOOST_CHECK(tags[base_ptr] == 0);
     
-    void* event_ptr = NULL;
+    void* event_ptr = nullptr;
     {
         auto base = obtain_event_base();
-        auto event = obtain_event(base.get(), -1, 0, NULL, NULL);
+        auto event = obtain_event(base.get(), -1, 0, nullptr, nullptr);
 
         base_ptr = (void*)base.get();
         event_ptr = (void*)event.get();
@@ -71,11 +71,11 @@ BOOST_AUTO_TEST_CASE(raii_event_order)
 {
     event_set_mem_functions(tag_malloc, realloc, tag_free);
     
-    void* base_ptr = NULL;
-    void* event_ptr = NULL;
+    void* base_ptr = nullptr;
+    void* event_ptr = nullptr;
     {
         auto base = obtain_event_base();
-        auto event = obtain_event(base.get(), -1, 0, NULL, NULL);
+        auto event = obtain_event(base.get(), -1, 0, nullptr, nullptr);
 
         base_ptr = (void*)base.get();
         event_ptr = (void*)event.get();
diff --git a/src/test/script_P2SH_tests.cpp b/src/test/script_P2SH_tests.cpp
index 0789b2e80..58aa32c96 100644
--- a/src/test/script_P2SH_tests.cpp
+++ b/src/test/script_P2SH_tests.cpp
@@ -42,7 +42,7 @@ Verify(const CScript& scriptSig, const CScript& scriptPubKey, bool fStrict, Scri
     txTo.vin[0].scriptSig = scriptSig;
     txTo.vout[0].nValue = 1;
 
-    return VerifyScript(scriptSig, scriptPubKey, NULL, fStrict ? SCRIPT_VERIFY_P2SH : SCRIPT_VERIFY_NONE, MutableTransactionSignatureChecker(&txTo, 0, txFrom.vout[0].nValue), &err);
+    return VerifyScript(scriptSig, scriptPubKey, nullptr, fStrict ? SCRIPT_VERIFY_P2SH : SCRIPT_VERIFY_NONE, MutableTransactionSignatureChecker(&txTo, 0, txFrom.vout[0].nValue), &err);
 }
 
 
@@ -112,8 +112,7 @@ BOOST_AUTO_TEST_CASE(sign)
         {
             CScript sigSave = txTo[i].vin[0].scriptSig;
             txTo[i].vin[0].scriptSig = txTo[j].vin[0].scriptSig;
-            const CTxOut& output = txFrom.vout[txTo[i].vin[0].prevout.n];
-            bool sigOK = CScriptCheck(output.scriptPubKey, output.nValue, txTo[i], 0, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC, false, &txdata)();
+            bool sigOK = CScriptCheck(txFrom.vout[txTo[i].vin[0].prevout.n], txTo[i], 0, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC, false, &txdata)();
             if (i == j)
                 BOOST_CHECK_MESSAGE(sigOK, strprintf("VerifySignature %d %d", i, j));
             else
diff --git a/src/test/script_standard_tests.cpp b/src/test/script_standard_tests.cpp
new file mode 100644
index 000000000..bd2d9ed11
--- /dev/null
+++ b/src/test/script_standard_tests.cpp
@@ -0,0 +1,741 @@
+// Copyright (c) 2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "key.h"
+#include "keystore.h"
+#include "script/ismine.h"
+#include "script/script.h"
+#include "script/script_error.h"
+#include "script/standard.h"
+#include "test/test_bitcoin.h"
+
+#include <boost/test/unit_test.hpp>
+
+
+BOOST_FIXTURE_TEST_SUITE(script_standard_tests, BasicTestingSetup)
+
+BOOST_AUTO_TEST_CASE(script_standard_Solver_success)
+{
+    CKey keys[3];
+    CPubKey pubkeys[3];
+    for (int i = 0; i < 3; i++) {
+        keys[i].MakeNewKey(true);
+        pubkeys[i] = keys[i].GetPubKey();
+    }
+
+    CScript s;
+    txnouttype whichType;
+    std::vector<std::vector<unsigned char> > solutions;
+
+    // TX_PUBKEY
+    s.clear();
+    s << ToByteVector(pubkeys[0]) << OP_CHECKSIG;
+    BOOST_CHECK(Solver(s, whichType, solutions));
+    BOOST_CHECK_EQUAL(whichType, TX_PUBKEY);
+    BOOST_CHECK_EQUAL(solutions.size(), 1);
+    BOOST_CHECK(solutions[0] == ToByteVector(pubkeys[0]));
+
+    // TX_PUBKEYHASH
+    s.clear();
+    s << OP_DUP << OP_HASH160 << ToByteVector(pubkeys[0].GetID()) << OP_EQUALVERIFY << OP_CHECKSIG;
+    BOOST_CHECK(Solver(s, whichType, solutions));
+    BOOST_CHECK_EQUAL(whichType, TX_PUBKEYHASH);
+    BOOST_CHECK_EQUAL(solutions.size(), 1);
+    BOOST_CHECK(solutions[0] == ToByteVector(pubkeys[0].GetID()));
+
+    // TX_SCRIPTHASH
+    CScript redeemScript(s); // initialize with leftover P2PKH script
+    s.clear();
+    s << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
+    BOOST_CHECK(Solver(s, whichType, solutions));
+    BOOST_CHECK_EQUAL(whichType, TX_SCRIPTHASH);
+    BOOST_CHECK_EQUAL(solutions.size(), 1);
+    BOOST_CHECK(solutions[0] == ToByteVector(CScriptID(redeemScript)));
+
+    // TX_MULTISIG
+    s.clear();
+    s << OP_1 <<
+        ToByteVector(pubkeys[0]) <<
+        ToByteVector(pubkeys[1]) <<
+        OP_2 << OP_CHECKMULTISIG;
+    BOOST_CHECK(Solver(s, whichType, solutions));
+    BOOST_CHECK_EQUAL(whichType, TX_MULTISIG);
+    BOOST_CHECK_EQUAL(solutions.size(), 4);
+    BOOST_CHECK(solutions[0] == std::vector<unsigned char>({1}));
+    BOOST_CHECK(solutions[1] == ToByteVector(pubkeys[0]));
+    BOOST_CHECK(solutions[2] == ToByteVector(pubkeys[1]));
+    BOOST_CHECK(solutions[3] == std::vector<unsigned char>({2}));
+
+    s.clear();
+    s << OP_2 <<
+        ToByteVector(pubkeys[0]) <<
+        ToByteVector(pubkeys[1]) <<
+        ToByteVector(pubkeys[2]) <<
+        OP_3 << OP_CHECKMULTISIG;
+    BOOST_CHECK(Solver(s, whichType, solutions));
+    BOOST_CHECK_EQUAL(whichType, TX_MULTISIG);
+    BOOST_CHECK_EQUAL(solutions.size(), 5);
+    BOOST_CHECK(solutions[0] == std::vector<unsigned char>({2}));
+    BOOST_CHECK(solutions[1] == ToByteVector(pubkeys[0]));
+    BOOST_CHECK(solutions[2] == ToByteVector(pubkeys[1]));
+    BOOST_CHECK(solutions[3] == ToByteVector(pubkeys[2]));
+    BOOST_CHECK(solutions[4] == std::vector<unsigned char>({3}));
+
+    // TX_NULL_DATA
+    s.clear();
+    s << OP_RETURN <<
+        std::vector<unsigned char>({0}) <<
+        std::vector<unsigned char>({75}) <<
+        std::vector<unsigned char>({255});
+    BOOST_CHECK(Solver(s, whichType, solutions));
+    BOOST_CHECK_EQUAL(whichType, TX_NULL_DATA);
+    BOOST_CHECK_EQUAL(solutions.size(), 0);
+
+    // TX_WITNESS_V0_KEYHASH
+    s.clear();
+    s << OP_0 << ToByteVector(pubkeys[0].GetID());
+    BOOST_CHECK(Solver(s, whichType, solutions));
+    BOOST_CHECK_EQUAL(whichType, TX_WITNESS_V0_KEYHASH);
+    BOOST_CHECK_EQUAL(solutions.size(), 1);
+    BOOST_CHECK(solutions[0] == ToByteVector(pubkeys[0].GetID()));
+
+    // TX_WITNESS_V0_SCRIPTHASH
+    uint256 scriptHash;
+    CSHA256().Write(&redeemScript[0], redeemScript.size())
+        .Finalize(scriptHash.begin());
+
+    s.clear();
+    s << OP_0 << ToByteVector(scriptHash);
+    BOOST_CHECK(Solver(s, whichType, solutions));
+    BOOST_CHECK_EQUAL(whichType, TX_WITNESS_V0_SCRIPTHASH);
+    BOOST_CHECK_EQUAL(solutions.size(), 1);
+    BOOST_CHECK(solutions[0] == ToByteVector(scriptHash));
+
+    // TX_NONSTANDARD
+    s.clear();
+    s << OP_9 << OP_ADD << OP_11 << OP_EQUAL;
+    BOOST_CHECK(!Solver(s, whichType, solutions));
+    BOOST_CHECK_EQUAL(whichType, TX_NONSTANDARD);
+}
+
+BOOST_AUTO_TEST_CASE(script_standard_Solver_failure)
+{
+    CKey key;
+    CPubKey pubkey;
+    key.MakeNewKey(true);
+    pubkey = key.GetPubKey();
+
+    CScript s;
+    txnouttype whichType;
+    std::vector<std::vector<unsigned char> > solutions;
+
+    // TX_PUBKEY with incorrectly sized pubkey
+    s.clear();
+    s << std::vector<unsigned char>(30, 0x01) << OP_CHECKSIG;
+    BOOST_CHECK(!Solver(s, whichType, solutions));
+
+    // TX_PUBKEYHASH with incorrectly sized key hash
+    s.clear();
+    s << OP_DUP << OP_HASH160 << ToByteVector(pubkey) << OP_EQUALVERIFY << OP_CHECKSIG;
+    BOOST_CHECK(!Solver(s, whichType, solutions));
+
+    // TX_SCRIPTHASH with incorrectly sized script hash
+    s.clear();
+    s << OP_HASH160 << std::vector<unsigned char>(21, 0x01) << OP_EQUAL;
+    BOOST_CHECK(!Solver(s, whichType, solutions));
+
+    // TX_MULTISIG 0/2
+    s.clear();
+    s << OP_0 << ToByteVector(pubkey) << OP_1 << OP_CHECKMULTISIG;
+    BOOST_CHECK(!Solver(s, whichType, solutions));
+
+    // TX_MULTISIG 2/1
+    s.clear();
+    s << OP_2 << ToByteVector(pubkey) << OP_1 << OP_CHECKMULTISIG;
+    BOOST_CHECK(!Solver(s, whichType, solutions));
+
+    // TX_MULTISIG n = 2 with 1 pubkey
+    s.clear();
+    s << OP_1 << ToByteVector(pubkey) << OP_2 << OP_CHECKMULTISIG;
+    BOOST_CHECK(!Solver(s, whichType, solutions));
+
+    // TX_MULTISIG n = 1 with 0 pubkeys
+    s.clear();
+    s << OP_1 << OP_1 << OP_CHECKMULTISIG;
+    BOOST_CHECK(!Solver(s, whichType, solutions));
+
+    // TX_NULL_DATA with other opcodes
+    s.clear();
+    s << OP_RETURN << std::vector<unsigned char>({75}) << OP_ADD;
+    BOOST_CHECK(!Solver(s, whichType, solutions));
+
+    // TX_WITNESS with incorrect program size
+    s.clear();
+    s << OP_0 << std::vector<unsigned char>(19, 0x01);
+    BOOST_CHECK(!Solver(s, whichType, solutions));
+}
+
+BOOST_AUTO_TEST_CASE(script_standard_ExtractDestination)
+{
+    CKey key;
+    CPubKey pubkey;
+    key.MakeNewKey(true);
+    pubkey = key.GetPubKey();
+
+    CScript s;
+    CTxDestination address;
+
+    // TX_PUBKEY
+    s.clear();
+    s << ToByteVector(pubkey) << OP_CHECKSIG;
+    BOOST_CHECK(ExtractDestination(s, address));
+    BOOST_CHECK(boost::get<CKeyID>(&address) &&
+                *boost::get<CKeyID>(&address) == pubkey.GetID());
+
+    // TX_PUBKEYHASH
+    s.clear();
+    s << OP_DUP << OP_HASH160 << ToByteVector(pubkey.GetID()) << OP_EQUALVERIFY << OP_CHECKSIG;
+    BOOST_CHECK(ExtractDestination(s, address));
+    BOOST_CHECK(boost::get<CKeyID>(&address) &&
+                *boost::get<CKeyID>(&address) == pubkey.GetID());
+
+    // TX_SCRIPTHASH
+    CScript redeemScript(s); // initialize with leftover P2PKH script
+    s.clear();
+    s << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
+    BOOST_CHECK(ExtractDestination(s, address));
+    BOOST_CHECK(boost::get<CScriptID>(&address) &&
+                *boost::get<CScriptID>(&address) == CScriptID(redeemScript));
+
+    // TX_MULTISIG
+    s.clear();
+    s << OP_1 << ToByteVector(pubkey) << OP_1 << OP_CHECKMULTISIG;
+    BOOST_CHECK(!ExtractDestination(s, address));
+
+    // TX_NULL_DATA
+    s.clear();
+    s << OP_RETURN << std::vector<unsigned char>({75});
+    BOOST_CHECK(!ExtractDestination(s, address));
+
+    // TX_WITNESS_V0_KEYHASH
+    s.clear();
+    s << OP_0 << ToByteVector(pubkey.GetID());
+    BOOST_CHECK(ExtractDestination(s, address));
+    WitnessV0KeyHash keyhash;
+    CHash160().Write(pubkey.begin(), pubkey.size()).Finalize(keyhash.begin());
+    BOOST_CHECK(boost::get<WitnessV0KeyHash>(&address) && *boost::get<WitnessV0KeyHash>(&address) == keyhash);
+
+    // TX_WITNESS_V0_SCRIPTHASH
+    s.clear();
+    WitnessV0ScriptHash scripthash;
+    CSHA256().Write(redeemScript.data(), redeemScript.size()).Finalize(scripthash.begin());
+    s << OP_0 << ToByteVector(scripthash);
+    BOOST_CHECK(ExtractDestination(s, address));
+    BOOST_CHECK(boost::get<WitnessV0ScriptHash>(&address) && *boost::get<WitnessV0ScriptHash>(&address) == scripthash);
+
+    // TX_WITNESS with unknown version
+    s.clear();
+    s << OP_1 << ToByteVector(pubkey);
+    BOOST_CHECK(ExtractDestination(s, address));
+    WitnessUnknown unk;
+    unk.length = 33;
+    unk.version = 1;
+    std::copy(pubkey.begin(), pubkey.end(), unk.program);
+    BOOST_CHECK(boost::get<WitnessUnknown>(&address) && *boost::get<WitnessUnknown>(&address) == unk);
+}
+
+BOOST_AUTO_TEST_CASE(script_standard_ExtractDestinations)
+{
+    CKey keys[3];
+    CPubKey pubkeys[3];
+    for (int i = 0; i < 3; i++) {
+        keys[i].MakeNewKey(true);
+        pubkeys[i] = keys[i].GetPubKey();
+    }
+
+    CScript s;
+    txnouttype whichType;
+    std::vector<CTxDestination> addresses;
+    int nRequired;
+
+    // TX_PUBKEY
+    s.clear();
+    s << ToByteVector(pubkeys[0]) << OP_CHECKSIG;
+    BOOST_CHECK(ExtractDestinations(s, whichType, addresses, nRequired));
+    BOOST_CHECK_EQUAL(whichType, TX_PUBKEY);
+    BOOST_CHECK_EQUAL(addresses.size(), 1);
+    BOOST_CHECK_EQUAL(nRequired, 1);
+    BOOST_CHECK(boost::get<CKeyID>(&addresses[0]) &&
+                *boost::get<CKeyID>(&addresses[0]) == pubkeys[0].GetID());
+
+    // TX_PUBKEYHASH
+    s.clear();
+    s << OP_DUP << OP_HASH160 << ToByteVector(pubkeys[0].GetID()) << OP_EQUALVERIFY << OP_CHECKSIG;
+    BOOST_CHECK(ExtractDestinations(s, whichType, addresses, nRequired));
+    BOOST_CHECK_EQUAL(whichType, TX_PUBKEYHASH);
+    BOOST_CHECK_EQUAL(addresses.size(), 1);
+    BOOST_CHECK_EQUAL(nRequired, 1);
+    BOOST_CHECK(boost::get<CKeyID>(&addresses[0]) &&
+                *boost::get<CKeyID>(&addresses[0]) == pubkeys[0].GetID());
+
+    // TX_SCRIPTHASH
+    CScript redeemScript(s); // initialize with leftover P2PKH script
+    s.clear();
+    s << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
+    BOOST_CHECK(ExtractDestinations(s, whichType, addresses, nRequired));
+    BOOST_CHECK_EQUAL(whichType, TX_SCRIPTHASH);
+    BOOST_CHECK_EQUAL(addresses.size(), 1);
+    BOOST_CHECK_EQUAL(nRequired, 1);
+    BOOST_CHECK(boost::get<CScriptID>(&addresses[0]) &&
+                *boost::get<CScriptID>(&addresses[0]) == CScriptID(redeemScript));
+
+    // TX_MULTISIG
+    s.clear();
+    s << OP_2 <<
+        ToByteVector(pubkeys[0]) <<
+        ToByteVector(pubkeys[1]) <<
+        OP_2 << OP_CHECKMULTISIG;
+    BOOST_CHECK(ExtractDestinations(s, whichType, addresses, nRequired));
+    BOOST_CHECK_EQUAL(whichType, TX_MULTISIG);
+    BOOST_CHECK_EQUAL(addresses.size(), 2);
+    BOOST_CHECK_EQUAL(nRequired, 2);
+    BOOST_CHECK(boost::get<CKeyID>(&addresses[0]) &&
+                *boost::get<CKeyID>(&addresses[0]) == pubkeys[0].GetID());
+    BOOST_CHECK(boost::get<CKeyID>(&addresses[1]) &&
+                *boost::get<CKeyID>(&addresses[1]) == pubkeys[1].GetID());
+
+    // TX_NULL_DATA
+    s.clear();
+    s << OP_RETURN << std::vector<unsigned char>({75});
+    BOOST_CHECK(!ExtractDestinations(s, whichType, addresses, nRequired));
+}
+
+BOOST_AUTO_TEST_CASE(script_standard_GetScriptFor_)
+{
+    CKey keys[3];
+    CPubKey pubkeys[3];
+    for (int i = 0; i < 3; i++) {
+        keys[i].MakeNewKey(true);
+        pubkeys[i] = keys[i].GetPubKey();
+    }
+
+    CScript expected, result;
+
+    // CKeyID
+    expected.clear();
+    expected << OP_DUP << OP_HASH160 << ToByteVector(pubkeys[0].GetID()) << OP_EQUALVERIFY << OP_CHECKSIG;
+    result = GetScriptForDestination(pubkeys[0].GetID());
+    BOOST_CHECK(result == expected);
+
+    // CScriptID
+    CScript redeemScript(result);
+    expected.clear();
+    expected << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
+    result = GetScriptForDestination(CScriptID(redeemScript));
+    BOOST_CHECK(result == expected);
+
+    // CNoDestination
+    expected.clear();
+    result = GetScriptForDestination(CNoDestination());
+    BOOST_CHECK(result == expected);
+
+    // GetScriptForRawPubKey
+    expected.clear();
+    expected << ToByteVector(pubkeys[0]) << OP_CHECKSIG;
+    result = GetScriptForRawPubKey(pubkeys[0]);
+    BOOST_CHECK(result == expected);
+
+    // GetScriptForMultisig
+    expected.clear();
+    expected << OP_2 <<
+        ToByteVector(pubkeys[0]) <<
+        ToByteVector(pubkeys[1]) <<
+        ToByteVector(pubkeys[2]) <<
+        OP_3 << OP_CHECKMULTISIG;
+    result = GetScriptForMultisig(2, std::vector<CPubKey>(pubkeys, pubkeys + 3));
+    BOOST_CHECK(result == expected);
+
+    // GetScriptForWitness
+    CScript witnessScript;
+
+    witnessScript << ToByteVector(pubkeys[0]) << OP_CHECKSIG;
+    expected.clear();
+    expected << OP_0 << ToByteVector(pubkeys[0].GetID());
+    result = GetScriptForWitness(witnessScript);
+    BOOST_CHECK(result == expected);
+
+    witnessScript.clear();
+    witnessScript << OP_DUP << OP_HASH160 << ToByteVector(pubkeys[0].GetID()) << OP_EQUALVERIFY << OP_CHECKSIG;
+    result = GetScriptForWitness(witnessScript);
+    BOOST_CHECK(result == expected);
+
+    witnessScript.clear();
+    witnessScript << OP_1 << ToByteVector(pubkeys[0]) << OP_1 << OP_CHECKMULTISIG;
+
+    uint256 scriptHash;
+    CSHA256().Write(&witnessScript[0], witnessScript.size())
+        .Finalize(scriptHash.begin());
+
+    expected.clear();
+    expected << OP_0 << ToByteVector(scriptHash);
+    result = GetScriptForWitness(witnessScript);
+    BOOST_CHECK(result == expected);
+}
+
+BOOST_AUTO_TEST_CASE(script_standard_IsMine)
+{
+    CKey keys[2];
+    CPubKey pubkeys[2];
+    for (int i = 0; i < 2; i++) {
+        keys[i].MakeNewKey(true);
+        pubkeys[i] = keys[i].GetPubKey();
+    }
+
+    CKey uncompressedKey;
+    uncompressedKey.MakeNewKey(false);
+    CPubKey uncompressedPubkey = uncompressedKey.GetPubKey();
+
+    CScript scriptPubKey;
+    isminetype result;
+    bool isInvalid;
+
+    // P2PK compressed
+    {
+        CBasicKeyStore keystore;
+        scriptPubKey.clear();
+        scriptPubKey << ToByteVector(pubkeys[0]) << OP_CHECKSIG;
+
+        // Keystore does not have key
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has key
+        keystore.AddKey(keys[0]);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_SPENDABLE);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // P2PK uncompressed
+    {
+        CBasicKeyStore keystore;
+        scriptPubKey.clear();
+        scriptPubKey << ToByteVector(uncompressedPubkey) << OP_CHECKSIG;
+
+        // Keystore does not have key
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has key
+        keystore.AddKey(uncompressedKey);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_SPENDABLE);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // P2PKH compressed
+    {
+        CBasicKeyStore keystore;
+        scriptPubKey.clear();
+        scriptPubKey << OP_DUP << OP_HASH160 << ToByteVector(pubkeys[0].GetID()) << OP_EQUALVERIFY << OP_CHECKSIG;
+
+        // Keystore does not have key
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has key
+        keystore.AddKey(keys[0]);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_SPENDABLE);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // P2PKH uncompressed
+    {
+        CBasicKeyStore keystore;
+        scriptPubKey.clear();
+        scriptPubKey << OP_DUP << OP_HASH160 << ToByteVector(uncompressedPubkey.GetID()) << OP_EQUALVERIFY << OP_CHECKSIG;
+
+        // Keystore does not have key
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has key
+        keystore.AddKey(uncompressedKey);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_SPENDABLE);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // P2SH
+    {
+        CBasicKeyStore keystore;
+
+        CScript redeemScript;
+        redeemScript << OP_DUP << OP_HASH160 << ToByteVector(pubkeys[0].GetID()) << OP_EQUALVERIFY << OP_CHECKSIG;
+
+        scriptPubKey.clear();
+        scriptPubKey << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
+
+        // Keystore does not have redeemScript or key
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has redeemScript but no key
+        keystore.AddCScript(redeemScript);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has redeemScript and key
+        keystore.AddKey(keys[0]);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_SPENDABLE);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // P2WPKH compressed
+    {
+        CBasicKeyStore keystore;
+        keystore.AddKey(keys[0]);
+
+        scriptPubKey.clear();
+        scriptPubKey << OP_0 << ToByteVector(pubkeys[0].GetID());
+
+        // Keystore has key, but no P2SH redeemScript
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has key and P2SH redeemScript
+        keystore.AddCScript(scriptPubKey);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_SPENDABLE);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // P2WPKH uncompressed
+    {
+        CBasicKeyStore keystore;
+        keystore.AddKey(uncompressedKey);
+
+        scriptPubKey.clear();
+        scriptPubKey << OP_0 << ToByteVector(uncompressedPubkey.GetID());
+
+        // Keystore has key, but no P2SH redeemScript
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has key and P2SH redeemScript
+        keystore.AddCScript(scriptPubKey);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(isInvalid);
+    }
+
+    // scriptPubKey multisig
+    {
+        CBasicKeyStore keystore;
+
+        scriptPubKey.clear();
+        scriptPubKey << OP_2 <<
+            ToByteVector(uncompressedPubkey) <<
+            ToByteVector(pubkeys[1]) <<
+            OP_2 << OP_CHECKMULTISIG;
+
+        // Keystore does not have any keys
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has 1/2 keys
+        keystore.AddKey(uncompressedKey);
+
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has 2/2 keys
+        keystore.AddKey(keys[1]);
+
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_SPENDABLE);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // P2SH multisig
+    {
+        CBasicKeyStore keystore;
+        keystore.AddKey(uncompressedKey);
+        keystore.AddKey(keys[1]);
+
+        CScript redeemScript;
+        redeemScript << OP_2 <<
+            ToByteVector(uncompressedPubkey) <<
+            ToByteVector(pubkeys[1]) <<
+            OP_2 << OP_CHECKMULTISIG;
+
+        scriptPubKey.clear();
+        scriptPubKey << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
+
+        // Keystore has no redeemScript
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has redeemScript
+        keystore.AddCScript(redeemScript);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_SPENDABLE);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // P2WSH multisig with compressed keys
+    {
+        CBasicKeyStore keystore;
+        keystore.AddKey(keys[0]);
+        keystore.AddKey(keys[1]);
+
+        CScript witnessScript;
+        witnessScript << OP_2 <<
+            ToByteVector(pubkeys[0]) <<
+            ToByteVector(pubkeys[1]) <<
+            OP_2 << OP_CHECKMULTISIG;
+
+        uint256 scriptHash;
+        CSHA256().Write(&witnessScript[0], witnessScript.size())
+            .Finalize(scriptHash.begin());
+
+        scriptPubKey.clear();
+        scriptPubKey << OP_0 << ToByteVector(scriptHash);
+
+        // Keystore has keys, but no witnessScript or P2SH redeemScript
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has keys and witnessScript, but no P2SH redeemScript
+        keystore.AddCScript(witnessScript);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has keys, witnessScript, P2SH redeemScript
+        keystore.AddCScript(scriptPubKey);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_SPENDABLE);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // P2WSH multisig with uncompressed key
+    {
+        CBasicKeyStore keystore;
+        keystore.AddKey(uncompressedKey);
+        keystore.AddKey(keys[1]);
+
+        CScript witnessScript;
+        witnessScript << OP_2 <<
+            ToByteVector(uncompressedPubkey) <<
+            ToByteVector(pubkeys[1]) <<
+            OP_2 << OP_CHECKMULTISIG;
+
+        uint256 scriptHash;
+        CSHA256().Write(&witnessScript[0], witnessScript.size())
+            .Finalize(scriptHash.begin());
+
+        scriptPubKey.clear();
+        scriptPubKey << OP_0 << ToByteVector(scriptHash);
+
+        // Keystore has keys, but no witnessScript or P2SH redeemScript
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has keys and witnessScript, but no P2SH redeemScript
+        keystore.AddCScript(witnessScript);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has keys, witnessScript, P2SH redeemScript
+        keystore.AddCScript(scriptPubKey);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(isInvalid);
+    }
+
+    // P2WSH multisig wrapped in P2SH
+    {
+        CBasicKeyStore keystore;
+
+        CScript witnessScript;
+        witnessScript << OP_2 <<
+            ToByteVector(pubkeys[0]) <<
+            ToByteVector(pubkeys[1]) <<
+            OP_2 << OP_CHECKMULTISIG;
+
+        uint256 scriptHash;
+        CSHA256().Write(&witnessScript[0], witnessScript.size())
+            .Finalize(scriptHash.begin());
+
+        CScript redeemScript;
+        redeemScript << OP_0 << ToByteVector(scriptHash);
+
+        scriptPubKey.clear();
+        scriptPubKey << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
+
+        // Keystore has no witnessScript, P2SH redeemScript, or keys
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has witnessScript and P2SH redeemScript, but no keys
+        keystore.AddCScript(redeemScript);
+        keystore.AddCScript(witnessScript);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+
+        // Keystore has keys, witnessScript, P2SH redeemScript
+        keystore.AddKey(keys[0]);
+        keystore.AddKey(keys[1]);
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_SPENDABLE);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // OP_RETURN
+    {
+        CBasicKeyStore keystore;
+        keystore.AddKey(keys[0]);
+
+        scriptPubKey.clear();
+        scriptPubKey << OP_RETURN << ToByteVector(pubkeys[0]);
+
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+    }
+
+    // Nonstandard
+    {
+        CBasicKeyStore keystore;
+        keystore.AddKey(keys[0]);
+
+        scriptPubKey.clear();
+        scriptPubKey << OP_9 << OP_ADD << OP_11 << OP_EQUAL;
+
+        result = IsMine(keystore, scriptPubKey, isInvalid);
+        BOOST_CHECK_EQUAL(result, ISMINE_NO);
+        BOOST_CHECK(!isInvalid);
+    }
+}
+
+BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/script_tests.cpp b/src/test/script_tests.cpp
index a18471588..011a5db79 100644
--- a/src/test/script_tests.cpp
+++ b/src/test/script_tests.cpp
@@ -172,10 +172,10 @@ void DoTest(const CScript& scriptPubKey, const CScript& scriptSig, const CScript
     int libconsensus_flags = flags & bitcoinconsensus_SCRIPT_FLAGS_VERIFY_ALL;
     if (libconsensus_flags == flags) {
         if (flags & bitcoinconsensus_SCRIPT_FLAGS_VERIFY_WITNESS) {
-            BOOST_CHECK_MESSAGE(bitcoinconsensus_verify_script_with_amount(scriptPubKey.data(), scriptPubKey.size(), txCredit.vout[0].nValue, (const unsigned char*)&stream[0], stream.size(), 0, libconsensus_flags, NULL) == expect, message);
+            BOOST_CHECK_MESSAGE(bitcoinconsensus_verify_script_with_amount(scriptPubKey.data(), scriptPubKey.size(), txCredit.vout[0].nValue, (const unsigned char*)&stream[0], stream.size(), 0, libconsensus_flags, nullptr) == expect, message);
         } else {
-            BOOST_CHECK_MESSAGE(bitcoinconsensus_verify_script_with_amount(scriptPubKey.data(), scriptPubKey.size(), 0, (const unsigned char*)&stream[0], stream.size(), 0, libconsensus_flags, NULL) == expect, message);
-            BOOST_CHECK_MESSAGE(bitcoinconsensus_verify_script(scriptPubKey.data(), scriptPubKey.size(), (const unsigned char*)&stream[0], stream.size(), 0, libconsensus_flags, NULL) == expect,message);
+            BOOST_CHECK_MESSAGE(bitcoinconsensus_verify_script_with_amount(scriptPubKey.data(), scriptPubKey.size(), 0, (const unsigned char*)&stream[0], stream.size(), 0, libconsensus_flags, nullptr) == expect, message);
+            BOOST_CHECK_MESSAGE(bitcoinconsensus_verify_script(scriptPubKey.data(), scriptPubKey.size(), (const unsigned char*)&stream[0], stream.size(), 0, libconsensus_flags, nullptr) == expect,message);
         }
     }
 #endif
@@ -450,7 +450,7 @@ class TestBuilder
         return array;
     }
 
-    std::string GetComment()
+    std::string GetComment() const
     {
         return comment;
     }
@@ -1064,18 +1064,18 @@ BOOST_AUTO_TEST_CASE(script_CHECKMULTISIG12)
     CMutableTransaction txTo12 = BuildSpendingTransaction(CScript(), CScriptWitness(), txFrom12);
 
     CScript goodsig1 = sign_multisig(scriptPubKey12, key1, txTo12);
-    BOOST_CHECK(VerifyScript(goodsig1, scriptPubKey12, NULL, gFlags, MutableTransactionSignatureChecker(&txTo12, 0, txFrom12.vout[0].nValue), &err));
+    BOOST_CHECK(VerifyScript(goodsig1, scriptPubKey12, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo12, 0, txFrom12.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
     txTo12.vout[0].nValue = 2;
-    BOOST_CHECK(!VerifyScript(goodsig1, scriptPubKey12, NULL, gFlags, MutableTransactionSignatureChecker(&txTo12, 0, txFrom12.vout[0].nValue), &err));
+    BOOST_CHECK(!VerifyScript(goodsig1, scriptPubKey12, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo12, 0, txFrom12.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
 
     CScript goodsig2 = sign_multisig(scriptPubKey12, key2, txTo12);
-    BOOST_CHECK(VerifyScript(goodsig2, scriptPubKey12, NULL, gFlags, MutableTransactionSignatureChecker(&txTo12, 0, txFrom12.vout[0].nValue), &err));
+    BOOST_CHECK(VerifyScript(goodsig2, scriptPubKey12, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo12, 0, txFrom12.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
 
     CScript badsig1 = sign_multisig(scriptPubKey12, key3, txTo12);
-    BOOST_CHECK(!VerifyScript(badsig1, scriptPubKey12, NULL, gFlags, MutableTransactionSignatureChecker(&txTo12, 0, txFrom12.vout[0].nValue), &err));
+    BOOST_CHECK(!VerifyScript(badsig1, scriptPubKey12, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo12, 0, txFrom12.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
 }
 
@@ -1097,54 +1097,54 @@ BOOST_AUTO_TEST_CASE(script_CHECKMULTISIG23)
     std::vector<CKey> keys;
     keys.push_back(key1); keys.push_back(key2);
     CScript goodsig1 = sign_multisig(scriptPubKey23, keys, txTo23);
-    BOOST_CHECK(VerifyScript(goodsig1, scriptPubKey23, NULL, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
+    BOOST_CHECK(VerifyScript(goodsig1, scriptPubKey23, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
 
     keys.clear();
     keys.push_back(key1); keys.push_back(key3);
     CScript goodsig2 = sign_multisig(scriptPubKey23, keys, txTo23);
-    BOOST_CHECK(VerifyScript(goodsig2, scriptPubKey23, NULL, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
+    BOOST_CHECK(VerifyScript(goodsig2, scriptPubKey23, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
 
     keys.clear();
     keys.push_back(key2); keys.push_back(key3);
     CScript goodsig3 = sign_multisig(scriptPubKey23, keys, txTo23);
-    BOOST_CHECK(VerifyScript(goodsig3, scriptPubKey23, NULL, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
+    BOOST_CHECK(VerifyScript(goodsig3, scriptPubKey23, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
 
     keys.clear();
     keys.push_back(key2); keys.push_back(key2); // Can't re-use sig
     CScript badsig1 = sign_multisig(scriptPubKey23, keys, txTo23);
-    BOOST_CHECK(!VerifyScript(badsig1, scriptPubKey23, NULL, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
+    BOOST_CHECK(!VerifyScript(badsig1, scriptPubKey23, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
 
     keys.clear();
     keys.push_back(key2); keys.push_back(key1); // sigs must be in correct order
     CScript badsig2 = sign_multisig(scriptPubKey23, keys, txTo23);
-    BOOST_CHECK(!VerifyScript(badsig2, scriptPubKey23, NULL, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
+    BOOST_CHECK(!VerifyScript(badsig2, scriptPubKey23, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
 
     keys.clear();
     keys.push_back(key3); keys.push_back(key2); // sigs must be in correct order
     CScript badsig3 = sign_multisig(scriptPubKey23, keys, txTo23);
-    BOOST_CHECK(!VerifyScript(badsig3, scriptPubKey23, NULL, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
+    BOOST_CHECK(!VerifyScript(badsig3, scriptPubKey23, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
 
     keys.clear();
     keys.push_back(key4); keys.push_back(key2); // sigs must match pubkeys
     CScript badsig4 = sign_multisig(scriptPubKey23, keys, txTo23);
-    BOOST_CHECK(!VerifyScript(badsig4, scriptPubKey23, NULL, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
+    BOOST_CHECK(!VerifyScript(badsig4, scriptPubKey23, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
 
     keys.clear();
     keys.push_back(key1); keys.push_back(key4); // sigs must match pubkeys
     CScript badsig5 = sign_multisig(scriptPubKey23, keys, txTo23);
-    BOOST_CHECK(!VerifyScript(badsig5, scriptPubKey23, NULL, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
+    BOOST_CHECK(!VerifyScript(badsig5, scriptPubKey23, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
 
     keys.clear(); // Must have signatures
     CScript badsig6 = sign_multisig(scriptPubKey23, keys, txTo23);
-    BOOST_CHECK(!VerifyScript(badsig6, scriptPubKey23, NULL, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
+    BOOST_CHECK(!VerifyScript(badsig6, scriptPubKey23, nullptr, gFlags, MutableTransactionSignatureChecker(&txTo23, 0, txFrom23.vout[0].nValue), &err));
     BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_INVALID_STACK_OPERATION, ScriptErrorString(err));
 }
 
@@ -1265,7 +1265,7 @@ BOOST_AUTO_TEST_CASE(script_standard_push)
         CScript script;
         script << i;
         BOOST_CHECK_MESSAGE(script.IsPushOnly(), "Number " << i << " is not pure push.");
-        BOOST_CHECK_MESSAGE(VerifyScript(script, CScript() << OP_1, NULL, SCRIPT_VERIFY_MINIMALDATA, BaseSignatureChecker(), &err), "Number " << i << " push is not minimal data.");
+        BOOST_CHECK_MESSAGE(VerifyScript(script, CScript() << OP_1, nullptr, SCRIPT_VERIFY_MINIMALDATA, BaseSignatureChecker(), &err), "Number " << i << " push is not minimal data.");
         BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
     }
 
@@ -1274,7 +1274,7 @@ BOOST_AUTO_TEST_CASE(script_standard_push)
         CScript script;
         script << data;
         BOOST_CHECK_MESSAGE(script.IsPushOnly(), "Length " << i << " is not pure push.");
-        BOOST_CHECK_MESSAGE(VerifyScript(script, CScript() << OP_1, NULL, SCRIPT_VERIFY_MINIMALDATA, BaseSignatureChecker(), &err), "Length " << i << " push is not minimal data.");
+        BOOST_CHECK_MESSAGE(VerifyScript(script, CScript() << OP_1, nullptr, SCRIPT_VERIFY_MINIMALDATA, BaseSignatureChecker(), &err), "Length " << i << " push is not minimal data.");
         BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
     }
 }
@@ -1451,4 +1451,21 @@ BOOST_AUTO_TEST_CASE(script_HasValidOps)
     BOOST_CHECK(!script.HasValidOps());
 }
 
+BOOST_AUTO_TEST_CASE(script_can_append_self)
+{
+    CScript s, d;
+
+    s = ScriptFromHex("00");
+    s += s;
+    d = ScriptFromHex("0000");
+    BOOST_CHECK(s == d);
+
+    // check doubling a script that's large enough to require reallocation
+    static const char hex[] = "04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f";
+    s = CScript() << ParseHex(hex) << OP_CHECKSIG;
+    d = CScript() << ParseHex(hex) << OP_CHECKSIG << ParseHex(hex) << OP_CHECKSIG;
+    s += s;
+    BOOST_CHECK(s == d);
+}
+
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/scriptnum_tests.cpp b/src/test/scriptnum_tests.cpp
index 1d5893bdc..280eb59ce 100644
--- a/src/test/scriptnum_tests.cpp
+++ b/src/test/scriptnum_tests.cpp
@@ -29,10 +29,7 @@ static void CheckCreateVch(const int64_t& num)
     CScriptNum scriptnum(num);
     BOOST_CHECK(verify(bignum, scriptnum));
 
-    std::vector<unsigned char> vch = bignum.getvch();
-
     CScriptNum10 bignum2(bignum.getvch(), false);
-    vch = scriptnum.getvch();
     CScriptNum scriptnum2(scriptnum.getvch(), false);
     BOOST_CHECK(verify(bignum2, scriptnum2));
 
@@ -90,11 +87,10 @@ static void CheckSubtract(const int64_t& num1, const int64_t& num2)
     const CScriptNum10 bignum2(num2);
     const CScriptNum scriptnum1(num1);
     const CScriptNum scriptnum2(num2);
-    bool invalid = false;
 
     // int64_t overflow is undefined.
-    invalid = ((num2 > 0 && num1 < std::numeric_limits<int64_t>::min() + num2) ||
-               (num2 < 0 && num1 > std::numeric_limits<int64_t>::max() + num2));
+    bool invalid = ((num2 > 0 && num1 < std::numeric_limits<int64_t>::min() + num2) ||
+                    (num2 < 0 && num1 > std::numeric_limits<int64_t>::max() + num2));
     if (!invalid)
     {
         BOOST_CHECK(verify(bignum1 - bignum2, scriptnum1 - scriptnum2));
diff --git a/src/test/sighash_tests.cpp b/src/test/sighash_tests.cpp
index 1ca83a7cf..ecbdf5778 100644
--- a/src/test/sighash_tests.cpp
+++ b/src/test/sighash_tests.cpp
@@ -124,11 +124,9 @@ BOOST_AUTO_TEST_CASE(sighash_test)
     #if defined(PRINT_SIGHASH_JSON)
     std::cout << "[\n";
     std::cout << "\t[\"raw_transaction, script, input_index, hashType, signature_hash (result)\"],\n";
-    #endif
+    int nRandomTests = 500;
+    #else
     int nRandomTests = 50000;
-
-    #if defined(PRINT_SIGHASH_JSON)
-    nRandomTests = 500;
     #endif
     for (int i=0; i<nRandomTests; i++) {
         int nHashType = InsecureRand32();
diff --git a/src/test/skiplist_tests.cpp b/src/test/skiplist_tests.cpp
index 77c321cdf..164cbd873 100644
--- a/src/test/skiplist_tests.cpp
+++ b/src/test/skiplist_tests.cpp
@@ -20,7 +20,7 @@ BOOST_AUTO_TEST_CASE(skiplist_test)
 
     for (int i=0; i<SKIPLIST_LENGTH; i++) {
         vIndex[i].nHeight = i;
-        vIndex[i].pprev = (i == 0) ? NULL : &vIndex[i - 1];
+        vIndex[i].pprev = (i == 0) ? nullptr : &vIndex[i - 1];
         vIndex[i].BuildSkip();
     }
 
@@ -29,7 +29,7 @@ BOOST_AUTO_TEST_CASE(skiplist_test)
             BOOST_CHECK(vIndex[i].pskip == &vIndex[vIndex[i].pskip->nHeight]);
             BOOST_CHECK(vIndex[i].pskip->nHeight < i);
         } else {
-            BOOST_CHECK(vIndex[i].pskip == NULL);
+            BOOST_CHECK(vIndex[i].pskip == nullptr);
         }
     }
 
@@ -39,7 +39,7 @@ BOOST_AUTO_TEST_CASE(skiplist_test)
 
         BOOST_CHECK(vIndex[SKIPLIST_LENGTH - 1].GetAncestor(from) == &vIndex[from]);
         BOOST_CHECK(vIndex[from].GetAncestor(to) == &vIndex[to]);
-        BOOST_CHECK(vIndex[from].GetAncestor(0) == &vIndex[0]);
+        BOOST_CHECK(vIndex[from].GetAncestor(0) == vIndex.data());
     }
 }
 
@@ -51,11 +51,11 @@ BOOST_AUTO_TEST_CASE(getlocator_test)
     for (unsigned int i=0; i<vBlocksMain.size(); i++) {
         vHashMain[i] = ArithToUint256(i); // Set the hash equal to the height, so we can quickly check the distances.
         vBlocksMain[i].nHeight = i;
-        vBlocksMain[i].pprev = i ? &vBlocksMain[i - 1] : NULL;
+        vBlocksMain[i].pprev = i ? &vBlocksMain[i - 1] : nullptr;
         vBlocksMain[i].phashBlock = &vHashMain[i];
         vBlocksMain[i].BuildSkip();
         BOOST_CHECK_EQUAL((int)UintToArith256(vBlocksMain[i].GetBlockHash()).GetLow64(), vBlocksMain[i].nHeight);
-        BOOST_CHECK(vBlocksMain[i].pprev == NULL || vBlocksMain[i].nHeight == vBlocksMain[i].pprev->nHeight + 1);
+        BOOST_CHECK(vBlocksMain[i].pprev == nullptr || vBlocksMain[i].nHeight == vBlocksMain[i].pprev->nHeight + 1);
     }
 
     // Build a branch that splits off at block 49999, 50000 blocks long.
@@ -64,11 +64,11 @@ BOOST_AUTO_TEST_CASE(getlocator_test)
     for (unsigned int i=0; i<vBlocksSide.size(); i++) {
         vHashSide[i] = ArithToUint256(i + 50000 + (arith_uint256(1) << 128)); // Add 1<<128 to the hashes, so GetLow64() still returns the height.
         vBlocksSide[i].nHeight = i + 50000;
-        vBlocksSide[i].pprev = i ? &vBlocksSide[i - 1] : &vBlocksMain[49999];
+        vBlocksSide[i].pprev = i ? &vBlocksSide[i - 1] : (vBlocksMain.data()+49999);
         vBlocksSide[i].phashBlock = &vHashSide[i];
         vBlocksSide[i].BuildSkip();
         BOOST_CHECK_EQUAL((int)UintToArith256(vBlocksSide[i].GetBlockHash()).GetLow64(), vBlocksSide[i].nHeight);
-        BOOST_CHECK(vBlocksSide[i].pprev == NULL || vBlocksSide[i].nHeight == vBlocksSide[i].pprev->nHeight + 1);
+        BOOST_CHECK(vBlocksSide[i].pprev == nullptr || vBlocksSide[i].nHeight == vBlocksSide[i].pprev->nHeight + 1);
     }
 
     // Build a CChain for the main branch.
@@ -106,7 +106,7 @@ BOOST_AUTO_TEST_CASE(findearliestatleast_test)
     for (unsigned int i=0; i<vBlocksMain.size(); i++) {
         vHashMain[i] = ArithToUint256(i); // Set the hash equal to the height
         vBlocksMain[i].nHeight = i;
-        vBlocksMain[i].pprev = i ? &vBlocksMain[i - 1] : NULL;
+        vBlocksMain[i].pprev = i ? &vBlocksMain[i - 1] : nullptr;
         vBlocksMain[i].phashBlock = &vHashMain[i];
         vBlocksMain[i].BuildSkip();
         if (i < 10) {
@@ -138,7 +138,7 @@ BOOST_AUTO_TEST_CASE(findearliestatleast_test)
         int64_t test_time = vBlocksMain[r].nTime;
         CBlockIndex *ret = chain.FindEarliestAtLeast(test_time);
         BOOST_CHECK(ret->nTimeMax >= test_time);
-        BOOST_CHECK((ret->pprev==NULL) || ret->pprev->nTimeMax < test_time);
+        BOOST_CHECK((ret->pprev==nullptr) || ret->pprev->nTimeMax < test_time);
         BOOST_CHECK(vBlocksMain[r].GetAncestor(ret->nHeight) == ret);
     }
 }
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
index e2e0a9668..79bc48a11 100644
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -18,12 +18,11 @@
 #include "txdb.h"
 #include "txmempool.h"
 #include "ui_interface.h"
+#include "streams.h"
 #include "rpc/server.h"
 #include "rpc/register.h"
 #include "script/sigcache.h"
 
-#include "test/testutil.h"
-
 #include <memory>
 
 uint256 insecure_rand_seed = GetRandHash();
@@ -50,7 +49,6 @@ BasicTestingSetup::BasicTestingSetup(const std::string& chainName)
 BasicTestingSetup::~BasicTestingSetup()
 {
         ECC_Stop();
-        g_connman.reset();
 }
 
 TestingSetup::TestingSetup(const std::string& chainName) : BasicTestingSetup(chainName)
@@ -61,9 +59,9 @@ TestingSetup::TestingSetup(const std::string& chainName) : BasicTestingSetup(cha
 
         RegisterAllCoreRPCCommands(tableRPC);
         ClearDatadirCache();
-        pathTemp = GetTempPath() / strprintf("test_bitcoin_%lu_%i", (unsigned long)GetTime(), (int)(InsecureRandRange(100000)));
+        pathTemp = fs::temp_directory_path() / strprintf("test_bitcoin_%lu_%i", (unsigned long)GetTime(), (int)(InsecureRandRange(100000)));
         fs::create_directories(pathTemp);
-        ForceSetArg("-datadir", pathTemp.string());
+        gArgs.ForceSetArg("-datadir", pathTemp.string());
 
         // Note that because we don't bother running a scheduler thread here,
         // callbacks via CValidationInterface are unreliable, but that's OK,
@@ -88,16 +86,17 @@ TestingSetup::TestingSetup(const std::string& chainName) : BasicTestingSetup(cha
             threadGroup.create_thread(&ThreadScriptCheck);
         g_connman = std::unique_ptr<CConnman>(new CConnman(0x1337, 0x1337)); // Deterministic randomness for tests.
         connman = g_connman.get();
-        RegisterNodeSignals(GetNodeSignals());
+        peerLogic.reset(new PeerLogicValidation(connman));
 }
 
 TestingSetup::~TestingSetup()
 {
-        UnregisterNodeSignals(GetNodeSignals());
         threadGroup.interrupt_all();
         threadGroup.join_all();
         GetMainSignals().FlushBackgroundCallbacks();
         GetMainSignals().UnregisterBackgroundSignalScheduler();
+        g_connman.reset();
+        peerLogic.reset();
         UnloadBlockIndex();
         delete pcoinsTip;
         delete pcoinsdbview;
@@ -140,7 +139,7 @@ TestChain100Setup::CreateAndProcessBlock(const std::vector<CMutableTransaction>&
     while (!CheckProofOfWork(block.GetHash(), block.nBits, chainparams.GetConsensus())) ++block.nNonce;
 
     std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(block);
-    ProcessNewBlock(chainparams, shared_pblock, true, NULL);
+    ProcessNewBlock(chainparams, shared_pblock, true, nullptr);
 
     CBlock result = block;
     return result;
@@ -160,3 +159,15 @@ CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(const CTransaction &txn) {
     return CTxMemPoolEntry(MakeTransactionRef(txn), nFee, nTime, nHeight,
                            spendsCoinbase, sigOpCost, lp);
 }
+
+/**
+ * @returns a real block (0000000000013b8ab2cd513b0261a14096412195a72a0c4827d229dcc7e0f7af)
+ *      with 9 txs.
+ */
+CBlock getBlock13b8a()
+{
+    CBlock block;
+    CDataStream stream(ParseHex("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"), SER_NETWORK, PROTOCOL_VERSION);
+    stream >> block;
+    return block;
+}
diff --git a/src/test/test_bitcoin.h b/src/test/test_bitcoin.h
index dd3b13c8c..2390aca34 100644
--- a/src/test/test_bitcoin.h
+++ b/src/test/test_bitcoin.h
@@ -41,7 +41,7 @@ static inline bool InsecureRandBool() { return insecure_rand_ctx.randbool(); }
 struct BasicTestingSetup {
     ECCVerifyHandle globalVerifyHandle;
 
-    BasicTestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
+    explicit BasicTestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
     ~BasicTestingSetup();
 };
 
@@ -49,14 +49,16 @@ struct BasicTestingSetup {
  * Included are data directory, coins database, script check threads setup.
  */
 class CConnman;
+class PeerLogicValidation;
 struct TestingSetup: public BasicTestingSetup {
     CCoinsViewDB *pcoinsdbview;
     fs::path pathTemp;
     boost::thread_group threadGroup;
     CConnman* connman;
     CScheduler scheduler;
+    std::unique_ptr<PeerLogicValidation> peerLogic;
 
-    TestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
+    explicit TestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
     ~TestingSetup();
 };
 
@@ -97,7 +99,7 @@ struct TestMemPoolEntryHelper
     TestMemPoolEntryHelper() :
         nFee(0), nTime(0), nHeight(1),
         spendsCoinbase(false), sigOpCost(4) { }
-    
+
     CTxMemPoolEntry FromTx(const CMutableTransaction &tx);
     CTxMemPoolEntry FromTx(const CTransaction &tx);
 
@@ -108,4 +110,7 @@ struct TestMemPoolEntryHelper
     TestMemPoolEntryHelper &SpendsCoinbase(bool _flag) { spendsCoinbase = _flag; return *this; }
     TestMemPoolEntryHelper &SigOpsCost(unsigned int _sigopsCost) { sigOpCost = _sigopsCost; return *this; }
 };
+
+CBlock getBlock13b8a();
+
 #endif
diff --git a/src/test/test_bitcoin_fuzzy.cpp b/src/test/test_bitcoin_fuzzy.cpp
index de1425160..6694c5caa 100644
--- a/src/test/test_bitcoin_fuzzy.cpp
+++ b/src/test/test_bitcoin_fuzzy.cpp
@@ -19,6 +19,7 @@
 #include "undo.h"
 #include "version.h"
 #include "pubkey.h"
+#include "blockencodings.h"
 
 #include <stdint.h>
 #include <unistd.h>
@@ -45,11 +46,13 @@ enum TEST_ID {
     CBLOOMFILTER_DESERIALIZE,
     CDISKBLOCKINDEX_DESERIALIZE,
     CTXOUTCOMPRESSOR_DESERIALIZE,
+    BLOCKTRANSACTIONS_DESERIALIZE,
+    BLOCKTRANSACTIONSREQUEST_DESERIALIZE,
     TEST_ID_END
 };
 
-bool read_stdin(std::vector<char> &data) {
-    char buffer[1024];
+bool read_stdin(std::vector<uint8_t> &data) {
+    uint8_t buffer[1024];
     ssize_t length=0;
     while((length = read(STDIN_FILENO, buffer, 1024)) > 0) {
         data.insert(data.end(), buffer, buffer+length);
@@ -59,15 +62,11 @@ bool read_stdin(std::vector<char> &data) {
     return length==0;
 }
 
-int do_fuzz()
-{
-    std::vector<char> buffer;
-    if (!read_stdin(buffer)) return 0;
-
+int test_one_input(std::vector<uint8_t> buffer) {
     if (buffer.size() < sizeof(uint32_t)) return 0;
 
     uint32_t test_id = 0xffffffff;
-    memcpy(&test_id, &buffer[0], sizeof(uint32_t));
+    memcpy(&test_id, buffer.data(), sizeof(uint32_t));
     buffer.erase(buffer.begin(), buffer.begin() + sizeof(uint32_t));
 
     if (test_id >= TEST_ID_END) return 0;
@@ -249,15 +248,58 @@ int do_fuzz()
 
             break;
         }
+        case BLOCKTRANSACTIONS_DESERIALIZE:
+        {
+            try
+            {
+                BlockTransactions bt;
+                ds >> bt;
+            } catch (const std::ios_base::failure& e) {return 0;}
+
+            break;
+        }
+        case BLOCKTRANSACTIONSREQUEST_DESERIALIZE:
+        {
+            try
+            {
+                BlockTransactionsRequest btr;
+                ds >> btr;
+            } catch (const std::ios_base::failure& e) {return 0;}
+
+            break;
+        }
         default:
             return 0;
     }
     return 0;
 }
 
+static std::unique_ptr<ECCVerifyHandle> globalVerifyHandle;
+void initialize() {
+    globalVerifyHandle = std::unique_ptr<ECCVerifyHandle>(new ECCVerifyHandle());
+}
+
+// This function is used by libFuzzer
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+    test_one_input(std::vector<uint8_t>(data, data + size));
+    return 0;
+}
+
+// This function is used by libFuzzer
+extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
+    initialize();
+    return 0;
+}
+
+// Disabled under WIN32 due to clash with Cygwin's WinMain.
+#ifndef WIN32
+// Declare main(...) "weak" to allow for libFuzzer linking. libFuzzer provides
+// the main(...) function.
+__attribute__((weak))
+#endif
 int main(int argc, char **argv)
 {
-    ECCVerifyHandle globalVerifyHandle;
+    initialize();
 #ifdef __AFL_INIT
     // Enable AFL deferred forkserver mode. Requires compilation using
     // afl-clang-fast++. See fuzzing.md for details.
@@ -267,11 +309,20 @@ int main(int argc, char **argv)
 #ifdef __AFL_LOOP
     // Enable AFL persistent mode. Requires compilation using afl-clang-fast++.
     // See fuzzing.md for details.
+    int ret = 0;
     while (__AFL_LOOP(1000)) {
-        do_fuzz();
+        std::vector<uint8_t> buffer;
+        if (!read_stdin(buffer)) {
+            continue;
+        }
+        ret = test_one_input(buffer);
     }
-    return 0;
+    return ret;
 #else
-    return do_fuzz();
+    std::vector<uint8_t> buffer;
+    if (!read_stdin(buffer)) {
+        return 0;
+    }
+    return test_one_input(buffer);
 #endif
 }
diff --git a/src/test/test_bitcoin_main.cpp b/src/test/test_bitcoin_main.cpp
index 34beef553..b556c953b 100644
--- a/src/test/test_bitcoin_main.cpp
+++ b/src/test/test_bitcoin_main.cpp
@@ -10,14 +10,14 @@
 
 std::unique_ptr<CConnman> g_connman;
 
-void Shutdown(void* parg)
+[[noreturn]] void Shutdown(void* parg)
 {
-  exit(EXIT_SUCCESS);
+  std::exit(EXIT_SUCCESS);
 }
 
-void StartShutdown()
+[[noreturn]] void StartShutdown()
 {
-  exit(EXIT_SUCCESS);
+  std::exit(EXIT_SUCCESS);
 }
 
 bool ShutdownRequested()
diff --git a/src/test/testutil.cpp b/src/test/testutil.cpp
deleted file mode 100644
index 591d0bf30..000000000
--- a/src/test/testutil.cpp
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 2009-2016 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-#include "testutil.h"
-
-#ifdef WIN32
-#include <shlobj.h>
-#endif
-
-#include "fs.h"
-
-fs::path GetTempPath() {
-    return fs::temp_directory_path();
-}
diff --git a/src/test/testutil.h b/src/test/testutil.h
deleted file mode 100644
index cbe784d64..000000000
--- a/src/test/testutil.h
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 2009-2016 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-/**
- * Utility functions shared by unit tests
- */
-#ifndef BITCOIN_TEST_TESTUTIL_H
-#define BITCOIN_TEST_TESTUTIL_H
-
-#include "fs.h"
-
-fs::path GetTempPath();
-
-#endif // BITCOIN_TEST_TESTUTIL_H
diff --git a/src/test/transaction_tests.cpp b/src/test/transaction_tests.cpp
index 6654634bf..cb6ab7cdb 100644
--- a/src/test/transaction_tests.cpp
+++ b/src/test/transaction_tests.cpp
@@ -480,8 +480,7 @@ BOOST_AUTO_TEST_CASE(test_big_witness_transaction) {
 
     for(uint32_t i = 0; i < mtx.vin.size(); i++) {
         std::vector<CScriptCheck> vChecks;
-        const CTxOut& output = coins[tx.vin[i].prevout.n].out;
-        CScriptCheck check(output.scriptPubKey, output.nValue, tx, i, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS, false, &txdata);
+        CScriptCheck check(coins[tx.vin[i].prevout.n].out, tx, i, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS, false, &txdata);
         vChecks.push_back(CScriptCheck());
         check.swap(vChecks.back());
         control.Add(vChecks);
diff --git a/src/test/txvalidationcache_tests.cpp b/src/test/txvalidationcache_tests.cpp
index f609cb1af..82ca93e7d 100644
--- a/src/test/txvalidationcache_tests.cpp
+++ b/src/test/txvalidationcache_tests.cpp
@@ -29,7 +29,8 @@ ToMemPool(CMutableTransaction& tx)
     LOCK(cs_main);
 
     CValidationState state;
-    return AcceptToMemoryPool(mempool, state, MakeTransactionRef(tx), false, NULL, NULL, true, 0);
+    return AcceptToMemoryPool(mempool, state, MakeTransactionRef(tx), nullptr /* pfMissingInputs */,
+                              nullptr /* plTxnReplaced */, true /* bypass_limits */, 0 /* nAbsurdFee */);
 }
 
 BOOST_FIXTURE_TEST_CASE(tx_mempool_block_doublespend, TestChain100Setup)
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 5e9dfb730..6ec544290 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -253,6 +253,31 @@ BOOST_AUTO_TEST_CASE(util_IsHex)
     BOOST_CHECK(!IsHex("0x0000"));
 }
 
+BOOST_AUTO_TEST_CASE(util_IsHexNumber)
+{
+    BOOST_CHECK(IsHexNumber("0x0"));
+    BOOST_CHECK(IsHexNumber("0"));
+    BOOST_CHECK(IsHexNumber("0x10"));
+    BOOST_CHECK(IsHexNumber("10"));
+    BOOST_CHECK(IsHexNumber("0xff"));
+    BOOST_CHECK(IsHexNumber("ff"));
+    BOOST_CHECK(IsHexNumber("0xFfa"));
+    BOOST_CHECK(IsHexNumber("Ffa"));
+    BOOST_CHECK(IsHexNumber("0x00112233445566778899aabbccddeeffAABBCCDDEEFF"));
+    BOOST_CHECK(IsHexNumber("00112233445566778899aabbccddeeffAABBCCDDEEFF"));
+
+    BOOST_CHECK(!IsHexNumber(""));   // empty string not allowed
+    BOOST_CHECK(!IsHexNumber("0x")); // empty string after prefix not allowed
+    BOOST_CHECK(!IsHexNumber("0x0 ")); // no spaces at end,
+    BOOST_CHECK(!IsHexNumber(" 0x0")); // or beginning,
+    BOOST_CHECK(!IsHexNumber("0x 0")); // or middle,
+    BOOST_CHECK(!IsHexNumber(" "));    // etc.
+    BOOST_CHECK(!IsHexNumber("0x0ga")); // invalid character
+    BOOST_CHECK(!IsHexNumber("x0"));    // broken prefix
+    BOOST_CHECK(!IsHexNumber("0x0x00")); // two prefixes not allowed
+
+}
+
 BOOST_AUTO_TEST_CASE(util_seed_insecure_rand)
 {
     SeedInsecureRand(true);
@@ -328,7 +353,7 @@ BOOST_AUTO_TEST_CASE(test_ParseInt32)
 {
     int32_t n;
     // Valid values
-    BOOST_CHECK(ParseInt32("1234", NULL));
+    BOOST_CHECK(ParseInt32("1234", nullptr));
     BOOST_CHECK(ParseInt32("0", &n) && n == 0);
     BOOST_CHECK(ParseInt32("1234", &n) && n == 1234);
     BOOST_CHECK(ParseInt32("01234", &n) && n == 1234); // no octal
@@ -347,17 +372,17 @@ BOOST_AUTO_TEST_CASE(test_ParseInt32)
     std::string teststr(test_bytes, sizeof(test_bytes));
     BOOST_CHECK(!ParseInt32(teststr, &n)); // no embedded NULs
     // Overflow and underflow
-    BOOST_CHECK(!ParseInt32("-2147483649", NULL));
-    BOOST_CHECK(!ParseInt32("2147483648", NULL));
-    BOOST_CHECK(!ParseInt32("-32482348723847471234", NULL));
-    BOOST_CHECK(!ParseInt32("32482348723847471234", NULL));
+    BOOST_CHECK(!ParseInt32("-2147483649", nullptr));
+    BOOST_CHECK(!ParseInt32("2147483648", nullptr));
+    BOOST_CHECK(!ParseInt32("-32482348723847471234", nullptr));
+    BOOST_CHECK(!ParseInt32("32482348723847471234", nullptr));
 }
 
 BOOST_AUTO_TEST_CASE(test_ParseInt64)
 {
     int64_t n;
     // Valid values
-    BOOST_CHECK(ParseInt64("1234", NULL));
+    BOOST_CHECK(ParseInt64("1234", nullptr));
     BOOST_CHECK(ParseInt64("0", &n) && n == 0LL);
     BOOST_CHECK(ParseInt64("1234", &n) && n == 1234LL);
     BOOST_CHECK(ParseInt64("01234", &n) && n == 1234LL); // no octal
@@ -377,17 +402,17 @@ BOOST_AUTO_TEST_CASE(test_ParseInt64)
     std::string teststr(test_bytes, sizeof(test_bytes));
     BOOST_CHECK(!ParseInt64(teststr, &n)); // no embedded NULs
     // Overflow and underflow
-    BOOST_CHECK(!ParseInt64("-9223372036854775809", NULL));
-    BOOST_CHECK(!ParseInt64("9223372036854775808", NULL));
-    BOOST_CHECK(!ParseInt64("-32482348723847471234", NULL));
-    BOOST_CHECK(!ParseInt64("32482348723847471234", NULL));
+    BOOST_CHECK(!ParseInt64("-9223372036854775809", nullptr));
+    BOOST_CHECK(!ParseInt64("9223372036854775808", nullptr));
+    BOOST_CHECK(!ParseInt64("-32482348723847471234", nullptr));
+    BOOST_CHECK(!ParseInt64("32482348723847471234", nullptr));
 }
 
 BOOST_AUTO_TEST_CASE(test_ParseUInt32)
 {
     uint32_t n;
     // Valid values
-    BOOST_CHECK(ParseUInt32("1234", NULL));
+    BOOST_CHECK(ParseUInt32("1234", nullptr));
     BOOST_CHECK(ParseUInt32("0", &n) && n == 0);
     BOOST_CHECK(ParseUInt32("1234", &n) && n == 1234);
     BOOST_CHECK(ParseUInt32("01234", &n) && n == 1234); // no octal
@@ -410,15 +435,15 @@ BOOST_AUTO_TEST_CASE(test_ParseUInt32)
     BOOST_CHECK(!ParseUInt32("-2147483648", &n));
     BOOST_CHECK(!ParseUInt32("4294967296", &n));
     BOOST_CHECK(!ParseUInt32("-1234", &n));
-    BOOST_CHECK(!ParseUInt32("-32482348723847471234", NULL));
-    BOOST_CHECK(!ParseUInt32("32482348723847471234", NULL));
+    BOOST_CHECK(!ParseUInt32("-32482348723847471234", nullptr));
+    BOOST_CHECK(!ParseUInt32("32482348723847471234", nullptr));
 }
 
 BOOST_AUTO_TEST_CASE(test_ParseUInt64)
 {
     uint64_t n;
     // Valid values
-    BOOST_CHECK(ParseUInt64("1234", NULL));
+    BOOST_CHECK(ParseUInt64("1234", nullptr));
     BOOST_CHECK(ParseUInt64("0", &n) && n == 0LL);
     BOOST_CHECK(ParseUInt64("1234", &n) && n == 1234LL);
     BOOST_CHECK(ParseUInt64("01234", &n) && n == 1234LL); // no octal
@@ -438,9 +463,9 @@ BOOST_AUTO_TEST_CASE(test_ParseUInt64)
     std::string teststr(test_bytes, sizeof(test_bytes));
     BOOST_CHECK(!ParseUInt64(teststr, &n)); // no embedded NULs
     // Overflow and underflow
-    BOOST_CHECK(!ParseUInt64("-9223372036854775809", NULL));
-    BOOST_CHECK(!ParseUInt64("18446744073709551616", NULL));
-    BOOST_CHECK(!ParseUInt64("-32482348723847471234", NULL));
+    BOOST_CHECK(!ParseUInt64("-9223372036854775809", nullptr));
+    BOOST_CHECK(!ParseUInt64("18446744073709551616", nullptr));
+    BOOST_CHECK(!ParseUInt64("-32482348723847471234", nullptr));
     BOOST_CHECK(!ParseUInt64("-2147483648", &n));
     BOOST_CHECK(!ParseUInt64("-9223372036854775808", &n));
     BOOST_CHECK(!ParseUInt64("-1234", &n));
@@ -450,7 +475,7 @@ BOOST_AUTO_TEST_CASE(test_ParseDouble)
 {
     double n;
     // Valid values
-    BOOST_CHECK(ParseDouble("1234", NULL));
+    BOOST_CHECK(ParseDouble("1234", nullptr));
     BOOST_CHECK(ParseDouble("0", &n) && n == 0.0);
     BOOST_CHECK(ParseDouble("1234", &n) && n == 1234.0);
     BOOST_CHECK(ParseDouble("01234", &n) && n == 1234.0); // no octal
@@ -470,8 +495,8 @@ BOOST_AUTO_TEST_CASE(test_ParseDouble)
     std::string teststr(test_bytes, sizeof(test_bytes));
     BOOST_CHECK(!ParseDouble(teststr, &n)); // no embedded NULs
     // Overflow and underflow
-    BOOST_CHECK(!ParseDouble("-1e10000", NULL));
-    BOOST_CHECK(!ParseDouble("1e10000", NULL));
+    BOOST_CHECK(!ParseDouble("-1e10000", nullptr));
+    BOOST_CHECK(!ParseDouble("1e10000", nullptr));
 }
 
 BOOST_AUTO_TEST_CASE(test_FormatParagraph)
diff --git a/src/test/versionbits_tests.cpp b/src/test/versionbits_tests.cpp
index 722f6ae05..882afb2e2 100644
--- a/src/test/versionbits_tests.cpp
+++ b/src/test/versionbits_tests.cpp
@@ -69,7 +69,7 @@ class VersionBitsTester
         while (vpblock.size() < height) {
             CBlockIndex* pindex = new CBlockIndex();
             pindex->nHeight = vpblock.size();
-            pindex->pprev = vpblock.size() > 0 ? vpblock.back() : NULL;
+            pindex->pprev = vpblock.size() > 0 ? vpblock.back() : nullptr;
             pindex->nTime = nTime;
             pindex->nVersion = nVersion;
             pindex->BuildSkip();
@@ -81,7 +81,7 @@ class VersionBitsTester
     VersionBitsTester& TestStateSinceHeight(int height) {
         for (int i = 0; i < CHECKERS; i++) {
             if (InsecureRandBits(i) == 0) {
-                BOOST_CHECK_MESSAGE(checker[i].GetStateSinceHeightFor(vpblock.empty() ? NULL : vpblock.back()) == height, strprintf("Test %i for StateSinceHeight", num));
+                BOOST_CHECK_MESSAGE(checker[i].GetStateSinceHeightFor(vpblock.empty() ? nullptr : vpblock.back()) == height, strprintf("Test %i for StateSinceHeight", num));
             }
         }
         num++;
@@ -91,7 +91,7 @@ class VersionBitsTester
     VersionBitsTester& TestDefined() {
         for (int i = 0; i < CHECKERS; i++) {
             if (InsecureRandBits(i) == 0) {
-                BOOST_CHECK_MESSAGE(checker[i].GetStateFor(vpblock.empty() ? NULL : vpblock.back()) == THRESHOLD_DEFINED, strprintf("Test %i for DEFINED", num));
+                BOOST_CHECK_MESSAGE(checker[i].GetStateFor(vpblock.empty() ? nullptr : vpblock.back()) == THRESHOLD_DEFINED, strprintf("Test %i for DEFINED", num));
             }
         }
         num++;
@@ -101,7 +101,7 @@ class VersionBitsTester
     VersionBitsTester& TestStarted() {
         for (int i = 0; i < CHECKERS; i++) {
             if (InsecureRandBits(i) == 0) {
-                BOOST_CHECK_MESSAGE(checker[i].GetStateFor(vpblock.empty() ? NULL : vpblock.back()) == THRESHOLD_STARTED, strprintf("Test %i for STARTED", num));
+                BOOST_CHECK_MESSAGE(checker[i].GetStateFor(vpblock.empty() ? nullptr : vpblock.back()) == THRESHOLD_STARTED, strprintf("Test %i for STARTED", num));
             }
         }
         num++;
@@ -111,7 +111,7 @@ class VersionBitsTester
     VersionBitsTester& TestLockedIn() {
         for (int i = 0; i < CHECKERS; i++) {
             if (InsecureRandBits(i) == 0) {
-                BOOST_CHECK_MESSAGE(checker[i].GetStateFor(vpblock.empty() ? NULL : vpblock.back()) == THRESHOLD_LOCKED_IN, strprintf("Test %i for LOCKED_IN", num));
+                BOOST_CHECK_MESSAGE(checker[i].GetStateFor(vpblock.empty() ? nullptr : vpblock.back()) == THRESHOLD_LOCKED_IN, strprintf("Test %i for LOCKED_IN", num));
             }
         }
         num++;
@@ -121,7 +121,7 @@ class VersionBitsTester
     VersionBitsTester& TestActive() {
         for (int i = 0; i < CHECKERS; i++) {
             if (InsecureRandBits(i) == 0) {
-                BOOST_CHECK_MESSAGE(checker[i].GetStateFor(vpblock.empty() ? NULL : vpblock.back()) == THRESHOLD_ACTIVE, strprintf("Test %i for ACTIVE", num));
+                BOOST_CHECK_MESSAGE(checker[i].GetStateFor(vpblock.empty() ? nullptr : vpblock.back()) == THRESHOLD_ACTIVE, strprintf("Test %i for ACTIVE", num));
             }
         }
         num++;
@@ -131,14 +131,14 @@ class VersionBitsTester
     VersionBitsTester& TestFailed() {
         for (int i = 0; i < CHECKERS; i++) {
             if (InsecureRandBits(i) == 0) {
-                BOOST_CHECK_MESSAGE(checker[i].GetStateFor(vpblock.empty() ? NULL : vpblock.back()) == THRESHOLD_FAILED, strprintf("Test %i for FAILED", num));
+                BOOST_CHECK_MESSAGE(checker[i].GetStateFor(vpblock.empty() ? nullptr : vpblock.back()) == THRESHOLD_FAILED, strprintf("Test %i for FAILED", num));
             }
         }
         num++;
         return *this;
     }
 
-    CBlockIndex * Tip() { return vpblock.size() ? vpblock.back() : NULL; }
+    CBlockIndex * Tip() { return vpblock.size() ? vpblock.back() : nullptr; }
 };
 
 BOOST_FIXTURE_TEST_SUITE(versionbits_tests, TestingSetup)
@@ -255,7 +255,7 @@ BOOST_AUTO_TEST_CASE(versionbits_computeblockversion)
 
     // Before MedianTimePast of the chain has crossed nStartTime, the bit
     // should not be set.
-    CBlockIndex *lastBlock = NULL;
+    CBlockIndex *lastBlock = nullptr;
     lastBlock = firstChain.Mine(2016, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
     BOOST_CHECK_EQUAL(ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit), 0);
 
@@ -314,20 +314,20 @@ BOOST_AUTO_TEST_CASE(versionbits_computeblockversion)
 
     // Mine one period worth of blocks, and check that the bit will be on for the
     // next period.
-    lastBlock = secondChain.Mine(2016, nStartTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
+    lastBlock = secondChain.Mine(2016, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
     BOOST_CHECK((ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit)) != 0);
 
     // Mine another period worth of blocks, signaling the new bit.
-    lastBlock = secondChain.Mine(4032, nStartTime, VERSIONBITS_TOP_BITS | (1<<bit)).Tip();
+    lastBlock = secondChain.Mine(4032, nTime, VERSIONBITS_TOP_BITS | (1<<bit)).Tip();
     // After one period of setting the bit on each block, it should have locked in.
     // We keep setting the bit for one more period though, until activation.
     BOOST_CHECK((ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit)) != 0);
 
     // Now check that we keep mining the block until the end of this period, and
     // then stop at the beginning of the next period.
-    lastBlock = secondChain.Mine(6047, nStartTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
+    lastBlock = secondChain.Mine(6047, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
     BOOST_CHECK((ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit)) != 0);
-    lastBlock = secondChain.Mine(6048, nStartTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
+    lastBlock = secondChain.Mine(6048, nTime, VERSIONBITS_LAST_OLD_BLOCK_VERSION).Tip();
     BOOST_CHECK_EQUAL(ComputeBlockVersion(lastBlock, mainnetParams) & (1<<bit), 0);
 
     // Finally, verify that after a soft fork has activated, CBV no longer uses
diff --git a/src/timedata.cpp b/src/timedata.cpp
index 099ed7f04..5113bb60d 100644
--- a/src/timedata.cpp
+++ b/src/timedata.cpp
@@ -81,7 +81,7 @@ void AddTimeData(const CNetAddr& ip, int64_t nOffsetSample)
         int64_t nMedian = vTimeOffsets.median();
         std::vector<int64_t> vSorted = vTimeOffsets.sorted();
         // Only let other nodes change our time by so much
-        if (abs64(nMedian) <= std::max<int64_t>(0, GetArg("-maxtimeadjustment", DEFAULT_MAX_TIME_ADJUSTMENT)))
+        if (abs64(nMedian) <= std::max<int64_t>(0, gArgs.GetArg("-maxtimeadjustment", DEFAULT_MAX_TIME_ADJUSTMENT)))
         {
             nTimeOffset = nMedian;
         }
diff --git a/src/tinyformat.h b/src/tinyformat.h
index 5022d4680..2e453e56b 100644
--- a/src/tinyformat.h
+++ b/src/tinyformat.h
@@ -167,7 +167,7 @@ namespace tinyformat {
 class format_error: public std::runtime_error
 {
 public:
-    format_error(const std::string &what): std::runtime_error(what) {
+    explicit format_error(const std::string &what): std::runtime_error(what) {
     }
 };
 
@@ -498,7 +498,7 @@ class FormatArg
         FormatArg() {}
 
         template<typename T>
-        FormatArg(const T& value)
+        explicit FormatArg(const T& value)
             : m_value(static_cast<const void*>(&value)),
             m_formatImpl(&formatImpl<T>),
             m_toIntImpl(&toIntImpl<T>)
@@ -867,7 +867,7 @@ class FormatListN : public FormatList
     public:
 #ifdef TINYFORMAT_USE_VARIADIC_TEMPLATES
         template<typename... Args>
-        FormatListN(const Args&... args)
+        explicit FormatListN(const Args&... args)
             : FormatList(&m_formatterStore[0], N),
             m_formatterStore { FormatArg(args)... }
         { static_assert(sizeof...(args) == N, "Number of args must be N"); }
@@ -876,7 +876,7 @@ class FormatListN : public FormatList
 #       define TINYFORMAT_MAKE_FORMATLIST_CONSTRUCTOR(n)       \
                                                                \
         template<TINYFORMAT_ARGTYPES(n)>                       \
-        FormatListN(TINYFORMAT_VARARGS(n))                     \
+        explicit FormatListN(TINYFORMAT_VARARGS(n))            \
             : FormatList(&m_formatterStore[0], n)              \
         { assert(n == N); init(0, TINYFORMAT_PASSARGS(n)); }   \
                                                                \
diff --git a/src/torcontrol.cpp b/src/torcontrol.cpp
index ac13f73e7..1cea19766 100644
--- a/src/torcontrol.cpp
+++ b/src/torcontrol.cpp
@@ -76,7 +76,7 @@ class TorControlConnection
 
     /** Create a new TorControlConnection.
      */
-    TorControlConnection(struct event_base *base);
+    explicit TorControlConnection(struct event_base *base);
     ~TorControlConnection();
 
     /**
@@ -121,7 +121,7 @@ class TorControlConnection
 };
 
 TorControlConnection::TorControlConnection(struct event_base *_base):
-    base(_base), b_conn(0)
+    base(_base), b_conn(nullptr)
 {
 }
 
@@ -138,8 +138,8 @@ void TorControlConnection::readcb(struct bufferevent *bev, void *ctx)
     size_t n_read_out = 0;
     char *line;
     assert(input);
-    //  If there is not a whole line to read, evbuffer_readln returns NULL
-    while((line = evbuffer_readln(input, &n_read_out, EVBUFFER_EOL_CRLF)) != NULL)
+    //  If there is not a whole line to read, evbuffer_readln returns nullptr
+    while((line = evbuffer_readln(input, &n_read_out, EVBUFFER_EOL_CRLF)) != nullptr)
     {
         std::string s(line, n_read_out);
         free(line);
@@ -210,7 +210,7 @@ bool TorControlConnection::Connect(const std::string &target, const ConnectionCB
     b_conn = bufferevent_socket_new(base, -1, BEV_OPT_CLOSE_ON_FREE);
     if (!b_conn)
         return false;
-    bufferevent_setcb(b_conn, TorControlConnection::readcb, NULL, TorControlConnection::eventcb, this);
+    bufferevent_setcb(b_conn, TorControlConnection::readcb, nullptr, TorControlConnection::eventcb, this);
     bufferevent_enable(b_conn, EV_READ|EV_WRITE);
     this->connected = _connected;
     this->disconnected = _disconnected;
@@ -227,7 +227,7 @@ bool TorControlConnection::Disconnect()
 {
     if (b_conn)
         bufferevent_free(b_conn);
-    b_conn = 0;
+    b_conn = nullptr;
     return true;
 }
 
@@ -333,7 +333,7 @@ static std::map<std::string,std::string> ParseTorReplyMapping(const std::string
                         if (j == 3 && value[i] > '3') {
                             j--;
                         }
-                        escaped_value.push_back(strtol(value.substr(i, j).c_str(), NULL, 8));
+                        escaped_value.push_back(strtol(value.substr(i, j).c_str(), nullptr, 8));
                         // Account for automatic incrementing at loop end
                         i += j - 1;
                     } else {
@@ -367,7 +367,7 @@ static std::map<std::string,std::string> ParseTorReplyMapping(const std::string
 static std::pair<bool,std::string> ReadBinaryFile(const fs::path &filename, size_t maxsize=std::numeric_limits<size_t>::max())
 {
     FILE *f = fsbridge::fopen(filename, "rb");
-    if (f == NULL)
+    if (f == nullptr)
         return std::make_pair(false,"");
     std::string retval;
     char buffer[128];
@@ -393,7 +393,7 @@ static std::pair<bool,std::string> ReadBinaryFile(const fs::path &filename, size
 static bool WriteBinaryFile(const fs::path &filename, const std::string &data)
 {
     FILE *f = fsbridge::fopen(filename, "wb");
-    if (f == NULL)
+    if (f == nullptr)
         return false;
     if (fwrite(data.data(), 1, data.size(), f) != data.size()) {
         fclose(f);
@@ -476,7 +476,7 @@ TorController::~TorController()
 {
     if (reconnect_ev) {
         event_free(reconnect_ev);
-        reconnect_ev = 0;
+        reconnect_ev = nullptr;
     }
     if (service.IsValid()) {
         RemoveLocal(service);
@@ -525,7 +525,7 @@ void TorController::auth_cb(TorControlConnection& _conn, const TorControlReply&
 
         // Now that we know Tor is running setup the proxy for onion addresses
         // if -onion isn't set to something else.
-        if (GetArg("-onion", "") == "") {
+        if (gArgs.GetArg("-onion", "") == "") {
             CService resolved(LookupNumeric("127.0.0.1", 9050));
             proxyType addrOnion = proxyType(resolved, true);
             SetProxy(NET_TOR, addrOnion);
@@ -642,7 +642,7 @@ void TorController::protocolinfo_cb(TorControlConnection& _conn, const TorContro
          *   cookie:   hex-encoded ~/.tor/control_auth_cookie
          *   password: "password"
          */
-        std::string torpassword = GetArg("-torpassword", "");
+        std::string torpassword = gArgs.GetArg("-torpassword", "");
         if (!torpassword.empty()) {
             if (methods.count("HASHEDPASSWORD")) {
                 LogPrint(BCLog::TOR, "tor: Using HASHEDPASSWORD authentication\n");
@@ -735,7 +735,7 @@ static boost::thread torControlThread;
 
 static void TorControlThread()
 {
-    TorController ctrl(gBase, GetArg("-torcontrol", DEFAULT_TOR_CONTROL));
+    TorController ctrl(gBase, gArgs.GetArg("-torcontrol", DEFAULT_TOR_CONTROL));
 
     event_base_dispatch(gBase);
 }
@@ -770,7 +770,7 @@ void StopTorControl()
     if (gBase) {
         torControlThread.join();
         event_base_free(gBase);
-        gBase = 0;
+        gBase = nullptr;
     }
 }
 
diff --git a/src/txdb.cpp b/src/txdb.cpp
index 7f7eb6567..134bb8721 100644
--- a/src/txdb.cpp
+++ b/src/txdb.cpp
@@ -35,7 +35,7 @@ namespace {
 struct CoinEntry {
     COutPoint* outpoint;
     char key;
-    CoinEntry(const COutPoint* ptr) : outpoint(const_cast<COutPoint*>(ptr)), key(DB_COIN)  {}
+    explicit CoinEntry(const COutPoint* ptr) : outpoint(const_cast<COutPoint*>(ptr)), key(DB_COIN)  {}
 
     template<typename Stream>
     void Serialize(Stream &s) const {
@@ -85,8 +85,8 @@ bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) {
     CDBBatch batch(db);
     size_t count = 0;
     size_t changed = 0;
-    size_t batch_size = (size_t)GetArg("-dbbatchsize", nDefaultDbBatchSize);
-    int crash_simulate = GetArg("-dbcrashratio", 0);
+    size_t batch_size = (size_t)gArgs.GetArg("-dbbatchsize", nDefaultDbBatchSize);
+    int crash_simulate = gArgs.GetArg("-dbcrashratio", 0);
     assert(!hashBlock.IsNull());
 
     uint256 old_tip = GetBestBlock();
@@ -371,9 +371,9 @@ bool CCoinsViewDB::Upgrade() {
     int64_t count = 0;
     LogPrintf("Upgrading utxo-set database...\n");
     LogPrintf("[0%%]...");
+    uiInterface.ShowProgress(_("Upgrading UTXO database"), 0, true);
     size_t batch_size = 1 << 24;
     CDBBatch batch(db);
-    uiInterface.SetProgressBreakAction(StartShutdown);
     int reportDone = 0;
     std::pair<unsigned char, uint256> key;
     std::pair<unsigned char, uint256> prev_key = {DB_COINS, uint256()};
@@ -386,7 +386,7 @@ bool CCoinsViewDB::Upgrade() {
             if (count++ % 256 == 0) {
                 uint32_t high = 0x100 * *key.second.begin() + *(key.second.begin() + 1);
                 int percentageDone = (int)(high * 100.0 / 65536.0 + 0.5);
-                uiInterface.ShowProgress(_("Upgrading UTXO database") + "\n"+ _("(press q to shutdown and continue later)") + "\n", percentageDone);
+                uiInterface.ShowProgress(_("Upgrading UTXO database"), percentageDone, true);
                 if (reportDone < percentageDone/10) {
                     // report max. every 10% step
                     LogPrintf("[%d%%]...", percentageDone);
@@ -420,7 +420,7 @@ bool CCoinsViewDB::Upgrade() {
     }
     db.WriteBatch(batch);
     db.CompactRange({DB_COINS, uint256()}, key);
-    uiInterface.SetProgressBreakAction(std::function<void(void)>());
+    uiInterface.ShowProgress("", 100, false);
     LogPrintf("[%s].\n", ShutdownRequested() ? "CANCELLED" : "DONE");
     return !ShutdownRequested();
 }
diff --git a/src/txdb.h b/src/txdb.h
index adcbc7338..ec9f571b1 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -64,12 +64,12 @@ struct CDiskTxPos : public CDiskBlockPos
 };
 
 /** CCoinsView backed by the coin database (chainstate/) */
-class CCoinsViewDB : public CCoinsView
+class CCoinsViewDB final : public CCoinsView
 {
 protected:
     CDBWrapper db;
 public:
-    CCoinsViewDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
+    explicit CCoinsViewDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
 
     bool GetCoin(const COutPoint &outpoint, Coin &coin) const override;
     bool HaveCoin(const COutPoint &outpoint) const override;
@@ -109,18 +109,18 @@ class CCoinsViewDBCursor: public CCoinsViewCursor
 class CBlockTreeDB : public CDBWrapper
 {
 public:
-    CBlockTreeDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
-private:
-    CBlockTreeDB(const CBlockTreeDB&);
-    void operator=(const CBlockTreeDB&);
-public:
+    explicit CBlockTreeDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
+
+    CBlockTreeDB(const CBlockTreeDB&) = delete;
+    CBlockTreeDB& operator=(const CBlockTreeDB&) = delete;
+
     bool WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*> >& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo);
-    bool ReadBlockFileInfo(int nFile, CBlockFileInfo &fileinfo);
+    bool ReadBlockFileInfo(int nFile, CBlockFileInfo &info);
     bool ReadLastBlockFile(int &nFile);
-    bool WriteReindexing(bool fReindex);
-    bool ReadReindexing(bool &fReindex);
+    bool WriteReindexing(bool fReindexing);
+    bool ReadReindexing(bool &fReindexing);
     bool ReadTxIndex(const uint256 &txid, CDiskTxPos &pos);
-    bool WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> > &list);
+    bool WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> > &vect);
     bool WriteFlag(const std::string &name, bool fValue);
     bool ReadFlag(const std::string &name, bool &fValue);
     bool LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex);
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 4a8105523..b0306811c 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -39,11 +39,6 @@ CTxMemPoolEntry::CTxMemPoolEntry(const CTransactionRef& _tx, const CAmount& _nFe
     nSigOpCostWithAncestors = sigOpCost;
 }
 
-CTxMemPoolEntry::CTxMemPoolEntry(const CTxMemPoolEntry& other)
-{
-    *this = other;
-}
-
 void CTxMemPoolEntry::UpdateFeeDelta(int64_t newFeeDelta)
 {
     nModFeesWithDescendants += newFeeDelta - feeDelta;
@@ -612,6 +607,15 @@ void CTxMemPool::clear()
     _clear();
 }
 
+static void CheckInputsAndUpdateCoins(const CTransaction& tx, CCoinsViewCache& mempoolDuplicate, const int64_t spendheight)
+{
+    CValidationState state;
+    CAmount txfee = 0;
+    bool fCheckResult = tx.IsCoinBase() || Consensus::CheckTxInputs(tx, state, mempoolDuplicate, spendheight, txfee);
+    assert(fCheckResult);
+    UpdateCoins(tx, mempoolDuplicate, 1000000);
+}
+
 void CTxMemPool::check(const CCoinsViewCache *pcoins) const
 {
     if (nCheckFrequency == 0)
@@ -626,7 +630,7 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
     uint64_t innerUsage = 0;
 
     CCoinsViewCache mempoolDuplicate(const_cast<CCoinsViewCache*>(pcoins));
-    const int64_t nSpendHeight = GetSpendHeight(mempoolDuplicate);
+    const int64_t spendheight = GetSpendHeight(mempoolDuplicate);
 
     LOCK(cs);
     std::list<const CTxMemPoolEntry*> waitingOnDependants;
@@ -705,11 +709,7 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
         if (fDependsWait)
             waitingOnDependants.push_back(&(*it));
         else {
-            CValidationState state;
-            bool fCheckResult = tx.IsCoinBase() ||
-                Consensus::CheckTxInputs(tx, state, mempoolDuplicate, nSpendHeight);
-            assert(fCheckResult);
-            UpdateCoins(tx, mempoolDuplicate, 1000000);
+            CheckInputsAndUpdateCoins(tx, mempoolDuplicate, spendheight);
         }
     }
     unsigned int stepsSinceLastRemove = 0;
@@ -722,10 +722,7 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
             stepsSinceLastRemove++;
             assert(stepsSinceLastRemove < waitingOnDependants.size());
         } else {
-            bool fCheckResult = entry->GetTx().IsCoinBase() ||
-                Consensus::CheckTxInputs(entry->GetTx(), state, mempoolDuplicate, nSpendHeight);
-            assert(fCheckResult);
-            UpdateCoins(entry->GetTx(), mempoolDuplicate, 1000000);
+            CheckInputsAndUpdateCoins(entry->GetTx(), mempoolDuplicate, spendheight);
             stepsSinceLastRemove = 0;
         }
     }
@@ -986,7 +983,7 @@ const CTxMemPool::setEntries & CTxMemPool::GetMemPoolChildren(txiter entry) cons
 CFeeRate CTxMemPool::GetMinFee(size_t sizelimit) const {
     LOCK(cs);
     if (!blockSinceLastRollingFeeBump || rollingMinimumFeeRate == 0)
-        return CFeeRate(rollingMinimumFeeRate);
+        return CFeeRate(llround(rollingMinimumFeeRate));
 
     int64_t time = GetTime();
     if (time > lastRollingFeeUpdate + 10) {
@@ -1004,7 +1001,7 @@ CFeeRate CTxMemPool::GetMinFee(size_t sizelimit) const {
             return CFeeRate(0);
         }
     }
-    return std::max(CFeeRate(rollingMinimumFeeRate), incrementalRelayFee);
+    return std::max(CFeeRate(llround(rollingMinimumFeeRate)), incrementalRelayFee);
 }
 
 void CTxMemPool::trackPackageRemoved(const CFeeRate& rate) {
diff --git a/src/txmempool.h b/src/txmempool.h
index d272114a7..929d22358 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -21,11 +21,10 @@
 #include "sync.h"
 #include "random.h"
 
-#include "boost/multi_index_container.hpp"
-#include "boost/multi_index/ordered_index.hpp"
-#include "boost/multi_index/hashed_index.hpp"
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/hashed_index.hpp>
+#include <boost/multi_index/ordered_index.hpp>
 #include <boost/multi_index/sequenced_index.hpp>
-
 #include <boost/signals2/signal.hpp>
 
 class CBlockIndex;
@@ -45,7 +44,7 @@ struct LockPoints
     // values are still valid even after a reorg.
     CBlockIndex* maxInputBlock;
 
-    LockPoints() : height(0), time(0), maxInputBlock(NULL) { }
+    LockPoints() : height(0), time(0), maxInputBlock(nullptr) { }
 };
 
 class CTxMemPool;
@@ -95,8 +94,6 @@ class CTxMemPoolEntry
                     bool spendsCoinbase,
                     int64_t nSigOpsCost, LockPoints lp);
 
-    CTxMemPoolEntry(const CTxMemPoolEntry& other);
-
     const CTransaction& GetTx() const { return *this->tx; }
     CTransactionRef GetSharedTx() const { return this->tx; }
     const CAmount& GetFee() const { return nFee; }
@@ -167,7 +164,7 @@ struct update_ancestor_state
 
 struct update_fee_delta
 {
-    update_fee_delta(int64_t _feeDelta) : feeDelta(_feeDelta) { }
+    explicit update_fee_delta(int64_t _feeDelta) : feeDelta(_feeDelta) { }
 
     void operator() (CTxMemPoolEntry &e) { e.UpdateFeeDelta(feeDelta); }
 
@@ -177,7 +174,7 @@ struct update_fee_delta
 
 struct update_lock_points
 {
-    update_lock_points(const LockPoints& _lp) : lp(_lp) { }
+    explicit update_lock_points(const LockPoints& _lp) : lp(_lp) { }
 
     void operator() (CTxMemPoolEntry &e) { e.UpdateLockPoints(lp); }
 
@@ -501,7 +498,7 @@ class CTxMemPool
 
     /** Create a new CTxMemPool.
      */
-    CTxMemPool(CBlockPolicyEstimator* estimator = nullptr);
+    explicit CTxMemPool(CBlockPolicyEstimator* estimator = nullptr);
 
     /**
      * If sanity-checking is turned on, check makes sure the pool is
@@ -510,7 +507,7 @@ class CTxMemPool
      * check does nothing.
      */
     void check(const CCoinsViewCache *pcoins) const;
-    void setSanityCheck(double dFrequency = 1.0) { nCheckFrequency = dFrequency * 4294967295.0; }
+    void setSanityCheck(double dFrequency = 1.0) { nCheckFrequency = static_cast<uint32_t>(dFrequency * 4294967295.0); }
 
     // addUnchecked must updated state for all ancestors of a given transaction,
     // to track size/count of descendant transactions.  First version of
@@ -592,7 +589,7 @@ class CTxMemPool
       *  pvNoSpendsRemaining, if set, will be populated with the list of outpoints
       *  which are not in mempool which no longer have any spends in this mempool.
       */
-    void TrimToSize(size_t sizelimit, std::vector<COutPoint>* pvNoSpendsRemaining=NULL);
+    void TrimToSize(size_t sizelimit, std::vector<COutPoint>* pvNoSpendsRemaining=nullptr);
 
     /** Expire all transaction (and their dependencies) in the mempool older than time. Return the number of removed transactions. */
     int Expire(int64_t time);
@@ -606,7 +603,7 @@ class CTxMemPool
         return mapTx.size();
     }
 
-    uint64_t GetTotalTxSize()
+    uint64_t GetTotalTxSize() const
     {
         LOCK(cs);
         return totalTxSize;
diff --git a/src/ui_interface.h b/src/ui_interface.h
index 762dd19b1..7f68c578e 100644
--- a/src/ui_interface.h
+++ b/src/ui_interface.h
@@ -94,11 +94,11 @@ class CClientUIInterface
     /** A wallet has been loaded. */
     boost::signals2::signal<void (CWallet* wallet)> LoadWallet;
 
-    /** Show progress e.g. for verifychain */
-    boost::signals2::signal<void (const std::string &title, int nProgress)> ShowProgress;
-
-    /** Set progress break action (possible "cancel button" triggers that action) */
-    boost::signals2::signal<void (std::function<void(void)> action)> SetProgressBreakAction;
+    /**
+     * Show progress e.g. for verifychain.
+     * resume_possible indicates shutting down now will result in the current progress action resuming upon restart.
+     */
+    boost::signals2::signal<void (const std::string &title, int nProgress, bool resume_possible)> ShowProgress;
 
     /** New block has been accepted */
     boost::signals2::signal<void (bool, const CBlockIndex *)> NotifyBlockTip;
diff --git a/src/uint256.cpp b/src/uint256.cpp
index c4c7b716f..736a0d4fe 100644
--- a/src/uint256.cpp
+++ b/src/uint256.cpp
@@ -14,7 +14,7 @@ template <unsigned int BITS>
 base_blob<BITS>::base_blob(const std::vector<unsigned char>& vch)
 {
     assert(vch.size() == sizeof(data));
-    memcpy(data, &vch[0], sizeof(data));
+    memcpy(data, vch.data(), sizeof(data));
 }
 
 template <unsigned int BITS>
diff --git a/src/uint256.h b/src/uint256.h
index a92ce07f1..94a4f7fc3 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -111,7 +111,6 @@ class base_blob
 class uint160 : public base_blob<160> {
 public:
     uint160() {}
-    uint160(const base_blob<160>& b) : base_blob<160>(b) {}
     explicit uint160(const std::vector<unsigned char>& vch) : base_blob<160>(vch) {}
 };
 
@@ -123,7 +122,6 @@ class uint160 : public base_blob<160> {
 class uint256 : public base_blob<256> {
 public:
     uint256() {}
-    uint256(const base_blob<256>& b) : base_blob<256>(b) {}
     explicit uint256(const std::vector<unsigned char>& vch) : base_blob<256>(vch) {}
 
     /** A cheap hash function that just returns 64 bits from the result, it can be
diff --git a/src/undo.h b/src/undo.h
index 0f9d041bb..a720de4ac 100644
--- a/src/undo.h
+++ b/src/undo.h
@@ -33,7 +33,7 @@ class TxInUndoSerializer
         ::Serialize(s, CTxOutCompressor(REF(txout->out)));
     }
 
-    TxInUndoSerializer(const Coin* coin) : txout(coin) {}
+    explicit TxInUndoSerializer(const Coin* coin) : txout(coin) {}
 };
 
 class TxInUndoDeserializer
@@ -57,7 +57,7 @@ class TxInUndoDeserializer
         ::Unserialize(s, REF(CTxOutCompressor(REF(txout->out))));
     }
 
-    TxInUndoDeserializer(Coin* coin) : txout(coin) {}
+    explicit TxInUndoDeserializer(Coin* coin) : txout(coin) {}
 };
 
 static const size_t MIN_TRANSACTION_INPUT_WEIGHT = WITNESS_SCALE_FACTOR * ::GetSerializeSize(CTxIn(), SER_NETWORK, PROTOCOL_VERSION);
diff --git a/src/univalue/Makefile.am b/src/univalue/Makefile.am
index 6c1ec81e6..e283fc890 100644
--- a/src/univalue/Makefile.am
+++ b/src/univalue/Makefile.am
@@ -12,6 +12,7 @@ pkgconfig_DATA = pc/libunivalue.pc
 
 libunivalue_la_SOURCES = \
 	lib/univalue.cpp \
+	lib/univalue_get.cpp \
 	lib/univalue_read.cpp \
 	lib/univalue_write.cpp
 
@@ -20,7 +21,7 @@ libunivalue_la_LDFLAGS = \
 	-no-undefined
 libunivalue_la_CXXFLAGS = -I$(top_srcdir)/include
 
-TESTS = test/unitester
+TESTS = test/object test/unitester test/no_nul
 
 GENBIN = gen/gen$(BUILD_EXEEXT)
 GEN_SRCS = gen/gen.cpp
@@ -33,7 +34,7 @@ gen: lib/univalue_escapes.h $(GENBIN)
 	@echo Updating $<
 	$(AM_V_at)$(GENBIN) > lib/univalue_escapes.h
 
-noinst_PROGRAMS = $(TESTS)
+noinst_PROGRAMS = $(TESTS) test/test_json
 
 TEST_DATA_DIR=test
 
@@ -42,6 +43,21 @@ test_unitester_LDADD = libunivalue.la
 test_unitester_CXXFLAGS = -I$(top_srcdir)/include -DJSON_TEST_SRC=\"$(srcdir)/$(TEST_DATA_DIR)\"
 test_unitester_LDFLAGS = -static $(LIBTOOL_APP_LDFLAGS)
 
+test_test_json_SOURCES = test/test_json.cpp
+test_test_json_LDADD = libunivalue.la
+test_test_json_CXXFLAGS = -I$(top_srcdir)/include
+test_test_json_LDFLAGS = -static $(LIBTOOL_APP_LDFLAGS)
+
+test_no_nul_SOURCES = test/no_nul.cpp
+test_no_nul_LDADD = libunivalue.la
+test_no_nul_CXXFLAGS = -I$(top_srcdir)/include
+test_no_nul_LDFLAGS = -static $(LIBTOOL_APP_LDFLAGS)
+
+test_object_SOURCES = test/object.cpp
+test_object_LDADD = libunivalue.la
+test_object_CXXFLAGS = -I$(top_srcdir)/include
+test_object_LDFLAGS = -static $(LIBTOOL_APP_LDFLAGS)
+
 TEST_FILES = \
 	$(TEST_DATA_DIR)/fail10.json \
 	$(TEST_DATA_DIR)/fail11.json \
@@ -77,6 +93,8 @@ TEST_FILES = \
 	$(TEST_DATA_DIR)/fail39.json \
 	$(TEST_DATA_DIR)/fail40.json \
 	$(TEST_DATA_DIR)/fail41.json \
+	$(TEST_DATA_DIR)/fail42.json \
+	$(TEST_DATA_DIR)/fail44.json \
 	$(TEST_DATA_DIR)/fail3.json \
 	$(TEST_DATA_DIR)/fail4.json \
 	$(TEST_DATA_DIR)/fail5.json \
@@ -88,6 +106,11 @@ TEST_FILES = \
 	$(TEST_DATA_DIR)/pass2.json \
 	$(TEST_DATA_DIR)/pass3.json \
 	$(TEST_DATA_DIR)/round1.json \
-	$(TEST_DATA_DIR)/round2.json
+	$(TEST_DATA_DIR)/round2.json \
+	$(TEST_DATA_DIR)/round3.json \
+	$(TEST_DATA_DIR)/round4.json \
+	$(TEST_DATA_DIR)/round5.json \
+	$(TEST_DATA_DIR)/round6.json \
+	$(TEST_DATA_DIR)/round7.json
 
 EXTRA_DIST=$(TEST_FILES) $(GEN_SRCS)
diff --git a/src/univalue/README b/src/univalue/README
deleted file mode 100644
index 48167b083..000000000
--- a/src/univalue/README
+++ /dev/null
@@ -1,7 +0,0 @@
-
-		UniValue
-
-A universal value object, with JSON encoding (output) and decoding (input).
-
-Built as a single dynamic RAII C++ object class, and no templates.
-
diff --git a/src/univalue/README.md b/src/univalue/README.md
new file mode 100644
index 000000000..36aa786a4
--- /dev/null
+++ b/src/univalue/README.md
@@ -0,0 +1,32 @@
+
+# UniValue
+
+## Summary
+
+A universal value class, with JSON encoding and decoding.
+
+UniValue is an abstract data type that may be a null, boolean, string,
+number, array container, or a key/value dictionary container, nested to
+an arbitrary depth.
+
+This class is aligned with the JSON standard, [RFC
+7159](https://tools.ietf.org/html/rfc7159.html).
+
+## Installation
+
+This project is a standard GNU
+[autotools](https://www.gnu.org/software/automake/manual/html_node/Autotools-Introduction.html)
+project.  Build and install instructions are available in the `INSTALL`
+file provided with GNU autotools.
+
+```
+$ ./autogen.sh
+$ ./configure
+$ make
+```
+
+## Design
+
+UniValue provides a single dynamic RAII C++ object class,
+and minimizes template use (contra json_spirit).
+
diff --git a/src/univalue/configure.ac b/src/univalue/configure.ac
index 93d3ba945..8298332ac 100644
--- a/src/univalue/configure.ac
+++ b/src/univalue/configure.ac
@@ -1,7 +1,7 @@
 m4_define([libunivalue_major_version], [1])
 m4_define([libunivalue_minor_version], [1])
-m4_define([libunivalue_micro_version], [2])
-m4_define([libunivalue_interface_age], [2])
+m4_define([libunivalue_micro_version], [3])
+m4_define([libunivalue_interface_age], [3])
 # If you need a modifier for the version number. 
 # Normally empty, but can be used to make "fixup" releases.
 m4_define([libunivalue_extraversion], [])
@@ -14,7 +14,7 @@ m4_define([libunivalue_age], [m4_eval(libunivalue_binary_age - libunivalue_inter
 m4_define([libunivalue_version], [libunivalue_major_version().libunivalue_minor_version().libunivalue_micro_version()libunivalue_extraversion()])
 
 
-AC_INIT([univalue], [1.0.2],
+AC_INIT([univalue], [1.0.3],
         [http://github.com/jgarzik/univalue/])
 
 dnl make the compilation flags quiet unless V=1 is used
diff --git a/src/univalue/include/univalue.h b/src/univalue/include/univalue.h
index e8ce28351..4fd2223b3 100644
--- a/src/univalue/include/univalue.h
+++ b/src/univalue/include/univalue.h
@@ -7,6 +7,7 @@
 #define __UNIVALUE_H__
 
 #include <stdint.h>
+#include <string.h>
 
 #include <string>
 #include <vector>
@@ -69,10 +70,11 @@ class UniValue {
     size_t size() const { return values.size(); }
 
     bool getBool() const { return isTrue(); }
-    bool checkObject(const std::map<std::string,UniValue::VType>& memberTypes);
+    void getObjMap(std::map<std::string,UniValue>& kv) const;
+    bool checkObject(const std::map<std::string,UniValue::VType>& memberTypes) const;
     const UniValue& operator[](const std::string& key) const;
-    const UniValue& operator[](unsigned int index) const;
-    bool exists(const std::string& key) const { return (findKey(key) >= 0); }
+    const UniValue& operator[](size_t index) const;
+    bool exists(const std::string& key) const { size_t i; return findKey(key, i); }
 
     bool isNull() const { return (typ == VNULL); }
     bool isTrue() const { return (typ == VBOOL) && (val == "1"); }
@@ -92,8 +94,25 @@ class UniValue {
         std::string s(val_);
         return push_back(s);
     }
+    bool push_back(uint64_t val_) {
+        UniValue tmpVal(val_);
+        return push_back(tmpVal);
+    }
+    bool push_back(int64_t val_) {
+        UniValue tmpVal(val_);
+        return push_back(tmpVal);
+    }
+    bool push_back(int val_) {
+        UniValue tmpVal(val_);
+        return push_back(tmpVal);
+    }
+    bool push_back(double val_) {
+        UniValue tmpVal(val_);
+        return push_back(tmpVal);
+    }
     bool push_backV(const std::vector<UniValue>& vec);
 
+    void __pushKV(const std::string& key, const UniValue& val);
     bool pushKV(const std::string& key, const UniValue& val);
     bool pushKV(const std::string& key, const std::string& val_) {
         UniValue tmpVal(VSTR, val_);
@@ -124,9 +143,10 @@ class UniValue {
     std::string write(unsigned int prettyIndent = 0,
                       unsigned int indentLevel = 0) const;
 
-    bool read(const char *raw);
+    bool read(const char *raw, size_t len);
+    bool read(const char *raw) { return read(raw, strlen(raw)); }
     bool read(const std::string& rawStr) {
-        return read(rawStr.c_str());
+        return read(rawStr.data(), rawStr.size());
     }
 
 private:
@@ -135,7 +155,7 @@ class UniValue {
     std::vector<std::string> keys;
     std::vector<UniValue> values;
 
-    int findKey(const std::string& key) const;
+    bool findKey(const std::string& key, size_t& retIdx) const;
     void writeArray(unsigned int prettyIndent, unsigned int indentLevel, std::string& s) const;
     void writeObject(unsigned int prettyIndent, unsigned int indentLevel, std::string& s) const;
 
@@ -240,7 +260,7 @@ enum jtokentype {
 };
 
 extern enum jtokentype getJsonToken(std::string& tokenVal,
-                                    unsigned int& consumed, const char *raw);
+                                    unsigned int& consumed, const char *raw, const char *end);
 extern const char *uvTypeName(UniValue::VType t);
 
 static inline bool jsonTokenIsValue(enum jtokentype jtt)
diff --git a/src/univalue/lib/univalue.cpp b/src/univalue/lib/univalue.cpp
index 5a2860c13..d8ad7c4b9 100644
--- a/src/univalue/lib/univalue.cpp
+++ b/src/univalue/lib/univalue.cpp
@@ -4,75 +4,12 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <stdint.h>
-#include <errno.h>
 #include <iomanip>
-#include <limits>
 #include <sstream>
-#include <stdexcept>
 #include <stdlib.h>
-#include <string.h>
 
 #include "univalue.h"
 
-namespace 
-{
-static bool ParsePrechecks(const std::string& str)
-{
-    if (str.empty()) // No empty string allowed
-        return false;
-    if (str.size() >= 1 && (json_isspace(str[0]) || json_isspace(str[str.size()-1]))) // No padding allowed
-        return false;
-    if (str.size() != strlen(str.c_str())) // No embedded NUL characters allowed
-        return false;
-    return true;
-}
-
-bool ParseInt32(const std::string& str, int32_t *out)
-{
-    if (!ParsePrechecks(str))
-        return false;
-    char *endp = NULL;
-    errno = 0; // strtol will not set errno if valid
-    long int n = strtol(str.c_str(), &endp, 10);
-    if(out) *out = (int32_t)n;
-    // Note that strtol returns a *long int*, so even if strtol doesn't report a over/underflow
-    // we still have to check that the returned value is within the range of an *int32_t*. On 64-bit
-    // platforms the size of these types may be different.
-    return endp && *endp == 0 && !errno &&
-        n >= std::numeric_limits<int32_t>::min() &&
-        n <= std::numeric_limits<int32_t>::max();
-}
-
-bool ParseInt64(const std::string& str, int64_t *out)
-{
-    if (!ParsePrechecks(str))
-        return false;
-    char *endp = NULL;
-    errno = 0; // strtoll will not set errno if valid
-    long long int n = strtoll(str.c_str(), &endp, 10);
-    if(out) *out = (int64_t)n;
-    // Note that strtoll returns a *long long int*, so even if strtol doesn't report a over/underflow
-    // we still have to check that the returned value is within the range of an *int64_t*.
-    return endp && *endp == 0 && !errno &&
-        n >= std::numeric_limits<int64_t>::min() &&
-        n <= std::numeric_limits<int64_t>::max();
-}
-
-bool ParseDouble(const std::string& str, double *out)
-{
-    if (!ParsePrechecks(str))
-        return false;
-    if (str.size() >= 2 && str[0] == '0' && str[1] == 'x') // No hexadecimal floats allowed
-        return false;
-    std::istringstream text(str);
-    text.imbue(std::locale::classic());
-    double result;
-    text >> result;
-    if(out) *out = result;
-    return text.eof() && !text.fail();
-}
-}
-
 using namespace std;
 
 const UniValue NullUniValue;
@@ -104,7 +41,7 @@ static bool validNumStr(const string& s)
 {
     string tokenVal;
     unsigned int consumed;
-    enum jtokentype tt = getJsonToken(tokenVal, consumed, s.c_str());
+    enum jtokentype tt = getJsonToken(tokenVal, consumed, s.data(), s.data() + s.size());
     return (tt == JTOK_NUMBER);
 }
 
@@ -189,13 +126,22 @@ bool UniValue::push_backV(const std::vector<UniValue>& vec)
     return true;
 }
 
+void UniValue::__pushKV(const std::string& key, const UniValue& val_)
+{
+    keys.push_back(key);
+    values.push_back(val_);
+}
+
 bool UniValue::pushKV(const std::string& key, const UniValue& val_)
 {
     if (typ != VOBJ)
         return false;
 
-    keys.push_back(key);
-    values.push_back(val_);
+    size_t idx;
+    if (findKey(key, idx))
+        values[idx] = val_;
+    else
+        __pushKV(key, val_);
     return true;
 }
 
@@ -204,30 +150,43 @@ bool UniValue::pushKVs(const UniValue& obj)
     if (typ != VOBJ || obj.typ != VOBJ)
         return false;
 
-    for (unsigned int i = 0; i < obj.keys.size(); i++) {
-        keys.push_back(obj.keys[i]);
-        values.push_back(obj.values.at(i));
-    }
+    for (size_t i = 0; i < obj.keys.size(); i++)
+        __pushKV(obj.keys[i], obj.values.at(i));
 
     return true;
 }
 
-int UniValue::findKey(const std::string& key) const
+void UniValue::getObjMap(std::map<std::string,UniValue>& kv) const
+{
+    if (typ != VOBJ)
+        return;
+
+    kv.clear();
+    for (size_t i = 0; i < keys.size(); i++)
+        kv[keys[i]] = values[i];
+}
+
+bool UniValue::findKey(const std::string& key, size_t& retIdx) const
 {
-    for (unsigned int i = 0; i < keys.size(); i++) {
-        if (keys[i] == key)
-            return (int) i;
+    for (size_t i = 0; i < keys.size(); i++) {
+        if (keys[i] == key) {
+            retIdx = i;
+            return true;
+        }
     }
 
-    return -1;
+    return false;
 }
 
-bool UniValue::checkObject(const std::map<std::string,UniValue::VType>& t)
+bool UniValue::checkObject(const std::map<std::string,UniValue::VType>& t) const
 {
+    if (typ != VOBJ)
+        return false;
+
     for (std::map<std::string,UniValue::VType>::const_iterator it = t.begin();
          it != t.end(); ++it) {
-        int idx = findKey(it->first);
-        if (idx < 0)
+        size_t idx = 0;
+        if (!findKey(it->first, idx))
             return false;
 
         if (values.at(idx).getType() != it->second)
@@ -242,14 +201,14 @@ const UniValue& UniValue::operator[](const std::string& key) const
     if (typ != VOBJ)
         return NullUniValue;
 
-    int index = findKey(key);
-    if (index < 0)
+    size_t index = 0;
+    if (!findKey(key, index))
         return NullUniValue;
 
     return values.at(index);
 }
 
-const UniValue& UniValue::operator[](unsigned int index) const
+const UniValue& UniValue::operator[](size_t index) const
 {
     if (typ != VOBJ && typ != VARR)
         return NullUniValue;
@@ -283,75 +242,3 @@ const UniValue& find_value(const UniValue& obj, const std::string& name)
     return NullUniValue;
 }
 
-const std::vector<std::string>& UniValue::getKeys() const
-{
-    if (typ != VOBJ)
-        throw std::runtime_error("JSON value is not an object as expected");
-    return keys;
-}
-
-const std::vector<UniValue>& UniValue::getValues() const
-{
-    if (typ != VOBJ && typ != VARR)
-        throw std::runtime_error("JSON value is not an object or array as expected");
-    return values;
-}
-
-bool UniValue::get_bool() const
-{
-    if (typ != VBOOL)
-        throw std::runtime_error("JSON value is not a boolean as expected");
-    return getBool();
-}
-
-const std::string& UniValue::get_str() const
-{
-    if (typ != VSTR)
-        throw std::runtime_error("JSON value is not a string as expected");
-    return getValStr();
-}
-
-int UniValue::get_int() const
-{
-    if (typ != VNUM)
-        throw std::runtime_error("JSON value is not an integer as expected");
-    int32_t retval;
-    if (!ParseInt32(getValStr(), &retval))
-        throw std::runtime_error("JSON integer out of range");
-    return retval;
-}
-
-int64_t UniValue::get_int64() const
-{
-    if (typ != VNUM)
-        throw std::runtime_error("JSON value is not an integer as expected");
-    int64_t retval;
-    if (!ParseInt64(getValStr(), &retval))
-        throw std::runtime_error("JSON integer out of range");
-    return retval;
-}
-
-double UniValue::get_real() const
-{
-    if (typ != VNUM)
-        throw std::runtime_error("JSON value is not a number as expected");
-    double retval;
-    if (!ParseDouble(getValStr(), &retval))
-        throw std::runtime_error("JSON double out of range");
-    return retval;
-}
-
-const UniValue& UniValue::get_obj() const
-{
-    if (typ != VOBJ)
-        throw std::runtime_error("JSON value is not an object as expected");
-    return *this;
-}
-
-const UniValue& UniValue::get_array() const
-{
-    if (typ != VARR)
-        throw std::runtime_error("JSON value is not an array as expected");
-    return *this;
-}
-
diff --git a/src/univalue/lib/univalue_get.cpp b/src/univalue/lib/univalue_get.cpp
new file mode 100644
index 000000000..eabcf2dad
--- /dev/null
+++ b/src/univalue/lib/univalue_get.cpp
@@ -0,0 +1,147 @@
+// Copyright 2014 BitPay Inc.
+// Copyright 2015 Bitcoin Core Developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <stdint.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdexcept>
+#include <vector>
+#include <limits>
+#include <string>
+
+#include "univalue.h"
+
+namespace
+{
+static bool ParsePrechecks(const std::string& str)
+{
+    if (str.empty()) // No empty string allowed
+        return false;
+    if (str.size() >= 1 && (json_isspace(str[0]) || json_isspace(str[str.size()-1]))) // No padding allowed
+        return false;
+    if (str.size() != strlen(str.c_str())) // No embedded NUL characters allowed
+        return false;
+    return true;
+}
+
+bool ParseInt32(const std::string& str, int32_t *out)
+{
+    if (!ParsePrechecks(str))
+        return false;
+    char *endp = NULL;
+    errno = 0; // strtol will not set errno if valid
+    long int n = strtol(str.c_str(), &endp, 10);
+    if(out) *out = (int32_t)n;
+    // Note that strtol returns a *long int*, so even if strtol doesn't report a over/underflow
+    // we still have to check that the returned value is within the range of an *int32_t*. On 64-bit
+    // platforms the size of these types may be different.
+    return endp && *endp == 0 && !errno &&
+        n >= std::numeric_limits<int32_t>::min() &&
+        n <= std::numeric_limits<int32_t>::max();
+}
+
+bool ParseInt64(const std::string& str, int64_t *out)
+{
+    if (!ParsePrechecks(str))
+        return false;
+    char *endp = NULL;
+    errno = 0; // strtoll will not set errno if valid
+    long long int n = strtoll(str.c_str(), &endp, 10);
+    if(out) *out = (int64_t)n;
+    // Note that strtoll returns a *long long int*, so even if strtol doesn't report a over/underflow
+    // we still have to check that the returned value is within the range of an *int64_t*.
+    return endp && *endp == 0 && !errno &&
+        n >= std::numeric_limits<int64_t>::min() &&
+        n <= std::numeric_limits<int64_t>::max();
+}
+
+bool ParseDouble(const std::string& str, double *out)
+{
+    if (!ParsePrechecks(str))
+        return false;
+    if (str.size() >= 2 && str[0] == '0' && str[1] == 'x') // No hexadecimal floats allowed
+        return false;
+    std::istringstream text(str);
+    text.imbue(std::locale::classic());
+    double result;
+    text >> result;
+    if(out) *out = result;
+    return text.eof() && !text.fail();
+}
+}
+
+const std::vector<std::string>& UniValue::getKeys() const
+{
+    if (typ != VOBJ)
+        throw std::runtime_error("JSON value is not an object as expected");
+    return keys;
+}
+
+const std::vector<UniValue>& UniValue::getValues() const
+{
+    if (typ != VOBJ && typ != VARR)
+        throw std::runtime_error("JSON value is not an object or array as expected");
+    return values;
+}
+
+bool UniValue::get_bool() const
+{
+    if (typ != VBOOL)
+        throw std::runtime_error("JSON value is not a boolean as expected");
+    return getBool();
+}
+
+const std::string& UniValue::get_str() const
+{
+    if (typ != VSTR)
+        throw std::runtime_error("JSON value is not a string as expected");
+    return getValStr();
+}
+
+int UniValue::get_int() const
+{
+    if (typ != VNUM)
+        throw std::runtime_error("JSON value is not an integer as expected");
+    int32_t retval;
+    if (!ParseInt32(getValStr(), &retval))
+        throw std::runtime_error("JSON integer out of range");
+    return retval;
+}
+
+int64_t UniValue::get_int64() const
+{
+    if (typ != VNUM)
+        throw std::runtime_error("JSON value is not an integer as expected");
+    int64_t retval;
+    if (!ParseInt64(getValStr(), &retval))
+        throw std::runtime_error("JSON integer out of range");
+    return retval;
+}
+
+double UniValue::get_real() const
+{
+    if (typ != VNUM)
+        throw std::runtime_error("JSON value is not a number as expected");
+    double retval;
+    if (!ParseDouble(getValStr(), &retval))
+        throw std::runtime_error("JSON double out of range");
+    return retval;
+}
+
+const UniValue& UniValue::get_obj() const
+{
+    if (typ != VOBJ)
+        throw std::runtime_error("JSON value is not an object as expected");
+    return *this;
+}
+
+const UniValue& UniValue::get_array() const
+{
+    if (typ != VARR)
+        throw std::runtime_error("JSON value is not an array as expected");
+    return *this;
+}
+
diff --git a/src/univalue/lib/univalue_read.cpp b/src/univalue/lib/univalue_read.cpp
index 95bac6958..ae75cb462 100644
--- a/src/univalue/lib/univalue_read.cpp
+++ b/src/univalue/lib/univalue_read.cpp
@@ -43,21 +43,21 @@ static const char *hatoui(const char *first, const char *last,
 }
 
 enum jtokentype getJsonToken(string& tokenVal, unsigned int& consumed,
-                            const char *raw)
+                            const char *raw, const char *end)
 {
     tokenVal.clear();
     consumed = 0;
 
     const char *rawStart = raw;
 
-    while ((*raw) && (json_isspace(*raw)))             // skip whitespace
+    while (raw < end && (json_isspace(*raw)))          // skip whitespace
         raw++;
 
-    switch (*raw) {
-
-    case 0:
+    if (raw >= end)
         return JTOK_NONE;
 
+    switch (*raw) {
+
     case '{':
         raw++;
         consumed = (raw - rawStart);
@@ -127,40 +127,40 @@ enum jtokentype getJsonToken(string& tokenVal, unsigned int& consumed,
         numStr += *raw;                       // copy first char
         raw++;
 
-        if ((*first == '-') && (!json_isdigit(*raw)))
+        if ((*first == '-') && (raw < end) && (!json_isdigit(*raw)))
             return JTOK_ERR;
 
-        while ((*raw) && json_isdigit(*raw)) {     // copy digits
+        while (raw < end && json_isdigit(*raw)) {  // copy digits
             numStr += *raw;
             raw++;
         }
 
         // part 2: frac
-        if (*raw == '.') {
+        if (raw < end && *raw == '.') {
             numStr += *raw;                   // copy .
             raw++;
 
-            if (!json_isdigit(*raw))
+            if (raw >= end || !json_isdigit(*raw))
                 return JTOK_ERR;
-            while ((*raw) && json_isdigit(*raw)) { // copy digits
+            while (raw < end && json_isdigit(*raw)) { // copy digits
                 numStr += *raw;
                 raw++;
             }
         }
 
         // part 3: exp
-        if (*raw == 'e' || *raw == 'E') {
+        if (raw < end && (*raw == 'e' || *raw == 'E')) {
             numStr += *raw;                   // copy E
             raw++;
 
-            if (*raw == '-' || *raw == '+') { // copy +/-
+            if (raw < end && (*raw == '-' || *raw == '+')) { // copy +/-
                 numStr += *raw;
                 raw++;
             }
 
-            if (!json_isdigit(*raw))
+            if (raw >= end || !json_isdigit(*raw))
                 return JTOK_ERR;
-            while ((*raw) && json_isdigit(*raw)) { // copy digits
+            while (raw < end && json_isdigit(*raw)) { // copy digits
                 numStr += *raw;
                 raw++;
             }
@@ -177,13 +177,16 @@ enum jtokentype getJsonToken(string& tokenVal, unsigned int& consumed,
         string valStr;
         JSONUTF8StringFilter writer(valStr);
 
-        while (*raw) {
-            if ((unsigned char)*raw < 0x20)
+        while (true) {
+            if (raw >= end || (unsigned char)*raw < 0x20)
                 return JTOK_ERR;
 
             else if (*raw == '\\') {
                 raw++;                        // skip backslash
 
+                if (raw >= end)
+                    return JTOK_ERR;
+
                 switch (*raw) {
                 case '"':  writer.push_back('\"'); break;
                 case '\\': writer.push_back('\\'); break;
@@ -196,7 +199,8 @@ enum jtokentype getJsonToken(string& tokenVal, unsigned int& consumed,
 
                 case 'u': {
                     unsigned int codepoint;
-                    if (hatoui(raw + 1, raw + 1 + 4, codepoint) !=
+                    if (raw + 1 + 4 >= end ||
+                        hatoui(raw + 1, raw + 1 + 4, codepoint) !=
                                raw + 1 + 4)
                         return JTOK_ERR;
                     writer.push_back_u(codepoint);
@@ -246,7 +250,7 @@ enum expect_bits {
 #define setExpect(bit) (expectMask |= EXP_##bit)
 #define clearExpect(bit) (expectMask &= ~EXP_##bit)
 
-bool UniValue::read(const char *raw)
+bool UniValue::read(const char *raw, size_t size)
 {
     clear();
 
@@ -257,10 +261,11 @@ bool UniValue::read(const char *raw)
     unsigned int consumed;
     enum jtokentype tok = JTOK_NONE;
     enum jtokentype last_tok = JTOK_NONE;
+    const char* end = raw + size;
     do {
         last_tok = tok;
 
-        tok = getJsonToken(tokenVal, consumed, raw);
+        tok = getJsonToken(tokenVal, consumed, raw, end);
         if (tok == JTOK_NONE || tok == JTOK_ERR)
             return false;
         raw += consumed;
@@ -371,9 +376,6 @@ bool UniValue::read(const char *raw)
         case JTOK_KW_NULL:
         case JTOK_KW_TRUE:
         case JTOK_KW_FALSE: {
-            if (!stack.size())
-                return false;
-
             UniValue tmpVal;
             switch (tok) {
             case JTOK_KW_NULL:
@@ -388,6 +390,11 @@ bool UniValue::read(const char *raw)
             default: /* impossible */ break;
             }
 
+            if (!stack.size()) {
+                *this = tmpVal;
+                break;
+            }
+
             UniValue *top = stack.back();
             top->values.push_back(tmpVal);
 
@@ -396,10 +403,12 @@ bool UniValue::read(const char *raw)
             }
 
         case JTOK_NUMBER: {
-            if (!stack.size())
-                return false;
-
             UniValue tmpVal(VNUM, tokenVal);
+            if (!stack.size()) {
+                *this = tmpVal;
+                break;
+            }
+
             UniValue *top = stack.back();
             top->values.push_back(tmpVal);
 
@@ -408,17 +417,18 @@ bool UniValue::read(const char *raw)
             }
 
         case JTOK_STRING: {
-            if (!stack.size())
-                return false;
-
-            UniValue *top = stack.back();
-
             if (expect(OBJ_NAME)) {
+                UniValue *top = stack.back();
                 top->keys.push_back(tokenVal);
                 clearExpect(OBJ_NAME);
                 setExpect(COLON);
             } else {
                 UniValue tmpVal(VSTR, tokenVal);
+                if (!stack.size()) {
+                    *this = tmpVal;
+                    break;
+                }
+                UniValue *top = stack.back();
                 top->values.push_back(tmpVal);
             }
 
@@ -432,7 +442,7 @@ bool UniValue::read(const char *raw)
     } while (!stack.empty ());
 
     /* Check that nothing follows the initial construct (parsed above).  */
-    tok = getJsonToken(tokenVal, consumed, raw);
+    tok = getJsonToken(tokenVal, consumed, raw, end);
     if (tok != JTOK_NONE)
         return false;
 
diff --git a/src/univalue/lib/univalue_utffilter.h b/src/univalue/lib/univalue_utffilter.h
index 0e330dce9..20d404300 100644
--- a/src/univalue/lib/univalue_utffilter.h
+++ b/src/univalue/lib/univalue_utffilter.h
@@ -13,7 +13,7 @@
 class JSONUTF8StringFilter
 {
 public:
-    JSONUTF8StringFilter(std::string &s):
+    explicit JSONUTF8StringFilter(std::string &s):
         str(s), is_valid(true), codepoint(0), state(0), surpair(0)
     {
     }
@@ -46,19 +46,19 @@ class JSONUTF8StringFilter
         }
     }
     // Write codepoint directly, possibly collating surrogate pairs
-    void push_back_u(unsigned int codepoint)
+    void push_back_u(unsigned int codepoint_)
     {
         if (state) // Only accept full codepoints in open state
             is_valid = false;
-        if (codepoint >= 0xD800 && codepoint < 0xDC00) { // First half of surrogate pair
+        if (codepoint_ >= 0xD800 && codepoint_ < 0xDC00) { // First half of surrogate pair
             if (surpair) // Two subsequent surrogate pair openers - fail
                 is_valid = false;
             else
-                surpair = codepoint;
-        } else if (codepoint >= 0xDC00 && codepoint < 0xE000) { // Second half of surrogate pair
+                surpair = codepoint_;
+        } else if (codepoint_ >= 0xDC00 && codepoint_ < 0xE000) { // Second half of surrogate pair
             if (surpair) { // Open surrogate pair, expect second half
                 // Compute code point from UTF-16 surrogate pair
-                append_codepoint(0x10000 | ((surpair - 0xD800)<<10) | (codepoint - 0xDC00));
+                append_codepoint(0x10000 | ((surpair - 0xD800)<<10) | (codepoint_ - 0xDC00));
                 surpair = 0;
             } else // Second half doesn't follow a first half - fail
                 is_valid = false;
@@ -66,7 +66,7 @@ class JSONUTF8StringFilter
             if (surpair) // First half of surrogate pair not followed by second - fail
                 is_valid = false;
             else
-                append_codepoint(codepoint);
+                append_codepoint(codepoint_);
         }
     }
     // Check that we're in a state where the string can be ended
@@ -96,22 +96,22 @@ class JSONUTF8StringFilter
     //  Two subsequent \u.... may have to be replaced with one actual codepoint.
     unsigned int surpair; // First half of open UTF-16 surrogate pair, or 0
 
-    void append_codepoint(unsigned int codepoint)
+    void append_codepoint(unsigned int codepoint_)
     {
-        if (codepoint <= 0x7f)
-            str.push_back((char)codepoint);
-        else if (codepoint <= 0x7FF) {
-            str.push_back((char)(0xC0 | (codepoint >> 6)));
-            str.push_back((char)(0x80 | (codepoint & 0x3F)));
-        } else if (codepoint <= 0xFFFF) {
-            str.push_back((char)(0xE0 | (codepoint >> 12)));
-            str.push_back((char)(0x80 | ((codepoint >> 6) & 0x3F)));
-            str.push_back((char)(0x80 | (codepoint & 0x3F)));
-        } else if (codepoint <= 0x1FFFFF) {
-            str.push_back((char)(0xF0 | (codepoint >> 18)));
-            str.push_back((char)(0x80 | ((codepoint >> 12) & 0x3F)));
-            str.push_back((char)(0x80 | ((codepoint >> 6) & 0x3F)));
-            str.push_back((char)(0x80 | (codepoint & 0x3F)));
+        if (codepoint_ <= 0x7f)
+            str.push_back((char)codepoint_);
+        else if (codepoint_ <= 0x7FF) {
+            str.push_back((char)(0xC0 | (codepoint_ >> 6)));
+            str.push_back((char)(0x80 | (codepoint_ & 0x3F)));
+        } else if (codepoint_ <= 0xFFFF) {
+            str.push_back((char)(0xE0 | (codepoint_ >> 12)));
+            str.push_back((char)(0x80 | ((codepoint_ >> 6) & 0x3F)));
+            str.push_back((char)(0x80 | (codepoint_ & 0x3F)));
+        } else if (codepoint_ <= 0x1FFFFF) {
+            str.push_back((char)(0xF0 | (codepoint_ >> 18)));
+            str.push_back((char)(0x80 | ((codepoint_ >> 12) & 0x3F)));
+            str.push_back((char)(0x80 | ((codepoint_ >> 6) & 0x3F)));
+            str.push_back((char)(0x80 | (codepoint_ & 0x3F)));
         }
     }
 };
diff --git a/src/univalue/lib/univalue_write.cpp b/src/univalue/lib/univalue_write.cpp
index cfbdad328..cf2783599 100644
--- a/src/univalue/lib/univalue_write.cpp
+++ b/src/univalue/lib/univalue_write.cpp
@@ -79,8 +79,6 @@ void UniValue::writeArray(unsigned int prettyIndent, unsigned int indentLevel, s
         s += values[i].write(prettyIndent, indentLevel + 1);
         if (i != (values.size() - 1)) {
             s += ",";
-            if (prettyIndent)
-                s += " ";
         }
         if (prettyIndent)
             s += "\n";
diff --git a/src/univalue/test/.gitignore b/src/univalue/test/.gitignore
index 3d9347fe7..7b27cf0da 100644
--- a/src/univalue/test/.gitignore
+++ b/src/univalue/test/.gitignore
@@ -1,4 +1,8 @@
+
+object
 unitester
+test_json
+no_nul
 
 *.trs
 *.log
diff --git a/src/univalue/test/fail1.json b/src/univalue/test/fail1.json
index 6216b865f..8feb01a6d 100644
--- a/src/univalue/test/fail1.json
+++ b/src/univalue/test/fail1.json
@@ -1 +1 @@
-"A JSON payload should be an object or array, not a string."
\ No newline at end of file
+"This is a string that never ends, yes it goes on and on, my friends.
diff --git a/src/univalue/test/fail42.json b/src/univalue/test/fail42.json
new file mode 100644
index 000000000..9c7565adb
Binary files /dev/null and b/src/univalue/test/fail42.json differ
diff --git a/src/univalue/test/fail44.json b/src/univalue/test/fail44.json
new file mode 100644
index 000000000..80edceddf
--- /dev/null
+++ b/src/univalue/test/fail44.json
@@ -0,0 +1 @@
+"This file ends without a newline or close-quote.
\ No newline at end of file
diff --git a/src/univalue/test/no_nul.cpp b/src/univalue/test/no_nul.cpp
new file mode 100644
index 000000000..83d292200
--- /dev/null
+++ b/src/univalue/test/no_nul.cpp
@@ -0,0 +1,8 @@
+#include "univalue.h"
+
+int main (int argc, char *argv[])
+{
+    char buf[] = "___[1,2,3]___";
+    UniValue val;
+    return val.read(buf + 3, 7) ? 0 : 1;
+}
diff --git a/src/univalue/test/object.cpp b/src/univalue/test/object.cpp
new file mode 100644
index 000000000..02446292a
--- /dev/null
+++ b/src/univalue/test/object.cpp
@@ -0,0 +1,395 @@
+// Copyright (c) 2014 BitPay Inc.
+// Copyright (c) 2014-2016 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <stdint.h>
+#include <vector>
+#include <string>
+#include <map>
+#include <cassert>
+#include <stdexcept>
+#include <univalue.h>
+
+#define BOOST_FIXTURE_TEST_SUITE(a, b)
+#define BOOST_AUTO_TEST_CASE(funcName) void funcName()
+#define BOOST_AUTO_TEST_SUITE_END()
+#define BOOST_CHECK(expr) assert(expr)
+#define BOOST_CHECK_EQUAL(v1, v2) assert((v1) == (v2))
+#define BOOST_CHECK_THROW(stmt, excMatch) { \
+        try { \
+            (stmt); \
+        } catch (excMatch & e) { \
+	} catch (...) { \
+	    assert(0); \
+	} \
+    }
+#define BOOST_CHECK_NO_THROW(stmt) { \
+        try { \
+            (stmt); \
+	} catch (...) { \
+	    assert(0); \
+	} \
+    }
+
+BOOST_FIXTURE_TEST_SUITE(univalue_tests, BasicTestingSetup)
+
+BOOST_AUTO_TEST_CASE(univalue_constructor)
+{
+    UniValue v1;
+    BOOST_CHECK(v1.isNull());
+
+    UniValue v2(UniValue::VSTR);
+    BOOST_CHECK(v2.isStr());
+
+    UniValue v3(UniValue::VSTR, "foo");
+    BOOST_CHECK(v3.isStr());
+    BOOST_CHECK_EQUAL(v3.getValStr(), "foo");
+
+    UniValue numTest;
+    BOOST_CHECK(numTest.setNumStr("82"));
+    BOOST_CHECK(numTest.isNum());
+    BOOST_CHECK_EQUAL(numTest.getValStr(), "82");
+
+    uint64_t vu64 = 82;
+    UniValue v4(vu64);
+    BOOST_CHECK(v4.isNum());
+    BOOST_CHECK_EQUAL(v4.getValStr(), "82");
+
+    int64_t vi64 = -82;
+    UniValue v5(vi64);
+    BOOST_CHECK(v5.isNum());
+    BOOST_CHECK_EQUAL(v5.getValStr(), "-82");
+
+    int vi = -688;
+    UniValue v6(vi);
+    BOOST_CHECK(v6.isNum());
+    BOOST_CHECK_EQUAL(v6.getValStr(), "-688");
+
+    double vd = -7.21;
+    UniValue v7(vd);
+    BOOST_CHECK(v7.isNum());
+    BOOST_CHECK_EQUAL(v7.getValStr(), "-7.21");
+
+    std::string vs("yawn");
+    UniValue v8(vs);
+    BOOST_CHECK(v8.isStr());
+    BOOST_CHECK_EQUAL(v8.getValStr(), "yawn");
+
+    const char *vcs = "zappa";
+    UniValue v9(vcs);
+    BOOST_CHECK(v9.isStr());
+    BOOST_CHECK_EQUAL(v9.getValStr(), "zappa");
+}
+
+BOOST_AUTO_TEST_CASE(univalue_typecheck)
+{
+    UniValue v1;
+    BOOST_CHECK(v1.setNumStr("1"));
+    BOOST_CHECK(v1.isNum());
+    BOOST_CHECK_THROW(v1.get_bool(), std::runtime_error);
+
+    UniValue v2;
+    BOOST_CHECK(v2.setBool(true));
+    BOOST_CHECK_EQUAL(v2.get_bool(), true);
+    BOOST_CHECK_THROW(v2.get_int(), std::runtime_error);
+
+    UniValue v3;
+    BOOST_CHECK(v3.setNumStr("32482348723847471234"));
+    BOOST_CHECK_THROW(v3.get_int64(), std::runtime_error);
+    BOOST_CHECK(v3.setNumStr("1000"));
+    BOOST_CHECK_EQUAL(v3.get_int64(), 1000);
+
+    UniValue v4;
+    BOOST_CHECK(v4.setNumStr("2147483648"));
+    BOOST_CHECK_EQUAL(v4.get_int64(), 2147483648);
+    BOOST_CHECK_THROW(v4.get_int(), std::runtime_error);
+    BOOST_CHECK(v4.setNumStr("1000"));
+    BOOST_CHECK_EQUAL(v4.get_int(), 1000);
+    BOOST_CHECK_THROW(v4.get_str(), std::runtime_error);
+    BOOST_CHECK_EQUAL(v4.get_real(), 1000);
+    BOOST_CHECK_THROW(v4.get_array(), std::runtime_error);
+    BOOST_CHECK_THROW(v4.getKeys(), std::runtime_error);
+    BOOST_CHECK_THROW(v4.getValues(), std::runtime_error);
+    BOOST_CHECK_THROW(v4.get_obj(), std::runtime_error);
+
+    UniValue v5;
+    BOOST_CHECK(v5.read("[true, 10]"));
+    BOOST_CHECK_NO_THROW(v5.get_array());
+    std::vector<UniValue> vals = v5.getValues();
+    BOOST_CHECK_THROW(vals[0].get_int(), std::runtime_error);
+    BOOST_CHECK_EQUAL(vals[0].get_bool(), true);
+
+    BOOST_CHECK_EQUAL(vals[1].get_int(), 10);
+    BOOST_CHECK_THROW(vals[1].get_bool(), std::runtime_error);
+}
+
+BOOST_AUTO_TEST_CASE(univalue_set)
+{
+    UniValue v(UniValue::VSTR, "foo");
+    v.clear();
+    BOOST_CHECK(v.isNull());
+    BOOST_CHECK_EQUAL(v.getValStr(), "");
+
+    BOOST_CHECK(v.setObject());
+    BOOST_CHECK(v.isObject());
+    BOOST_CHECK_EQUAL(v.size(), 0);
+    BOOST_CHECK_EQUAL(v.getType(), UniValue::VOBJ);
+    BOOST_CHECK(v.empty());
+
+    BOOST_CHECK(v.setArray());
+    BOOST_CHECK(v.isArray());
+    BOOST_CHECK_EQUAL(v.size(), 0);
+
+    BOOST_CHECK(v.setStr("zum"));
+    BOOST_CHECK(v.isStr());
+    BOOST_CHECK_EQUAL(v.getValStr(), "zum");
+
+    BOOST_CHECK(v.setFloat(-1.01));
+    BOOST_CHECK(v.isNum());
+    BOOST_CHECK_EQUAL(v.getValStr(), "-1.01");
+
+    BOOST_CHECK(v.setInt((int)1023));
+    BOOST_CHECK(v.isNum());
+    BOOST_CHECK_EQUAL(v.getValStr(), "1023");
+
+    BOOST_CHECK(v.setInt((int64_t)-1023LL));
+    BOOST_CHECK(v.isNum());
+    BOOST_CHECK_EQUAL(v.getValStr(), "-1023");
+
+    BOOST_CHECK(v.setInt((uint64_t)1023ULL));
+    BOOST_CHECK(v.isNum());
+    BOOST_CHECK_EQUAL(v.getValStr(), "1023");
+
+    BOOST_CHECK(v.setNumStr("-688"));
+    BOOST_CHECK(v.isNum());
+    BOOST_CHECK_EQUAL(v.getValStr(), "-688");
+
+    BOOST_CHECK(v.setBool(false));
+    BOOST_CHECK_EQUAL(v.isBool(), true);
+    BOOST_CHECK_EQUAL(v.isTrue(), false);
+    BOOST_CHECK_EQUAL(v.isFalse(), true);
+    BOOST_CHECK_EQUAL(v.getBool(), false);
+
+    BOOST_CHECK(v.setBool(true));
+    BOOST_CHECK_EQUAL(v.isBool(), true);
+    BOOST_CHECK_EQUAL(v.isTrue(), true);
+    BOOST_CHECK_EQUAL(v.isFalse(), false);
+    BOOST_CHECK_EQUAL(v.getBool(), true);
+
+    BOOST_CHECK(!v.setNumStr("zombocom"));
+
+    BOOST_CHECK(v.setNull());
+    BOOST_CHECK(v.isNull());
+}
+
+BOOST_AUTO_TEST_CASE(univalue_array)
+{
+    UniValue arr(UniValue::VARR);
+
+    UniValue v((int64_t)1023LL);
+    BOOST_CHECK(arr.push_back(v));
+
+    std::string vStr("zippy");
+    BOOST_CHECK(arr.push_back(vStr));
+
+    const char *s = "pippy";
+    BOOST_CHECK(arr.push_back(s));
+
+    std::vector<UniValue> vec;
+    v.setStr("boing");
+    vec.push_back(v);
+
+    v.setStr("going");
+    vec.push_back(v);
+
+    BOOST_CHECK(arr.push_backV(vec));
+
+    BOOST_CHECK(arr.push_back((uint64_t) 400ULL));
+    BOOST_CHECK(arr.push_back((int64_t) -400LL));
+    BOOST_CHECK(arr.push_back((int) -401));
+    BOOST_CHECK(arr.push_back(-40.1));
+
+    BOOST_CHECK_EQUAL(arr.empty(), false);
+    BOOST_CHECK_EQUAL(arr.size(), 9);
+
+    BOOST_CHECK_EQUAL(arr[0].getValStr(), "1023");
+    BOOST_CHECK_EQUAL(arr[1].getValStr(), "zippy");
+    BOOST_CHECK_EQUAL(arr[2].getValStr(), "pippy");
+    BOOST_CHECK_EQUAL(arr[3].getValStr(), "boing");
+    BOOST_CHECK_EQUAL(arr[4].getValStr(), "going");
+    BOOST_CHECK_EQUAL(arr[5].getValStr(), "400");
+    BOOST_CHECK_EQUAL(arr[6].getValStr(), "-400");
+    BOOST_CHECK_EQUAL(arr[7].getValStr(), "-401");
+    BOOST_CHECK_EQUAL(arr[8].getValStr(), "-40.1");
+
+    BOOST_CHECK_EQUAL(arr[999].getValStr(), "");
+
+    arr.clear();
+    BOOST_CHECK(arr.empty());
+    BOOST_CHECK_EQUAL(arr.size(), 0);
+}
+
+BOOST_AUTO_TEST_CASE(univalue_object)
+{
+    UniValue obj(UniValue::VOBJ);
+    std::string strKey, strVal;
+    UniValue v;
+
+    strKey = "age";
+    v.setInt(100);
+    BOOST_CHECK(obj.pushKV(strKey, v));
+
+    strKey = "first";
+    strVal = "John";
+    BOOST_CHECK(obj.pushKV(strKey, strVal));
+
+    strKey = "last";
+    const char *cVal = "Smith";
+    BOOST_CHECK(obj.pushKV(strKey, cVal));
+
+    strKey = "distance";
+    BOOST_CHECK(obj.pushKV(strKey, (int64_t) 25));
+
+    strKey = "time";
+    BOOST_CHECK(obj.pushKV(strKey, (uint64_t) 3600));
+
+    strKey = "calories";
+    BOOST_CHECK(obj.pushKV(strKey, (int) 12));
+
+    strKey = "temperature";
+    BOOST_CHECK(obj.pushKV(strKey, (double) 90.012));
+
+    UniValue obj2(UniValue::VOBJ);
+    BOOST_CHECK(obj2.pushKV("cat1", 9000));
+    BOOST_CHECK(obj2.pushKV("cat2", 12345));
+
+    BOOST_CHECK(obj.pushKVs(obj2));
+
+    BOOST_CHECK_EQUAL(obj.empty(), false);
+    BOOST_CHECK_EQUAL(obj.size(), 9);
+
+    BOOST_CHECK_EQUAL(obj["age"].getValStr(), "100");
+    BOOST_CHECK_EQUAL(obj["first"].getValStr(), "John");
+    BOOST_CHECK_EQUAL(obj["last"].getValStr(), "Smith");
+    BOOST_CHECK_EQUAL(obj["distance"].getValStr(), "25");
+    BOOST_CHECK_EQUAL(obj["time"].getValStr(), "3600");
+    BOOST_CHECK_EQUAL(obj["calories"].getValStr(), "12");
+    BOOST_CHECK_EQUAL(obj["temperature"].getValStr(), "90.012");
+    BOOST_CHECK_EQUAL(obj["cat1"].getValStr(), "9000");
+    BOOST_CHECK_EQUAL(obj["cat2"].getValStr(), "12345");
+
+    BOOST_CHECK_EQUAL(obj["nyuknyuknyuk"].getValStr(), "");
+
+    BOOST_CHECK(obj.exists("age"));
+    BOOST_CHECK(obj.exists("first"));
+    BOOST_CHECK(obj.exists("last"));
+    BOOST_CHECK(obj.exists("distance"));
+    BOOST_CHECK(obj.exists("time"));
+    BOOST_CHECK(obj.exists("calories"));
+    BOOST_CHECK(obj.exists("temperature"));
+    BOOST_CHECK(obj.exists("cat1"));
+    BOOST_CHECK(obj.exists("cat2"));
+
+    BOOST_CHECK(!obj.exists("nyuknyuknyuk"));
+
+    std::map<std::string, UniValue::VType> objTypes;
+    objTypes["age"] = UniValue::VNUM;
+    objTypes["first"] = UniValue::VSTR;
+    objTypes["last"] = UniValue::VSTR;
+    objTypes["distance"] = UniValue::VNUM;
+    objTypes["time"] = UniValue::VNUM;
+    objTypes["calories"] = UniValue::VNUM;
+    objTypes["temperature"] = UniValue::VNUM;
+    objTypes["cat1"] = UniValue::VNUM;
+    objTypes["cat2"] = UniValue::VNUM;
+    BOOST_CHECK(obj.checkObject(objTypes));
+
+    objTypes["cat2"] = UniValue::VSTR;
+    BOOST_CHECK(!obj.checkObject(objTypes));
+
+    obj.clear();
+    BOOST_CHECK(obj.empty());
+    BOOST_CHECK_EQUAL(obj.size(), 0);
+    BOOST_CHECK_EQUAL(obj.getType(), UniValue::VNULL);
+
+    BOOST_CHECK_EQUAL(obj.setObject(), true);
+    UniValue uv;
+    uv.setInt(42);
+    obj.__pushKV("age", uv);
+    BOOST_CHECK_EQUAL(obj.size(), 1);
+    BOOST_CHECK_EQUAL(obj["age"].getValStr(), "42");
+
+    uv.setInt(43);
+    obj.pushKV("age", uv);
+    BOOST_CHECK_EQUAL(obj.size(), 1);
+    BOOST_CHECK_EQUAL(obj["age"].getValStr(), "43");
+
+    obj.pushKV("name", "foo bar");
+
+    std::map<std::string,UniValue> kv;
+    obj.getObjMap(kv);
+    BOOST_CHECK_EQUAL(kv["age"].getValStr(), "43");
+    BOOST_CHECK_EQUAL(kv["name"].getValStr(), "foo bar");
+
+}
+
+static const char *json1 =
+"[1.10000000,{\"key1\":\"str\\u0000\",\"key2\":800,\"key3\":{\"name\":\"martian http://test.com\"}}]";
+
+BOOST_AUTO_TEST_CASE(univalue_readwrite)
+{
+    UniValue v;
+    BOOST_CHECK(v.read(json1));
+
+    std::string strJson1(json1);
+    BOOST_CHECK(v.read(strJson1));
+
+    BOOST_CHECK(v.isArray());
+    BOOST_CHECK_EQUAL(v.size(), 2);
+
+    BOOST_CHECK_EQUAL(v[0].getValStr(), "1.10000000");
+
+    UniValue obj = v[1];
+    BOOST_CHECK(obj.isObject());
+    BOOST_CHECK_EQUAL(obj.size(), 3);
+
+    BOOST_CHECK(obj["key1"].isStr());
+    std::string correctValue("str");
+    correctValue.push_back('\0');
+    BOOST_CHECK_EQUAL(obj["key1"].getValStr(), correctValue);
+    BOOST_CHECK(obj["key2"].isNum());
+    BOOST_CHECK_EQUAL(obj["key2"].getValStr(), "800");
+    BOOST_CHECK(obj["key3"].isObject());
+
+    BOOST_CHECK_EQUAL(strJson1, v.write());
+
+    /* Check for (correctly reporting) a parsing error if the initial
+       JSON construct is followed by more stuff.  Note that whitespace
+       is, of course, exempt.  */
+
+    BOOST_CHECK(v.read("  {}\n  "));
+    BOOST_CHECK(v.isObject());
+    BOOST_CHECK(v.read("  []\n  "));
+    BOOST_CHECK(v.isArray());
+
+    BOOST_CHECK(!v.read("@{}"));
+    BOOST_CHECK(!v.read("{} garbage"));
+    BOOST_CHECK(!v.read("[]{}"));
+    BOOST_CHECK(!v.read("{}[]"));
+    BOOST_CHECK(!v.read("{} 42"));
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+
+int main (int argc, char *argv[])
+{
+    univalue_constructor();
+    univalue_typecheck();
+    univalue_set();
+    univalue_array();
+    univalue_object();
+    univalue_readwrite();
+    return 0;
+}
+
diff --git a/src/univalue/test/round3.json b/src/univalue/test/round3.json
new file mode 100644
index 000000000..7182dc2f9
--- /dev/null
+++ b/src/univalue/test/round3.json
@@ -0,0 +1 @@
+"abcdefghijklmnopqrstuvwxyz"
diff --git a/src/univalue/test/round4.json b/src/univalue/test/round4.json
new file mode 100644
index 000000000..7f8f011eb
--- /dev/null
+++ b/src/univalue/test/round4.json
@@ -0,0 +1 @@
+7
diff --git a/src/univalue/test/round5.json b/src/univalue/test/round5.json
new file mode 100644
index 000000000..27ba77dda
--- /dev/null
+++ b/src/univalue/test/round5.json
@@ -0,0 +1 @@
+true
diff --git a/src/univalue/test/round6.json b/src/univalue/test/round6.json
new file mode 100644
index 000000000..c508d5366
--- /dev/null
+++ b/src/univalue/test/round6.json
@@ -0,0 +1 @@
+false
diff --git a/src/univalue/test/round7.json b/src/univalue/test/round7.json
new file mode 100644
index 000000000..19765bd50
--- /dev/null
+++ b/src/univalue/test/round7.json
@@ -0,0 +1 @@
+null
diff --git a/src/univalue/test/test_json.cpp b/src/univalue/test/test_json.cpp
new file mode 100644
index 000000000..2943bae2b
--- /dev/null
+++ b/src/univalue/test/test_json.cpp
@@ -0,0 +1,24 @@
+// Test program that can be called by the JSON test suite at
+// https://github.com/nst/JSONTestSuite.
+//
+// It reads JSON input from stdin and exits with code 0 if it can be parsed
+// successfully. It also pretty prints the parsed JSON value to stdout.
+
+#include <iostream>
+#include <string>
+#include "univalue.h"
+
+using namespace std;
+
+int main (int argc, char *argv[])
+{
+    UniValue val;
+    if (val.read(string(istreambuf_iterator<char>(cin),
+                        istreambuf_iterator<char>()))) {
+        cout << val.write(1 /* prettyIndent */, 4 /* indentLevel */) << endl;
+        return 0;
+    } else {
+        cerr << "JSON Parse Error." << endl;
+        return 1;
+    }
+}
diff --git a/src/univalue/test/unitester.cpp b/src/univalue/test/unitester.cpp
index 05f3842cd..2c37794a4 100644
--- a/src/univalue/test/unitester.cpp
+++ b/src/univalue/test/unitester.cpp
@@ -113,6 +113,8 @@ static const char *filenames[] = {
         "fail39.json",               // invalid unicode: only second half of surrogate pair
         "fail40.json",               // invalid unicode: broken UTF-8
         "fail41.json",               // invalid unicode: unfinished UTF-8
+        "fail42.json",               // valid json with garbage following a nul byte
+        "fail44.json",               // unterminated string
         "fail3.json",
         "fail4.json",                // extra comma
         "fail5.json",
@@ -125,6 +127,11 @@ static const char *filenames[] = {
         "pass3.json",
         "round1.json",              // round-trip test
         "round2.json",              // unicode
+        "round3.json",              // bare string
+        "round4.json",              // bare number
+        "round5.json",              // bare true
+        "round6.json",              // bare false
+        "round7.json",              // bare null
 };
 
 // Test \u handling
diff --git a/src/util.cpp b/src/util.cpp
index 1267fa46b..41a06c4b2 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -144,7 +144,7 @@ class CInit
         // Securely erase the memory used by the PRNG
         RAND_cleanup();
         // Shutdown OpenSSL library multithreading support
-        CRYPTO_set_locking_callback(NULL);
+        CRYPTO_set_locking_callback(nullptr);
         // Clear the set of locks now to maintain symmetry with the constructor.
         ppmutexOpenSSL.reset();
     }
@@ -173,8 +173,8 @@ static boost::once_flag debugPrintInitFlag = BOOST_ONCE_INIT;
  * the OS/libc. When the shutdown sequence is fully audited and
  * tested, explicit destruction of these objects can be implemented.
  */
-static FILE* fileout = NULL;
-static boost::mutex* mutexDebugLog = NULL;
+static FILE* fileout = nullptr;
+static boost::mutex* mutexDebugLog = nullptr;
 static std::list<std::string>* vMsgsBeforeOpenLog;
 
 static int FileWriteStr(const std::string &str, FILE *fp)
@@ -184,7 +184,7 @@ static int FileWriteStr(const std::string &str, FILE *fp)
 
 static void DebugPrintInit()
 {
-    assert(mutexDebugLog == NULL);
+    assert(mutexDebugLog == nullptr);
     mutexDebugLog = new boost::mutex();
     vMsgsBeforeOpenLog = new std::list<std::string>;
 }
@@ -194,12 +194,12 @@ void OpenDebugLog()
     boost::call_once(&DebugPrintInit, debugPrintInitFlag);
     boost::mutex::scoped_lock scoped_lock(*mutexDebugLog);
 
-    assert(fileout == NULL);
+    assert(fileout == nullptr);
     assert(vMsgsBeforeOpenLog);
     fs::path pathDebug = GetDataDir() / "debug.log";
     fileout = fsbridge::fopen(pathDebug, "a");
     if (fileout) {
-        setbuf(fileout, NULL); // unbuffered
+        setbuf(fileout, nullptr); // unbuffered
         // dump buffered messages from before we opened the log
         while (!vMsgsBeforeOpenLog->empty()) {
             FileWriteStr(vMsgsBeforeOpenLog->front(), fileout);
@@ -208,7 +208,7 @@ void OpenDebugLog()
     }
 
     delete vMsgsBeforeOpenLog;
-    vMsgsBeforeOpenLog = NULL;
+    vMsgsBeforeOpenLog = nullptr;
 }
 
 struct CLogCategoryDesc
@@ -344,7 +344,7 @@ int LogPrintStr(const std::string &str)
         boost::mutex::scoped_lock scoped_lock(*mutexDebugLog);
 
         // buffer if we haven't opened the log yet
-        if (fileout == NULL) {
+        if (fileout == nullptr) {
             assert(vMsgsBeforeOpenLog);
             ret = strTimestamped.length();
             vMsgsBeforeOpenLog->push_back(strTimestamped);
@@ -355,8 +355,8 @@ int LogPrintStr(const std::string &str)
             if (fReopenDebugLog) {
                 fReopenDebugLog = false;
                 fs::path pathDebug = GetDataDir() / "debug.log";
-                if (fsbridge::freopen(pathDebug,"a",fileout) != NULL)
-                    setbuf(fileout, NULL); // unbuffered
+                if (fsbridge::freopen(pathDebug,"a",fileout) != nullptr)
+                    setbuf(fileout, nullptr); // unbuffered
             }
 
             ret = FileWriteStr(strTimestamped, fileout);
@@ -419,49 +419,48 @@ void ArgsManager::ParseParameters(int argc, const char* const argv[])
     }
 }
 
-std::vector<std::string> ArgsManager::GetArgs(const std::string& strArg)
+std::vector<std::string> ArgsManager::GetArgs(const std::string& strArg) const
 {
     LOCK(cs_args);
-    if (IsArgSet(strArg))
-        return mapMultiArgs.at(strArg);
+    auto it = mapMultiArgs.find(strArg);
+    if (it != mapMultiArgs.end()) return it->second;
     return {};
 }
 
-bool ArgsManager::IsArgSet(const std::string& strArg)
+bool ArgsManager::IsArgSet(const std::string& strArg) const
 {
     LOCK(cs_args);
     return mapArgs.count(strArg);
 }
 
-std::string ArgsManager::GetArg(const std::string& strArg, const std::string& strDefault)
+std::string ArgsManager::GetArg(const std::string& strArg, const std::string& strDefault) const
 {
     LOCK(cs_args);
-    if (mapArgs.count(strArg))
-        return mapArgs[strArg];
+    auto it = mapArgs.find(strArg);
+    if (it != mapArgs.end()) return it->second;
     return strDefault;
 }
 
-int64_t ArgsManager::GetArg(const std::string& strArg, int64_t nDefault)
+int64_t ArgsManager::GetArg(const std::string& strArg, int64_t nDefault) const
 {
     LOCK(cs_args);
-    if (mapArgs.count(strArg))
-        return atoi64(mapArgs[strArg]);
+    auto it = mapArgs.find(strArg);
+    if (it != mapArgs.end()) return atoi64(it->second);
     return nDefault;
 }
 
-bool ArgsManager::GetBoolArg(const std::string& strArg, bool fDefault)
+bool ArgsManager::GetBoolArg(const std::string& strArg, bool fDefault) const
 {
     LOCK(cs_args);
-    if (mapArgs.count(strArg))
-        return InterpretBool(mapArgs[strArg]);
+    auto it = mapArgs.find(strArg);
+    if (it != mapArgs.end()) return InterpretBool(it->second);
     return fDefault;
 }
 
 bool ArgsManager::SoftSetArg(const std::string& strArg, const std::string& strValue)
 {
     LOCK(cs_args);
-    if (mapArgs.count(strArg))
-        return false;
+    if (IsArgSet(strArg)) return false;
     ForceSetArg(strArg, strValue);
     return true;
 }
@@ -478,8 +477,7 @@ void ArgsManager::ForceSetArg(const std::string& strArg, const std::string& strV
 {
     LOCK(cs_args);
     mapArgs[strArg] = strValue;
-    mapMultiArgs[strArg].clear();
-    mapMultiArgs[strArg].push_back(strValue);
+    mapMultiArgs[strArg] = {strValue};
 }
 
 
@@ -503,7 +501,7 @@ static std::string FormatException(const std::exception* pex, const char* pszThr
 {
 #ifdef WIN32
     char pszModule[MAX_PATH] = "";
-    GetModuleFileNameA(NULL, pszModule, sizeof(pszModule));
+    GetModuleFileNameA(nullptr, pszModule, sizeof(pszModule));
 #else
     const char* pszModule = "bitcoin";
 #endif
@@ -534,7 +532,7 @@ fs::path GetDefaultDataDir()
 #else
     fs::path pathRet;
     char* pszHome = getenv("HOME");
-    if (pszHome == NULL || strlen(pszHome) == 0)
+    if (pszHome == nullptr || strlen(pszHome) == 0)
         pathRet = fs::path("/");
     else
         pathRet = fs::path(pszHome);
@@ -565,9 +563,8 @@ const fs::path &GetDataDir(bool fNetSpecific)
     {
         //printf("return non-empty path\n");
         return path;
-    }
-    if (IsArgSet("-datadir")) {
-        path = fs::system_complete(GetArg("-datadir", ""));
+    if (gArgs.IsArgSet("-datadir")) {
+        path = fs::system_complete(gArgs.GetArg("-datadir", ""));
         if (!fs::is_directory(path)) {
             path = "";
             //printf("null datadir\n");
@@ -630,7 +627,7 @@ void ArgsManager::ReadConfigFile(const std::string& confPath)
 #ifndef WIN32
 fs::path GetPidFile()
 {
-    fs::path pathPidFile(GetArg("-pid", BITCOIN_PID_FILENAME));
+    fs::path pathPidFile(gArgs.GetArg("-pid", BITCOIN_PID_FILENAME));
     if (!pathPidFile.is_complete()) pathPidFile = GetDataDir() / pathPidFile;
     return pathPidFile;
 }
@@ -794,7 +791,7 @@ void ShrinkDebugFile()
             fclose(file);
         }
     }
-    else if (file != NULL)
+    else if (file != nullptr)
         fclose(file);
 }
 
@@ -803,7 +800,7 @@ fs::path GetSpecialFolderPath(int nFolder, bool fCreate)
 {
     char pszPath[MAX_PATH] = "";
 
-    if(SHGetSpecialFolderPathA(NULL, pszPath, nFolder, fCreate))
+    if(SHGetSpecialFolderPathA(nullptr, pszPath, nFolder, fCreate))
     {
         return fs::path(pszPath);
     }
@@ -815,6 +812,7 @@ fs::path GetSpecialFolderPath(int nFolder, bool fCreate)
 
 void runCommand(const std::string& strCommand)
 {
+    if (strCommand.empty()) return;
     int nErr = ::system(strCommand.c_str());
     if (nErr)
         LogPrintf("runCommand error: system(%s) returned %d\n", strCommand, nErr);
diff --git a/src/util.h b/src/util.h
index e1bdfb198..480a80c0a 100644
--- a/src/util.h
+++ b/src/util.h
@@ -195,13 +195,20 @@ inline bool IsSwitchChar(char c)
 class ArgsManager
 {
 protected:
-    CCriticalSection cs_args;
+    mutable CCriticalSection cs_args;
     std::map<std::string, std::string> mapArgs;
-    std::map<std::string, std::vector<std::string> > mapMultiArgs;
+    std::map<std::string, std::vector<std::string>> mapMultiArgs;
 public:
     void ParseParameters(int argc, const char*const argv[]);
     void ReadConfigFile(const std::string& confPath);
-    std::vector<std::string> GetArgs(const std::string& strArg);
+
+    /**
+     * Return a vector of strings of the given argument
+     *
+     * @param strArg Argument to get (e.g. "-foo")
+     * @return command-line arguments
+     */
+    std::vector<std::string> GetArgs(const std::string& strArg) const;
 
     /**
      * Return true if the given argument has been manually set
@@ -209,7 +216,7 @@ class ArgsManager
      * @param strArg Argument to get (e.g. "-foo")
      * @return true if the argument has been set
      */
-    bool IsArgSet(const std::string& strArg);
+    bool IsArgSet(const std::string& strArg) const;
 
     /**
      * Return string argument or default value
@@ -218,7 +225,7 @@ class ArgsManager
      * @param strDefault (e.g. "1")
      * @return command-line argument or default value
      */
-    std::string GetArg(const std::string& strArg, const std::string& strDefault);
+    std::string GetArg(const std::string& strArg, const std::string& strDefault) const;
 
     /**
      * Return integer argument or default value
@@ -227,7 +234,7 @@ class ArgsManager
      * @param nDefault (e.g. 1)
      * @return command-line argument (0 if invalid number) or default value
      */
-    int64_t GetArg(const std::string& strArg, int64_t nDefault);
+    int64_t GetArg(const std::string& strArg, int64_t nDefault) const;
 
     /**
      * Return boolean argument or default value
@@ -236,7 +243,7 @@ class ArgsManager
      * @param fDefault (true or false)
      * @return command-line argument or default value
      */
-    bool GetBoolArg(const std::string& strArg, bool fDefault);
+    bool GetBoolArg(const std::string& strArg, bool fDefault) const;
 
     /**
      * Set an argument if it doesn't already have a value
@@ -263,52 +270,6 @@ class ArgsManager
 
 extern ArgsManager gArgs;
 
-// wrappers using the global ArgsManager:
-static inline void ParseParameters(int argc, const char*const argv[])
-{
-    gArgs.ParseParameters(argc, argv);
-}
-
-static inline void ReadConfigFile(const std::string& confPath)
-{
-    gArgs.ReadConfigFile(confPath);
-}
-
-static inline bool SoftSetArg(const std::string& strArg, const std::string& strValue)
-{
-    return gArgs.SoftSetArg(strArg, strValue);
-}
-
-static inline void ForceSetArg(const std::string& strArg, const std::string& strValue)
-{
-    gArgs.ForceSetArg(strArg, strValue);
-}
-
-static inline bool IsArgSet(const std::string& strArg)
-{
-    return gArgs.IsArgSet(strArg);
-}
-
-static inline std::string GetArg(const std::string& strArg, const std::string& strDefault)
-{
-    return gArgs.GetArg(strArg, strDefault);
-}
-
-static inline int64_t GetArg(const std::string& strArg, int64_t nDefault)
-{
-    return gArgs.GetArg(strArg, nDefault);
-}
-
-static inline bool GetBoolArg(const std::string& strArg, bool fDefault)
-{
-    return gArgs.GetBoolArg(strArg, fDefault);
-}
-
-static inline bool SoftSetBoolArg(const std::string& strArg, bool fValue)
-{
-    return gArgs.SoftSetBoolArg(strArg, fValue);
-}
-
 /**
  * Format a string to be used as group of options in help messages
  *
@@ -358,7 +319,7 @@ template <typename Callable> void TraceThread(const char* name,  Callable func)
         throw;
     }
     catch (...) {
-        PrintExceptionContinue(NULL, name);
+        PrintExceptionContinue(nullptr, name);
         throw;
     }
 }
diff --git a/src/utilstrencodings.cpp b/src/utilstrencodings.cpp
index 9ee14070a..741680e93 100644
--- a/src/utilstrencodings.cpp
+++ b/src/utilstrencodings.cpp
@@ -65,6 +65,19 @@ bool IsHex(const std::string& str)
     return (str.size() > 0) && (str.size()%2 == 0);
 }
 
+bool IsHexNumber(const std::string& str)
+{
+    size_t starting_location = 0;
+    if (str.size() > 2 && *str.begin() == '0' && *(str.begin()+1) == 'x') {
+        starting_location = 2;
+    }
+    for (auto c : str.substr(starting_location)) {
+        if (HexDigit(c) < 0) return false;
+    }
+    // Return false for empty string or "0x".
+    return (str.size() > starting_location);
+}
+
 std::vector<unsigned char> ParseHex(const char* psz)
 {
     // convert hex dump to vector
@@ -452,7 +465,7 @@ bool ParseInt32(const std::string& str, int32_t *out)
 {
     if (!ParsePrechecks(str))
         return false;
-    char *endp = NULL;
+    char *endp = nullptr;
     errno = 0; // strtol will not set errno if valid
     long int n = strtol(str.c_str(), &endp, 10);
     if(out) *out = (int32_t)n;
@@ -468,7 +481,7 @@ bool ParseInt64(const std::string& str, int64_t *out)
 {
     if (!ParsePrechecks(str))
         return false;
-    char *endp = NULL;
+    char *endp = nullptr;
     errno = 0; // strtoll will not set errno if valid
     long long int n = strtoll(str.c_str(), &endp, 10);
     if(out) *out = (int64_t)n;
@@ -485,7 +498,7 @@ bool ParseUInt32(const std::string& str, uint32_t *out)
         return false;
     if (str.size() >= 1 && str[0] == '-') // Reject negative values, unfortunately strtoul accepts these by default if they fit in the range
         return false;
-    char *endp = NULL;
+    char *endp = nullptr;
     errno = 0; // strtoul will not set errno if valid
     unsigned long int n = strtoul(str.c_str(), &endp, 10);
     if(out) *out = (uint32_t)n;
@@ -502,7 +515,7 @@ bool ParseUInt64(const std::string& str, uint64_t *out)
         return false;
     if (str.size() >= 1 && str[0] == '-') // Reject negative values, unfortunately strtoull accepts these by default if they fit in the range
         return false;
-    char *endp = NULL;
+    char *endp = nullptr;
     errno = 0; // strtoull will not set errno if valid
     unsigned long long int n = strtoull(str.c_str(), &endp, 10);
     if(out) *out = (uint64_t)n;
@@ -583,7 +596,7 @@ int64_t atoi64(const char* psz)
 #ifdef _MSC_VER
     return _atoi64(psz);
 #else
-    return strtoll(psz, NULL, 10);
+    return strtoll(psz, nullptr, 10);
 #endif
 }
 
@@ -592,7 +605,7 @@ int64_t atoi64(const std::string& str)
 #ifdef _MSC_VER
     return _atoi64(str.c_str());
 #else
-    return strtoll(str.c_str(), NULL, 10);
+    return strtoll(str.c_str(), nullptr, 10);
 #endif
 }
 
diff --git a/src/utilstrencodings.h b/src/utilstrencodings.h
index 707fdaad1..af33f0e5f 100644
--- a/src/utilstrencodings.h
+++ b/src/utilstrencodings.h
@@ -38,12 +38,18 @@ std::string SanitizeString(const std::string& str, int rule = SAFE_CHARS_DEFAULT
 std::vector<unsigned char> ParseHex(const char* psz);
 std::vector<unsigned char> ParseHex(const std::string& str);
 signed char HexDigit(char c);
+/* Returns true if each character in str is a hex character, and has an even
+ * number of hex digits.*/
 bool IsHex(const std::string& str);
-std::vector<unsigned char> DecodeBase64(const char* p, bool* pfInvalid = NULL);
+/**
+* Return true if the string is a hex number, optionally prefixed with "0x"
+*/
+bool IsHexNumber(const std::string& str);
+std::vector<unsigned char> DecodeBase64(const char* p, bool* pfInvalid = nullptr);
 std::string DecodeBase64(const std::string& str);
 std::string EncodeBase64(const unsigned char* pch, size_t len);
 std::string EncodeBase64(const std::string& str);
-std::vector<unsigned char> DecodeBase32(const char* p, bool* pfInvalid = NULL);
+std::vector<unsigned char> DecodeBase32(const char* p, bool* pfInvalid = nullptr);
 std::string DecodeBase32(const std::string& str);
 std::string EncodeBase32(const unsigned char* pch, size_t len);
 std::string EncodeBase32(const std::string& str);
@@ -143,4 +149,28 @@ bool TimingResistantEqual(const T& a, const T& b)
  */
 bool ParseFixedPoint(const std::string &val, int decimals, int64_t *amount_out);
 
+/** Convert from one power-of-2 number base to another. */
+template<int frombits, int tobits, bool pad, typename O, typename I>
+bool ConvertBits(O& out, I it, I end) {
+    size_t acc = 0;
+    size_t bits = 0;
+    constexpr size_t maxv = (1 << tobits) - 1;
+    constexpr size_t max_acc = (1 << (frombits + tobits - 1)) - 1;
+    while (it != end) {
+        acc = ((acc << frombits) | *it) & max_acc;
+        bits += frombits;
+        while (bits >= tobits) {
+            bits -= tobits;
+            out.push_back((acc >> bits) & maxv);
+        }
+        ++it;
+    }
+    if (pad) {
+        if (bits) out.push_back((acc << (tobits - bits)) & maxv);
+    } else if (bits >= frombits || ((acc << (tobits - bits)) & maxv)) {
+        return false;
+    }
+    return true;
+}
+
 #endif // BITCOIN_UTILSTRENCODINGS_H
diff --git a/src/utiltime.cpp b/src/utiltime.cpp
index 76367e846..80e1072f2 100644
--- a/src/utiltime.cpp
+++ b/src/utiltime.cpp
@@ -21,7 +21,7 @@ int64_t GetTime()
     int64_t mocktime = nMockTime.load(std::memory_order_relaxed);
     if (mocktime) return mocktime;
 
-    time_t now = time(NULL);
+    time_t now = time(nullptr);
     assert(now > 0);
     return now;
 }
diff --git a/src/validation.cpp b/src/validation.cpp
index 35204e66d..25f50ef2e 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -53,6 +53,9 @@
 # error "Bitcoin cannot be compiled without assertions."
 #endif
 
+#define MICRO 0.000001
+#define MILLI 0.001
+
 /**
  * Global state
  */
@@ -61,12 +64,12 @@ CCriticalSection cs_main;
 
 BlockMap mapBlockIndex;
 CChain chainActive;
-CBlockIndex *pindexBestHeader = NULL;
+CBlockIndex *pindexBestHeader = nullptr;
 CWaitableCriticalSection csBestBlock;
 CConditionVariable cvBlockChange;
 int nScriptCheckThreads = 0;
 std::atomic_bool fImporting(false);
-bool fReindex = false;
+std::atomic_bool fReindex(false);
 bool fTxIndex = false;
 bool fHavePruned = false;
 bool fPruneMode = false;
@@ -80,6 +83,7 @@ int64_t nMaxTipAge = DEFAULT_MAX_TIP_AGE;
 bool fEnableReplacement = DEFAULT_ENABLE_REPLACEMENT;
 
 uint256 hashAssumeValid;
+arith_uint256 nMinimumChainWork;
 
 CFeeRate minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE);
 CAmount maxTxFee = DEFAULT_TRANSACTION_MAXFEE;
@@ -177,9 +181,9 @@ CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& loc
     return chain.Genesis();
 }
 
-CCoinsViewDB *pcoinsdbview = NULL;
-CCoinsViewCache *pcoinsTip = NULL;
-CBlockTreeDB *pblocktree = NULL;
+CCoinsViewDB *pcoinsdbview = nullptr;
+CCoinsViewCache *pcoinsTip = nullptr;
+CBlockTreeDB *pblocktree = nullptr;
 
 enum FlushStateMode {
     FLUSH_STATE_NONE,
@@ -215,7 +219,7 @@ bool CheckFinalTx(const CTransaction &tx, int flags)
     // IsFinalTx() with one more than chainActive.Height().
     const int nBlockHeight = chainActive.Height() + 1;
 
-    // BIP113 will require that time-locked transactions have nLockTime set to
+    // BIP113 requires that time-locked transactions have nLockTime set to
     // less than the median time of the previous block they're contained in.
     // When the next block is created its previous block will be the current
     // chain tip, so we use that to calculate the median time passed to
@@ -251,6 +255,8 @@ bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints* lp, bool
     AssertLockHeld(mempool.cs);
 
     CBlockIndex* tip = chainActive.Tip();
+    assert(tip != nullptr);
+    
     CBlockIndex index;
     index.pprev = tip;
     // CheckSequenceLocks() uses chainActive.Height()+1 to evaluate
@@ -378,7 +384,9 @@ void UpdateMempoolForReorg(DisconnectedBlockTransactions &disconnectpool, bool f
     while (it != disconnectpool.queuedTx.get<insertion_order>().rend()) {
         // ignore validation errors in resurrected transactions
         CValidationState stateDummy;
-        if (!fAddToMempool || (*it)->IsCoinBase() || !AcceptToMemoryPool(mempool, stateDummy, *it, false, NULL, NULL, true)) {
+        if (!fAddToMempool || (*it)->IsCoinBase() ||
+            !AcceptToMemoryPool(mempool, stateDummy, *it, nullptr /* pfMissingInputs */,
+                                nullptr /* plTxnReplaced */, true /* bypass_limits */, 0 /* nAbsurdFee */)) {
             // If the transaction doesn't make it in to the mempool, remove any
             // transactions that depend on it (which would now be orphans).
             mempool.removeRecursive(**it, MemPoolRemovalReason::REORG);
@@ -398,7 +406,7 @@ void UpdateMempoolForReorg(DisconnectedBlockTransactions &disconnectpool, bool f
     // We also need to remove any now-immature transactions
     mempool.removeForReorg(pcoinsTip, chainActive.Tip()->nHeight + 1, STANDARD_LOCKTIME_VERIFY_FLAGS);
     // Re-limit mempool size, in case we added any transactions
-    LimitMempoolSize(mempool, GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000, GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60);
+    LimitMempoolSize(mempool, gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000, gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60);
 }
 
 // Used to avoid mempool polluting consensus critical paths if CCoinsViewMempool
@@ -437,9 +445,9 @@ static bool CheckInputsFromMempoolAndCache(const CTransaction& tx, CValidationSt
     return CheckInputs(tx, state, view, true, flags, cacheSigStore, true, txdata);
 }
 
-static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool& pool, CValidationState& state, const CTransactionRef& ptx, bool fLimitFree,
+static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool& pool, CValidationState& state, const CTransactionRef& ptx,
                               bool* pfMissingInputs, int64_t nAcceptTime, std::list<CTransactionRef>* plTxnReplaced,
-                              bool fOverrideMempoolLimit, const CAmount& nAbsurdFee, std::vector<COutPoint>& coins_to_uncache)
+                              bool bypass_limits, const CAmount& nAbsurdFee, std::vector<COutPoint>& coins_to_uncache)
 {
     const CTransaction& tx = *ptx;
     const uint256 hash = tx.GetHash();
@@ -456,7 +464,7 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
 
     // Reject transactions with witness before segregated witness activates (override with -prematurewitness)
     bool witnessEnabled = IsWitnessEnabled(chainActive.Tip(), chainparams.GetConsensus());
-    if (!GetBoolArg("-prematurewitness", false) && tx.HasWitness() && !witnessEnabled) {
+    if (!gArgs.GetBoolArg("-prematurewitness", false) && tx.HasWitness() && !witnessEnabled) {
         return state.DoS(0, false, REJECT_NONSTANDARD, "no-witness-yet", true);
     }
 
@@ -526,7 +534,6 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
         CCoinsView dummy;
         CCoinsViewCache view(&dummy);
 
-        CAmount nValueIn = 0;
         LockPoints lp;
         {
         LOCK(pool.cs);
@@ -557,8 +564,6 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
         // Bring the best block into scope
         view.GetBestBlock();
 
-        nValueIn = view.GetValueIn(tx);
-
         // we have all inputs cached now, so switch back to dummy, so we don't need to keep lock on mempool
         view.SetBackend(dummy);
 
@@ -569,6 +574,12 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
         // CoinsViewCache instead of create its own
         if (!CheckSequenceLocks(tx, STANDARD_LOCKTIME_VERIFY_FLAGS, &lp))
             return state.DoS(0, false, REJECT_NONSTANDARD, "non-BIP68-final");
+
+        } // end LOCK(pool.cs)
+
+        CAmount nFees = 0;
+        if (!Consensus::CheckTxInputs(tx, state, view, GetSpendHeight(view), nFees)) {
+            return error("%s: Consensus::CheckTxInputs: %s, %s", __func__, tx.GetHash().ToString(), FormatStateMessage(state));
         }
 
         // Check for non-standard pay-to-script-hash in inputs
@@ -581,8 +592,6 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
 
         int64_t nSigOpsCost = GetTransactionSigOpCost(tx, view, STANDARD_SCRIPT_VERIFY_FLAGS);
 
-        CAmount nValueOut = tx.GetValueOut();
-        CAmount nFees = nValueIn-nValueOut;
         // nModifiedFees includes any fee deltas from PrioritiseTransaction
         CAmount nModifiedFees = nFees;
         pool.ApplyDelta(hash, nModifiedFees);
@@ -611,13 +620,13 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
             return state.DoS(0, false, REJECT_NONSTANDARD, "bad-txns-too-many-sigops", false,
                 strprintf("%d", nSigOpsCost));
 
-        CAmount mempoolRejectFee = pool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nSize);
-        if (mempoolRejectFee > 0 && nModifiedFees < mempoolRejectFee) {
+        CAmount mempoolRejectFee = pool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nSize);
+        if (!bypass_limits && mempoolRejectFee > 0 && nModifiedFees < mempoolRejectFee) {
             return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "mempool min fee not met", false, strprintf("%d < %d", nFees, mempoolRejectFee));
         }
 
         // No transactions are allowed below minRelayTxFee except from disconnected blocks
-        if (fLimitFree && nModifiedFees < ::minRelayTxFee.GetFee(nSize)) {
+        if (!bypass_limits && nModifiedFees < ::minRelayTxFee.GetFee(nSize)) {
             return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "min relay fee not met");
         }
 
@@ -628,10 +637,10 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
 
         // Calculate in-mempool ancestors, up to a limit.
         CTxMemPool::setEntries setAncestors;
-        size_t nLimitAncestors = GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
-        size_t nLimitAncestorSize = GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT)*1000;
-        size_t nLimitDescendants = GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
-        size_t nLimitDescendantSize = GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT)*1000;
+        size_t nLimitAncestors = gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
+        size_t nLimitAncestorSize = gArgs.GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT)*1000;
+        size_t nLimitDescendants = gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
+        size_t nLimitDescendantSize = gArgs.GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT)*1000;
         std::string errString;
         if (!pool.CalculateMemPoolAncestors(entry, setAncestors, nLimitAncestors, nLimitAncestorSize, nLimitDescendants, nLimitDescendantSize, errString)) {
             return state.DoS(0, false, REJECT_NONSTANDARD, "too-long-mempool-chain", false, errString);
@@ -783,7 +792,7 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
 
         unsigned int scriptVerifyFlags = STANDARD_SCRIPT_VERIFY_FLAGS;
         if (!chainparams.RequireStandard()) {
-            scriptVerifyFlags = GetArg("-promiscuousmempoolflags", scriptVerifyFlags);
+            scriptVerifyFlags = gArgs.GetArg("-promiscuousmempoolflags", scriptVerifyFlags);
         }
 
         // Check against previous transactions
@@ -849,18 +858,19 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
         }
         pool.RemoveStaged(allConflicting, false, MemPoolRemovalReason::REPLACED);
 
-        // This transaction should only count for fee estimation if it isn't a
-        // BIP 125 replacement transaction (may not be widely supported), the
-        // node is not behind, and the transaction is not dependent on any other
-        // transactions in the mempool.
-        bool validForFeeEstimation = !fReplacementTransaction && IsCurrentForFeeEstimation() && pool.HasNoInputsOf(tx);
+        // This transaction should only count for fee estimation if:
+        // - it isn't a BIP 125 replacement transaction (may not be widely supported)
+        // - it's not being readded during a reorg which bypasses typical mempool fee limits
+        // - the node is not behind
+        // - the transaction is not dependent on any other transactions in the mempool
+        bool validForFeeEstimation = !fReplacementTransaction && !bypass_limits && IsCurrentForFeeEstimation() && pool.HasNoInputsOf(tx);
 
         // Store transaction in memory
         pool.addUnchecked(hash, entry, setAncestors, validForFeeEstimation);
 
         // trim mempool and check if tx was trimmed
-        if (!fOverrideMempoolLimit) {
-            LimitMempoolSize(pool, GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000, GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60);
+        if (!bypass_limits) {
+            LimitMempoolSize(pool, gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000, gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60);
             if (!pool.exists(hash))
                 return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "mempool full");
         }
@@ -872,12 +882,12 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
 }
 
 /** (try to) add transaction to memory pool with a specified acceptance time **/
-static bool AcceptToMemoryPoolWithTime(const CChainParams& chainparams, CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree,
+static bool AcceptToMemoryPoolWithTime(const CChainParams& chainparams, CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx,
                         bool* pfMissingInputs, int64_t nAcceptTime, std::list<CTransactionRef>* plTxnReplaced,
-                        bool fOverrideMempoolLimit, const CAmount nAbsurdFee)
+                        bool bypass_limits, const CAmount nAbsurdFee)
 {
     std::vector<COutPoint> coins_to_uncache;
-    bool res = AcceptToMemoryPoolWorker(chainparams, pool, state, tx, fLimitFree, pfMissingInputs, nAcceptTime, plTxnReplaced, fOverrideMempoolLimit, nAbsurdFee, coins_to_uncache);
+    bool res = AcceptToMemoryPoolWorker(chainparams, pool, state, tx, pfMissingInputs, nAcceptTime, plTxnReplaced, bypass_limits, nAbsurdFee, coins_to_uncache);
     if (!res) {
         for (const COutPoint& hashTx : coins_to_uncache)
             pcoinsTip->Uncache(hashTx);
@@ -888,18 +898,18 @@ static bool AcceptToMemoryPoolWithTime(const CChainParams& chainparams, CTxMemPo
     return res;
 }
 
-bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree,
+bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx,
                         bool* pfMissingInputs, std::list<CTransactionRef>* plTxnReplaced,
-                        bool fOverrideMempoolLimit, const CAmount nAbsurdFee)
+                        bool bypass_limits, const CAmount nAbsurdFee)
 {
     const CChainParams& chainparams = Params();
-    return AcceptToMemoryPoolWithTime(chainparams, pool, state, tx, fLimitFree, pfMissingInputs, GetTime(), plTxnReplaced, fOverrideMempoolLimit, nAbsurdFee);
+    return AcceptToMemoryPoolWithTime(chainparams, pool, state, tx, pfMissingInputs, GetTime(), plTxnReplaced, bypass_limits, nAbsurdFee);
 }
 
 /** Return transaction in txOut, and if it was found inside a block, its hash is placed in hashBlock */
 bool GetTransaction(const uint256 &hash, CTransactionRef &txOut, const Consensus::Params& consensusParams, uint256 &hashBlock, bool fAllowSlow)
 {
-    CBlockIndex *pindexSlow = NULL;
+    CBlockIndex *pindexSlow = nullptr;
 
     LOCK(cs_main);
 
@@ -929,6 +939,9 @@ bool GetTransaction(const uint256 &hash, CTransactionRef &txOut, const Consensus
                 return error("%s: txid mismatch", __func__);
             return true;
         }
+
+        // transaction not found in index, nothing more can be done
+        return false;
     }
 
     if (fAllowSlow) { // use coin database to locate block that contains transaction, and scan it
@@ -1032,8 +1045,6 @@ CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams)
 
 bool IsInitialBlockDownload()
 {
-    const CChainParams& chainParams = Params();
-
     // Once this function has returned false, it must remain false.
     static std::atomic<bool> latchToFalse{false};
     // Optimization: pre-test latch before taking the lock.
@@ -1045,9 +1056,9 @@ bool IsInitialBlockDownload()
         return false;
     if (fImporting || fReindex)
         return true;
-    if (chainActive.Tip() == NULL)
+    if (chainActive.Tip() == nullptr)
         return true;
-    if (chainActive.Tip()->nChainWork < UintToArith256(chainParams.GetConsensus().nMinimumChainWork))
+    if (chainActive.Tip()->nChainWork < nMinimumChainWork)
         return true;
     if (chainActive.Tip()->GetBlockTime() < (GetTime() - nMaxTipAge))
         return true;
@@ -1056,12 +1067,12 @@ bool IsInitialBlockDownload()
     return false;
 }
 
-CBlockIndex *pindexBestForkTip = NULL, *pindexBestForkBase = NULL;
+CBlockIndex *pindexBestForkTip = nullptr, *pindexBestForkBase = nullptr;
 
 static void AlertNotify(const std::string& strMessage)
 {
     uiInterface.NotifyAlertChanged();
-    std::string strCmd = GetArg("-alertnotify", "");
+    std::string strCmd = gArgs.GetArg("-alertnotify", "");
     if (strCmd.empty()) return;
 
     // Alert text should be plain ascii coming from a trusted source, but to
@@ -1086,7 +1097,7 @@ static void CheckForkWarningConditions()
     // If our best fork is no longer within 72 blocks (+/- 12 hours if no one mines it)
     // of our head, drop it
     if (pindexBestForkTip && chainActive.Height() - pindexBestForkTip->nHeight >= 72)
-        pindexBestForkTip = NULL;
+        pindexBestForkTip = nullptr;
 
     if (pindexBestForkTip || (pindexBestInvalid && pindexBestInvalid->nChainWork > chainActive.Tip()->nChainWork + (GetBlockProof(*chainActive.Tip()) * 6)))
     {
@@ -1199,7 +1210,7 @@ void UpdateCoins(const CTransaction& tx, CCoinsViewCache& inputs, int nHeight)
 bool CScriptCheck::operator()() {
     const CScript &scriptSig = ptxTo->vin[nIn].scriptSig;
     const CScriptWitness *witness = &ptxTo->vin[nIn].scriptWitness;
-    return VerifyScript(scriptSig, scriptPubKey, witness, nFlags, CachingTransactionSignatureChecker(ptxTo, nIn, amount, cacheStore, *txdata), &error);
+    return VerifyScript(scriptSig, m_tx_out.scriptPubKey, witness, nFlags, CachingTransactionSignatureChecker(ptxTo, nIn, m_tx_out.nValue, cacheStore, *txdata), &error);
 }
 
 int GetSpendHeight(const CCoinsViewCache& inputs)
@@ -1216,7 +1227,7 @@ static uint256 scriptExecutionCacheNonce(GetRandHash());
 void InitScriptExecutionCache() {
     // nMaxCacheSize is unsigned. If -maxsigcachesize is set to zero,
     // setup_bytes creates the minimum possible cache (2 elements).
-    size_t nMaxCacheSize = std::min(std::max((int64_t)0, GetArg("-maxsigcachesize", DEFAULT_MAX_SIG_CACHE_SIZE) / 2), MAX_MAX_SIG_CACHE_SIZE) * ((size_t) 1 << 20);
+    size_t nMaxCacheSize = std::min(std::max((int64_t)0, gArgs.GetArg("-maxsigcachesize", DEFAULT_MAX_SIG_CACHE_SIZE) / 2), MAX_MAX_SIG_CACHE_SIZE) * ((size_t) 1 << 20);
     size_t nElems = scriptExecutionCache.setup_bytes(nMaxCacheSize);
     LogPrintf("Using %zu MiB out of %zu/2 requested for script execution cache, able to store %zu elements\n",
             (nElems*sizeof(uint256)) >>20, (nMaxCacheSize*2)>>20, nElems);
@@ -1226,7 +1237,7 @@ void InitScriptExecutionCache() {
  * Check whether all inputs of this transaction are valid (no double spends, scripts & sigs, amounts)
  * This does not modify the UTXO set.
  *
- * If pvChecks is not NULL, script checks are pushed onto it instead of being performed inline. Any
+ * If pvChecks is not nullptr, script checks are pushed onto it instead of being performed inline. Any
  * script checks which are not necessary (eg due to script execution cache hits) are, obviously,
  * not pushed onto pvChecks/run.
  *
@@ -1240,9 +1251,6 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
 {
     if (!tx.IsCoinBase())
     {
-        if (!Consensus::CheckTxInputs(tx, state, inputs, GetSpendHeight(inputs)))
-            return false;
-
         if (pvChecks)
             pvChecks->reserve(tx.vin.size());
 
@@ -1281,11 +1289,9 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
                 // a sanity check that our caching is not introducing consensus
                 // failures through additional data in, eg, the coins being
                 // spent being checked as a part of CScriptCheck.
-                const CScript& scriptPubKey = coin.out.scriptPubKey;
-                const CAmount amount = coin.out.nValue;
 
                 // Verify signature
-                CScriptCheck check(scriptPubKey, amount, tx, i, flags, cacheSigStore, &txdata);
+                CScriptCheck check(coin.out, tx, i, flags, cacheSigStore, &txdata);
                 if (pvChecks) {
                     pvChecks->push_back(CScriptCheck());
                     check.swap(pvChecks->back());
@@ -1297,7 +1303,7 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
                         // arguments; if so, don't trigger DoS protection to
                         // avoid splitting the network between upgraded and
                         // non-upgraded nodes.
-                        CScriptCheck check2(scriptPubKey, amount, tx, i,
+                        CScriptCheck check2(coin.out, tx, i,
                                 flags & ~STANDARD_NOT_MANDATORY_VERIFY_FLAGS, cacheSigStore, &txdata);
                         if (check2())
                             return state.Invalid(false, REJECT_NONSTANDARD, strprintf("non-mandatory-script-verify-flag (%s)", ScriptErrorString(check.GetScriptError())));
@@ -1563,7 +1569,7 @@ class WarningBitsConditionChecker : public AbstractThresholdConditionChecker
     int bit;
 
 public:
-    WarningBitsConditionChecker(int bitIn) : bit(bitIn) {}
+    explicit WarningBitsConditionChecker(int bitIn) : bit(bitIn) {}
 
     int64_t BeginTime(const Consensus::Params& params) const override { return 0; }
     int64_t EndTime(const Consensus::Params& params) const override { return std::numeric_limits<int64_t>::max(); }
@@ -1623,6 +1629,7 @@ static int64_t nTimeConnect = 0;
 static int64_t nTimeIndex = 0;
 static int64_t nTimeCallbacks = 0;
 static int64_t nTimeTotal = 0;
+static int64_t nBlocksTotal = 0;
 
 /** Apply the effects of this block (with given index) on the UTXO set represented by coins.
  *  Validity checks that depend on the UTXO set are also done; ConnectBlock()
@@ -1633,7 +1640,7 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
     AssertLockHeld(cs_main);
     assert(pindex);
     // pindex->phashBlock can be null if called by CreateNewBlock/TestBlockValidity
-    assert((pindex->phashBlock == NULL) ||
+    assert((pindex->phashBlock == nullptr) ||
            (*pindex->phashBlock == block.GetHash()));
     int64_t nTimeStart = GetTimeMicros();
 
@@ -1642,7 +1649,7 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
         return error("%s: Consensus::CheckBlock: %s", __func__, FormatStateMessage(state));
 
     // verify that the view's current state corresponds to the previous block
-    uint256 hashPrevBlock = pindex->pprev == NULL ? uint256() : pindex->pprev->GetBlockHash();
+    uint256 hashPrevBlock = pindex->pprev == nullptr ? uint256() : pindex->pprev->GetBlockHash();
     assert(hashPrevBlock == view.GetBestBlock());
 
     // Special case for the genesis block, skipping connection of its transactions
@@ -1653,6 +1660,8 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
         return true;
     }
 
+    nBlocksTotal++;
+
     bool fScriptChecks = true;
     if (!hashAssumeValid.IsNull()) {
         // We've been configured with the hash of a block which has been externally verified to have a valid history.
@@ -1664,7 +1673,7 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
         if (it != mapBlockIndex.end()) {
             if (it->second->GetAncestor(pindex->nHeight) == pindex &&
                 pindexBestHeader->GetAncestor(pindex->nHeight) == pindex &&
-                pindexBestHeader->nChainWork >= UintToArith256(chainparams.GetConsensus().nMinimumChainWork)) {
+                pindexBestHeader->nChainWork >= nMinimumChainWork) {
                 // This block is a member of the assumed verified chain and an ancestor of the best header.
                 // The equivalent time check discourages hash power from extorting the network via DOS attack
                 //  into accepting an invalid block through telling users they must manually set assumevalid.
@@ -1680,7 +1689,7 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
     }
 
     int64_t nTime1 = GetTimeMicros(); nTimeCheck += nTime1 - nTimeStart;
-    LogPrint(BCLog::BENCH, "    - Sanity checks: %.2fms [%.2fs]\n", 0.001 * (nTime1 - nTimeStart), nTimeCheck * 0.000001);
+    LogPrint(BCLog::BENCH, "    - Sanity checks: %.2fms [%.2fs (%.2fms/blk)]\n", MILLI * (nTime1 - nTimeStart), nTimeCheck * MICRO, nTimeCheck * MILLI / nBlocksTotal);
 
     // Do not allow blocks that contain transactions which 'overwrite' older transactions,
     // unless those are already completely spent.
@@ -1704,6 +1713,7 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
     // before the first had been spent.  Since those coinbases are sufficiently buried its no longer possible to create further
     // duplicate transactions descending from the known pairs either.
     // If we're on the known chain at height greater than where BIP34 activated, we can save the db accesses needed for the BIP30 check.
+    assert(pindex->pprev);
     CBlockIndex *pindexBIP34height = pindex->pprev->GetAncestor(chainparams.GetConsensus().BIP34Height);
     //Only continue to enforce if we're below BIP34 activation height or the block hash at that height doesn't correspond.
     fEnforceBIP30 = fEnforceBIP30 && (!pindexBIP34height || !(pindexBIP34height->GetBlockHash() == chainparams.GetConsensus().BIP34Hash));
@@ -1729,11 +1739,11 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
     unsigned int flags = GetBlockScriptFlags(pindex, chainparams.GetConsensus());
 
     int64_t nTime2 = GetTimeMicros(); nTimeForks += nTime2 - nTime1;
-    LogPrint(BCLog::BENCH, "    - Fork checks: %.2fms [%.2fs]\n", 0.001 * (nTime2 - nTime1), nTimeForks * 0.000001);
+    LogPrint(BCLog::BENCH, "    - Fork checks: %.2fms [%.2fs (%.2fms/blk)]\n", MILLI * (nTime2 - nTime1), nTimeForks * MICRO, nTimeForks * MILLI / nBlocksTotal);
 
     CBlockUndo blockundo;
 
-    CCheckQueueControl<CScriptCheck> control(fScriptChecks && nScriptCheckThreads ? &scriptcheckqueue : NULL);
+    CCheckQueueControl<CScriptCheck> control(fScriptChecks && nScriptCheckThreads ? &scriptcheckqueue : nullptr);
 
     std::vector<int> prevheights;
     CAmount nFees = 0;
@@ -1753,9 +1763,15 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
 
         if (!tx.IsCoinBase())
         {
-            if (!view.HaveInputs(tx))
-                return state.DoS(100, error("ConnectBlock(): inputs missing/spent"),
-                                 REJECT_INVALID, "bad-txns-inputs-missingorspent");
+            CAmount txfee = 0;
+            if (!Consensus::CheckTxInputs(tx, state, view, pindex->nHeight, txfee)) {
+                return error("%s: Consensus::CheckTxInputs: %s, %s", __func__, tx.GetHash().ToString(), FormatStateMessage(state));
+            }
+            nFees += txfee;
+            if (!MoneyRange(nFees)) {
+                return state.DoS(100, error("%s: accumulated fee in the block out of range.", __func__),
+                                 REJECT_INVALID, "bad-txns-accumulated-fee-outofrange");
+            }
 
             // Check that transaction is BIP68 final
             // BIP68 lock checks (as opposed to nLockTime checks) must
@@ -1783,11 +1799,9 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
         txdata.emplace_back(tx);
         if (!tx.IsCoinBase())
         {
-            nFees += view.GetValueIn(tx)-tx.GetValueOut();
-
             std::vector<CScriptCheck> vChecks;
             bool fCacheResults = fJustCheck; /* Don't cache results if we're actually connecting blocks (still consult the cache, though) */
-            if (!CheckInputs(tx, state, view, fScriptChecks, flags, fCacheResults, fCacheResults, txdata[i], nScriptCheckThreads ? &vChecks : NULL))
+            if (!CheckInputs(tx, state, view, fScriptChecks, flags, fCacheResults, fCacheResults, txdata[i], nScriptCheckThreads ? &vChecks : nullptr))
                 return error("ConnectBlock(): CheckInputs on %s failed with %s",
                     tx.GetHash().ToString(), FormatStateMessage(state));
             control.Add(vChecks);
@@ -1803,7 +1817,7 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
         pos.nTxOffset += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION);
     }
     int64_t nTime3 = GetTimeMicros(); nTimeConnect += nTime3 - nTime2;
-    LogPrint(BCLog::BENCH, "      - Connect %u transactions: %.2fms (%.3fms/tx, %.3fms/txin) [%.2fs]\n", (unsigned)block.vtx.size(), 0.001 * (nTime3 - nTime2), 0.001 * (nTime3 - nTime2) / block.vtx.size(), nInputs <= 1 ? 0 : 0.001 * (nTime3 - nTime2) / (nInputs-1), nTimeConnect * 0.000001);
+    LogPrint(BCLog::BENCH, "      - Connect %u transactions: %.2fms (%.3fms/tx, %.3fms/txin) [%.2fs (%.2fms/blk)]\n", (unsigned)block.vtx.size(), MILLI * (nTime3 - nTime2), MILLI * (nTime3 - nTime2) / block.vtx.size(), nInputs <= 1 ? 0 : MILLI * (nTime3 - nTime2) / (nInputs-1), nTimeConnect * MICRO, nTimeConnect * MILLI / nBlocksTotal);
 
     CAmount blockReward = nFees + GetBlockSubsidy(pindex->nHeight, chainparams.GetConsensus());
     if (block.vtx[0]->GetValueOut() > blockReward)
@@ -1815,7 +1829,7 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
     if (!control.Wait())
         return state.DoS(100, error("%s: CheckQueue failed", __func__), REJECT_INVALID, "block-validation-failed");
     int64_t nTime4 = GetTimeMicros(); nTimeVerify += nTime4 - nTime2;
-    LogPrint(BCLog::BENCH, "    - Verify %u txins: %.2fms (%.3fms/txin) [%.2fs]\n", nInputs - 1, 0.001 * (nTime4 - nTime2), nInputs <= 1 ? 0 : 0.001 * (nTime4 - nTime2) / (nInputs-1), nTimeVerify * 0.000001);
+    LogPrint(BCLog::BENCH, "    - Verify %u txins: %.2fms (%.3fms/txin) [%.2fs (%.2fms/blk)]\n", nInputs - 1, MILLI * (nTime4 - nTime2), nInputs <= 1 ? 0 : MILLI * (nTime4 - nTime2) / (nInputs-1), nTimeVerify * MICRO, nTimeVerify * MILLI / nBlocksTotal);
 
     if (fJustCheck)
         return true;
@@ -1843,14 +1857,15 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
         if (!pblocktree->WriteTxIndex(vPos))
             return AbortNode(state, "Failed to write transaction index");
 
+    assert(pindex->phashBlock);
     // add this block to the view's block chain
     view.SetBestBlock(pindex->GetBlockHash());
 
     int64_t nTime5 = GetTimeMicros(); nTimeIndex += nTime5 - nTime4;
-    LogPrint(BCLog::BENCH, "    - Index writing: %.2fms [%.2fs]\n", 0.001 * (nTime5 - nTime4), nTimeIndex * 0.000001);
+    LogPrint(BCLog::BENCH, "    - Index writing: %.2fms [%.2fs (%.2fms/blk)]\n", MILLI * (nTime5 - nTime4), nTimeIndex * MICRO, nTimeIndex * MILLI / nBlocksTotal);
 
     int64_t nTime6 = GetTimeMicros(); nTimeCallbacks += nTime6 - nTime5;
-    LogPrint(BCLog::BENCH, "    - Callbacks: %.2fms [%.2fs]\n", 0.001 * (nTime6 - nTime5), nTimeCallbacks * 0.000001);
+    LogPrint(BCLog::BENCH, "    - Callbacks: %.2fms [%.2fs (%.2fms/blk)]\n", MILLI * (nTime6 - nTime5), nTimeCallbacks * MICRO, nTimeCallbacks * MILLI / nBlocksTotal);
 
     return true;
 }
@@ -1863,95 +1878,100 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
  */
 bool static FlushStateToDisk(const CChainParams& chainparams, CValidationState &state, FlushStateMode mode, int nManualPruneHeight) {
     int64_t nMempoolUsage = mempool.DynamicMemoryUsage();
-    LOCK2(cs_main, cs_LastBlockFile);
+    LOCK(cs_main);
     static int64_t nLastWrite = 0;
     static int64_t nLastFlush = 0;
     static int64_t nLastSetChain = 0;
     std::set<int> setFilesToPrune;
     bool fFlushForPrune = false;
+    bool fDoFullFlush = false;
+    int64_t nNow = 0;
     try {
-    if (fPruneMode && (fCheckForPruning || nManualPruneHeight > 0) && !fReindex) {
-        if (nManualPruneHeight > 0) {
-            FindFilesToPruneManual(setFilesToPrune, nManualPruneHeight);
-        } else {
-            FindFilesToPrune(setFilesToPrune, chainparams.PruneAfterHeight());
-            fCheckForPruning = false;
-        }
-        if (!setFilesToPrune.empty()) {
-            fFlushForPrune = true;
-            if (!fHavePruned) {
-                pblocktree->WriteFlag("prunedblockfiles", true);
-                fHavePruned = true;
-            }
-        }
-    }
-    int64_t nNow = GetTimeMicros();
-    // Avoid writing/flushing immediately after startup.
-    if (nLastWrite == 0) {
-        nLastWrite = nNow;
-    }
-    if (nLastFlush == 0) {
-        nLastFlush = nNow;
-    }
-    if (nLastSetChain == 0) {
-        nLastSetChain = nNow;
-    }
-    int64_t nMempoolSizeMax = GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
-    int64_t cacheSize = pcoinsTip->DynamicMemoryUsage();
-    int64_t nTotalSpace = nCoinCacheUsage + std::max<int64_t>(nMempoolSizeMax - nMempoolUsage, 0);
-    // The cache is large and we're within 10% and 10 MiB of the limit, but we have time now (not in the middle of a block processing).
-    bool fCacheLarge = mode == FLUSH_STATE_PERIODIC && cacheSize > std::max((9 * nTotalSpace) / 10, nTotalSpace - MAX_BLOCK_COINSDB_USAGE * 1024 * 1024);
-    // The cache is over the limit, we have to write now.
-    bool fCacheCritical = mode == FLUSH_STATE_IF_NEEDED && cacheSize > nTotalSpace;
-    // It's been a while since we wrote the block index to disk. Do this frequently, so we don't need to redownload after a crash.
-    bool fPeriodicWrite = mode == FLUSH_STATE_PERIODIC && nNow > nLastWrite + (int64_t)DATABASE_WRITE_INTERVAL * 1000000;
-    // It's been very long since we flushed the cache. Do this infrequently, to optimize cache usage.
-    bool fPeriodicFlush = mode == FLUSH_STATE_PERIODIC && nNow > nLastFlush + (int64_t)DATABASE_FLUSH_INTERVAL * 1000000;
-    // Combine all conditions that result in a full cache flush.
-    bool fDoFullFlush = (mode == FLUSH_STATE_ALWAYS) || fCacheLarge || fCacheCritical || fPeriodicFlush || fFlushForPrune;
-    // Write blocks and block index to disk.
-    if (fDoFullFlush || fPeriodicWrite) {
-        // Depend on nMinDiskSpace to ensure we can write block index
-        if (!CheckDiskSpace(0))
-            return state.Error("out of disk space");
-        // First make sure all block and undo data is flushed to disk.
-        FlushBlockFile();
-        // Then update all block file information (which may refer to block and undo files).
-        {
-            std::vector<std::pair<int, const CBlockFileInfo*> > vFiles;
-            vFiles.reserve(setDirtyFileInfo.size());
-            for (std::set<int>::iterator it = setDirtyFileInfo.begin(); it != setDirtyFileInfo.end(); ) {
-                vFiles.push_back(std::make_pair(*it, &vinfoBlockFile[*it]));
-                setDirtyFileInfo.erase(it++);
+    {
+        LOCK(cs_LastBlockFile);
+        if (fPruneMode && (fCheckForPruning || nManualPruneHeight > 0) && !fReindex) {
+            if (nManualPruneHeight > 0) {
+                FindFilesToPruneManual(setFilesToPrune, nManualPruneHeight);
+            } else {
+                FindFilesToPrune(setFilesToPrune, chainparams.PruneAfterHeight());
+                fCheckForPruning = false;
             }
-            std::vector<const CBlockIndex*> vBlocks;
-            vBlocks.reserve(setDirtyBlockIndex.size());
-            for (std::set<CBlockIndex*>::iterator it = setDirtyBlockIndex.begin(); it != setDirtyBlockIndex.end(); ) {
-                vBlocks.push_back(*it);
-                setDirtyBlockIndex.erase(it++);
+            if (!setFilesToPrune.empty()) {
+                fFlushForPrune = true;
+                if (!fHavePruned) {
+                    pblocktree->WriteFlag("prunedblockfiles", true);
+                    fHavePruned = true;
+                }
             }
-            if (!pblocktree->WriteBatchSync(vFiles, nLastBlockFile, vBlocks)) {
-                return AbortNode(state, "Failed to write to block index database");
+        }
+        nNow = GetTimeMicros();
+        // Avoid writing/flushing immediately after startup.
+        if (nLastWrite == 0) {
+            nLastWrite = nNow;
+        }
+        if (nLastFlush == 0) {
+            nLastFlush = nNow;
+        }
+        if (nLastSetChain == 0) {
+            nLastSetChain = nNow;
+        }
+        int64_t nMempoolSizeMax = gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
+        int64_t cacheSize = pcoinsTip->DynamicMemoryUsage();
+        int64_t nTotalSpace = nCoinCacheUsage + std::max<int64_t>(nMempoolSizeMax - nMempoolUsage, 0);
+        // The cache is large and we're within 10% and 10 MiB of the limit, but we have time now (not in the middle of a block processing).
+        bool fCacheLarge = mode == FLUSH_STATE_PERIODIC && cacheSize > std::max((9 * nTotalSpace) / 10, nTotalSpace - MAX_BLOCK_COINSDB_USAGE * 1024 * 1024);
+        // The cache is over the limit, we have to write now.
+        bool fCacheCritical = mode == FLUSH_STATE_IF_NEEDED && cacheSize > nTotalSpace;
+        // It's been a while since we wrote the block index to disk. Do this frequently, so we don't need to redownload after a crash.
+        bool fPeriodicWrite = mode == FLUSH_STATE_PERIODIC && nNow > nLastWrite + (int64_t)DATABASE_WRITE_INTERVAL * 1000000;
+        // It's been very long since we flushed the cache. Do this infrequently, to optimize cache usage.
+        bool fPeriodicFlush = mode == FLUSH_STATE_PERIODIC && nNow > nLastFlush + (int64_t)DATABASE_FLUSH_INTERVAL * 1000000;
+        // Combine all conditions that result in a full cache flush.
+        fDoFullFlush = (mode == FLUSH_STATE_ALWAYS) || fCacheLarge || fCacheCritical || fPeriodicFlush || fFlushForPrune;
+        // Write blocks and block index to disk.
+        if (fDoFullFlush || fPeriodicWrite) {
+            // Depend on nMinDiskSpace to ensure we can write block index
+            if (!CheckDiskSpace(0))
+                return state.Error("out of disk space");
+            // First make sure all block and undo data is flushed to disk.
+            FlushBlockFile();
+            // Then update all block file information (which may refer to block and undo files).
+            {
+                std::vector<std::pair<int, const CBlockFileInfo*> > vFiles;
+                vFiles.reserve(setDirtyFileInfo.size());
+                for (std::set<int>::iterator it = setDirtyFileInfo.begin(); it != setDirtyFileInfo.end(); ) {
+                    vFiles.push_back(std::make_pair(*it, &vinfoBlockFile[*it]));
+                    setDirtyFileInfo.erase(it++);
+                }
+                std::vector<const CBlockIndex*> vBlocks;
+                vBlocks.reserve(setDirtyBlockIndex.size());
+                for (std::set<CBlockIndex*>::iterator it = setDirtyBlockIndex.begin(); it != setDirtyBlockIndex.end(); ) {
+                    vBlocks.push_back(*it);
+                    setDirtyBlockIndex.erase(it++);
+                }
+                if (!pblocktree->WriteBatchSync(vFiles, nLastBlockFile, vBlocks)) {
+                    return AbortNode(state, "Failed to write to block index database");
+                }
             }
+            // Finally remove any pruned files
+            if (fFlushForPrune)
+                UnlinkPrunedFiles(setFilesToPrune);
+            nLastWrite = nNow;
+        }
+        // Flush best chain related state. This can only be done if the blocks / block index write was also done.
+        if (fDoFullFlush) {
+            // Typical Coin structures on disk are around 48 bytes in size.
+            // Pushing a new one to the database can cause it to be written
+            // twice (once in the log, and once in the tables). This is already
+            // an overestimation, as most will delete an existing entry or
+            // overwrite one. Still, use a conservative safety factor of 2.
+            if (!CheckDiskSpace(48 * 2 * 2 * pcoinsTip->GetCacheSize()))
+                return state.Error("out of disk space");
+            // Flush the chainstate (which may refer to block index entries).
+            if (!pcoinsTip->Flush())
+                return AbortNode(state, "Failed to write to coin database");
+            nLastFlush = nNow;
         }
-        // Finally remove any pruned files
-        if (fFlushForPrune)
-            UnlinkPrunedFiles(setFilesToPrune);
-        nLastWrite = nNow;
-    }
-    // Flush best chain related state. This can only be done if the blocks / block index write was also done.
-    if (fDoFullFlush) {
-        // Typical Coin structures on disk are around 48 bytes in size.
-        // Pushing a new one to the database can cause it to be written
-        // twice (once in the log, and once in the tables). This is already
-        // an overestimation, as most will delete an existing entry or
-        // overwrite one. Still, use a conservative safety factor of 2.
-        if (!CheckDiskSpace(48 * 2 * 2 * pcoinsTip->GetCacheSize()))
-            return state.Error("out of disk space");
-        // Flush the chainstate (which may refer to block index entries).
-        if (!pcoinsTip->Flush())
-            return AbortNode(state, "Failed to write to coin database");
-        nLastFlush = nNow;
     }
     if (fDoFullFlush || ((mode == FLUSH_STATE_ALWAYS || mode == FLUSH_STATE_PERIODIC) && nNow > nLastSetChain + (int64_t)DATABASE_WRITE_INTERVAL * 1000000)) {
         // Update best block in wallet (so we can detect restored wallets).
@@ -2014,7 +2034,7 @@ void static UpdateTip(CBlockIndex *pindexNew, const CChainParams& chainParams) {
             }
         }
         // Check the version of the last 100 blocks to see if we need to upgrade:
-        for (int i = 0; i < 100 && pindex != NULL; i++)
+        for (int i = 0; i < 100 && pindex != nullptr; i++)
         {
             int32_t nExpectedVersion = ComputeBlockVersion(pindex->pprev, chainParams.GetConsensus());
             if (pindex->nVersion > VERSIONBITS_LAST_OLD_BLOCK_VERSION && (pindex->nVersion & ~nExpectedVersion) != 0)
@@ -2047,7 +2067,7 @@ void static UpdateTip(CBlockIndex *pindexNew, const CChainParams& chainParams) {
   * should make the mempool consistent again by calling UpdateMempoolForReorg.
   * with cs_main held.
   *
-  * If disconnectpool is NULL, then no disconnected transactions are added to
+  * If disconnectpool is nullptr, then no disconnected transactions are added to
   * disconnectpool (note that the caller is responsible for mempool consistency
   * in any case).
   */
@@ -2070,7 +2090,7 @@ bool static DisconnectTip(CValidationState& state, const CChainParams& chainpara
         bool flushed = view.Flush();
         assert(flushed);
     }
-    LogPrint(BCLog::BENCH, "- Disconnect block: %.2fms\n", (GetTimeMicros() - nStart) * 0.001);
+    LogPrint(BCLog::BENCH, "- Disconnect block: %.2fms\n", (GetTimeMicros() - nStart) * MILLI);
     // Write the chain state to disk, if necessary.
     if (!FlushStateToDisk(chainparams, state, FLUSH_STATE_IF_NEEDED))
         return false;
@@ -2103,7 +2123,7 @@ static int64_t nTimeChainState = 0;
 static int64_t nTimePostConnect = 0;
 
 struct PerBlockConnectTrace {
-    CBlockIndex* pindex = NULL;
+    CBlockIndex* pindex = nullptr;
     std::shared_ptr<const CBlock> pblock;
     std::shared_ptr<std::vector<CTransactionRef>> conflictedTxs;
     PerBlockConnectTrace() : conflictedTxs(std::make_shared<std::vector<CTransactionRef>>()) {}
@@ -2130,7 +2150,7 @@ class ConnectTrace {
     CTxMemPool &pool;
 
 public:
-    ConnectTrace(CTxMemPool &_pool) : blocksConnected(1), pool(_pool) {
+    explicit ConnectTrace(CTxMemPool &_pool) : blocksConnected(1), pool(_pool) {
         pool.NotifyEntryRemoved.connect(boost::bind(&ConnectTrace::NotifyEntryRemoved, this, _1, _2));
     }
 
@@ -2168,7 +2188,7 @@ class ConnectTrace {
 };
 
 /**
- * Connect a new block to chainActive. pblock is either NULL or a pointer to a CBlock
+ * Connect a new block to chainActive. pblock is either nullptr or a pointer to a CBlock
  * corresponding to pindexNew, to bypass loading it again from disk.
  *
  * The block is added to connectTrace if connection succeeds.
@@ -2191,7 +2211,7 @@ bool static ConnectTip(CValidationState& state, const CChainParams& chainparams,
     // Apply the block atomically to the chain state.
     int64_t nTime2 = GetTimeMicros(); nTimeReadFromDisk += nTime2 - nTime1;
     int64_t nTime3;
-    LogPrint(BCLog::BENCH, "  - Load block from disk: %.2fms [%.2fs]\n", (nTime2 - nTime1) * 0.001, nTimeReadFromDisk * 0.000001);
+    LogPrint(BCLog::BENCH, "  - Load block from disk: %.2fms [%.2fs]\n", (nTime2 - nTime1) * MILLI, nTimeReadFromDisk * MICRO);
     {
         CCoinsViewCache view(pcoinsTip);
         bool rv = ConnectBlock(blockConnecting, state, pindexNew, view, chainparams);
@@ -2202,17 +2222,17 @@ bool static ConnectTip(CValidationState& state, const CChainParams& chainparams,
             return error("ConnectTip(): ConnectBlock %s failed", pindexNew->GetBlockHash().ToString());
         }
         nTime3 = GetTimeMicros(); nTimeConnectTotal += nTime3 - nTime2;
-        LogPrint(BCLog::BENCH, "  - Connect total: %.2fms [%.2fs]\n", (nTime3 - nTime2) * 0.001, nTimeConnectTotal * 0.000001);
+        LogPrint(BCLog::BENCH, "  - Connect total: %.2fms [%.2fs (%.2fms/blk)]\n", (nTime3 - nTime2) * MILLI, nTimeConnectTotal * MICRO, nTimeConnectTotal * MILLI / nBlocksTotal);
         bool flushed = view.Flush();
         assert(flushed);
     }
     int64_t nTime4 = GetTimeMicros(); nTimeFlush += nTime4 - nTime3;
-    LogPrint(BCLog::BENCH, "  - Flush: %.2fms [%.2fs]\n", (nTime4 - nTime3) * 0.001, nTimeFlush * 0.000001);
+    LogPrint(BCLog::BENCH, "  - Flush: %.2fms [%.2fs (%.2fms/blk)]\n", (nTime4 - nTime3) * MILLI, nTimeFlush * MICRO, nTimeFlush * MILLI / nBlocksTotal);
     // Write the chain state to disk, if necessary.
     if (!FlushStateToDisk(chainparams, state, FLUSH_STATE_IF_NEEDED))
         return false;
     int64_t nTime5 = GetTimeMicros(); nTimeChainState += nTime5 - nTime4;
-    LogPrint(BCLog::BENCH, "  - Writing chainstate: %.2fms [%.2fs]\n", (nTime5 - nTime4) * 0.001, nTimeChainState * 0.000001);
+    LogPrint(BCLog::BENCH, "  - Writing chainstate: %.2fms [%.2fs (%.2fms/blk)]\n", (nTime5 - nTime4) * MILLI, nTimeChainState * MICRO, nTimeChainState * MILLI / nBlocksTotal);
     // Remove conflicting transactions from the mempool.;
     mempool.removeForBlock(blockConnecting.vtx, pindexNew->nHeight);
     disconnectpool.removeForBlock(blockConnecting.vtx);
@@ -2220,8 +2240,8 @@ bool static ConnectTip(CValidationState& state, const CChainParams& chainparams,
     UpdateTip(pindexNew, chainparams);
 
     int64_t nTime6 = GetTimeMicros(); nTimePostConnect += nTime6 - nTime5; nTimeTotal += nTime6 - nTime1;
-    LogPrint(BCLog::BENCH, "  - Connect postprocess: %.2fms [%.2fs]\n", (nTime6 - nTime5) * 0.001, nTimePostConnect * 0.000001);
-    LogPrint(BCLog::BENCH, "- Connect block: %.2fms [%.2fs]\n", (nTime6 - nTime1) * 0.001, nTimeTotal * 0.000001);
+    LogPrint(BCLog::BENCH, "  - Connect postprocess: %.2fms [%.2fs (%.2fms/blk)]\n", (nTime6 - nTime5) * MILLI, nTimePostConnect * MICRO, nTimePostConnect * MILLI / nBlocksTotal);
+    LogPrint(BCLog::BENCH, "- Connect block: %.2fms [%.2fs (%.2fms/blk)]\n", (nTime6 - nTime1) * MILLI, nTimeTotal * MICRO, nTimeTotal * MILLI / nBlocksTotal);
 
     connectTrace.BlockConnected(pindexNew, std::move(pthisBlock));
     return true;
@@ -2233,13 +2253,13 @@ bool static ConnectTip(CValidationState& state, const CChainParams& chainparams,
  */
 static CBlockIndex* FindMostWorkChain() {
     do {
-        CBlockIndex *pindexNew = NULL;
+        CBlockIndex *pindexNew = nullptr;
 
         // Find the best candidate header.
         {
             std::set<CBlockIndex*, CBlockIndexWorkComparator>::reverse_iterator it = setBlockIndexCandidates.rbegin();
             if (it == setBlockIndexCandidates.rend())
-                return NULL;
+                return nullptr;
             pindexNew = *it;
         }
 
@@ -2258,7 +2278,7 @@ static CBlockIndex* FindMostWorkChain() {
             bool fMissingData = !(pindexTest->nStatus & BLOCK_HAVE_DATA);
             if (fFailedChain || fMissingData) {
                 // Candidate chain is not usable (either invalid or missing data)
-                if (fFailedChain && (pindexBestInvalid == NULL || pindexNew->nChainWork > pindexBestInvalid->nChainWork))
+                if (fFailedChain && (pindexBestInvalid == nullptr || pindexNew->nChainWork > pindexBestInvalid->nChainWork))
                     pindexBestInvalid = pindexNew;
                 CBlockIndex *pindexFailed = pindexNew;
                 // Remove the entire chain from the set.
@@ -2299,7 +2319,7 @@ static void PruneBlockIndexCandidates() {
 
 /**
  * Try to make some progress towards making pindexMostWork the active block.
- * pblock is either NULL or a pointer to a CBlock corresponding to pindexMostWork.
+ * pblock is either nullptr or a pointer to a CBlock corresponding to pindexMostWork.
  */
 static bool ActivateBestChainStep(CValidationState& state, const CChainParams& chainparams, CBlockIndex* pindexMostWork, const std::shared_ptr<const CBlock>& pblock, bool& fInvalidFound, ConnectTrace& connectTrace)
 {
@@ -2385,8 +2405,8 @@ static bool ActivateBestChainStep(CValidationState& state, const CChainParams& c
 static void NotifyHeaderTip() {
     bool fNotify = false;
     bool fInitialBlockDownload = false;
-    static CBlockIndex* pindexHeaderOld = NULL;
-    CBlockIndex* pindexHeader = NULL;
+    static CBlockIndex* pindexHeaderOld = nullptr;
+    CBlockIndex* pindexHeader = nullptr;
     {
         LOCK(cs_main);
         pindexHeader = pindexBestHeader;
@@ -2405,7 +2425,7 @@ static void NotifyHeaderTip() {
 
 /**
  * Make the best chain active, in multiple steps. The result is either failure
- * or an activated best chain. pblock is either NULL or a pointer to a block
+ * or an activated best chain. pblock is either nullptr or a pointer to a block
  * that is already loaded (to avoid loading it again from disk).
  */
 bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams, std::shared_ptr<const CBlock> pblock) {
@@ -2414,9 +2434,9 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
     // us in the middle of ProcessNewBlock - do not assume pblock is set
     // sanely for performance or correctness!
 
-    CBlockIndex *pindexMostWork = NULL;
-    CBlockIndex *pindexNewTip = NULL;
-    int nStopAtHeight = GetArg("-stopatheight", DEFAULT_STOPATHEIGHT);
+    CBlockIndex *pindexMostWork = nullptr;
+    CBlockIndex *pindexNewTip = nullptr;
+    int nStopAtHeight = gArgs.GetArg("-stopatheight", DEFAULT_STOPATHEIGHT);
     do {
         boost::this_thread::interruption_point();
         if (ShutdownRequested())
@@ -2429,12 +2449,12 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
             ConnectTrace connectTrace(mempool); // Destructed before cs_main is unlocked
 
             CBlockIndex *pindexOldTip = chainActive.Tip();
-            if (pindexMostWork == NULL) {
+            if (pindexMostWork == nullptr) {
                 pindexMostWork = FindMostWorkChain();
             }
 
             // Whether we have anything to do at all.
-            if (pindexMostWork == NULL || pindexMostWork == chainActive.Tip())
+            if (pindexMostWork == nullptr || pindexMostWork == chainActive.Tip())
                 return true;
 
             bool fInvalidFound = false;
@@ -2444,7 +2464,7 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
 
             if (fInvalidFound) {
                 // Wipe cache, we may need another branch now.
-                pindexMostWork = NULL;
+                pindexMostWork = nullptr;
             }
             pindexNewTip = chainActive.Tip();
             pindexFork = chainActive.FindFork(pindexOldTip);
@@ -2569,14 +2589,14 @@ bool ResetBlockFailureFlags(CBlockIndex *pindex) {
             }
             if (it->second == pindexBestInvalid) {
                 // Reset invalid block marker if it was pointing to one of those.
-                pindexBestInvalid = NULL;
+                pindexBestInvalid = nullptr;
             }
         }
         it++;
     }
 
     // Remove the invalidity flag from all ancestors too.
-    while (pindex != NULL) {
+    while (pindex != nullptr) {
         if (pindex->nStatus & BLOCK_FAILED_MASK) {
             pindex->nStatus &= ~BLOCK_FAILED_MASK;
             setDirtyBlockIndex.insert(pindex);
@@ -2596,7 +2616,6 @@ static CBlockIndex* AddToBlockIndex(const CBlockHeader& block)
 
     // Construct new block index object
     CBlockIndex* pindexNew = new CBlockIndex(block);
-    assert(pindexNew);
     // We assign the sequence id to blocks only when the full data is available,
     // to avoid miners withholding blocks but broadcasting headers, to get a
     // competitive advantage.
@@ -2613,7 +2632,7 @@ static CBlockIndex* AddToBlockIndex(const CBlockHeader& block)
     pindexNew->nTimeMax = (pindexNew->pprev ? std::max(pindexNew->pprev->nTimeMax, pindexNew->nTime) : pindexNew->nTime);
     pindexNew->nChainWork = (pindexNew->pprev ? pindexNew->pprev->nChainWork : 0) + GetBlockProof(*pindexNew);
     pindexNew->RaiseValidity(BLOCK_VALID_TREE);
-    if (pindexBestHeader == NULL || pindexBestHeader->nChainWork < pindexNew->nChainWork)
+    if (pindexBestHeader == nullptr || pindexBestHeader->nChainWork < pindexNew->nChainWork)
         pindexBestHeader = pindexNew;
 
     setDirtyBlockIndex.insert(pindexNew);
@@ -2636,7 +2655,7 @@ static bool ReceivedBlockTransactions(const CBlock &block, CValidationState& sta
     pindexNew->RaiseValidity(BLOCK_VALID_TRANSACTIONS);
     setDirtyBlockIndex.insert(pindexNew);
 
-    if (pindexNew->pprev == NULL || pindexNew->pprev->nChainTx) {
+    if (pindexNew->pprev == nullptr || pindexNew->pprev->nChainTx) {
         // If pindexNew is the genesis block or all parents are BLOCK_VALID_TRANSACTIONS.
         std::deque<CBlockIndex*> queue;
         queue.push_back(pindexNew);
@@ -2650,7 +2669,7 @@ static bool ReceivedBlockTransactions(const CBlock &block, CValidationState& sta
                 LOCK(cs_nBlockSequenceId);
                 pindex->nSequenceId = nBlockSequenceId++;
             }
-            if (chainActive.Tip() == NULL || !setBlockIndexCandidates.value_comp()(pindex, chainActive.Tip())) {
+            if (chainActive.Tip() == nullptr || !setBlockIndexCandidates.value_comp()(pindex, chainActive.Tip())) {
                 setBlockIndexCandidates.insert(pindex);
             }
             std::pair<std::multimap<CBlockIndex*, CBlockIndex*>::iterator, std::multimap<CBlockIndex*, CBlockIndex*>::iterator> range = mapBlocksUnlinked.equal_range(pindex);
@@ -2830,22 +2849,6 @@ bool CheckBlock(const CBlock& block, CValidationState& state, const Consensus::P
     return true;
 }
 
-static bool CheckIndexAgainstCheckpoint(const CBlockIndex* pindexPrev, CValidationState& state, const CChainParams& chainparams, const uint256& hash)
-{
-    if (*pindexPrev->phashBlock == chainparams.GetConsensus().hashGenesisBlock)
-        return true;
-
-    int nHeight = pindexPrev->nHeight+1;
-    // Don't accept any forks from the main chain prior to last checkpoint.
-    // GetLastCheckpoint finds the last checkpoint in MapCheckpoints that's in our
-    // MapBlockIndex.
-    CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(chainparams.Checkpoints());
-    if (pcheckpoint && nHeight < pcheckpoint->nHeight)
-        return state.DoS(100, error("%s: forked chain older than last checkpoint (height %d)", __func__, nHeight), REJECT_CHECKPOINT, "bad-fork-prior-to-checkpoint");
-
-    return true;
-}
-
 bool IsWitnessEnabled(const CBlockIndex* pindexPrev, const Consensus::Params& params)
 {
     return(1);
@@ -2889,7 +2892,7 @@ std::vector<unsigned char> GenerateCoinbaseCommitment(CBlock& block, const CBloc
     //if (consensusParams.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout != 0)
     {
         if (commitpos == -1) {
-            uint256 witnessroot = BlockWitnessMerkleRoot(block, NULL);
+            uint256 witnessroot = BlockWitnessMerkleRoot(block, nullptr);
             CHash256().Write(witnessroot.begin(), 32).Write(ret.data(), 32).Finalize(witnessroot.begin());
             CTxOut out;
             out.nValue = 0;
@@ -2914,14 +2917,26 @@ std::vector<unsigned char> GenerateCoinbaseCommitment(CBlock& block, const CBloc
 /** Context-dependent validity checks.
  *  By "context", we mean only the previous block headers, but not the UTXO
  *  set; UTXO-related validity checks are done in ConnectBlock(). */
-static bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& state, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev, int64_t nAdjustedTime)
+static bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& state, const CChainParams& params, const CBlockIndex* pindexPrev, int64_t nAdjustedTime)
 {
-    assert(pindexPrev != NULL);
+    assert(pindexPrev != nullptr);
     const int nHeight = pindexPrev->nHeight + 1;
+
     // Check proof of work
+    const Consensus::Params& consensusParams = params.GetConsensus();
     if (block.nBits != GetNextWorkRequired(pindexPrev, &block, consensusParams))
         return state.DoS(100, false, REJECT_INVALID, "bad-diffbits", false, "incorrect proof of work");
 
+    // Check against checkpoints
+    if (fCheckpointsEnabled) {
+        // Don't accept any forks from the main chain prior to last checkpoint.
+        // GetLastCheckpoint finds the last checkpoint in MapCheckpoints that's in our
+        // MapBlockIndex.
+        CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(params.Checkpoints());
+        if (pcheckpoint && nHeight < pcheckpoint->nHeight)
+            return state.DoS(100, error("%s: forked chain older than last checkpoint (height %d)", __func__, nHeight), REJECT_CHECKPOINT, "bad-fork-prior-to-checkpoint");
+    }
+
     // Check timestamp against prev
     if (block.GetBlockTime() <= pindexPrev->GetMedianTimePast())
         return state.Invalid(false, REJECT_INVALID, "time-too-old", "block's timestamp is too early");
@@ -2943,7 +2958,7 @@ static bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationSta
 
 static bool ContextualCheckBlock(const CBlock& block, CValidationState& state, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev)
 {
-    const int nHeight = pindexPrev == NULL ? 0 : pindexPrev->nHeight + 1;
+    const int nHeight = pindexPrev == nullptr ? 0 : pindexPrev->nHeight + 1;
 
     // Start enforcing BIP113 (Median Time Past) using versionbits logic.
     int nLockTimeFlags = 0;
@@ -3028,7 +3043,7 @@ static bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state
     // Check for duplicate
     uint256 hash = block.GetHash();
     BlockMap::iterator miSelf = mapBlockIndex.find(hash);
-    CBlockIndex *pindex = NULL;
+    CBlockIndex *pindex = nullptr;
     if (hash != chainparams.GetConsensus().hashGenesisBlock) {
 
         if (miSelf != mapBlockIndex.end()) {
@@ -3045,22 +3060,17 @@ static bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state
             return error("%s: Consensus::CheckBlockHeader: %s, %s", __func__, hash.ToString(), FormatStateMessage(state));
 
         // Get prev block index
-        CBlockIndex* pindexPrev = NULL;
+        CBlockIndex* pindexPrev = nullptr;
         BlockMap::iterator mi = mapBlockIndex.find(block.hashPrevBlock);
         if (mi == mapBlockIndex.end())
             return state.DoS(10, error("%s: prev block not found", __func__), 0, "prev-blk-not-found");
         pindexPrev = (*mi).second;
         if (pindexPrev->nStatus & BLOCK_FAILED_MASK)
             return state.DoS(100, error("%s: prev block invalid", __func__), REJECT_INVALID, "bad-prevblk");
-
-        assert(pindexPrev);
-        if (fCheckpointsEnabled && !CheckIndexAgainstCheckpoint(pindexPrev, state, chainparams, hash))
-            return error("%s: CheckIndexAgainstCheckpoint(): %s", __func__, state.GetRejectReason().c_str());
-
-        if (!ContextualCheckBlockHeader(block, state, chainparams.GetConsensus(), pindexPrev, GetAdjustedTime()))
+        if (!ContextualCheckBlockHeader(block, state, chainparams, pindexPrev, GetAdjustedTime()))
             return error("%s: Consensus::ContextualCheckBlockHeader: %s, %s", __func__, hash.ToString(), FormatStateMessage(state));
     }
-    if (pindex == NULL)
+    if (pindex == nullptr)
         pindex = AddToBlockIndex(block);
 
     if (ppindex)
@@ -3072,13 +3082,15 @@ static bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state
 }
 
 // Exposed wrapper for AcceptBlockHeader
-bool ProcessNewBlockHeaders(const std::vector<CBlockHeader>& headers, CValidationState& state, const CChainParams& chainparams, const CBlockIndex** ppindex)
+bool ProcessNewBlockHeaders(const std::vector<CBlockHeader>& headers, CValidationState& state, const CChainParams& chainparams, const CBlockIndex** ppindex, CBlockHeader *first_invalid)
 {
+    if (first_invalid != nullptr) first_invalid->SetNull();
     {
         LOCK(cs_main);
         for (const CBlockHeader& header : headers) {
-            CBlockIndex *pindex = NULL; // Use a temp pindex instead of ppindex to avoid a const_cast
+            CBlockIndex *pindex = nullptr; // Use a temp pindex instead of ppindex to avoid a const_cast
             if (!AcceptBlockHeader(header, state, chainparams, &pindex)) {
+                if (first_invalid) *first_invalid = header;
                 return false;
             }
             if (ppindex) {
@@ -3090,7 +3102,7 @@ bool ProcessNewBlockHeaders(const std::vector<CBlockHeader>& headers, CValidatio
     return true;
 }
 
-/** Store block on disk. If dbp is non-NULL, the file is known to already reside on disk */
+/** Store block on disk. If dbp is non-nullptr, the file is known to already reside on disk */
 static bool AcceptBlock(const std::shared_ptr<const CBlock>& pblock, CValidationState& state, const CChainParams& chainparams, CBlockIndex** ppindex, bool fRequested, const CDiskBlockPos* dbp, bool* fNewBlock)
 {
     const CBlock& block = *pblock;
@@ -3098,7 +3110,7 @@ static bool AcceptBlock(const std::shared_ptr<const CBlock>& pblock, CValidation
     if (fNewBlock) *fNewBlock = false;
     AssertLockHeld(cs_main);
 
-    CBlockIndex *pindexDummy = NULL;
+    CBlockIndex *pindexDummy = nullptr;
     CBlockIndex *&pindex = ppindex ? *ppindex : pindexDummy;
 
     if (!AcceptBlockHeader(block, state, chainparams, &pindex))
@@ -3128,6 +3140,12 @@ static bool AcceptBlock(const std::shared_ptr<const CBlock>& pblock, CValidation
         if (pindex->nTx != 0) return true;  // This is a previously-processed block that was pruned
         if (!fHasMoreWork) return true;     // Don't process less-work chains
         if (fTooFarAhead) return true;      // Block height is too high
+
+        // Protect against DoS attacks from low-work chains.
+        // If our tip is behind, a peer could try to send us
+        // low-work blocks on a fake chain that we would never
+        // request; don't process these.
+        if (pindex->nChainWork < nMinimumChainWork) return true;
     }
     if (fNewBlock) *fNewBlock = true;
 
@@ -3151,11 +3169,11 @@ static bool AcceptBlock(const std::shared_ptr<const CBlock>& pblock, CValidation
     try {
         unsigned int nBlockSize = ::GetSerializeSize(block, SER_DISK, CLIENT_VERSION);
         CDiskBlockPos blockPos;
-        if (dbp != NULL)
+        if (dbp != nullptr)
             blockPos = *dbp;
-        if (!FindBlockPos(state, blockPos, nBlockSize+8, nHeight, block.GetBlockTime(), dbp != NULL))
+        if (!FindBlockPos(state, blockPos, nBlockSize+8, nHeight, block.GetBlockTime(), dbp != nullptr))
             return error("AcceptBlock(): FindBlockPos failed");
-        if (dbp == NULL)
+        if (dbp == nullptr)
             if (!WriteBlockToDisk(block, blockPos, chainparams.MessageStart()))
                 AbortNode(state, "Failed to write block");
         if (!ReceivedBlockTransactions(block, state, pindex, blockPos, chainparams.GetConsensus()))
@@ -3173,7 +3191,7 @@ static bool AcceptBlock(const std::shared_ptr<const CBlock>& pblock, CValidation
 bool ProcessNewBlock(const CChainParams& chainparams, const std::shared_ptr<const CBlock> pblock, bool fForceProcessing, bool *fNewBlock)
 {
     {
-        CBlockIndex *pindex = NULL;
+        CBlockIndex *pindex = nullptr;
         if (fNewBlock) *fNewBlock = false;
         CValidationState state;
         // Ensure that CheckBlock() passes before calling AcceptBlock, as
@@ -3184,12 +3202,12 @@ bool ProcessNewBlock(const CChainParams& chainparams, const std::shared_ptr<cons
 
         if (ret) {
             // Store to disk
-            ret = AcceptBlock(pblock, state, chainparams, &pindex, fForceProcessing, NULL, fNewBlock);
+            ret = AcceptBlock(pblock, state, chainparams, &pindex, fForceProcessing, nullptr, fNewBlock);
         }
         CheckBlockIndex(chainparams.GetConsensus());
         if (!ret) {
             GetMainSignals().BlockChecked(*pblock, state);
-            return error("%s: AcceptBlock FAILED", __func__);
+            return error("%s: AcceptBlock FAILED (%s)", __func__, state.GetDebugMessage());
         }
     }
 
@@ -3206,16 +3224,13 @@ bool TestBlockValidity(CValidationState& state, const CChainParams& chainparams,
 {
     AssertLockHeld(cs_main);
     assert(pindexPrev && pindexPrev == chainActive.Tip());
-    if (fCheckpointsEnabled && !CheckIndexAgainstCheckpoint(pindexPrev, state, chainparams, block.GetHash()))
-        return error("%s: CheckIndexAgainstCheckpoint(): %s", __func__, state.GetRejectReason().c_str());
-
     CCoinsViewCache viewNew(pcoinsTip);
     CBlockIndex indexDummy(block);
     indexDummy.pprev = pindexPrev;
     indexDummy.nHeight = pindexPrev->nHeight + 1;
 
     // NOTE: CheckBlockHeader is called by CheckBlock
-    if (!ContextualCheckBlockHeader(block, state, chainparams.GetConsensus(), pindexPrev, GetAdjustedTime()))
+    if (!ContextualCheckBlockHeader(block, state, chainparams, pindexPrev, GetAdjustedTime()))
         return error("%s: Consensus::ContextualCheckBlockHeader: %s", __func__, FormatStateMessage(state));
     if (!CheckBlock(block, state, chainparams.GetConsensus(), fCheckPOW, fCheckMerkleRoot))
         return error("%s: Consensus::CheckBlock: %s", __func__, FormatStateMessage(state));
@@ -3233,8 +3248,10 @@ bool TestBlockValidity(CValidationState& state, const CChainParams& chainparams,
  */
 
 /* Calculate the amount of disk space the block & undo files currently use */
-static uint64_t CalculateCurrentUsage()
+uint64_t CalculateCurrentUsage()
 {
+    LOCK(cs_LastBlockFile);
+
     uint64_t retval = 0;
     for (const CBlockFileInfo &file : vinfoBlockFile) {
         retval += file.nSize + file.nUndoSize;
@@ -3245,6 +3262,8 @@ static uint64_t CalculateCurrentUsage()
 /* Prune a block file (modify associated database entries)*/
 void PruneOneBlockFile(const int fileNumber)
 {
+    LOCK(cs_LastBlockFile);
+
     for (BlockMap::iterator it = mapBlockIndex.begin(); it != mapBlockIndex.end(); ++it) {
         CBlockIndex* pindex = it->second;
         if (pindex->nFile == fileNumber) {
@@ -3291,7 +3310,7 @@ static void FindFilesToPruneManual(std::set<int>& setFilesToPrune, int nManualPr
     assert(fPruneMode && nManualPruneHeight > 0);
 
     LOCK2(cs_main, cs_LastBlockFile);
-    if (chainActive.Tip() == NULL)
+    if (chainActive.Tip() == nullptr)
         return;
 
     // last block to prune is the lesser of (user-specified height, MIN_BLOCKS_TO_KEEP from the tip)
@@ -3333,7 +3352,7 @@ void PruneBlockFilesManual(int nManualPruneHeight)
 static void FindFilesToPrune(std::set<int>& setFilesToPrune, uint64_t nPruneAfterHeight)
 {
     LOCK2(cs_main, cs_LastBlockFile);
-    if (chainActive.Tip() == NULL || nPruneTarget == 0) {
+    if (chainActive.Tip() == nullptr || nPruneTarget == 0) {
         return;
     }
     if ((uint64_t)chainActive.Tip()->nHeight <= nPruneAfterHeight) {
@@ -3391,7 +3410,7 @@ bool CheckDiskSpace(uint64_t nAdditionalBytes)
 static FILE* OpenDiskFile(const CDiskBlockPos &pos, const char *prefix, bool fReadOnly)
 {
     if (pos.IsNull())
-        return NULL;
+        return nullptr;
     fs::path path = GetBlockPosFilename(pos, prefix);
     fs::create_directories(path.parent_path());
     FILE* file = fsbridge::fopen(path, "rb+");
@@ -3399,13 +3418,13 @@ static FILE* OpenDiskFile(const CDiskBlockPos &pos, const char *prefix, bool fRe
         file = fsbridge::fopen(path, "wb+");
     if (!file) {
         LogPrintf("Unable to open file %s\n", path.string());
-        return NULL;
+        return nullptr;
     }
     if (pos.nPos) {
         if (fseek(file, pos.nPos, SEEK_SET)) {
             LogPrintf("Unable to seek to position %u of %s\n", pos.nPos, path.string());
             fclose(file);
-            return NULL;
+            return nullptr;
         }
     }
     return file;
@@ -3428,7 +3447,7 @@ fs::path GetBlockPosFilename(const CDiskBlockPos &pos, const char *prefix)
 CBlockIndex * InsertBlockIndex(uint256 hash)
 {
     if (hash.IsNull())
-        return NULL;
+        return nullptr;
 
     // Return existing
     BlockMap::iterator mi = mapBlockIndex.find(hash);
@@ -3437,8 +3456,6 @@ CBlockIndex * InsertBlockIndex(uint256 hash)
 
     // Create new
     CBlockIndex* pindexNew = new CBlockIndex();
-    if (!pindexNew)
-        throw std::runtime_error(std::string(__func__) + ": new CBlockIndex failed");
     mi = mapBlockIndex.insert(std::make_pair(hash, pindexNew)).first;
     pindexNew->phashBlock = &((*mi).first);
 
@@ -3480,13 +3497,13 @@ bool static LoadBlockIndexDB(const CChainParams& chainparams)
                 pindex->nChainTx = pindex->nTx;
             }
         }
-        if (pindex->IsValid(BLOCK_VALID_TRANSACTIONS) && (pindex->nChainTx || pindex->pprev == NULL))
+        if (pindex->IsValid(BLOCK_VALID_TRANSACTIONS) && (pindex->nChainTx || pindex->pprev == nullptr))
             setBlockIndexCandidates.insert(pindex);
         if (pindex->nStatus & BLOCK_FAILED_MASK && (!pindexBestInvalid || pindex->nChainWork > pindexBestInvalid->nChainWork))
             pindexBestInvalid = pindex;
         if (pindex->pprev)
             pindex->BuildSkip();
-        if (pindex->IsValid(BLOCK_VALID_TREE) && (pindexBestHeader == NULL || CBlockIndexWorkComparator()(pindexBestHeader, pindex)))
+        if (pindex->IsValid(BLOCK_VALID_TREE) && (pindexBestHeader == nullptr || CBlockIndexWorkComparator()(pindexBestHeader, pindex)))
             pindexBestHeader = pindex;
     }
 
@@ -3533,7 +3550,7 @@ bool static LoadBlockIndexDB(const CChainParams& chainparams)
     // Check whether we need to continue reindexing
     bool fReindexing = false;
     pblocktree->ReadReindexing(fReindexing);
-    fReindex |= fReindexing;
+    if(fReindexing) fReindex = true;
 
     // Check whether we have a transaction index
     pblocktree->ReadFlag("txindex", fTxIndex);
@@ -3573,18 +3590,18 @@ bool LoadChainTip(const CChainParams& chainparams)
 
 CVerifyDB::CVerifyDB()
 {
-    uiInterface.ShowProgress(_("Verifying blocks..."), 0);
+    uiInterface.ShowProgress(_("Verifying blocks..."), 0, false);
 }
 
 CVerifyDB::~CVerifyDB()
 {
-    uiInterface.ShowProgress("", 100);
+    uiInterface.ShowProgress("", 100, false);
 }
 
 bool CVerifyDB::VerifyDB(const CChainParams& chainparams, CCoinsView *coinsview, int nCheckLevel, int nCheckDepth)
 {
     LOCK(cs_main);
-    if (chainActive.Tip() == NULL || chainActive.Tip()->pprev == NULL)
+    if (chainActive.Tip() == nullptr || chainActive.Tip()->pprev == nullptr)
         return true;
 
     // Verify blocks in the best chain
@@ -3594,7 +3611,7 @@ bool CVerifyDB::VerifyDB(const CChainParams& chainparams, CCoinsView *coinsview,
     LogPrintf("Verifying last %i blocks at level %i\n", nCheckDepth, nCheckLevel);
     CCoinsViewCache coins(coinsview);
     CBlockIndex* pindexState = chainActive.Tip();
-    CBlockIndex* pindexFailure = NULL;
+    CBlockIndex* pindexFailure = nullptr;
     int nGoodTransactions = 0;
     CValidationState state;
     int reportDone = 0;
@@ -3608,7 +3625,7 @@ bool CVerifyDB::VerifyDB(const CChainParams& chainparams, CCoinsView *coinsview,
             LogPrintf("[%d%%]...", percentageDone);
             reportDone = percentageDone/10;
         }
-        uiInterface.ShowProgress(_("Verifying blocks..."), percentageDone);
+        uiInterface.ShowProgress(_("Verifying blocks..."), percentageDone, false);
         if (pindex->nHeight < chainActive.Height()-nCheckDepth)
             break;
         if (fPruneMode && !(pindex->nStatus & BLOCK_HAVE_DATA)) {
@@ -3659,7 +3676,7 @@ bool CVerifyDB::VerifyDB(const CChainParams& chainparams, CCoinsView *coinsview,
         CBlockIndex *pindex = pindexState;
         while (pindex != chainActive.Tip()) {
             boost::this_thread::interruption_point();
-            uiInterface.ShowProgress(_("Verifying blocks..."), std::max(1, std::min(99, 100 - (int)(((double)(chainActive.Height() - pindex->nHeight)) / (double)nCheckDepth * 50))));
+            uiInterface.ShowProgress(_("Verifying blocks..."), std::max(1, std::min(99, 100 - (int)(((double)(chainActive.Height() - pindex->nHeight)) / (double)nCheckDepth * 50))), false);
             pindex = chainActive.Next(pindex);
             CBlock block;
             if (!ReadBlockFromDisk(block, pindex, chainparams.GetConsensus()))
@@ -3706,7 +3723,7 @@ bool ReplayBlocks(const CChainParams& params, CCoinsView* view)
     if (hashHeads.empty()) return true; // We're already in a consistent state.
     if (hashHeads.size() != 2) return error("ReplayBlocks(): unknown inconsistent state");
 
-    uiInterface.ShowProgress(_("Replaying blocks..."), 0);
+    uiInterface.ShowProgress(_("Replaying blocks..."), 0, false);
     LogPrintf("Replaying blocks\n");
 
     const CBlockIndex* pindexOld = nullptr;  // Old tip during the interrupted flush.
@@ -3757,7 +3774,7 @@ bool ReplayBlocks(const CChainParams& params, CCoinsView* view)
 
     cache.SetBestBlock(pindexNew->GetBlockHash());
     cache.Flush();
-    uiInterface.ShowProgress("", 100);
+    uiInterface.ShowProgress("", 100, false);
     return true;
 }
 
@@ -3787,7 +3804,7 @@ bool RewindBlockIndex(const CChainParams& params)
             // of the blockchain).
             break;
         }
-        if (!DisconnectTip(state, params, NULL)) {
+        if (!DisconnectTip(state, params, nullptr)) {
             return error("RewindBlockIndex: unable to disconnect block at height %i", pindex->nHeight);
         }
         // Occasionally flush state to disk.
@@ -3836,7 +3853,7 @@ bool RewindBlockIndex(const CChainParams& params)
         }
     }
 
-    if (chainActive.Tip() != NULL) {
+    if (chainActive.Tip() != nullptr) {
         // We can't prune block index candidates based on our tip if we have
         // no tip due to chainActive being empty!
         PruneBlockIndexCandidates();
@@ -3861,9 +3878,9 @@ void UnloadBlockIndex()
 {
     LOCK(cs_main);
     setBlockIndexCandidates.clear();
-    chainActive.SetTip(NULL);
-    pindexBestInvalid = NULL;
-    pindexBestHeader = NULL;
+    chainActive.SetTip(nullptr);
+    pindexBestInvalid = nullptr;
+    pindexBestHeader = nullptr;
     mempool.clear();
     mapBlocksUnlinked.clear();
     vinfoBlockFile.clear();
@@ -3902,7 +3919,7 @@ bool LoadBlockIndex(const CChainParams& chainparams)
 
         LogPrintf("Initializing databases...\n");
         // Use the provided setting for -txindex in the new database
-        fTxIndex = GetBoolArg("-txindex", DEFAULT_TXINDEX);
+        fTxIndex = gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX);
         pblocktree->WriteFlag("txindex", fTxIndex);
     }
     return true;
@@ -3999,7 +4016,7 @@ bool LoadExternalBlockFile(const CChainParams& chainparams, FILE* fileIn, CDiskB
                 if (mapBlockIndex.count(hash) == 0 || (mapBlockIndex[hash]->nStatus & BLOCK_HAVE_DATA) == 0) {
                     LOCK(cs_main);
                     CValidationState state;
-                    if (AcceptBlock(pblock, state, chainparams, NULL, true, dbp, NULL))
+                    if (AcceptBlock(pblock, state, chainparams, nullptr, true, dbp, nullptr))
                         nLoaded++;
                     if (state.IsError())
                         break;
@@ -4033,7 +4050,7 @@ bool LoadExternalBlockFile(const CChainParams& chainparams, FILE* fileIn, CDiskB
                                     head.ToString());
                             LOCK(cs_main);
                             CValidationState dummy;
-                            if (AcceptBlock(pblockrecursive, dummy, chainparams, NULL, true, &it->second, NULL))
+                            if (AcceptBlock(pblockrecursive, dummy, chainparams, nullptr, true, &it->second, nullptr))
                             {
                                 nLoaded++;
                                 queue.push_back(pblockrecursive->GetHash());
@@ -4080,35 +4097,35 @@ void static CheckBlockIndex(const Consensus::Params& consensusParams)
 
     assert(forward.size() == mapBlockIndex.size());
 
-    std::pair<std::multimap<CBlockIndex*,CBlockIndex*>::iterator,std::multimap<CBlockIndex*,CBlockIndex*>::iterator> rangeGenesis = forward.equal_range(NULL);
+    std::pair<std::multimap<CBlockIndex*,CBlockIndex*>::iterator,std::multimap<CBlockIndex*,CBlockIndex*>::iterator> rangeGenesis = forward.equal_range(nullptr);
     CBlockIndex *pindex = rangeGenesis.first->second;
     rangeGenesis.first++;
-    assert(rangeGenesis.first == rangeGenesis.second); // There is only one index entry with parent NULL.
+    assert(rangeGenesis.first == rangeGenesis.second); // There is only one index entry with parent nullptr.
 
     // Iterate over the entire block tree, using depth-first search.
     // Along the way, remember whether there are blocks on the path from genesis
     // block being explored which are the first to have certain properties.
     size_t nNodes = 0;
     int nHeight = 0;
-    CBlockIndex* pindexFirstInvalid = NULL; // Oldest ancestor of pindex which is invalid.
-    CBlockIndex* pindexFirstMissing = NULL; // Oldest ancestor of pindex which does not have BLOCK_HAVE_DATA.
-    CBlockIndex* pindexFirstNeverProcessed = NULL; // Oldest ancestor of pindex for which nTx == 0.
-    CBlockIndex* pindexFirstNotTreeValid = NULL; // Oldest ancestor of pindex which does not have BLOCK_VALID_TREE (regardless of being valid or not).
-    CBlockIndex* pindexFirstNotTransactionsValid = NULL; // Oldest ancestor of pindex which does not have BLOCK_VALID_TRANSACTIONS (regardless of being valid or not).
-    CBlockIndex* pindexFirstNotChainValid = NULL; // Oldest ancestor of pindex which does not have BLOCK_VALID_CHAIN (regardless of being valid or not).
-    CBlockIndex* pindexFirstNotScriptsValid = NULL; // Oldest ancestor of pindex which does not have BLOCK_VALID_SCRIPTS (regardless of being valid or not).
-    while (pindex != NULL) {
+    CBlockIndex* pindexFirstInvalid = nullptr; // Oldest ancestor of pindex which is invalid.
+    CBlockIndex* pindexFirstMissing = nullptr; // Oldest ancestor of pindex which does not have BLOCK_HAVE_DATA.
+    CBlockIndex* pindexFirstNeverProcessed = nullptr; // Oldest ancestor of pindex for which nTx == 0.
+    CBlockIndex* pindexFirstNotTreeValid = nullptr; // Oldest ancestor of pindex which does not have BLOCK_VALID_TREE (regardless of being valid or not).
+    CBlockIndex* pindexFirstNotTransactionsValid = nullptr; // Oldest ancestor of pindex which does not have BLOCK_VALID_TRANSACTIONS (regardless of being valid or not).
+    CBlockIndex* pindexFirstNotChainValid = nullptr; // Oldest ancestor of pindex which does not have BLOCK_VALID_CHAIN (regardless of being valid or not).
+    CBlockIndex* pindexFirstNotScriptsValid = nullptr; // Oldest ancestor of pindex which does not have BLOCK_VALID_SCRIPTS (regardless of being valid or not).
+    while (pindex != nullptr) {
         nNodes++;
-        if (pindexFirstInvalid == NULL && pindex->nStatus & BLOCK_FAILED_VALID) pindexFirstInvalid = pindex;
-        if (pindexFirstMissing == NULL && !(pindex->nStatus & BLOCK_HAVE_DATA)) pindexFirstMissing = pindex;
-        if (pindexFirstNeverProcessed == NULL && pindex->nTx == 0) pindexFirstNeverProcessed = pindex;
-        if (pindex->pprev != NULL && pindexFirstNotTreeValid == NULL && (pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_TREE) pindexFirstNotTreeValid = pindex;
-        if (pindex->pprev != NULL && pindexFirstNotTransactionsValid == NULL && (pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_TRANSACTIONS) pindexFirstNotTransactionsValid = pindex;
-        if (pindex->pprev != NULL && pindexFirstNotChainValid == NULL && (pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_CHAIN) pindexFirstNotChainValid = pindex;
-        if (pindex->pprev != NULL && pindexFirstNotScriptsValid == NULL && (pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_SCRIPTS) pindexFirstNotScriptsValid = pindex;
+        if (pindexFirstInvalid == nullptr && pindex->nStatus & BLOCK_FAILED_VALID) pindexFirstInvalid = pindex;
+        if (pindexFirstMissing == nullptr && !(pindex->nStatus & BLOCK_HAVE_DATA)) pindexFirstMissing = pindex;
+        if (pindexFirstNeverProcessed == nullptr && pindex->nTx == 0) pindexFirstNeverProcessed = pindex;
+        if (pindex->pprev != nullptr && pindexFirstNotTreeValid == nullptr && (pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_TREE) pindexFirstNotTreeValid = pindex;
+        if (pindex->pprev != nullptr && pindexFirstNotTransactionsValid == nullptr && (pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_TRANSACTIONS) pindexFirstNotTransactionsValid = pindex;
+        if (pindex->pprev != nullptr && pindexFirstNotChainValid == nullptr && (pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_CHAIN) pindexFirstNotChainValid = pindex;
+        if (pindex->pprev != nullptr && pindexFirstNotScriptsValid == nullptr && (pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_SCRIPTS) pindexFirstNotScriptsValid = pindex;
 
         // Begin: actual consistency checks.
-        if (pindex->pprev == NULL) {
+        if (pindex->pprev == nullptr) {
             // Genesis block checks.
             assert(pindex->GetBlockHash() == consensusParams.hashGenesisBlock); // Genesis block's hash must match.
             assert(pindex == chainActive.Genesis()); // The current active chain's genesis block must be this block.
@@ -4127,26 +4144,26 @@ void static CheckBlockIndex(const Consensus::Params& consensusParams)
         if (pindex->nStatus & BLOCK_HAVE_UNDO) assert(pindex->nStatus & BLOCK_HAVE_DATA);
         assert(((pindex->nStatus & BLOCK_VALID_MASK) >= BLOCK_VALID_TRANSACTIONS) == (pindex->nTx > 0)); // This is pruning-independent.
         // All parents having had data (at some point) is equivalent to all parents being VALID_TRANSACTIONS, which is equivalent to nChainTx being set.
-        assert((pindexFirstNeverProcessed != NULL) == (pindex->nChainTx == 0)); // nChainTx != 0 is used to signal that all parent blocks have been processed (but may have been pruned).
-        assert((pindexFirstNotTransactionsValid != NULL) == (pindex->nChainTx == 0));
+        assert((pindexFirstNeverProcessed != nullptr) == (pindex->nChainTx == 0)); // nChainTx != 0 is used to signal that all parent blocks have been processed (but may have been pruned).
+        assert((pindexFirstNotTransactionsValid != nullptr) == (pindex->nChainTx == 0));
         assert(pindex->nHeight == nHeight); // nHeight must be consistent.
-        assert(pindex->pprev == NULL || pindex->nChainWork >= pindex->pprev->nChainWork); // For every block except the genesis block, the chainwork must be larger than the parent's.
+        assert(pindex->pprev == nullptr || pindex->nChainWork >= pindex->pprev->nChainWork); // For every block except the genesis block, the chainwork must be larger than the parent's.
         assert(nHeight < 2 || (pindex->pskip && (pindex->pskip->nHeight < nHeight))); // The pskip pointer must point back for all but the first 2 blocks.
-        assert(pindexFirstNotTreeValid == NULL); // All mapBlockIndex entries must at least be TREE valid
-        if ((pindex->nStatus & BLOCK_VALID_MASK) >= BLOCK_VALID_TREE) assert(pindexFirstNotTreeValid == NULL); // TREE valid implies all parents are TREE valid
-        if ((pindex->nStatus & BLOCK_VALID_MASK) >= BLOCK_VALID_CHAIN) assert(pindexFirstNotChainValid == NULL); // CHAIN valid implies all parents are CHAIN valid
-        if ((pindex->nStatus & BLOCK_VALID_MASK) >= BLOCK_VALID_SCRIPTS) assert(pindexFirstNotScriptsValid == NULL); // SCRIPTS valid implies all parents are SCRIPTS valid
-        if (pindexFirstInvalid == NULL) {
+        assert(pindexFirstNotTreeValid == nullptr); // All mapBlockIndex entries must at least be TREE valid
+        if ((pindex->nStatus & BLOCK_VALID_MASK) >= BLOCK_VALID_TREE) assert(pindexFirstNotTreeValid == nullptr); // TREE valid implies all parents are TREE valid
+        if ((pindex->nStatus & BLOCK_VALID_MASK) >= BLOCK_VALID_CHAIN) assert(pindexFirstNotChainValid == nullptr); // CHAIN valid implies all parents are CHAIN valid
+        if ((pindex->nStatus & BLOCK_VALID_MASK) >= BLOCK_VALID_SCRIPTS) assert(pindexFirstNotScriptsValid == nullptr); // SCRIPTS valid implies all parents are SCRIPTS valid
+        if (pindexFirstInvalid == nullptr) {
             // Checks for not-invalid blocks.
             assert((pindex->nStatus & BLOCK_FAILED_MASK) == 0); // The failed mask cannot be set for blocks without invalid parents.
         }
-        if (!CBlockIndexWorkComparator()(pindex, chainActive.Tip()) && pindexFirstNeverProcessed == NULL) {
-            if (pindexFirstInvalid == NULL) {
+        if (!CBlockIndexWorkComparator()(pindex, chainActive.Tip()) && pindexFirstNeverProcessed == nullptr) {
+            if (pindexFirstInvalid == nullptr) {
                 // If this block sorts at least as good as the current tip and
                 // is valid and we have all data for its parents, it must be in
                 // setBlockIndexCandidates.  chainActive.Tip() must also be there
                 // even if some data has been pruned.
-                if (pindexFirstMissing == NULL || pindex == chainActive.Tip()) {
+                if (pindexFirstMissing == nullptr || pindex == chainActive.Tip()) {
                     assert(setBlockIndexCandidates.count(pindex));
                 }
                 // If some parent is missing, then it could be that this block was in
@@ -4167,13 +4184,13 @@ void static CheckBlockIndex(const Consensus::Params& consensusParams)
             }
             rangeUnlinked.first++;
         }
-        if (pindex->pprev && (pindex->nStatus & BLOCK_HAVE_DATA) && pindexFirstNeverProcessed != NULL && pindexFirstInvalid == NULL) {
+        if (pindex->pprev && (pindex->nStatus & BLOCK_HAVE_DATA) && pindexFirstNeverProcessed != nullptr && pindexFirstInvalid == nullptr) {
             // If this block has block data available, some parent was never received, and has no invalid parents, it must be in mapBlocksUnlinked.
             assert(foundInUnlinked);
         }
         if (!(pindex->nStatus & BLOCK_HAVE_DATA)) assert(!foundInUnlinked); // Can't be in mapBlocksUnlinked if we don't HAVE_DATA
-        if (pindexFirstMissing == NULL) assert(!foundInUnlinked); // We aren't missing data for any parent -- cannot be in mapBlocksUnlinked.
-        if (pindex->pprev && (pindex->nStatus & BLOCK_HAVE_DATA) && pindexFirstNeverProcessed == NULL && pindexFirstMissing != NULL) {
+        if (pindexFirstMissing == nullptr) assert(!foundInUnlinked); // We aren't missing data for any parent -- cannot be in mapBlocksUnlinked.
+        if (pindex->pprev && (pindex->nStatus & BLOCK_HAVE_DATA) && pindexFirstNeverProcessed == nullptr && pindexFirstMissing != nullptr) {
             // We HAVE_DATA for this block, have received data for all parents at some point, but we're currently missing data for some parent.
             assert(fHavePruned); // We must have pruned.
             // This block may have entered mapBlocksUnlinked if:
@@ -4185,7 +4202,7 @@ void static CheckBlockIndex(const Consensus::Params& consensusParams)
             // So if this block is itself better than chainActive.Tip() and it wasn't in
             // setBlockIndexCandidates, then it must be in mapBlocksUnlinked.
             if (!CBlockIndexWorkComparator()(pindex, chainActive.Tip()) && setBlockIndexCandidates.count(pindex) == 0) {
-                if (pindexFirstInvalid == NULL) {
+                if (pindexFirstInvalid == nullptr) {
                     assert(foundInUnlinked);
                 }
             }
@@ -4206,13 +4223,13 @@ void static CheckBlockIndex(const Consensus::Params& consensusParams)
         while (pindex) {
             // We are going to either move to a parent or a sibling of pindex.
             // If pindex was the first with a certain property, unset the corresponding variable.
-            if (pindex == pindexFirstInvalid) pindexFirstInvalid = NULL;
-            if (pindex == pindexFirstMissing) pindexFirstMissing = NULL;
-            if (pindex == pindexFirstNeverProcessed) pindexFirstNeverProcessed = NULL;
-            if (pindex == pindexFirstNotTreeValid) pindexFirstNotTreeValid = NULL;
-            if (pindex == pindexFirstNotTransactionsValid) pindexFirstNotTransactionsValid = NULL;
-            if (pindex == pindexFirstNotChainValid) pindexFirstNotChainValid = NULL;
-            if (pindex == pindexFirstNotScriptsValid) pindexFirstNotScriptsValid = NULL;
+            if (pindex == pindexFirstInvalid) pindexFirstInvalid = nullptr;
+            if (pindex == pindexFirstMissing) pindexFirstMissing = nullptr;
+            if (pindex == pindexFirstNeverProcessed) pindexFirstNeverProcessed = nullptr;
+            if (pindex == pindexFirstNotTreeValid) pindexFirstNotTreeValid = nullptr;
+            if (pindex == pindexFirstNotTransactionsValid) pindexFirstNotTransactionsValid = nullptr;
+            if (pindex == pindexFirstNotChainValid) pindexFirstNotChainValid = nullptr;
+            if (pindex == pindexFirstNotScriptsValid) pindexFirstNotScriptsValid = nullptr;
             // Find our parent.
             CBlockIndex* pindexPar = pindex->pprev;
             // Find which child we just visited.
@@ -4247,6 +4264,8 @@ std::string CBlockFileInfo::ToString() const
 
 CBlockFileInfo* GetBlockFileInfo(size_t n)
 {
+    LOCK(cs_LastBlockFile);
+
     return &vinfoBlockFile.at(n);
 }
 
@@ -4273,7 +4292,7 @@ static const uint64_t MEMPOOL_DUMP_VERSION = 1;
 bool LoadMempool(void)
 {
     const CChainParams& chainparams = Params();
-    int64_t nExpiryTimeout = GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60;
+    int64_t nExpiryTimeout = gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60;
     FILE* filestr = fsbridge::fopen(GetDataDir() / "mempool.dat", "rb");
     CAutoFile file(filestr, SER_DISK, CLIENT_VERSION);
     if (file.IsNull()) {
@@ -4282,8 +4301,9 @@ bool LoadMempool(void)
     }
 
     int64_t count = 0;
-    int64_t skipped = 0;
+    int64_t expired = 0;
     int64_t failed = 0;
+    int64_t already_there = 0;
     int64_t nNow = GetTime();
 
     try {
@@ -4309,14 +4329,23 @@ bool LoadMempool(void)
             CValidationState state;
             if (nTime + nExpiryTimeout > nNow) {
                 LOCK(cs_main);
-                AcceptToMemoryPoolWithTime(chainparams, mempool, state, tx, true, NULL, nTime, NULL, false, 0);
+                AcceptToMemoryPoolWithTime(chainparams, mempool, state, tx, nullptr /* pfMissingInputs */, nTime,
+                                           nullptr /* plTxnReplaced */, false /* bypass_limits */, 0 /* nAbsurdFee */);
                 if (state.IsValid()) {
                     ++count;
                 } else {
-                    ++failed;
+                    // mempool may contain the transaction already, e.g. from
+                    // wallet(s) having loaded it while we were processing
+                    // mempool transactions; consider these as valid, instead of
+                    // failed, but mark them as 'already there'
+                    if (mempool.exists(tx->GetHash())) {
+                        ++already_there;
+                    } else {
+                        ++failed;
+                    }
                 }
             } else {
-                ++skipped;
+                ++expired;
             }
             if (ShutdownRequested())
                 return false;
@@ -4332,11 +4361,11 @@ bool LoadMempool(void)
         return false;
     }
 
-    LogPrintf("Imported mempool transactions from disk: %i successes, %i failed, %i expired\n", count, failed, skipped);
+    LogPrintf("Imported mempool transactions from disk: %i succeeded, %i failed, %i expired, %i already there\n", count, failed, expired, already_there);
     return true;
 }
 
-void DumpMempool(void)
+bool DumpMempool(void)
 {
     int64_t start = GetTimeMicros();
 
@@ -4356,7 +4385,7 @@ void DumpMempool(void)
     try {
         FILE* filestr = fsbridge::fopen(GetDataDir() / "mempool.dat.new", "wb");
         if (!filestr) {
-            return;
+            return false;
         }
 
         CAutoFile file(filestr, SER_DISK, CLIENT_VERSION);
@@ -4377,18 +4406,20 @@ void DumpMempool(void)
         file.fclose();
         RenameOver(GetDataDir() / "mempool.dat.new", GetDataDir() / "mempool.dat");
         int64_t last = GetTimeMicros();
-        LogPrintf("Dumped mempool: %gs to copy, %gs to dump\n", (mid-start)*0.000001, (last-mid)*0.000001);
+        LogPrintf("Dumped mempool: %gs to copy, %gs to dump\n", (mid-start)*MICRO, (last-mid)*MICRO);
     } catch (const std::exception& e) {
         LogPrintf("Failed to dump mempool: %s. Continuing anyway.\n", e.what());
+        return false;
     }
+    return true;
 }
 
 //! Guess how far we are in the verification process at the given block index
 double GuessVerificationProgress(const ChainTxData& data, CBlockIndex *pindex) {
-    if (pindex == NULL)
+    if (pindex == nullptr)
         return 0.0;
 
-    int64_t nNow = time(NULL);
+    int64_t nNow = time(nullptr);
 
     double fTxTotal;
 
diff --git a/src/validation.h b/src/validation.h
index 4407df032..93669de6c 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -45,9 +45,9 @@ struct ChainTxData;
 struct PrecomputedTransactionData;
 struct LockPoints;
 
-/** Default for DEFAULT_WHITELISTRELAY. */
+/** Default for -whitelistrelay. */
 static const bool DEFAULT_WHITELISTRELAY = true;
-/** Default for DEFAULT_WHITELISTFORCERELAY. */
+/** Default for -whitelistforcerelay. */
 static const bool DEFAULT_WHITELISTFORCERELAY = true;
 /** Default for -minrelaytxfee, minimum relay fee for transactions */
 static const unsigned int DEFAULT_MIN_RELAY_TX_FEE = 1000;
@@ -94,9 +94,9 @@ static const int MAX_CMPCTBLOCK_DEPTH = 5;
 static const int MAX_BLOCKTXN_DEPTH = 10;
 /** Size of the "block download window": how far ahead of our current height do we fetch?
  *  Larger windows tolerate larger download speed differences between peer, but increase the potential
- *  degree of disordering of blocks on disk (which make reindexing and in the future perhaps pruning
- *  harder). We'll probably want to make this a per-peer adaptive value at some point. */
-static const unsigned int BLOCK_DOWNLOAD_WINDOW = 128;//1024;
+ *  degree of disordering of blocks on disk (which make reindexing and pruning harder). We'll probably
+ *  want to make this a per-peer adaptive value at some point. */
+static const unsigned int BLOCK_DOWNLOAD_WINDOW = 1024;
 /** Time to wait (in seconds) between writing blocks/block index to disk. */
 static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60;
 /** Time to wait (in seconds) between flushing chainstate to disk. */
@@ -161,13 +161,12 @@ extern CTxMemPool mempool;
 typedef std::unordered_map<uint256, CBlockIndex*, BlockHasher> BlockMap;
 extern BlockMap mapBlockIndex;
 extern uint64_t nLastBlockTx;
-extern uint64_t nLastBlockSize;
 extern uint64_t nLastBlockWeight;
 extern const std::string strMessageMagic;
 extern CWaitableCriticalSection csBestBlock;
 extern CConditionVariable cvBlockChange;
 extern std::atomic_bool fImporting;
-extern bool fReindex;
+extern std::atomic_bool fReindex;
 extern int nScriptCheckThreads;
 extern bool fTxIndex;
 extern bool fIsBareMultisigStd;
@@ -186,6 +185,9 @@ extern bool fEnableReplacement;
 /** Block hash whose ancestors we will assume to have valid scripts without checking them. */
 extern uint256 hashAssumeValid;
 
+/** Minimum work we will assume exists on some valid chain. */
+extern arith_uint256 nMinimumChainWork;
+
 /** Best header we've seen so far (used for getheaders queries' starting points). */
 extern CBlockIndex *pindexBestHeader;
 
@@ -245,8 +247,9 @@ bool ProcessNewBlock(const CChainParams& chainparams, const std::shared_ptr<cons
  * @param[out] state This may be set to an Error state if any error occurred processing them
  * @param[in]  chainparams The params for the chain we want to connect to
  * @param[out] ppindex If set, the pointer will be set to point to the last new block index object for the given headers
+ * @param[out] first_invalid First header that fails validation, if one exists
  */
-bool ProcessNewBlockHeaders(const std::vector<CBlockHeader>& block, CValidationState& state, const CChainParams& chainparams, const CBlockIndex** ppindex=NULL);
+bool ProcessNewBlockHeaders(const std::vector<CBlockHeader>& block, CValidationState& state, const CChainParams& chainparams, const CBlockIndex** ppindex=nullptr, CBlockHeader *first_invalid=nullptr);
 
 /** Check whether enough disk space is available for an incoming block */
 bool CheckDiskSpace(uint64_t nAdditionalBytes = 0);
@@ -255,7 +258,7 @@ FILE* OpenBlockFile(const CDiskBlockPos &pos, bool fReadOnly = false);
 /** Translation to a filesystem path */
 fs::path GetBlockPosFilename(const CDiskBlockPos &pos, const char *prefix);
 /** Import blocks from an external file */
-bool LoadExternalBlockFile(const CChainParams& chainparams, FILE* fileIn, CDiskBlockPos *dbp = NULL);
+bool LoadExternalBlockFile(const CChainParams& chainparams, FILE* fileIn, CDiskBlockPos *dbp = nullptr);
 /** Ensures we have a genesis block in the block tree, possibly writing one to disk. */
 bool LoadGenesisBlock(const CChainParams& chainparams);
 /** Load the block tree and coins database from disk,
@@ -278,6 +281,9 @@ CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams);
 /** Guess verification progress (as a fraction between 0.0=genesis and 1.0=current tip). */
 double GuessVerificationProgress(const ChainTxData& data, CBlockIndex* pindex);
 
+/** Calculate the amount of disk space the block & undo files currently use */
+uint64_t CalculateCurrentUsage();
+
 /**
  *  Mark one block file as pruned.
  */
@@ -299,9 +305,9 @@ void PruneBlockFilesManual(int nManualPruneHeight);
 
 /** (try to) add transaction to memory pool
  * plTxnReplaced will be appended to with all transactions replaced from mempool **/
-bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree,
-                        bool* pfMissingInputs, std::list<CTransactionRef>* plTxnReplaced = NULL,
-                        bool fOverrideMempoolLimit=false, const CAmount nAbsurdFee=0);
+bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx,
+                        bool* pfMissingInputs, std::list<CTransactionRef>* plTxnReplaced,
+                        bool bypass_limits, const CAmount nAbsurdFee);
 
 /** Convert CValidationState to a human-readable message for logging */
 std::string FormatStateMessage(const CValidationState &state);
@@ -346,7 +352,7 @@ bool TestLockPointValidity(const LockPoints* lp);
  *
  * See consensus/consensus.h for flag definitions.
  */
-bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints* lp = NULL, bool useExistingLockPoints = false);
+bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints* lp = nullptr, bool useExistingLockPoints = false);
 
 /**
  * Closure representing one script verification
@@ -355,8 +361,7 @@ bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints* lp = NULL
 class CScriptCheck
 {
 private:
-    CScript scriptPubKey;
-    CAmount amount;
+    CTxOut m_tx_out;
     const CTransaction *ptxTo;
     unsigned int nIn;
     unsigned int nFlags;
@@ -365,17 +370,15 @@ class CScriptCheck
     PrecomputedTransactionData *txdata;
 
 public:
-    CScriptCheck(): amount(0), ptxTo(0), nIn(0), nFlags(0), cacheStore(false), error(SCRIPT_ERR_UNKNOWN_ERROR) {}
-    CScriptCheck(const CScript& scriptPubKeyIn, const CAmount amountIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, bool cacheIn, PrecomputedTransactionData* txdataIn) :
-        scriptPubKey(scriptPubKeyIn), amount(amountIn),
-        ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), error(SCRIPT_ERR_UNKNOWN_ERROR), txdata(txdataIn) { }
+    CScriptCheck(): ptxTo(nullptr), nIn(0), nFlags(0), cacheStore(false), error(SCRIPT_ERR_UNKNOWN_ERROR) {}
+    CScriptCheck(const CTxOut& outIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, bool cacheIn, PrecomputedTransactionData* txdataIn) :
+        m_tx_out(outIn), ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), error(SCRIPT_ERR_UNKNOWN_ERROR), txdata(txdataIn) { }
 
     bool operator()();
 
     void swap(CScriptCheck &check) {
-        scriptPubKey.swap(check.scriptPubKey);
         std::swap(ptxTo, check.ptxTo);
-        std::swap(amount, check.amount);
+        std::swap(m_tx_out, check.m_tx_out);
         std::swap(nIn, check.nIn);
         std::swap(nFlags, check.nFlags);
         std::swap(cacheStore, check.cacheStore);
@@ -475,7 +478,7 @@ static const unsigned int REJECT_HIGHFEE = 0x100;
 CBlockFileInfo* GetBlockFileInfo(size_t n);
 
 /** Dump the mempool to disk. */
-void DumpMempool();
+bool DumpMempool();
 
 /** Load the mempool from disk. */
 bool LoadMempool();
diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
index bf20d606f..281bc04b0 100644
--- a/src/validationinterface.cpp
+++ b/src/validationinterface.cpp
@@ -4,7 +4,9 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "validationinterface.h"
+
 #include "init.h"
+#include "primitives/block.h"
 #include "scheduler.h"
 #include "sync.h"
 #include "util.h"
@@ -30,7 +32,7 @@ struct MainSignalsInstance {
     // our own queue here :(
     SingleThreadedSchedulerClient m_schedulerClient;
 
-    MainSignalsInstance(CScheduler *pscheduler) : m_schedulerClient(pscheduler) {}
+    explicit MainSignalsInstance(CScheduler *pscheduler) : m_schedulerClient(pscheduler) {}
 };
 
 static CMainSignals g_signals;
diff --git a/src/versionbits.cpp b/src/versionbits.cpp
index 8047e17aa..64ae93967 100644
--- a/src/versionbits.cpp
+++ b/src/versionbits.cpp
@@ -28,14 +28,14 @@ ThresholdState AbstractThresholdConditionChecker::GetStateFor(const CBlockIndex*
     int64_t nTimeTimeout = EndTime(params);
 
     // A block's state is always the same as that of the first of its period, so it is computed based on a pindexPrev whose height equals a multiple of nPeriod - 1.
-    if (pindexPrev != NULL) {
+    if (pindexPrev != nullptr) {
         pindexPrev = pindexPrev->GetAncestor(pindexPrev->nHeight - ((pindexPrev->nHeight + 1) % nPeriod));
     }
 
     // Walk backwards in steps of nPeriod to find a pindexPrev whose information is known
     std::vector<const CBlockIndex*> vToCompute;
     while (cache.count(pindexPrev) == 0) {
-        if (pindexPrev == NULL) {
+        if (pindexPrev == nullptr) {
             // The genesis block is by definition defined.
             cache[pindexPrev] = THRESHOLD_DEFINED;
             break;
@@ -107,12 +107,12 @@ ThresholdState AbstractThresholdConditionChecker::GetStateFor(const CBlockIndex*
 // return the numerical statistics of blocks signalling the specified BIP9 condition in this current period
 BIP9Stats AbstractThresholdConditionChecker::GetStateStatisticsFor(const CBlockIndex* pindex, const Consensus::Params& params) const
 {
-    BIP9Stats stats;
+    BIP9Stats stats = {};
 
     stats.period = Period(params);
     stats.threshold = Threshold(params);
 
-    if (pindex == NULL)
+    if (pindex == nullptr)
         return stats;
 
     // Find beginning of period
@@ -150,12 +150,12 @@ int AbstractThresholdConditionChecker::GetStateSinceHeightFor(const CBlockIndex*
     // right now pindexPrev points to the block prior to the block that we are computing for, thus:
     // if we are computing for the last block of a period, then pindexPrev points to the second to last block of the period, and
     // if we are computing for the first block of a period, then pindexPrev points to the last block of the previous period.
-    // The parent of the genesis block is represented by NULL.
+    // The parent of the genesis block is represented by nullptr.
     pindexPrev = pindexPrev->GetAncestor(pindexPrev->nHeight - ((pindexPrev->nHeight + 1) % nPeriod));
 
     const CBlockIndex* previousPeriodParent = pindexPrev->GetAncestor(pindexPrev->nHeight - nPeriod);
 
-    while (previousPeriodParent != NULL && GetStateFor(previousPeriodParent, params, cache) == initialState) {
+    while (previousPeriodParent != nullptr && GetStateFor(previousPeriodParent, params, cache) == initialState) {
         pindexPrev = previousPeriodParent;
         previousPeriodParent = pindexPrev->GetAncestor(pindexPrev->nHeight - nPeriod);
     }
@@ -185,7 +185,7 @@ class VersionBitsConditionChecker : public AbstractThresholdConditionChecker {
     }
 
 public:
-    VersionBitsConditionChecker(Consensus::DeploymentPos id_) : id(id_) {}
+    explicit VersionBitsConditionChecker(Consensus::DeploymentPos id_) : id(id_) {}
     uint32_t Mask(const Consensus::Params& params) const { return ((uint32_t)1) << params.vDeployments[id].bit; }
 };
 
diff --git a/src/versionbits.h b/src/versionbits.h
index f4dfb7151..71dc0c850 100644
--- a/src/versionbits.h
+++ b/src/versionbits.h
@@ -27,7 +27,7 @@ enum ThresholdState {
 
 // A map that gives the state for blocks whose height is a multiple of Period().
 // The map is indexed by the block's parent, however, so all keys in the map
-// will either be NULL or a block with (height + 1) % Period() == 0.
+// will either be nullptr or a block with (height + 1) % Period() == 0.
 typedef std::map<const CBlockIndex*, ThresholdState> ThresholdConditionCache;
 
 struct VBDeploymentInfo {
diff --git a/src/wallet/crypter.cpp b/src/wallet/crypter.cpp
index dcce88ced..8db3bfd69 100644
--- a/src/wallet/crypter.cpp
+++ b/src/wallet/crypter.cpp
@@ -27,8 +27,7 @@ int CCrypter::BytesToKeySHA512AES(const std::vector<unsigned char>& chSalt, cons
     CSHA512 di;
 
     di.Write((const unsigned char*)strKeyData.c_str(), strKeyData.size());
-    if(chSalt.size())
-        di.Write(&chSalt[0], chSalt.size());
+    di.Write(chSalt.data(), chSalt.size());
     di.Finalize(buf);
 
     for(int i = 0; i != count - 1; i++)
@@ -82,7 +81,7 @@ bool CCrypter::Encrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned
     vchCiphertext.resize(vchPlaintext.size() + AES_BLOCKSIZE);
 
     AES256CBCEncrypt enc(vchKey.data(), vchIV.data(), true);
-    size_t nLen = enc.Encrypt(&vchPlaintext[0], vchPlaintext.size(), &vchCiphertext[0]);
+    size_t nLen = enc.Encrypt(&vchPlaintext[0], vchPlaintext.size(), vchCiphertext.data());
     if(nLen < vchPlaintext.size())
         return false;
     vchCiphertext.resize(nLen);
@@ -101,7 +100,7 @@ bool CCrypter::Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingM
     vchPlaintext.resize(nLen);
 
     AES256CBCDecrypt dec(vchKey.data(), vchIV.data(), true);
-    nLen = dec.Decrypt(&vchCiphertext[0], vchCiphertext.size(), &vchPlaintext[0]);
+    nLen = dec.Decrypt(vchCiphertext.data(), vchCiphertext.size(), &vchPlaintext[0]);
     if(nLen == 0)
         return false;
     vchPlaintext.resize(nLen);
@@ -113,7 +112,7 @@ static bool EncryptSecret(const CKeyingMaterial& vMasterKey, const CKeyingMateri
 {
     CCrypter cKeyCrypter;
     std::vector<unsigned char> chIV(WALLET_CRYPTO_IV_SIZE);
-    memcpy(&chIV[0], &nIV, WALLET_CRYPTO_IV_SIZE);
+    memcpy(chIV.data(), &nIV, WALLET_CRYPTO_IV_SIZE);
     if(!cKeyCrypter.SetKey(vMasterKey, chIV))
         return false;
     return cKeyCrypter.Encrypt(*((const CKeyingMaterial*)&vchPlaintext), vchCiphertext);
@@ -123,7 +122,7 @@ static bool DecryptSecret(const CKeyingMaterial& vMasterKey, const std::vector<u
 {
     CCrypter cKeyCrypter;
     std::vector<unsigned char> chIV(WALLET_CRYPTO_IV_SIZE);
-    memcpy(&chIV[0], &nIV, WALLET_CRYPTO_IV_SIZE);
+    memcpy(chIV.data(), &nIV, WALLET_CRYPTO_IV_SIZE);
     if(!cKeyCrypter.SetKey(vMasterKey, chIV))
         return false;
     return cKeyCrypter.Decrypt(vchCiphertext, *((CKeyingMaterial*)&vchPlaintext));
diff --git a/src/wallet/crypter.h b/src/wallet/crypter.h
index 1dc44e424..1416ae7d0 100644
--- a/src/wallet/crypter.h
+++ b/src/wallet/crypter.h
@@ -9,6 +9,8 @@
 #include "serialize.h"
 #include "support/allocators/secure.h"
 
+#include <atomic>
+
 const unsigned int WALLET_CRYPTO_KEY_SIZE = 32;
 const unsigned int WALLET_CRYPTO_SALT_SIZE = 8;
 const unsigned int WALLET_CRYPTO_IV_SIZE = 16;
@@ -16,13 +18,13 @@ const unsigned int WALLET_CRYPTO_IV_SIZE = 16;
 /**
  * Private key encryption is done based on a CMasterKey,
  * which holds a salt and random encryption key.
- * 
+ *
  * CMasterKeys are encrypted using AES-256-CBC using a key
  * derived using derivation method nDerivationMethod
  * (0 == EVP_sha512()) and derivation iterations nDeriveIterations.
  * vchOtherDerivationParameters is provided for alternative algorithms
  * which may require more parameters (such as scrypt).
- * 
+ *
  * Wallet Private Keys are then encrypted using AES-256-CBC
  * with the double-sha256 of the public key as the IV, and the
  * master key's key as the encryption key (see keystore.[ch]).
@@ -113,13 +115,12 @@ friend class wallet_crypto::TestCrypter; // for test access to chKey/chIV
 class CCryptoKeyStore : public CBasicKeyStore
 {
 private:
-    CryptedKeyMap mapCryptedKeys;
 
     CKeyingMaterial vMasterKey;
 
     //! if fUseCrypto is true, mapKeys must be empty
     //! if fUseCrypto is false, vMasterKey must be empty
-    bool fUseCrypto;
+    std::atomic<bool> fUseCrypto;
 
     //! keeps track of whether Unlock has run a thorough check before
     bool fDecryptionThoroughlyChecked;
@@ -131,6 +132,7 @@ class CCryptoKeyStore : public CBasicKeyStore
     bool EncryptKeys(CKeyingMaterial& vMasterKeyIn);
 
     bool Unlock(const CKeyingMaterial& vMasterKeyIn);
+    CryptedKeyMap mapCryptedKeys;
 
 public:
     CCryptoKeyStore() : fUseCrypto(false), fDecryptionThoroughlyChecked(false)
@@ -162,28 +164,26 @@ class CCryptoKeyStore : public CBasicKeyStore
     {
         {
             LOCK(cs_KeyStore);
-            if (!IsCrypted())
+            if (!IsCrypted()) {
                 return CBasicKeyStore::HaveKey(address);
+            }
             return mapCryptedKeys.count(address) > 0;
         }
         return false;
     }
     bool GetKey(const CKeyID &address, CKey& keyOut) const override;
     bool GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const override;
-    void GetKeys(std::set<CKeyID> &setAddress) const override
+    std::set<CKeyID> GetKeys() const override
     {
-        if (!IsCrypted())
-        {
-            CBasicKeyStore::GetKeys(setAddress);
-            return;
+        LOCK(cs_KeyStore);
+        if (!IsCrypted()) {
+            return CBasicKeyStore::GetKeys();
         }
-        setAddress.clear();
-        CryptedKeyMap::const_iterator mi = mapCryptedKeys.begin();
-        while (mi != mapCryptedKeys.end())
-        {
-            setAddress.insert((*mi).first);
-            mi++;
+        std::set<CKeyID> set_address;
+        for (const auto& mi : mapCryptedKeys) {
+            set_address.insert(mi.first);
         }
+        return set_address;
     }
 
     /**
diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
index da2d18075..459d289a4 100644
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -20,6 +20,40 @@
 
 #include <boost/thread.hpp>
 
+namespace {
+//! Make sure database has a unique fileid within the environment. If it
+//! doesn't, throw an error. BDB caches do not work properly when more than one
+//! open database has the same fileid (values written to one database may show
+//! up in reads to other databases).
+//!
+//! BerkeleyDB generates unique fileids by default
+//! (https://docs.oracle.com/cd/E17275_01/html/programmer_reference/program_copy.html),
+//! so bitcoin should never create different databases with the same fileid, but
+//! this error can be triggered if users manually copy database files.
+void CheckUniqueFileid(const CDBEnv& env, const std::string& filename, Db& db)
+{
+    if (env.IsMock()) return;
+
+    u_int8_t fileid[DB_FILE_ID_LEN];
+    int ret = db.get_mpf()->get_fileid(fileid);
+    if (ret != 0) {
+        throw std::runtime_error(strprintf("CDB: Can't open database %s (get_fileid failed with %d)", filename, ret));
+    }
+
+    for (const auto& item : env.mapDb) {
+        u_int8_t item_fileid[DB_FILE_ID_LEN];
+        if (item.second && item.second->get_mpf()->get_fileid(item_fileid) == 0 &&
+            memcmp(fileid, item_fileid, sizeof(fileid)) == 0) {
+            const char* item_filename = nullptr;
+            item.second->get_dbname(&item_filename, nullptr);
+            throw std::runtime_error(strprintf("CDB: Can't open database %s (duplicates fileid %s from %s)", filename,
+                HexStr(std::begin(item_fileid), std::end(item_fileid)),
+                item_filename ? item_filename : "(unknown database)"));
+        }
+    }
+}
+} // namespace
+
 //
 // CDB
 //
@@ -47,7 +81,7 @@ void CDBEnv::Reset()
     fMockDb = false;
 }
 
-CDBEnv::CDBEnv() : dbenv(NULL)
+CDBEnv::CDBEnv() : dbenv(nullptr)
 {
     Reset();
 }
@@ -56,7 +90,7 @@ CDBEnv::~CDBEnv()
 {
     EnvShutdown();
     delete dbenv;
-    dbenv = NULL;
+    dbenv = nullptr;
 }
 
 void CDBEnv::Close()
@@ -78,7 +112,7 @@ bool CDBEnv::Open(const fs::path& pathIn)
     LogPrintf("CDBEnv::Open: LogDir=%s ErrorFile=%s\n", pathLogDir.string(), pathErrorFile.string());
 
     unsigned int nEnvFlags = 0;
-    if (GetBoolArg("-privdb", DEFAULT_WALLET_PRIVDB))
+    if (gArgs.GetBoolArg("-privdb", DEFAULT_WALLET_PRIVDB))
         nEnvFlags |= DB_PRIVATE;
 
     dbenv->set_lg_dir(pathLogDir.string().c_str());
@@ -101,8 +135,10 @@ bool CDBEnv::Open(const fs::path& pathIn)
                              DB_RECOVER |
                              nEnvFlags,
                          S_IRUSR | S_IWUSR);
-    if (ret != 0)
+    if (ret != 0) {
+        dbenv->close(0);
         return error("CDBEnv::Open: Error %d opening database environment: %s\n", ret, DbEnv::strerror(ret));
+    }
 
     fDbEnvInit = true;
     fMockDb = false;
@@ -125,7 +161,7 @@ void CDBEnv::MakeMock()
     dbenv->set_lk_max_objects(10000);
     dbenv->set_flags(DB_AUTO_COMMIT, 1);
     dbenv->log_set_config(DB_LOG_IN_MEMORY, 1);
-    int ret = dbenv->open(NULL,
+    int ret = dbenv->open(nullptr,
                          DB_CREATE |
                              DB_INIT_LOCK |
                              DB_INIT_LOG |
@@ -147,10 +183,10 @@ CDBEnv::VerifyResult CDBEnv::Verify(const std::string& strFile, recoverFunc_type
     assert(mapFileUseCount.count(strFile) == 0);
 
     Db db(dbenv, 0);
-    int result = db.verify(strFile.c_str(), NULL, NULL, 0);
+    int result = db.verify(strFile.c_str(), nullptr, nullptr, 0);
     if (result == 0)
         return VERIFY_OK;
-    else if (recoverFunc == NULL)
+    else if (recoverFunc == nullptr)
         return RECOVER_FAIL;
 
     // Try to recover:
@@ -170,7 +206,7 @@ bool CDB::Recover(const std::string& filename, void *callbackDataIn, bool (*reco
     int64_t now = GetTime();
     newFilename = strprintf("%s.%d.bak", filename, now);
 
-    int result = bitdb.dbenv->dbrename(NULL, filename.c_str(), NULL,
+    int result = bitdb.dbenv->dbrename(nullptr, filename.c_str(), nullptr,
                                        newFilename.c_str(), DB_AUTO_COMMIT);
     if (result == 0)
         LogPrintf("Renamed %s to %s\n", filename, newFilename);
@@ -190,15 +226,15 @@ bool CDB::Recover(const std::string& filename, void *callbackDataIn, bool (*reco
     LogPrintf("Salvage(aggressive) found %u records\n", salvagedData.size());
 
     std::unique_ptr<Db> pdbCopy(new Db(bitdb.dbenv, 0));
-    int ret = pdbCopy->open(NULL,               // Txn pointer
+    int ret = pdbCopy->open(nullptr,               // Txn pointer
                             filename.c_str(),   // Filename
                             "main",             // Logical db name
                             DB_BTREE,           // Database type
                             DB_CREATE,          // Flags
                             0);
-    if (ret > 0)
-    {
+    if (ret > 0) {
         LogPrintf("Cannot create database file %s\n", filename);
+        pdbCopy->close(0);
         return false;
     }
 
@@ -299,7 +335,7 @@ bool CDBEnv::Salvage(const std::string& strFile, bool fAggressive, std::vector<C
     std::stringstream strDump;
 
     Db db(dbenv, 0);
-    int result = db.verify(strFile.c_str(), NULL, &strDump, flags);
+    int result = db.verify(strFile.c_str(), nullptr, &strDump, flags);
     if (result == DB_VERIFY_BAD) {
         LogPrintf("CDBEnv::Salvage: Database salvage found errors, all data may not be recoverable.\n");
         if (!fAggressive) {
@@ -357,7 +393,7 @@ void CDBEnv::CheckpointLSN(const std::string& strFile)
 }
 
 
-CDB::CDB(CWalletDBWrapper& dbw, const char* pszMode, bool fFlushOnCloseIn) : pdb(NULL), activeTxn(NULL)
+CDB::CDB(CWalletDBWrapper& dbw, const char* pszMode, bool fFlushOnCloseIn) : pdb(nullptr), activeTxn(nullptr)
 {
     fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
     fFlushOnClose = fFlushOnCloseIn;
@@ -367,7 +403,7 @@ CDB::CDB(CWalletDBWrapper& dbw, const char* pszMode, bool fFlushOnCloseIn) : pdb
     }
     const std::string &strFilename = dbw.strFile;
 
-    bool fCreate = strchr(pszMode, 'c') != NULL;
+    bool fCreate = strchr(pszMode, 'c') != nullptr;
     unsigned int nFlags = DB_THREAD;
     if (fCreate)
         nFlags |= DB_CREATE;
@@ -377,35 +413,34 @@ CDB::CDB(CWalletDBWrapper& dbw, const char* pszMode, bool fFlushOnCloseIn) : pdb
         if (!env->Open(GetDataDir()))
             throw std::runtime_error("CDB: Failed to open database environment.");
 
-        strFile = strFilename;
-        ++env->mapFileUseCount[strFile];
-        pdb = env->mapDb[strFile];
-        if (pdb == NULL) {
+        pdb = env->mapDb[strFilename];
+        if (pdb == nullptr) {
             int ret;
-            pdb = new Db(env->dbenv, 0);
+            std::unique_ptr<Db> pdb_temp(new Db(env->dbenv, 0));
 
             bool fMockDb = env->IsMock();
             if (fMockDb) {
-                DbMpoolFile* mpf = pdb->get_mpf();
+                DbMpoolFile* mpf = pdb_temp->get_mpf();
                 ret = mpf->set_flags(DB_MPOOL_NOFILE, 1);
-                if (ret != 0)
-                    throw std::runtime_error(strprintf("CDB: Failed to configure for no temp file backing for database %s", strFile));
+                if (ret != 0) {
+                    throw std::runtime_error(strprintf("CDB: Failed to configure for no temp file backing for database %s", strFilename));
+                }
             }
 
-            ret = pdb->open(NULL,                               // Txn pointer
-                            fMockDb ? NULL : strFile.c_str(),   // Filename
-                            fMockDb ? strFile.c_str() : "main", // Logical db name
-                            DB_BTREE,                           // Database type
-                            nFlags,                             // Flags
+            ret = pdb_temp->open(nullptr,                             // Txn pointer
+                            fMockDb ? nullptr : strFilename.c_str(),  // Filename
+                            fMockDb ? strFilename.c_str() : "main",   // Logical db name
+                            DB_BTREE,                                 // Database type
+                            nFlags,                                   // Flags
                             0);
 
             if (ret != 0) {
-                delete pdb;
-                pdb = NULL;
-                --env->mapFileUseCount[strFile];
-                strFile = "";
                 throw std::runtime_error(strprintf("CDB: Error %d, can't open database %s", ret, strFilename));
             }
+            CheckUniqueFileid(*env, strFilename, *pdb_temp);
+
+            pdb = pdb_temp.release();
+            env->mapDb[strFilename] = pdb;
 
             if (fCreate && !Exists(std::string("version"))) {
                 bool fTmp = fReadOnly;
@@ -413,9 +448,9 @@ CDB::CDB(CWalletDBWrapper& dbw, const char* pszMode, bool fFlushOnCloseIn) : pdb
                 WriteVersion(CLIENT_VERSION);
                 fReadOnly = fTmp;
             }
-
-            env->mapDb[strFile] = pdb;
         }
+        ++env->mapFileUseCount[strFilename];
+        strFile = strFilename;
     }
 }
 
@@ -429,7 +464,7 @@ void CDB::Flush()
     if (fReadOnly)
         nMinutes = 1;
 
-    env->dbenv->txn_checkpoint(nMinutes ? GetArg("-dblogsize", DEFAULT_WALLET_DBLOGSIZE) * 1024 : 0, nMinutes, 0);
+    env->dbenv->txn_checkpoint(nMinutes ? gArgs.GetArg("-dblogsize", DEFAULT_WALLET_DBLOGSIZE) * 1024 : 0, nMinutes, 0);
 }
 
 void CWalletDBWrapper::IncrementUpdateCounter()
@@ -443,8 +478,8 @@ void CDB::Close()
         return;
     if (activeTxn)
         activeTxn->abort();
-    activeTxn = NULL;
-    pdb = NULL;
+    activeTxn = nullptr;
+    pdb = nullptr;
 
     if (fFlushOnClose)
         Flush();
@@ -459,12 +494,12 @@ void CDBEnv::CloseDb(const std::string& strFile)
 {
     {
         LOCK(cs_db);
-        if (mapDb[strFile] != NULL) {
+        if (mapDb[strFile] != nullptr) {
             // Close the database handle
             Db* pdb = mapDb[strFile];
             pdb->close(0);
             delete pdb;
-            mapDb[strFile] = NULL;
+            mapDb[strFile] = nullptr;
         }
     }
 }
@@ -492,7 +527,7 @@ bool CDB::Rewrite(CWalletDBWrapper& dbw, const char* pszSkip)
                     CDB db(dbw, "r");
                     Db* pdbCopy = new Db(env->dbenv, 0);
 
-                    int ret = pdbCopy->open(NULL,               // Txn pointer
+                    int ret = pdbCopy->open(nullptr,               // Txn pointer
                                             strFileRes.c_str(), // Filename
                                             "main",             // Logical db name
                                             DB_BTREE,           // Database type
@@ -527,7 +562,7 @@ bool CDB::Rewrite(CWalletDBWrapper& dbw, const char* pszSkip)
                             }
                             Dbt datKey(ssKey.data(), ssKey.size());
                             Dbt datValue(ssValue.data(), ssValue.size());
-                            int ret2 = pdbCopy->put(NULL, &datKey, &datValue, DB_NOOVERWRITE);
+                            int ret2 = pdbCopy->put(nullptr, &datKey, &datValue, DB_NOOVERWRITE);
                             if (ret2 > 0)
                                 fSuccess = false;
                         }
@@ -536,15 +571,17 @@ bool CDB::Rewrite(CWalletDBWrapper& dbw, const char* pszSkip)
                         env->CloseDb(strFile);
                         if (pdbCopy->close(0))
                             fSuccess = false;
-                        delete pdbCopy;
+                    } else {
+                        pdbCopy->close(0);
                     }
+                    delete pdbCopy;
                 }
                 if (fSuccess) {
                     Db dbA(env->dbenv, 0);
-                    if (dbA.remove(strFile.c_str(), NULL, 0))
+                    if (dbA.remove(strFile.c_str(), nullptr, 0))
                         fSuccess = false;
                     Db dbB(env->dbenv, 0);
-                    if (dbB.rename(strFileRes.c_str(), NULL, strFile.c_str(), 0))
+                    if (dbB.rename(strFileRes.c_str(), nullptr, strFile.c_str(), 0))
                         fSuccess = false;
                 }
                 if (!fSuccess)
@@ -554,7 +591,6 @@ bool CDB::Rewrite(CWalletDBWrapper& dbw, const char* pszSkip)
         }
         MilliSleep(100);
     }
-    return false;
 }
 
 
@@ -680,7 +716,6 @@ bool CWalletDBWrapper::Backup(const std::string& strDest)
         }
         MilliSleep(100);
     }
-    return false;
 }
 
 void CWalletDBWrapper::Flush(bool shutdown)
diff --git a/src/wallet/db.h b/src/wallet/db.h
index 4f3ad0c42..14283ac8f 100644
--- a/src/wallet/db.h
+++ b/src/wallet/db.h
@@ -45,7 +45,7 @@ class CDBEnv
     void Reset();
 
     void MakeMock();
-    bool IsMock() { return fMockDb; }
+    bool IsMock() const { return fMockDb; }
 
     /**
      * Verify that database file strFile is OK. If it is not,
@@ -77,10 +77,10 @@ class CDBEnv
 
     DbTxn* TxnBegin(int flags = DB_TXN_WRITE_NOSYNC)
     {
-        DbTxn* ptxn = NULL;
-        int ret = dbenv->txn_begin(NULL, &ptxn, flags);
+        DbTxn* ptxn = nullptr;
+        int ret = dbenv->txn_begin(nullptr, &ptxn, flags);
         if (!ptxn || ret != 0)
-            return NULL;
+            return nullptr;
         return ptxn;
     }
 };
@@ -156,6 +156,9 @@ class CDB
     explicit CDB(CWalletDBWrapper& dbw, const char* pszMode = "r+", bool fFlushOnCloseIn=true);
     ~CDB() { Close(); }
 
+    CDB(const CDB&) = delete;
+    CDB& operator=(const CDB&) = delete;
+
     void Flush();
     void Close();
     static bool Recover(const std::string& filename, void *callbackDataIn, bool (*recoverKVcallback)(void* callbackData, CDataStream ssKey, CDataStream ssValue), std::string& out_backup_filename);
@@ -168,10 +171,6 @@ class CDB
     /* verifies the database file */
     static bool VerifyDatabaseFile(const std::string& walletFile, const fs::path& dataDir, std::string& warningStr, std::string& errorStr, CDBEnv::recoverFunc_type recoverFunc);
 
-private:
-    CDB(const CDB&);
-    void operator=(const CDB&);
-
 public:
     template <typename K, typename T>
     bool Read(const K& key, T& value)
@@ -191,7 +190,7 @@ class CDB
         int ret = pdb->get(activeTxn, &datKey, &datValue, 0);
         memory_cleanse(datKey.get_data(), datKey.get_size());
         bool success = false;
-        if (datValue.get_data() != NULL) {
+        if (datValue.get_data() != nullptr) {
             // Unserialize value
             try {
                 CDataStream ssValue((char*)datValue.get_data(), (char*)datValue.get_data() + datValue.get_size(), SER_DISK, CLIENT_VERSION);
@@ -282,11 +281,11 @@ class CDB
     Dbc* GetCursor()
     {
         if (!pdb)
-            return NULL;
-        Dbc* pcursor = NULL;
-        int ret = pdb->cursor(NULL, &pcursor, 0);
+            return nullptr;
+        Dbc* pcursor = nullptr;
+        int ret = pdb->cursor(nullptr, &pcursor, 0);
         if (ret != 0)
-            return NULL;
+            return nullptr;
         return pcursor;
     }
 
@@ -306,7 +305,7 @@ class CDB
         int ret = pcursor->get(&datKey, &datValue, fFlags);
         if (ret != 0)
             return ret;
-        else if (datKey.get_data() == NULL || datValue.get_data() == NULL)
+        else if (datKey.get_data() == nullptr || datValue.get_data() == nullptr)
             return 99999;
 
         // Convert to streams
@@ -342,7 +341,7 @@ class CDB
         if (!pdb || !activeTxn)
             return false;
         int ret = activeTxn->commit(0);
-        activeTxn = NULL;
+        activeTxn = nullptr;
         return (ret == 0);
     }
 
@@ -351,7 +350,7 @@ class CDB
         if (!pdb || !activeTxn)
             return false;
         int ret = activeTxn->abort();
-        activeTxn = NULL;
+        activeTxn = nullptr;
         return (ret == 0);
     }
 
@@ -366,7 +365,7 @@ class CDB
         return Write(std::string("version"), nVersion);
     }
 
-    bool static Rewrite(CWalletDBWrapper& dbw, const char* pszSkip = NULL);
+    bool static Rewrite(CWalletDBWrapper& dbw, const char* pszSkip = nullptr);
 };
 
 #endif // BITCOIN_WALLET_DB_H
diff --git a/src/wallet/feebumper.cpp b/src/wallet/feebumper.cpp
index 4bfd8726a..6abd06071 100644
--- a/src/wallet/feebumper.cpp
+++ b/src/wallet/feebumper.cpp
@@ -5,6 +5,7 @@
 #include "consensus/validation.h"
 #include "wallet/coincontrol.h"
 #include "wallet/feebumper.h"
+#include "wallet/fees.h"
 #include "wallet/wallet.h"
 #include "policy/fees.h"
 #include "policy/policy.h"
@@ -76,12 +77,12 @@ CFeeBumper::CFeeBumper(const CWallet *pWallet, const uint256 txidIn, const CCoin
     vErrors.clear();
     bumpedTxid.SetNull();
     AssertLockHeld(pWallet->cs_wallet);
-    if (!pWallet->mapWallet.count(txid)) {
+    auto it = pWallet->mapWallet.find(txid);
+    if (it == pWallet->mapWallet.end()) {
         vErrors.push_back("Invalid or non-wallet transaction id");
         currentResult = BumpFeeResult::INVALID_ADDRESS_OR_KEY;
         return;
     }
-    auto it = pWallet->mapWallet.find(txid);
     const CWalletTx& wtx = it->second;
 
     if (!preconditionChecks(pWallet, wtx)) {
@@ -156,7 +157,7 @@ CFeeBumper::CFeeBumper(const CWallet *pWallet, const uint256 txidIn, const CCoin
             currentResult = BumpFeeResult::INVALID_PARAMETER;
             return;
         }
-        CAmount requiredFee = CWallet::GetRequiredFee(maxNewTxSize);
+        CAmount requiredFee = GetRequiredFee(maxNewTxSize);
         if (totalFee < requiredFee) {
             vErrors.push_back(strprintf("Insufficient totalFee (cannot be less than required fee %s)",
                                                                 FormatMoney(requiredFee)));
@@ -166,7 +167,7 @@ CFeeBumper::CFeeBumper(const CWallet *pWallet, const uint256 txidIn, const CCoin
         nNewFee = totalFee;
         nNewFeeRate = CFeeRate(totalFee, maxNewTxSize);
     } else {
-        nNewFee = CWallet::GetMinimumFee(maxNewTxSize, coin_control, mempool, ::feeEstimator, nullptr /* FeeCalculation */);
+        nNewFee = GetMinimumFee(maxNewTxSize, coin_control, mempool, ::feeEstimator, nullptr /* FeeCalculation */);
         nNewFeeRate = CFeeRate(nNewFee, maxNewTxSize);
 
         // New fee rate must be at least old rate + minimum incremental relay rate
@@ -193,7 +194,7 @@ CFeeBumper::CFeeBumper(const CWallet *pWallet, const uint256 txidIn, const CCoin
     // This may occur if the user set TotalFee or paytxfee too low, if fallbackfee is too low, or, perhaps,
     // in a rare situation where the mempool minimum fee increased significantly since the fee estimation just a
     // moment earlier. In this case, we report an error to the user, who may use totalFee to make an adjustment.
-    CFeeRate minMempoolFeeRate = mempool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
+    CFeeRate minMempoolFeeRate = mempool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
     if (nNewFeeRate.GetFeePerK() < minMempoolFeeRate.GetFeePerK()) {
         vErrors.push_back(strprintf("New fee rate (%s) is less than the minimum fee rate (%s) to get into the mempool. totalFee value should to be at least %s or settxfee value should be at least %s to add transaction.", FormatMoney(nNewFeeRate.GetFeePerK()), FormatMoney(minMempoolFeeRate.GetFeePerK()), FormatMoney(minMempoolFeeRate.GetFee(maxNewTxSize)), FormatMoney(minMempoolFeeRate.GetFeePerK())));
         currentResult = BumpFeeResult::WALLET_ERROR;
@@ -241,12 +242,13 @@ bool CFeeBumper::commit(CWallet *pWallet)
     if (!vErrors.empty() || currentResult != BumpFeeResult::OK) {
         return false;
     }
-    if (txid.IsNull() || !pWallet->mapWallet.count(txid)) {
+    auto it = txid.IsNull() ? pWallet->mapWallet.end() : pWallet->mapWallet.find(txid);
+    if (it == pWallet->mapWallet.end()) {
         vErrors.push_back("Invalid or non-wallet transaction id");
         currentResult = BumpFeeResult::MISC_ERROR;
         return false;
     }
-    CWalletTx& oldWtx = pWallet->mapWallet[txid];
+    CWalletTx& oldWtx = it->second;
 
     // make sure the transaction still has no descendants and hasn't been mined in the meantime
     if (!preconditionChecks(pWallet, oldWtx)) {
diff --git a/src/wallet/fees.cpp b/src/wallet/fees.cpp
new file mode 100644
index 000000000..76eeeeda0
--- /dev/null
+++ b/src/wallet/fees.cpp
@@ -0,0 +1,89 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "wallet/fees.h"
+
+#include "policy/policy.h"
+#include "txmempool.h"
+#include "util.h"
+#include "validation.h"
+#include "wallet/coincontrol.h"
+#include "wallet/wallet.h"
+
+
+CAmount GetRequiredFee(unsigned int nTxBytes)
+{
+    return std::max(CWallet::minTxFee.GetFee(nTxBytes), ::minRelayTxFee.GetFee(nTxBytes));
+}
+
+
+CAmount GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc)
+{
+    /* User control of how to calculate fee uses the following parameter precedence:
+       1. coin_control.m_feerate
+       2. coin_control.m_confirm_target
+       3. payTxFee (user-set global variable)
+       4. nTxConfirmTarget (user-set global variable)
+       The first parameter that is set is used.
+    */
+    CAmount fee_needed;
+    if (coin_control.m_feerate) { // 1.
+        fee_needed = coin_control.m_feerate->GetFee(nTxBytes);
+        if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
+        // Allow to override automatic min/max check over coin control instance
+        if (coin_control.fOverrideFeeRate) return fee_needed;
+    }
+    else if (!coin_control.m_confirm_target && ::payTxFee != CFeeRate(0)) { // 3. TODO: remove magic value of 0 for global payTxFee
+        fee_needed = ::payTxFee.GetFee(nTxBytes);
+        if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
+    }
+    else { // 2. or 4.
+        // We will use smart fee estimation
+        unsigned int target = coin_control.m_confirm_target ? *coin_control.m_confirm_target : ::nTxConfirmTarget;
+        // By default estimates are economical iff we are signaling opt-in-RBF
+        bool conservative_estimate = !coin_control.signalRbf;
+        // Allow to override the default fee estimate mode over the CoinControl instance
+        if (coin_control.m_fee_mode == FeeEstimateMode::CONSERVATIVE) conservative_estimate = true;
+        else if (coin_control.m_fee_mode == FeeEstimateMode::ECONOMICAL) conservative_estimate = false;
+
+        fee_needed = estimator.estimateSmartFee(target, feeCalc, conservative_estimate).GetFee(nTxBytes);
+        if (fee_needed == 0) {
+            // if we don't have enough data for estimateSmartFee, then use fallbackFee
+            fee_needed = CWallet::fallbackFee.GetFee(nTxBytes);
+            if (feeCalc) feeCalc->reason = FeeReason::FALLBACK;
+        }
+        // Obey mempool min fee when using smart fee estimation
+        CAmount min_mempool_fee = pool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nTxBytes);
+        if (fee_needed < min_mempool_fee) {
+            fee_needed = min_mempool_fee;
+            if (feeCalc) feeCalc->reason = FeeReason::MEMPOOL_MIN;
+        }
+    }
+
+    // prevent user from paying a fee below minRelayTxFee or minTxFee
+    CAmount required_fee = GetRequiredFee(nTxBytes);
+    if (required_fee > fee_needed) {
+        fee_needed = required_fee;
+        if (feeCalc) feeCalc->reason = FeeReason::REQUIRED;
+    }
+    // But always obey the maximum
+    if (fee_needed > maxTxFee) {
+        fee_needed = maxTxFee;
+        if (feeCalc) feeCalc->reason = FeeReason::MAXTXFEE;
+    }
+    return fee_needed;
+}
+
+
+CFeeRate GetDiscardRate(const CBlockPolicyEstimator& estimator)
+{
+    unsigned int highest_target = estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
+    CFeeRate discard_rate = estimator.estimateSmartFee(highest_target, nullptr /* FeeCalculation */, false /* conservative */);
+    // Don't let discard_rate be greater than longest possible fee estimate if we get a valid fee estimate
+    discard_rate = (discard_rate == CFeeRate(0)) ? CWallet::m_discard_rate : std::min(discard_rate, CWallet::m_discard_rate);
+    // Discard rate must be at least dustRelayFee
+    discard_rate = std::max(discard_rate, ::dustRelayFee);
+    return discard_rate;
+}
diff --git a/src/wallet/fees.h b/src/wallet/fees.h
new file mode 100644
index 000000000..7b8a7dc86
--- /dev/null
+++ b/src/wallet/fees.h
@@ -0,0 +1,34 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_WALLET_FEES_H
+#define BITCOIN_WALLET_FEES_H
+
+#include "amount.h"
+
+class CBlockPolicyEstimator;
+class CCoinControl;
+class CFeeRate;
+class CTxMemPool;
+struct FeeCalculation;
+
+/**
+ * Return the minimum required fee taking into account the
+ * floating relay fee and user set minimum transaction fee
+ */
+CAmount GetRequiredFee(unsigned int nTxBytes);
+
+/**
+ * Estimate the minimum fee considering user set parameters
+ * and the required fee
+ */
+CAmount GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc);
+
+/**
+ * Return the maximum feerate for discarding change.
+ */
+CFeeRate GetDiscardRate(const CBlockPolicyEstimator& estimator);
+
+#endif // BITCOIN_WALLET_FEES_H
diff --git a/src/wallet/init.cpp b/src/wallet/init.cpp
new file mode 100644
index 000000000..c984df1df
--- /dev/null
+++ b/src/wallet/init.cpp
@@ -0,0 +1,279 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "wallet/init.h"
+
+#include "net.h"
+#include "util.h"
+#include "utilmoneystr.h"
+#include "validation.h"
+#include "wallet/wallet.h"
+#include "wallet/rpcwallet.h"
+
+std::string GetWalletHelpString(bool showDebug)
+{
+    std::string strUsage = HelpMessageGroup(_("Wallet options:"));
+    strUsage += HelpMessageOpt("-disablewallet", _("Do not load the wallet and disable wallet RPC calls"));
+    strUsage += HelpMessageOpt("-keypool=<n>", strprintf(_("Set key pool size to <n> (default: %u)"), DEFAULT_KEYPOOL_SIZE));
+    strUsage += HelpMessageOpt("-fallbackfee=<amt>", strprintf(_("A fee rate (in %s/kB) that will be used when fee estimation has insufficient data (default: %s)"),
+                                                               CURRENCY_UNIT, FormatMoney(DEFAULT_FALLBACK_FEE)));
+    strUsage += HelpMessageOpt("-discardfee=<amt>", strprintf(_("The fee rate (in %s/kB) that indicates your tolerance for discarding change by adding it to the fee (default: %s). "
+                                                                "Note: An output is discarded if it is dust at this rate, but we will always discard up to the dust relay fee and a discard fee above that is limited by the fee estimate for the longest target"),
+                                                              CURRENCY_UNIT, FormatMoney(DEFAULT_DISCARD_FEE)));
+    strUsage += HelpMessageOpt("-mintxfee=<amt>", strprintf(_("Fees (in %s/kB) smaller than this are considered zero fee for transaction creation (default: %s)"),
+                                                            CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MINFEE)));
+    strUsage += HelpMessageOpt("-paytxfee=<amt>", strprintf(_("Fee (in %s/kB) to add to transactions you send (default: %s)"),
+                                                            CURRENCY_UNIT, FormatMoney(payTxFee.GetFeePerK())));
+    strUsage += HelpMessageOpt("-rescan", _("Rescan the block chain for missing wallet transactions on startup"));
+    strUsage += HelpMessageOpt("-salvagewallet", _("Attempt to recover private keys from a corrupt wallet on startup"));
+    strUsage += HelpMessageOpt("-spendzeroconfchange", strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), DEFAULT_SPEND_ZEROCONF_CHANGE));
+    strUsage += HelpMessageOpt("-txconfirmtarget=<n>", strprintf(_("If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: %u)"), DEFAULT_TX_CONFIRM_TARGET));
+    strUsage += HelpMessageOpt("-walletrbf", strprintf(_("Send transactions with full-RBF opt-in enabled (default: %u)"), DEFAULT_WALLET_RBF));
+    strUsage += HelpMessageOpt("-upgradewallet", _("Upgrade wallet to latest format on startup"));
+    strUsage += HelpMessageOpt("-wallet=<file>", _("Specify wallet file (within data directory)") + " " + strprintf(_("(default: %s)"), DEFAULT_WALLET_DAT));
+    strUsage += HelpMessageOpt("-walletbroadcast", _("Make the wallet broadcast transactions") + " " + strprintf(_("(default: %u)"), DEFAULT_WALLETBROADCAST));
+    strUsage += HelpMessageOpt("-walletnotify=<cmd>", _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)"));
+    strUsage += HelpMessageOpt("-zapwallettxes=<mode>", _("Delete all wallet transactions and only recover those parts of the blockchain through -rescan on startup") +
+                               " " + _("(1 = keep tx meta data e.g. account owner and payment request information, 2 = drop tx meta data)"));
+
+    if (showDebug)
+    {
+        strUsage += HelpMessageGroup(_("Wallet debugging/testing options:"));
+
+        strUsage += HelpMessageOpt("-dblogsize=<n>", strprintf("Flush wallet database activity from memory to disk log every <n> megabytes (default: %u)", DEFAULT_WALLET_DBLOGSIZE));
+        strUsage += HelpMessageOpt("-flushwallet", strprintf("Run a thread to flush wallet periodically (default: %u)", DEFAULT_FLUSHWALLET));
+        strUsage += HelpMessageOpt("-privdb", strprintf("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)", DEFAULT_WALLET_PRIVDB));
+        strUsage += HelpMessageOpt("-walletrejectlongchains", strprintf(_("Wallet will not create transactions that violate mempool chain limits (default: %u)"), DEFAULT_WALLET_REJECT_LONG_CHAINS));
+    }
+
+    return strUsage;
+}
+
+bool WalletParameterInteraction()
+{
+    gArgs.SoftSetArg("-wallet", DEFAULT_WALLET_DAT);
+    const bool is_multiwallet = gArgs.GetArgs("-wallet").size() > 1;
+
+    if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET))
+        return true;
+
+    if (gArgs.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY) && gArgs.SoftSetBoolArg("-walletbroadcast", false)) {
+        LogPrintf("%s: parameter interaction: -blocksonly=1 -> setting -walletbroadcast=0\n", __func__);
+    }
+
+    if (gArgs.GetBoolArg("-salvagewallet", false)) {
+        if (is_multiwallet) {
+            return InitError(strprintf("%s is only allowed with a single wallet file", "-salvagewallet"));
+        }
+        // Rewrite just private keys: rescan to find transactions
+        if (gArgs.SoftSetBoolArg("-rescan", true)) {
+            LogPrintf("%s: parameter interaction: -salvagewallet=1 -> setting -rescan=1\n", __func__);
+        }
+    }
+
+    int zapwallettxes = gArgs.GetArg("-zapwallettxes", 0);
+    // -zapwallettxes implies dropping the mempool on startup
+    if (zapwallettxes != 0 && gArgs.SoftSetBoolArg("-persistmempool", false)) {
+        LogPrintf("%s: parameter interaction: -zapwallettxes=%s -> setting -persistmempool=0\n", __func__, zapwallettxes);
+    }
+
+    // -zapwallettxes implies a rescan
+    if (zapwallettxes != 0) {
+        if (is_multiwallet) {
+            return InitError(strprintf("%s is only allowed with a single wallet file", "-zapwallettxes"));
+        }
+        if (gArgs.SoftSetBoolArg("-rescan", true)) {
+            LogPrintf("%s: parameter interaction: -zapwallettxes=%s -> setting -rescan=1\n", __func__, zapwallettxes);
+        }
+    }
+
+    if (is_multiwallet) {
+        if (gArgs.GetBoolArg("-upgradewallet", false)) {
+            return InitError(strprintf("%s is only allowed with a single wallet file", "-upgradewallet"));
+        }
+    }
+
+    if (gArgs.GetBoolArg("-sysperms", false))
+        return InitError("-sysperms is not allowed in combination with enabled wallet functionality");
+    if (gArgs.GetArg("-prune", 0) && gArgs.GetBoolArg("-rescan", false))
+        return InitError(_("Rescans are not possible in pruned mode. You will need to use -reindex which will download the whole blockchain again."));
+
+    if (::minRelayTxFee.GetFeePerK() > HIGH_TX_FEE_PER_KB)
+        InitWarning(AmountHighWarn("-minrelaytxfee") + " " +
+                    _("The wallet will avoid paying less than the minimum relay fee."));
+
+    if (gArgs.IsArgSet("-mintxfee"))
+    {
+        CAmount n = 0;
+        if (!ParseMoney(gArgs.GetArg("-mintxfee", ""), n) || 0 == n)
+            return InitError(AmountErrMsg("mintxfee", gArgs.GetArg("-mintxfee", "")));
+        if (n > HIGH_TX_FEE_PER_KB)
+            InitWarning(AmountHighWarn("-mintxfee") + " " +
+                        _("This is the minimum transaction fee you pay on every transaction."));
+        CWallet::minTxFee = CFeeRate(n);
+    }
+    if (gArgs.IsArgSet("-fallbackfee"))
+    {
+        CAmount nFeePerK = 0;
+        if (!ParseMoney(gArgs.GetArg("-fallbackfee", ""), nFeePerK))
+            return InitError(strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'"), gArgs.GetArg("-fallbackfee", "")));
+        if (nFeePerK > HIGH_TX_FEE_PER_KB)
+            InitWarning(AmountHighWarn("-fallbackfee") + " " +
+                        _("This is the transaction fee you may pay when fee estimates are not available."));
+        CWallet::fallbackFee = CFeeRate(nFeePerK);
+    }
+    if (gArgs.IsArgSet("-discardfee"))
+    {
+        CAmount nFeePerK = 0;
+        if (!ParseMoney(gArgs.GetArg("-discardfee", ""), nFeePerK))
+            return InitError(strprintf(_("Invalid amount for -discardfee=<amount>: '%s'"), gArgs.GetArg("-discardfee", "")));
+        if (nFeePerK > HIGH_TX_FEE_PER_KB)
+            InitWarning(AmountHighWarn("-discardfee") + " " +
+                        _("This is the transaction fee you may discard if change is smaller than dust at this level"));
+        CWallet::m_discard_rate = CFeeRate(nFeePerK);
+    }
+    if (gArgs.IsArgSet("-paytxfee"))
+    {
+        CAmount nFeePerK = 0;
+        if (!ParseMoney(gArgs.GetArg("-paytxfee", ""), nFeePerK))
+            return InitError(AmountErrMsg("paytxfee", gArgs.GetArg("-paytxfee", "")));
+        if (nFeePerK > HIGH_TX_FEE_PER_KB)
+            InitWarning(AmountHighWarn("-paytxfee") + " " +
+                        _("This is the transaction fee you will pay if you send a transaction."));
+
+        payTxFee = CFeeRate(nFeePerK, 1000);
+        if (payTxFee < ::minRelayTxFee)
+        {
+            return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
+                                       gArgs.GetArg("-paytxfee", ""), ::minRelayTxFee.ToString()));
+        }
+    }
+    if (gArgs.IsArgSet("-maxtxfee"))
+    {
+        CAmount nMaxFee = 0;
+        if (!ParseMoney(gArgs.GetArg("-maxtxfee", ""), nMaxFee))
+            return InitError(AmountErrMsg("maxtxfee", gArgs.GetArg("-maxtxfee", "")));
+        if (nMaxFee > HIGH_MAX_TX_FEE)
+            InitWarning(_("-maxtxfee is set very high! Fees this large could be paid on a single transaction."));
+        maxTxFee = nMaxFee;
+        if (CFeeRate(maxTxFee, 1000) < ::minRelayTxFee)
+        {
+            return InitError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"),
+                                       gArgs.GetArg("-maxtxfee", ""), ::minRelayTxFee.ToString()));
+        }
+    }
+    nTxConfirmTarget = gArgs.GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
+    bSpendZeroConfChange = gArgs.GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
+    fWalletRbf = gArgs.GetBoolArg("-walletrbf", DEFAULT_WALLET_RBF);
+
+    return true;
+}
+
+void RegisterWalletRPC(CRPCTable &t)
+{
+    if (gArgs.GetBoolArg("-disablewallet", false)) return;
+
+    RegisterWalletRPCCommands(t);
+}
+
+bool VerifyWallets()
+{
+    if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET))
+        return true;
+
+    uiInterface.InitMessage(_("Verifying wallet(s)..."));
+
+    // Keep track of each wallet absolute path to detect duplicates.
+    std::set<fs::path> wallet_paths;
+
+    for (const std::string& walletFile : gArgs.GetArgs("-wallet")) {
+        if (boost::filesystem::path(walletFile).filename() != walletFile) {
+            return InitError(strprintf(_("Error loading wallet %s. -wallet parameter must only specify a filename (not a path)."), walletFile));
+        }
+
+        if (SanitizeString(walletFile, SAFE_CHARS_FILENAME) != walletFile) {
+            return InitError(strprintf(_("Error loading wallet %s. Invalid characters in -wallet filename."), walletFile));
+        }
+
+        fs::path wallet_path = fs::absolute(walletFile, GetDataDir());
+
+        if (fs::exists(wallet_path) && (!fs::is_regular_file(wallet_path) || fs::is_symlink(wallet_path))) {
+            return InitError(strprintf(_("Error loading wallet %s. -wallet filename must be a regular file."), walletFile));
+        }
+
+        if (!wallet_paths.insert(wallet_path).second) {
+            return InitError(strprintf(_("Error loading wallet %s. Duplicate -wallet filename specified."), walletFile));
+        }
+
+        std::string strError;
+        if (!CWalletDB::VerifyEnvironment(walletFile, GetDataDir().string(), strError)) {
+            return InitError(strError);
+        }
+
+        if (gArgs.GetBoolArg("-salvagewallet", false)) {
+            // Recover readable keypairs:
+            CWallet dummyWallet;
+            std::string backup_filename;
+            if (!CWalletDB::Recover(walletFile, (void *)&dummyWallet, CWalletDB::RecoverKeysOnlyFilter, backup_filename)) {
+                return false;
+            }
+        }
+
+        std::string strWarning;
+        bool dbV = CWalletDB::VerifyDatabaseFile(walletFile, GetDataDir().string(), strWarning, strError);
+        if (!strWarning.empty()) {
+            InitWarning(strWarning);
+        }
+        if (!dbV) {
+            InitError(strError);
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool OpenWallets()
+{
+    if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
+        LogPrintf("Wallet disabled!\n");
+        return true;
+    }
+
+    for (const std::string& walletFile : gArgs.GetArgs("-wallet")) {
+        CWallet * const pwallet = CWallet::CreateWalletFromFile(walletFile);
+        if (!pwallet) {
+            return false;
+        }
+        vpwallets.push_back(pwallet);
+    }
+
+    return true;
+}
+
+void StartWallets(CScheduler& scheduler) {
+    for (CWalletRef pwallet : vpwallets) {
+        pwallet->postInitProcess(scheduler);
+    }
+}
+
+void FlushWallets() {
+    for (CWalletRef pwallet : vpwallets) {
+        pwallet->Flush(false);
+    }
+}
+
+void StopWallets() {
+    for (CWalletRef pwallet : vpwallets) {
+        pwallet->Flush(true);
+    }
+}
+
+void CloseWallets() {
+    for (CWalletRef pwallet : vpwallets) {
+        delete pwallet;
+    }
+    vpwallets.clear();
+}
diff --git a/src/wallet/init.h b/src/wallet/init.h
new file mode 100644
index 000000000..0b3ee2dda
--- /dev/null
+++ b/src/wallet/init.h
@@ -0,0 +1,43 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_WALLET_INIT_H
+#define BITCOIN_WALLET_INIT_H
+
+#include <string>
+
+class CRPCTable;
+class CScheduler;
+
+//! Return the wallets help message.
+std::string GetWalletHelpString(bool showDebug);
+
+//! Wallets parameter interaction
+bool WalletParameterInteraction();
+
+//! Register wallet RPCs.
+void RegisterWalletRPC(CRPCTable &tableRPC);
+
+//! Responsible for reading and validating the -wallet arguments and verifying the wallet database.
+//  This function will perform salvage on the wallet if requested, as long as only one wallet is
+//  being loaded (WalletParameterInteraction forbids -salvagewallet, -zapwallettxes or -upgradewallet with multiwallet).
+bool VerifyWallets();
+
+//! Load wallet databases.
+bool OpenWallets();
+
+//! Complete startup of wallets.
+void StartWallets(CScheduler& scheduler);
+
+//! Flush all wallets in preparation for shutdown.
+void FlushWallets();
+
+//! Stop all wallets. Wallets will be flushed first.
+void StopWallets();
+
+//! Close all wallets.
+void CloseWallets();
+
+#endif // BITCOIN_WALLET_INIT_H
diff --git a/src/wallet/rpcdump.cpp b/src/wallet/rpcdump.cpp
index 5abf32480..3ec4a5efb 100644
--- a/src/wallet/rpcdump.cpp
+++ b/src/wallet/rpcdump.cpp
@@ -4,6 +4,7 @@
 
 #include "base58.h"
 #include "chain.h"
+#include "rpc/safemode.h"
 #include "rpc/server.h"
 #include "init.h"
 #include "validation.h"
@@ -79,10 +80,10 @@ UniValue importprivkey(const JSONRPCRequest& request)
 
     if (request.fHelp || request.params.size() < 1 || request.params.size() > 3)
         throw std::runtime_error(
-            "importprivkey \"bitcoinprivkey\" ( \"label\" ) ( rescan )\n"
+            "importprivkey \"privkey\" ( \"label\" ) ( rescan )\n"
             "\nAdds a private key (as returned by dumpprivkey) to your wallet.\n"
             "\nArguments:\n"
-            "1. \"bitcoinprivkey\"   (string, required) The private key (see dumpprivkey)\n"
+            "1. \"privkey\"          (string, required) The private key (see dumpprivkey)\n"
             "2. \"label\"            (string, optional, default=\"\") An optional label\n"
             "3. rescan               (boolean, optional, default=true) Rescan the wallet for transactions\n"
             "\nNote: This call can take minutes to complete if rescan is true.\n"
@@ -174,12 +175,13 @@ UniValue abortrescan(const JSONRPCRequest& request)
             + HelpExampleRpc("abortrescan", "")
         );
 
+    ObserveSafeMode();
     if (!pwallet->IsScanning() || pwallet->IsAbortingRescan()) return false;
     pwallet->AbortRescan();
     return true;
 }
 
-void ImportAddress(CWallet*, const CBitcoinAddress& address, const std::string& strLabel);
+void ImportAddress(CWallet*, const CTxDestination& dest, const std::string& strLabel);
 void ImportScript(CWallet* const pwallet, const CScript& script, const std::string& strLabel, bool isRedeemScript)
 {
     if (!isRedeemScript && ::IsMine(*pwallet, script) == ISMINE_SPENDABLE) {
@@ -196,7 +198,7 @@ void ImportScript(CWallet* const pwallet, const CScript& script, const std::stri
         if (!pwallet->HaveCScript(script) && !pwallet->AddCScript(script)) {
             throw JSONRPCError(RPC_WALLET_ERROR, "Error adding p2sh redeemScript to wallet");
         }
-        ImportAddress(pwallet, CBitcoinAddress(CScriptID(script)), strLabel);
+        ImportAddress(pwallet, CScriptID(script), strLabel);
     } else {
         CTxDestination destination;
         if (ExtractDestination(script, destination)) {
@@ -205,13 +207,13 @@ void ImportScript(CWallet* const pwallet, const CScript& script, const std::stri
     }
 }
 
-void ImportAddress(CWallet* const pwallet, const CBitcoinAddress& address, const std::string& strLabel)
+void ImportAddress(CWallet* const pwallet, const CTxDestination& dest, const std::string& strLabel)
 {
-    CScript script = GetScriptForDestination(address.Get());
+    CScript script = GetScriptForDestination(dest);
     ImportScript(pwallet, script, strLabel, false);
     // add to address book or update label
-    if (address.IsValid())
-        pwallet->SetAddressBook(address.Get(), strLabel, "receive");
+    if (IsValidDestination(dest))
+        pwallet->SetAddressBook(dest, strLabel, "receive");
 }
 
 UniValue importaddress(const JSONRPCRequest& request)
@@ -263,11 +265,12 @@ UniValue importaddress(const JSONRPCRequest& request)
 
     LOCK2(cs_main, pwallet->cs_wallet);
 
-    CBitcoinAddress address(request.params[0].get_str());
-    if (address.IsValid()) {
-        if (fP2SH)
+    CTxDestination dest = DecodeDestination(request.params[0].get_str());
+    if (IsValidDestination(dest)) {
+        if (fP2SH) {
             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Cannot use the p2sh flag with an address - use a script instead");
-        ImportAddress(pwallet, address, strLabel);
+        }
+        ImportAddress(pwallet, dest, strLabel);
     } else if (IsHex(request.params[0].get_str())) {
         std::vector<unsigned char> data(ParseHex(request.params[0].get_str()));
         ImportScript(pwallet, CScript(data.begin(), data.end()), strLabel, fP2SH);
@@ -430,7 +433,7 @@ UniValue importpubkey(const JSONRPCRequest& request)
 
     LOCK2(cs_main, pwallet->cs_wallet);
 
-    ImportAddress(pwallet, CBitcoinAddress(pubKey.GetID()), strLabel);
+    ImportAddress(pwallet, pubKey.GetID(), strLabel);
     ImportScript(pwallet, GetScriptForRawPubKey(pubKey), strLabel, false);
 
     if (fRescan)
@@ -504,7 +507,7 @@ UniValue importwallet(const JSONRPCRequest& request)
         assert(key.VerifyPubKey(pubkey));
         CKeyID keyid = pubkey.GetID();
         if (pwallet->HaveKey(keyid)) {
-            LogPrintf("Skipping import of %s (key already present)\n", CBitcoinAddress(keyid).ToString());
+            LogPrintf("Skipping import of %s (key already present)\n", EncodeDestination(keyid));
             continue;
         }
         int64_t nTime = DecodeDumpTime(vstr[1]);
@@ -522,7 +525,7 @@ UniValue importwallet(const JSONRPCRequest& request)
                 fLabel = true;
             }
         }
-        LogPrintf("Importing %s...\n", CBitcoinAddress(keyid).ToString());
+        LogPrintf("Importing %s...\n", EncodeDestination(keyid));
         if (!pwallet->AddKeyPubKey(key, pubkey)) {
             fGood = false;
             continue;
@@ -571,14 +574,16 @@ UniValue dumpprivkey(const JSONRPCRequest& request)
     EnsureWalletIsUnlocked(pwallet);
 
     std::string strAddress = request.params[0].get_str();
-    CBitcoinAddress address;
-    if (!address.SetString(strAddress))
+    CTxDestination dest = DecodeDestination(strAddress);
+    if (!IsValidDestination(dest)) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid Bitcoin address");
-    CKeyID keyID;
-    if (!address.GetKeyID(keyID))
+    }
+    const CKeyID *keyID = boost::get<CKeyID>(&dest);
+    if (!keyID) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Address does not refer to a key");
+    }
     CKey vchSecret;
-    if (!pwallet->GetKey(keyID, vchSecret)) {
+    if (!pwallet->GetKey(*keyID, vchSecret)) {
         throw JSONRPCError(RPC_WALLET_ERROR, "Private key for address " + strAddress + " is not known");
     }
     return CBitcoinSecret(vchSecret).ToString();
@@ -595,7 +600,7 @@ UniValue dumpwallet(const JSONRPCRequest& request)
     if (request.fHelp || request.params.size() != 1)
         throw std::runtime_error(
             "dumpwallet \"filename\"\n"
-            "\nDumps all wallet keys in a human-readable format.\n"
+            "\nDumps all wallet keys in a human-readable format to a server-side file. This does not allow overwriting existing files.\n"
             "\nArguments:\n"
             "1. \"filename\"    (string, required) The filename with path (either absolute or relative to bitcoind)\n"
             "\nResult:\n"
@@ -611,17 +616,26 @@ UniValue dumpwallet(const JSONRPCRequest& request)
 
     EnsureWalletIsUnlocked(pwallet);
 
-    std::ofstream file;
     boost::filesystem::path filepath = request.params[0].get_str();
     filepath = boost::filesystem::absolute(filepath);
+
+    /* Prevent arbitrary files from being overwritten. There have been reports
+     * that users have overwritten wallet files this way:
+     * https://github.com/bitcoin/bitcoin/issues/9934
+     * It may also avoid other security issues.
+     */
+    if (boost::filesystem::exists(filepath)) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, filepath.string() + " already exists. If you are sure this is what you want, move it out of the way first");
+    }
+
+    std::ofstream file;
     file.open(filepath.string().c_str());
     if (!file.is_open())
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot open wallet dump file");
 
     std::map<CTxDestination, int64_t> mapKeyBirth;
-    std::set<CKeyID> setKeyPool;
+    const std::map<CKeyID, int64_t>& mapKeyPool = pwallet->GetAllReserveKeys();
     pwallet->GetKeyBirthTimes(mapKeyBirth);
-    pwallet->GetAllReserveKeys(setKeyPool);
 
     // sort time/key pairs
     std::vector<std::pair<int64_t, CKeyID> > vKeyBirth;
@@ -658,7 +672,7 @@ UniValue dumpwallet(const JSONRPCRequest& request)
     for (std::vector<std::pair<int64_t, CKeyID> >::const_iterator it = vKeyBirth.begin(); it != vKeyBirth.end(); it++) {
         const CKeyID &keyid = it->second;
         std::string strTime = EncodeDumpTime(it->first);
-        std::string strAddr = CBitcoinAddress(keyid).ToString();
+        std::string strAddr = EncodeDestination(keyid);
         CKey key;
         if (pwallet->GetKey(keyid, key)) {
             file << strprintf("%s %s ", CBitcoinSecret(key).ToString(), strTime);
@@ -666,7 +680,7 @@ UniValue dumpwallet(const JSONRPCRequest& request)
                 file << strprintf("label=%s", EncodeDumpString(pwallet->mapAddressBook[keyid].name));
             } else if (keyid == masterKeyID) {
                 file << "hdmaster=1";
-            } else if (setKeyPool.count(keyid)) {
+            } else if (mapKeyPool.count(keyid)) {
                 file << "reserve=1";
             } else if (pwallet->mapKeyMetadata[keyid].hdKeypath == "m") {
                 file << "inactivehdmaster=1";
@@ -714,14 +728,14 @@ UniValue ProcessImport(CWallet * const pwallet, const UniValue& data, const int6
 
         // Parse the output.
         CScript script;
-        CBitcoinAddress address;
+        CTxDestination dest;
 
         if (!isScript) {
-            address = CBitcoinAddress(output);
-            if (!address.IsValid()) {
+            dest = DecodeDestination(output);
+            if (!IsValidDestination(dest)) {
                 throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid address");
             }
-            script = GetScriptForDestination(address.Get());
+            script = GetScriptForDestination(dest);
         } else {
             if (!IsHex(output)) {
                 throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid scriptPubKey");
@@ -779,8 +793,8 @@ UniValue ProcessImport(CWallet * const pwallet, const UniValue& data, const int6
                 throw JSONRPCError(RPC_WALLET_ERROR, "Error adding p2sh redeemScript to wallet");
             }
 
-            CBitcoinAddress redeemAddress = CBitcoinAddress(CScriptID(redeemScript));
-            CScript redeemDestination = GetScriptForDestination(redeemAddress.Get());
+            CTxDestination redeem_dest = CScriptID(redeemScript);
+            CScript redeemDestination = GetScriptForDestination(redeem_dest);
 
             if (::IsMine(*pwallet, redeemDestination) == ISMINE_SPENDABLE) {
                 throw JSONRPCError(RPC_WALLET_ERROR, "The wallet already contains the private key for this address or script");
@@ -793,8 +807,8 @@ UniValue ProcessImport(CWallet * const pwallet, const UniValue& data, const int6
             }
 
             // add to address book or update label
-            if (address.IsValid()) {
-                pwallet->SetAddressBook(address.Get(), label, "receive");
+            if (IsValidDestination(dest)) {
+                pwallet->SetAddressBook(dest, label, "receive");
             }
 
             // Import private keys.
@@ -853,27 +867,25 @@ UniValue ProcessImport(CWallet * const pwallet, const UniValue& data, const int6
                     throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Pubkey is not a valid public key");
                 }
 
-                CBitcoinAddress pubKeyAddress = CBitcoinAddress(pubKey.GetID());
+                CTxDestination pubkey_dest = pubKey.GetID();
 
                 // Consistency check.
-                if (!isScript && !(pubKeyAddress.Get() == address.Get())) {
+                if (!isScript && !(pubkey_dest == dest)) {
                     throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Consistency check failed");
                 }
 
                 // Consistency check.
                 if (isScript) {
-                    CBitcoinAddress scriptAddress;
                     CTxDestination destination;
 
                     if (ExtractDestination(script, destination)) {
-                        scriptAddress = CBitcoinAddress(destination);
-                        if (!(scriptAddress.Get() == pubKeyAddress.Get())) {
+                        if (!(destination == pubkey_dest)) {
                             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Consistency check failed");
                         }
                     }
                 }
 
-                CScript pubKeyScript = GetScriptForDestination(pubKeyAddress.Get());
+                CScript pubKeyScript = GetScriptForDestination(pubkey_dest);
 
                 if (::IsMine(*pwallet, pubKeyScript) == ISMINE_SPENDABLE) {
                     throw JSONRPCError(RPC_WALLET_ERROR, "The wallet already contains the private key for this address or script");
@@ -886,8 +898,8 @@ UniValue ProcessImport(CWallet * const pwallet, const UniValue& data, const int6
                 }
 
                 // add to address book or update label
-                if (pubKeyAddress.IsValid()) {
-                    pwallet->SetAddressBook(pubKeyAddress.Get(), label, "receive");
+                if (IsValidDestination(pubkey_dest)) {
+                    pwallet->SetAddressBook(pubkey_dest, label, "receive");
                 }
 
                 // TODO Is this necessary?
@@ -926,21 +938,19 @@ UniValue ProcessImport(CWallet * const pwallet, const UniValue& data, const int6
                 CPubKey pubKey = key.GetPubKey();
                 assert(key.VerifyPubKey(pubKey));
 
-                CBitcoinAddress pubKeyAddress = CBitcoinAddress(pubKey.GetID());
+                CTxDestination pubkey_dest = pubKey.GetID();
 
                 // Consistency check.
-                if (!isScript && !(pubKeyAddress.Get() == address.Get())) {
+                if (!isScript && !(pubkey_dest == dest)) {
                     throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Consistency check failed");
                 }
 
                 // Consistency check.
                 if (isScript) {
-                    CBitcoinAddress scriptAddress;
                     CTxDestination destination;
 
                     if (ExtractDestination(script, destination)) {
-                        scriptAddress = CBitcoinAddress(destination);
-                        if (!(scriptAddress.Get() == pubKeyAddress.Get())) {
+                        if (!(destination == pubkey_dest)) {
                             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Consistency check failed");
                         }
                     }
@@ -951,7 +961,7 @@ UniValue ProcessImport(CWallet * const pwallet, const UniValue& data, const int6
                 pwallet->SetAddressBook(vchAddress, label, "receive");
 
                 if (pwallet->HaveKey(vchAddress)) {
-                    return false;
+                    throw JSONRPCError(RPC_WALLET_ERROR, "The wallet already contains the private key for this address or script");
                 }
 
                 pwallet->mapKeyMetadata[vchAddress].nCreateTime = timestamp;
@@ -979,8 +989,8 @@ UniValue ProcessImport(CWallet * const pwallet, const UniValue& data, const int6
 
                 if (scriptPubKey.getType() == UniValue::VOBJ) {
                     // add to address book or update label
-                    if (address.IsValid()) {
-                        pwallet->SetAddressBook(address.Get(), label, "receive");
+                    if (IsValidDestination(dest)) {
+                        pwallet->SetAddressBook(dest, label, "receive");
                     }
                 }
 
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 057379d8d..d6989add8 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -8,7 +8,6 @@
 #include "chain.h"
 #include "consensus/validation.h"
 #include "core_io.h"
-#include "init.h"
 #include "httpserver.h"
 #include "validation.h"
 #include "net.h"
@@ -17,6 +16,7 @@
 #include "policy/policy.h"
 #include "policy/rbf.h"
 #include "rpc/mining.h"
+#include "rpc/safemode.h"
 #include "rpc/server.h"
 #include "script/sign.h"
 #include "timedata.h"
@@ -27,6 +27,8 @@
 #include "wallet/wallet.h"
 #include "wallet/walletdb.h"
 
+#include <init.h>  // For StartShutdown
+
 #include <stdint.h>
 
 #include <univalue.h>
@@ -168,18 +170,18 @@ UniValue getnewaddress(const JSONRPCRequest& request)
 
     pwallet->SetAddressBook(keyID, strAccount, "receive");
 
-    return CBitcoinAddress(keyID).ToString();
+    return EncodeDestination(keyID);
 }
 
 
-CBitcoinAddress GetAccountAddress(CWallet* const pwallet, std::string strAccount, bool bForceNew=false)
+CTxDestination GetAccountAddress(CWallet* const pwallet, std::string strAccount, bool bForceNew=false)
 {
     CPubKey pubKey;
     if (!pwallet->GetAccountPubkey(pubKey, strAccount, bForceNew)) {
         throw JSONRPCError(RPC_WALLET_KEYPOOL_RAN_OUT, "Error: Keypool ran out, please call keypoolrefill first");
     }
 
-    return CBitcoinAddress(pubKey.GetID());
+    return pubKey.GetID();
 }
 
 UniValue getaccountaddress(const JSONRPCRequest& request)
@@ -211,7 +213,7 @@ UniValue getaccountaddress(const JSONRPCRequest& request)
 
     UniValue ret(UniValue::VSTR);
 
-    ret = GetAccountAddress(pwallet, strAccount).ToString();
+    ret = EncodeDestination(GetAccountAddress(pwallet, strAccount));
     return ret;
 }
 
@@ -250,7 +252,7 @@ UniValue getrawchangeaddress(const JSONRPCRequest& request)
 
     CKeyID keyID = vchPubKey.GetID();
 
-    return CBitcoinAddress(keyID).ToString();
+    return EncodeDestination(keyID);
 }
 
 
@@ -275,24 +277,25 @@ UniValue setaccount(const JSONRPCRequest& request)
 
     LOCK2(cs_main, pwallet->cs_wallet);
 
-    CBitcoinAddress address(request.params[0].get_str());
-    if (!address.IsValid())
+    CTxDestination dest = DecodeDestination(request.params[0].get_str());
+    if (!IsValidDestination(dest)) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid Bitcoin address");
+    }
 
     std::string strAccount;
-    if (request.params.size() > 1)
+    if (!request.params[1].isNull())
         strAccount = AccountFromValue(request.params[1]);
 
     // Only add the account if the address is yours.
-    if (IsMine(*pwallet, address.Get())) {
+    if (IsMine(*pwallet, dest)) {
         // Detect when changing the account of an address that is the 'unused current key' of another account:
-        if (pwallet->mapAddressBook.count(address.Get())) {
-            std::string strOldAccount = pwallet->mapAddressBook[address.Get()].name;
-            if (address == GetAccountAddress(pwallet, strOldAccount)) {
+        if (pwallet->mapAddressBook.count(dest)) {
+            std::string strOldAccount = pwallet->mapAddressBook[dest].name;
+            if (dest == GetAccountAddress(pwallet, strOldAccount)) {
                 GetAccountAddress(pwallet, strOldAccount, true);
             }
         }
-        pwallet->SetAddressBook(address.Get(), strAccount, "receive");
+        pwallet->SetAddressBook(dest, strAccount, "receive");
     }
     else
         throw JSONRPCError(RPC_MISC_ERROR, "setaccount can only be used with own address");
@@ -323,12 +326,13 @@ UniValue getaccount(const JSONRPCRequest& request)
 
     LOCK2(cs_main, pwallet->cs_wallet);
 
-    CBitcoinAddress address(request.params[0].get_str());
-    if (!address.IsValid())
+    CTxDestination dest = DecodeDestination(request.params[0].get_str());
+    if (!IsValidDestination(dest)) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid Bitcoin address");
+    }
 
     std::string strAccount;
-    std::map<CTxDestination, CAddressBookData>::iterator mi = pwallet->mapAddressBook.find(address.Get());
+    std::map<CTxDestination, CAddressBookData>::iterator mi = pwallet->mapAddressBook.find(dest);
     if (mi != pwallet->mapAddressBook.end() && !(*mi).second.name.empty()) {
         strAccount = (*mi).second.name;
     }
@@ -365,11 +369,12 @@ UniValue getaddressesbyaccount(const JSONRPCRequest& request)
 
     // Find all addresses that have the given account
     UniValue ret(UniValue::VARR);
-    for (const std::pair<CBitcoinAddress, CAddressBookData>& item : pwallet->mapAddressBook) {
-        const CBitcoinAddress& address = item.first;
+    for (const std::pair<CTxDestination, CAddressBookData>& item : pwallet->mapAddressBook) {
+        const CTxDestination& dest = item.first;
         const std::string& strName = item.second.name;
-        if (strName == strAccount)
-            ret.push_back(address.ToString());
+        if (strName == strAccount) {
+            ret.push_back(EncodeDestination(dest));
+        }
     }
     return ret;
 }
@@ -449,11 +454,13 @@ UniValue sendtoaddress(const JSONRPCRequest& request)
             + HelpExampleRpc("sendtoaddress", "\"1M72Sfpbz1BPpXFHz9m3CdqATR44Jvaydd\", 0.1, \"donation\", \"seans outpost\"")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
-    CBitcoinAddress address(request.params[0].get_str());
-    if (!address.IsValid())
-        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid Bitcoin address");
+    CTxDestination dest = DecodeDestination(request.params[0].get_str());
+    if (!IsValidDestination(dest)) {
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid address");
+    }
 
     // Amount
     CAmount nAmount = AmountFromValue(request.params[1]);
@@ -462,26 +469,26 @@ UniValue sendtoaddress(const JSONRPCRequest& request)
 
     // Wallet comments
     CWalletTx wtx;
-    if (request.params.size() > 2 && !request.params[2].isNull() && !request.params[2].get_str().empty())
+    if (!request.params[2].isNull() && !request.params[2].get_str().empty())
         wtx.mapValue["comment"] = request.params[2].get_str();
-    if (request.params.size() > 3 && !request.params[3].isNull() && !request.params[3].get_str().empty())
+    if (!request.params[3].isNull() && !request.params[3].get_str().empty())
         wtx.mapValue["to"]      = request.params[3].get_str();
 
     bool fSubtractFeeFromAmount = false;
-    if (request.params.size() > 4 && !request.params[4].isNull()) {
+    if (!request.params[4].isNull()) {
         fSubtractFeeFromAmount = request.params[4].get_bool();
     }
 
     CCoinControl coin_control;
-    if (request.params.size() > 5 && !request.params[5].isNull()) {
+    if (!request.params[5].isNull()) {
         coin_control.signalRbf = request.params[5].get_bool();
     }
 
-    if (request.params.size() > 6 && !request.params[6].isNull()) {
+    if (!request.params[6].isNull()) {
         coin_control.m_confirm_target = ParseConfirmTarget(request.params[6]);
     }
 
-    if (request.params.size() > 7 && !request.params[7].isNull()) {
+    if (!request.params[7].isNull()) {
         if (!FeeModeFromString(request.params[7].get_str(), coin_control.m_fee_mode)) {
             throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid estimate_mode parameter");
         }
@@ -490,7 +497,7 @@ UniValue sendtoaddress(const JSONRPCRequest& request)
 
     EnsureWalletIsUnlocked(pwallet);
 
-    SendMoney(pwallet, address.Get(), nAmount, fSubtractFeeFromAmount, wtx, coin_control);
+    SendMoney(pwallet, dest, nAmount, fSubtractFeeFromAmount, wtx, coin_control);
 
     return wtx.GetHash().GetHex();
 }
@@ -525,20 +532,21 @@ UniValue listaddressgroupings(const JSONRPCRequest& request)
             + HelpExampleRpc("listaddressgroupings", "")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     UniValue jsonGroupings(UniValue::VARR);
     std::map<CTxDestination, CAmount> balances = pwallet->GetAddressBalances();
-    for (std::set<CTxDestination> grouping : pwallet->GetAddressGroupings()) {
+    for (const std::set<CTxDestination>& grouping : pwallet->GetAddressGroupings()) {
         UniValue jsonGrouping(UniValue::VARR);
-        for (CTxDestination address : grouping)
+        for (const CTxDestination& address : grouping)
         {
             UniValue addressInfo(UniValue::VARR);
-            addressInfo.push_back(CBitcoinAddress(address).ToString());
+            addressInfo.push_back(EncodeDestination(address));
             addressInfo.push_back(ValueFromAmount(balances[address]));
             {
-                if (pwallet->mapAddressBook.find(CBitcoinAddress(address).Get()) != pwallet->mapAddressBook.end()) {
-                    addressInfo.push_back(pwallet->mapAddressBook.find(CBitcoinAddress(address).Get())->second.name);
+                if (pwallet->mapAddressBook.find(address) != pwallet->mapAddressBook.end()) {
+                    addressInfo.push_back(pwallet->mapAddressBook.find(address)->second.name);
                 }
             }
             jsonGrouping.push_back(addressInfo);
@@ -583,16 +591,18 @@ UniValue signmessage(const JSONRPCRequest& request)
     std::string strAddress = request.params[0].get_str();
     std::string strMessage = request.params[1].get_str();
 
-    CBitcoinAddress addr(strAddress);
-    if (!addr.IsValid())
+    CTxDestination dest = DecodeDestination(strAddress);
+    if (!IsValidDestination(dest)) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Invalid address");
+    }
 
-    CKeyID keyID;
-    if (!addr.GetKeyID(keyID))
+    const CKeyID *keyID = boost::get<CKeyID>(&dest);
+    if (!keyID) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Address does not refer to key");
+    }
 
     CKey key;
-    if (!pwallet->GetKey(keyID, key)) {
+    if (!pwallet->GetKey(*keyID, key)) {
         throw JSONRPCError(RPC_WALLET_ERROR, "Private key not available");
     }
 
@@ -604,7 +614,7 @@ UniValue signmessage(const JSONRPCRequest& request)
     if (!key.SignCompact(ss.GetHash(), vchSig))
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Sign failed");
 
-    return EncodeBase64(&vchSig[0], vchSig.size());
+    return EncodeBase64(vchSig.data(), vchSig.size());
 }
 
 UniValue getreceivedbyaddress(const JSONRPCRequest& request)
@@ -634,13 +644,15 @@ UniValue getreceivedbyaddress(const JSONRPCRequest& request)
             + HelpExampleRpc("getreceivedbyaddress", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\", 6")
        );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     // Bitcoin address
-    CBitcoinAddress address = CBitcoinAddress(request.params[0].get_str());
-    if (!address.IsValid())
+    CTxDestination dest = DecodeDestination(request.params[0].get_str());
+    if (!IsValidDestination(dest)) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid Bitcoin address");
-    CScript scriptPubKey = GetScriptForDestination(address.Get());
+    }
+    CScript scriptPubKey = GetScriptForDestination(dest);
     if (!IsMine(*pwallet, scriptPubKey)) {
         return ValueFromAmount(0);
     }
@@ -694,6 +706,7 @@ UniValue getreceivedbyaccount(const JSONRPCRequest& request)
             + HelpExampleRpc("getreceivedbyaccount", "\"tabby\", 6")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     // Minimum confirmations
@@ -766,20 +779,34 @@ UniValue getbalance(const JSONRPCRequest& request)
             + HelpExampleRpc("getbalance", "\"*\", 6")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
-    if (request.params.size() == 0)
-        return  ValueFromAmount(pwallet->GetBalance());
+    const UniValue& account_value = request.params[0];
+    const UniValue& minconf = request.params[1];
+    const UniValue& include_watchonly = request.params[2];
+
+    if (account_value.isNull()) {
+        if (!minconf.isNull()) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER,
+                "getbalance minconf option is only currently supported if an account is specified");
+        }
+        if (!include_watchonly.isNull()) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER,
+                "getbalance include_watchonly option is only currently supported if an account is specified");
+        }
+        return ValueFromAmount(pwallet->GetBalance());
+    }
 
-    const std::string& account_param = request.params[0].get_str();
+    const std::string& account_param = account_value.get_str();
     const std::string* account = account_param != "*" ? &account_param : nullptr;
 
     int nMinDepth = 1;
-    if (!request.params[1].isNull())
-        nMinDepth = request.params[1].get_int();
+    if (!minconf.isNull())
+        nMinDepth = minconf.get_int();
     isminefilter filter = ISMINE_SPENDABLE;
-    if(!request.params[2].isNull())
-        if(request.params[2].get_bool())
+    if(!include_watchonly.isNull())
+        if(include_watchonly.get_bool())
             filter = filter | ISMINE_WATCH_ONLY;
 
     return ValueFromAmount(pwallet->GetLegacyBalance(filter, nMinDepth, account));
@@ -797,6 +824,7 @@ UniValue getunconfirmedbalance(const JSONRPCRequest &request)
                 "getunconfirmedbalance\n"
                 "Returns the server's total unconfirmed balance\n");
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     return ValueFromAmount(pwallet->GetUnconfirmedBalance());
@@ -831,6 +859,7 @@ UniValue movecmd(const JSONRPCRequest& request)
             + HelpExampleRpc("move", "\"timotei\", \"akiko\", 0.01, 6, \"happy birthday!\"")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     std::string strFrom = AccountFromValue(request.params[0]);
@@ -838,11 +867,11 @@ UniValue movecmd(const JSONRPCRequest& request)
     CAmount nAmount = AmountFromValue(request.params[2]);
     if (nAmount <= 0)
         throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount for send");
-    if (request.params.size() > 3)
+    if (!request.params[3].isNull())
         // unused parameter, used to be nMinDepth, keep type-checking it though
         (void)request.params[3].get_int();
     std::string strComment;
-    if (request.params.size() > 4)
+    if (!request.params[4].isNull())
         strComment = request.params[4].get_str();
 
     if (!pwallet->AccountMove(strFrom, strTo, nAmount, strComment)) {
@@ -889,24 +918,26 @@ UniValue sendfrom(const JSONRPCRequest& request)
             + HelpExampleRpc("sendfrom", "\"tabby\", \"1M72Sfpbz1BPpXFHz9m3CdqATR44Jvaydd\", 0.01, 6, \"donation\", \"seans outpost\"")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     std::string strAccount = AccountFromValue(request.params[0]);
-    CBitcoinAddress address(request.params[1].get_str());
-    if (!address.IsValid())
+    CTxDestination dest = DecodeDestination(request.params[1].get_str());
+    if (!IsValidDestination(dest)) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid Bitcoin address");
+    }
     CAmount nAmount = AmountFromValue(request.params[2]);
     if (nAmount <= 0)
         throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount for send");
     int nMinDepth = 1;
-    if (request.params.size() > 3)
+    if (!request.params[3].isNull())
         nMinDepth = request.params[3].get_int();
 
     CWalletTx wtx;
     wtx.strFromAccount = strAccount;
-    if (request.params.size() > 4 && !request.params[4].isNull() && !request.params[4].get_str().empty())
+    if (!request.params[4].isNull() && !request.params[4].get_str().empty())
         wtx.mapValue["comment"] = request.params[4].get_str();
-    if (request.params.size() > 5 && !request.params[5].isNull() && !request.params[5].get_str().empty())
+    if (!request.params[5].isNull() && !request.params[5].get_str().empty())
         wtx.mapValue["to"]      = request.params[5].get_str();
 
     EnsureWalletIsUnlocked(pwallet);
@@ -917,7 +948,7 @@ UniValue sendfrom(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, "Account has insufficient funds");
 
     CCoinControl no_coin_control; // This is a deprecated API
-    SendMoney(pwallet, address.Get(), nAmount, false, wtx, no_coin_control);
+    SendMoney(pwallet, dest, nAmount, false, wtx, no_coin_control);
 
     return wtx.GetHash().GetHex();
 }
@@ -972,6 +1003,7 @@ UniValue sendmany(const JSONRPCRequest& request)
             + HelpExampleRpc("sendmany", "\"\", \"{\\\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\\\":0.01,\\\"1353tsE8YMTA4EuV7dgUXGjNFf9KpVvKHz\\\":0.02}\", 6, \"testing\"")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     if (pwallet->GetBroadcastTransactions() && !g_connman) {
@@ -986,44 +1018,45 @@ UniValue sendmany(const JSONRPCRequest& request)
 
     CWalletTx wtx;
     wtx.strFromAccount = strAccount;
-    if (request.params.size() > 3 && !request.params[3].isNull() && !request.params[3].get_str().empty())
+    if (!request.params[3].isNull() && !request.params[3].get_str().empty())
         wtx.mapValue["comment"] = request.params[3].get_str();
 
     UniValue subtractFeeFromAmount(UniValue::VARR);
-    if (request.params.size() > 4 && !request.params[4].isNull())
+    if (!request.params[4].isNull())
         subtractFeeFromAmount = request.params[4].get_array();
 
     CCoinControl coin_control;
-    if (request.params.size() > 5 && !request.params[5].isNull()) {
+    if (!request.params[5].isNull()) {
         coin_control.signalRbf = request.params[5].get_bool();
     }
 
-    if (request.params.size() > 6 && !request.params[6].isNull()) {
+    if (!request.params[6].isNull()) {
         coin_control.m_confirm_target = ParseConfirmTarget(request.params[6]);
     }
 
-    if (request.params.size() > 7 && !request.params[7].isNull()) {
+    if (!request.params[7].isNull()) {
         if (!FeeModeFromString(request.params[7].get_str(), coin_control.m_fee_mode)) {
             throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid estimate_mode parameter");
         }
     }
 
-    std::set<CBitcoinAddress> setAddress;
+    std::set<CTxDestination> destinations;
     std::vector<CRecipient> vecSend;
 
     CAmount totalAmount = 0;
     std::vector<std::string> keys = sendTo.getKeys();
-    for (const std::string& name_ : keys)
-    {
-        CBitcoinAddress address(name_);
-        if (!address.IsValid())
-            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ")+name_);
+    for (const std::string& name_ : keys) {
+        CTxDestination dest = DecodeDestination(name_);
+        if (!IsValidDestination(dest)) {
+            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ") + name_);
+        }
 
-        if (setAddress.count(address))
-            throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ")+name_);
-        setAddress.insert(address);
+        if (destinations.count(dest)) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ") + name_);
+        }
+        destinations.insert(dest);
 
-        CScript scriptPubKey = GetScriptForDestination(address.Get());
+        CScript scriptPubKey = GetScriptForDestination(dest);
         CAmount nAmount = AmountFromValue(sendTo[name_]);
         if (nAmount <= 0)
             throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount for send");
@@ -1105,7 +1138,7 @@ UniValue addmultisigaddress(const JSONRPCRequest& request)
     LOCK2(cs_main, pwallet->cs_wallet);
 
     std::string strAccount;
-    if (request.params.size() > 2)
+    if (!request.params[2].isNull())
         strAccount = AccountFromValue(request.params[2]);
 
     // Construct using pay-to-script-hash:
@@ -1114,18 +1147,17 @@ UniValue addmultisigaddress(const JSONRPCRequest& request)
     pwallet->AddCScript(inner);
 
     pwallet->SetAddressBook(innerID, strAccount, "send");
-    return CBitcoinAddress(innerID).ToString();
+    return EncodeDestination(innerID);
 }
 
 class Witnessifier : public boost::static_visitor<bool>
 {
 public:
     CWallet * const pwallet;
-    CScriptID result;
-
-    Witnessifier(CWallet *_pwallet) : pwallet(_pwallet) {}
+    CTxDestination result;
+    bool already_witness;
 
-    bool operator()(const CNoDestination &dest) const { return false; }
+    explicit Witnessifier(CWallet *_pwallet) : pwallet(_pwallet), already_witness(false) {}
 
     bool operator()(const CKeyID &keyID) {
         if (pwallet) {
@@ -1134,14 +1166,12 @@ class Witnessifier : public boost::static_visitor<bool>
             SignatureData sigs;
             // This check is to make sure that the script we created can actually be solved for and signed by us
             // if we were to have the private keys. This is just to make sure that the script is valid and that,
-            // if found in a transaction, we would still accept and relay that transcation.
+            // if found in a transaction, we would still accept and relay that transaction.
             if (!ProduceSignature(DummySignatureCreator(pwallet), witscript, sigs) ||
                 !VerifyScript(sigs.scriptSig, witscript, &sigs.scriptWitness, MANDATORY_SCRIPT_VERIFY_FLAGS | SCRIPT_VERIFY_WITNESS_PUBKEYTYPE, DummySignatureCreator(pwallet).Checker())) {
                 return false;
             }
-            pwallet->AddCScript(witscript);
-            result = CScriptID(witscript);
-            return true;
+            return ExtractDestination(witscript, result);
         }
         return false;
     }
@@ -1152,24 +1182,40 @@ class Witnessifier : public boost::static_visitor<bool>
             int witnessversion;
             std::vector<unsigned char> witprog;
             if (subscript.IsWitnessProgram(witnessversion, witprog)) {
-                result = scriptID;
+                ExtractDestination(subscript, result);
+                already_witness = true;
                 return true;
             }
             CScript witscript = GetScriptForWitness(subscript);
             SignatureData sigs;
             // This check is to make sure that the script we created can actually be solved for and signed by us
             // if we were to have the private keys. This is just to make sure that the script is valid and that,
-            // if found in a transaction, we would still accept and relay that transcation.
+            // if found in a transaction, we would still accept and relay that transaction.
             if (!ProduceSignature(DummySignatureCreator(pwallet), witscript, sigs) ||
                 !VerifyScript(sigs.scriptSig, witscript, &sigs.scriptWitness, MANDATORY_SCRIPT_VERIFY_FLAGS | SCRIPT_VERIFY_WITNESS_PUBKEYTYPE, DummySignatureCreator(pwallet).Checker())) {
                 return false;
             }
-            pwallet->AddCScript(witscript);
-            result = CScriptID(witscript);
-            return true;
+            return ExtractDestination(witscript, result);
         }
         return false;
     }
+
+    bool operator()(const WitnessV0KeyHash& id)
+    {
+        already_witness = true;
+        result = id;
+        return true;
+    }
+
+    bool operator()(const WitnessV0ScriptHash& id)
+    {
+        already_witness = true;
+        result = id;
+        return true;
+    }
+
+    template<typename T>
+    bool operator()(const T& dest) { return false; }
 };
 
 UniValue addwitnessaddress(const JSONRPCRequest& request)
@@ -1179,17 +1225,18 @@ UniValue addwitnessaddress(const JSONRPCRequest& request)
         return NullUniValue;
     }
 
-    if (request.fHelp || request.params.size() < 1 || request.params.size() > 1)
+    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
     {
-        std::string msg = "addwitnessaddress \"address\"\n"
+        std::string msg = "addwitnessaddress \"address\" ( p2sh )\n"
             "\nAdd a witness address for a script (with pubkey or redeemscript known).\n"
             "It returns the witness script.\n"
 
             "\nArguments:\n"
             "1. \"address\"       (string, required) An address known to the wallet\n"
+            "2. p2sh            (bool, optional, default=true) Embed inside P2SH\n"
 
             "\nResult:\n"
-            "\"witnessaddress\",  (string) The value of the new address (P2SH of witness script).\n"
+            "\"witnessaddress\",  (string) The value of the new address (P2SH or BIP173).\n"
             "}\n"
         ;
         throw std::runtime_error(msg);
@@ -1197,25 +1244,43 @@ UniValue addwitnessaddress(const JSONRPCRequest& request)
 
     {
         LOCK(cs_main);
-        if (!IsWitnessEnabled(chainActive.Tip(), Params().GetConsensus()) && !GetBoolArg("-walletprematurewitness", false)) {
+        if (!IsWitnessEnabled(chainActive.Tip(), Params().GetConsensus()) && !gArgs.GetBoolArg("-walletprematurewitness", false)) {
             throw JSONRPCError(RPC_WALLET_ERROR, "Segregated witness not enabled on network");
         }
     }
 
-    CBitcoinAddress address(request.params[0].get_str());
-    if (!address.IsValid())
+    CTxDestination dest = DecodeDestination(request.params[0].get_str());
+    if (!IsValidDestination(dest)) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid Bitcoin address");
+    }
+
+    bool p2sh = true;
+    if (!request.params[1].isNull()) {
+        p2sh = request.params[1].get_bool();
+    }
 
     Witnessifier w(pwallet);
-    CTxDestination dest = address.Get();
     bool ret = boost::apply_visitor(w, dest);
     if (!ret) {
         throw JSONRPCError(RPC_WALLET_ERROR, "Public key or redeemscript not known to wallet, or the key is uncompressed");
     }
 
-    pwallet->SetAddressBook(w.result, "", "receive");
+    CScript witprogram = GetScriptForDestination(w.result);
+
+    if (p2sh) {
+        w.result = CScriptID(witprogram);
+    }
 
-    return CBitcoinAddress(w.result).ToString();
+    if (w.already_witness) {
+        if (!(dest == w.result)) {
+            throw JSONRPCError(RPC_WALLET_ERROR, "Cannot convert between witness address types");
+        }
+    } else {
+        pwallet->AddCScript(witprogram);
+        pwallet->SetAddressBook(w.result, "", "receive");
+    }
+
+    return EncodeDestination(w.result);
 }
 
 struct tallyitem
@@ -1250,7 +1315,7 @@ UniValue ListReceived(CWallet * const pwallet, const UniValue& params, bool fByA
             filter = filter | ISMINE_WATCH_ONLY;
 
     // Tally
-    std::map<CBitcoinAddress, tallyitem> mapTally;
+    std::map<CTxDestination, tallyitem> mapTally;
     for (const std::pair<uint256, CWalletTx>& pairWtx : pwallet->mapWallet) {
         const CWalletTx& wtx = pairWtx.second;
 
@@ -1283,10 +1348,10 @@ UniValue ListReceived(CWallet * const pwallet, const UniValue& params, bool fByA
     // Reply
     UniValue ret(UniValue::VARR);
     std::map<std::string, tallyitem> mapAccountTally;
-    for (const std::pair<CBitcoinAddress, CAddressBookData>& item : pwallet->mapAddressBook) {
-        const CBitcoinAddress& address = item.first;
+    for (const std::pair<CTxDestination, CAddressBookData>& item : pwallet->mapAddressBook) {
+        const CTxDestination& dest = item.first;
         const std::string& strAccount = item.second.name;
-        std::map<CBitcoinAddress, tallyitem>::iterator it = mapTally.find(address);
+        std::map<CTxDestination, tallyitem>::iterator it = mapTally.find(dest);
         if (it == mapTally.end() && !fIncludeEmpty)
             continue;
 
@@ -1312,7 +1377,7 @@ UniValue ListReceived(CWallet * const pwallet, const UniValue& params, bool fByA
             UniValue obj(UniValue::VOBJ);
             if(fIsWatchonly)
                 obj.push_back(Pair("involvesWatchonly", true));
-            obj.push_back(Pair("address",       address.ToString()));
+            obj.push_back(Pair("address",       EncodeDestination(dest)));
             obj.push_back(Pair("account",       strAccount));
             obj.push_back(Pair("amount",        ValueFromAmount(nAmount)));
             obj.push_back(Pair("confirmations", (nConf == std::numeric_limits<int>::max() ? 0 : nConf)));
@@ -1389,6 +1454,7 @@ UniValue listreceivedbyaddress(const JSONRPCRequest& request)
             + HelpExampleRpc("listreceivedbyaddress", "6, true, true")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     return ListReceived(pwallet, request.params, false);
@@ -1428,6 +1494,7 @@ UniValue listreceivedbyaccount(const JSONRPCRequest& request)
             + HelpExampleRpc("listreceivedbyaccount", "6, true, true")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     return ListReceived(pwallet, request.params, true);
@@ -1435,9 +1502,9 @@ UniValue listreceivedbyaccount(const JSONRPCRequest& request)
 
 static void MaybePushAddress(UniValue & entry, const CTxDestination &dest)
 {
-    CBitcoinAddress addr;
-    if (addr.Set(dest))
-        entry.push_back(Pair("address", addr.ToString()));
+    if (IsValidDestination(dest)) {
+        entry.push_back(Pair("address", EncodeDestination(dest)));
+    }
 }
 
 /**
@@ -1615,6 +1682,7 @@ UniValue listtransactions(const JSONRPCRequest& request)
             + HelpExampleRpc("listtransactions", "\"*\", 20, 100")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     std::string strAccount = "*";
@@ -1644,10 +1712,10 @@ UniValue listtransactions(const JSONRPCRequest& request)
     for (CWallet::TxItems::const_reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
     {
         CWalletTx *const pwtx = (*it).second.first;
-        if (pwtx != 0)
+        if (pwtx != nullptr)
             ListTransactions(pwallet, *pwtx, strAccount, 0, true, ret, filter);
         CAccountingEntry *const pacentry = (*it).second.second;
-        if (pacentry != 0)
+        if (pacentry != nullptr)
             AcentryToJSON(*pacentry, strAccount, ret);
 
         if ((int)ret.size() >= (nCount+nFrom)) break;
@@ -1708,13 +1776,14 @@ UniValue listaccounts(const JSONRPCRequest& request)
             + HelpExampleRpc("listaccounts", "6")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     int nMinDepth = 1;
-    if (request.params.size() > 0)
+    if (!request.params[0].isNull())
         nMinDepth = request.params[0].get_int();
     isminefilter includeWatchonly = ISMINE_SPENDABLE;
-    if(request.params.size() > 1)
+    if(!request.params[1].isNull())
         if(request.params[1].get_bool())
             includeWatchonly = includeWatchonly | ISMINE_WATCH_ONLY;
 
@@ -1816,10 +1885,11 @@ UniValue listsinceblock(const JSONRPCRequest& request)
             + HelpExampleRpc("listsinceblock", "\"000000000000000bacf66f7497b7dc45ef753ee9a7d38571037cdb1a57f663ad\", 6")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
-    const CBlockIndex* pindex = NULL;    // Block index of the specified block or the common ancestor, if the block provided was in a deactivated chain.
-    const CBlockIndex* paltindex = NULL; // Block index of the specified block, even if it's in a deactivated chain.
+    const CBlockIndex* pindex = nullptr;    // Block index of the specified block or the common ancestor, if the block provided was in a deactivated chain.
+    const CBlockIndex* paltindex = nullptr; // Block index of the specified block, even if it's in a deactivated chain.
     int target_confirms = 1;
     isminefilter filter = ISMINE_SPENDABLE;
 
@@ -1874,10 +1944,11 @@ UniValue listsinceblock(const JSONRPCRequest& request)
             throw JSONRPCError(RPC_INTERNAL_ERROR, "Can't read block from disk");
         }
         for (const CTransactionRef& tx : block.vtx) {
-            if (pwallet->mapWallet.count(tx->GetHash()) > 0) {
+            auto it = pwallet->mapWallet.find(tx->GetHash());
+            if (it != pwallet->mapWallet.end()) {
                 // We want all transactions regardless of confirmation count to appear here,
                 // even negative confirmation ones, hence the big negative.
-                ListTransactions(pwallet, pwallet->mapWallet[tx->GetHash()], "*", -100000000, true, removed, filter);
+                ListTransactions(pwallet, it->second, "*", -100000000, true, removed, filter);
             }
         }
         paltindex = paltindex->pprev;
@@ -1946,6 +2017,7 @@ UniValue gettransaction(const JSONRPCRequest& request)
             + HelpExampleRpc("gettransaction", "\"1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d\"")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     uint256 hash;
@@ -1957,10 +2029,11 @@ UniValue gettransaction(const JSONRPCRequest& request)
             filter = filter | ISMINE_WATCH_ONLY;
 
     UniValue entry(UniValue::VOBJ);
-    if (!pwallet->mapWallet.count(hash)) {
+    auto it = pwallet->mapWallet.find(hash);
+    if (it == pwallet->mapWallet.end()) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid or non-wallet transaction id");
     }
-    const CWalletTx& wtx = pwallet->mapWallet[hash];
+    const CWalletTx& wtx = it->second;
 
     CAmount nCredit = wtx.GetCredit(filter);
     CAmount nDebit = wtx.GetDebit(filter);
@@ -2006,6 +2079,7 @@ UniValue abandontransaction(const JSONRPCRequest& request)
             + HelpExampleRpc("abandontransaction", "\"1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d\"")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     uint256 hash;
@@ -2361,19 +2435,18 @@ UniValue lockunspent(const JSONRPCRequest& request)
 
     LOCK2(cs_main, pwallet->cs_wallet);
 
-    if (request.params.size() == 1)
-        RPCTypeCheck(request.params, {UniValue::VBOOL});
-    else
-        RPCTypeCheck(request.params, {UniValue::VBOOL, UniValue::VARR});
+    RPCTypeCheckArgument(request.params[0], UniValue::VBOOL);
 
     bool fUnlock = request.params[0].get_bool();
 
-    if (request.params.size() == 1) {
+    if (request.params[1].isNull()) {
         if (fUnlock)
             pwallet->UnlockAllCoins();
         return true;
     }
 
+    RPCTypeCheckArgument(request.params[1], UniValue::VARR);
+
     UniValue outputs = request.params[1].get_array();
     for (unsigned int idx = 0; idx < outputs.size(); idx++) {
         const UniValue& output = outputs[idx];
@@ -2439,6 +2512,7 @@ UniValue listlockunspent(const JSONRPCRequest& request)
             + HelpExampleRpc("listlockunspent", "")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     std::vector<COutPoint> vOutpts;
@@ -2517,6 +2591,7 @@ UniValue getwalletinfo(const JSONRPCRequest& request)
             + HelpExampleRpc("getwalletinfo", "")
         );
 
+    ObserveSafeMode();
     LOCK2(cs_main, pwallet->cs_wallet);
 
     UniValue obj(UniValue::VOBJ);
@@ -2669,35 +2744,38 @@ UniValue listunspent(const JSONRPCRequest& request)
             + HelpExampleRpc("listunspent", "6, 9999999, [] , true, { \"minimumAmount\": 0.005 } ")
         );
 
+    ObserveSafeMode();
+
     int nMinDepth = 1;
-    if (request.params.size() > 0 && !request.params[0].isNull()) {
+    if (!request.params[0].isNull()) {
         RPCTypeCheckArgument(request.params[0], UniValue::VNUM);
         nMinDepth = request.params[0].get_int();
     }
 
     int nMaxDepth = 9999999;
-    if (request.params.size() > 1 && !request.params[1].isNull()) {
+    if (!request.params[1].isNull()) {
         RPCTypeCheckArgument(request.params[1], UniValue::VNUM);
         nMaxDepth = request.params[1].get_int();
     }
 
-    std::set<CBitcoinAddress> setAddress;
-    if (request.params.size() > 2 && !request.params[2].isNull()) {
+    std::set<CTxDestination> destinations;
+    if (!request.params[2].isNull()) {
         RPCTypeCheckArgument(request.params[2], UniValue::VARR);
         UniValue inputs = request.params[2].get_array();
         for (unsigned int idx = 0; idx < inputs.size(); idx++) {
             const UniValue& input = inputs[idx];
-            CBitcoinAddress address(input.get_str());
-            if (!address.IsValid())
-                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ")+input.get_str());
-            if (setAddress.count(address))
-                throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ")+input.get_str());
-           setAddress.insert(address);
+            CTxDestination dest = DecodeDestination(input.get_str());
+            if (!IsValidDestination(dest)) {
+                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ") + input.get_str());
+            }
+            if (!destinations.insert(dest).second) {
+                throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ") + input.get_str());
+            }
         }
     }
 
     bool include_unsafe = true;
-    if (request.params.size() > 3 && !request.params[3].isNull()) {
+    if (!request.params[3].isNull()) {
         RPCTypeCheckArgument(request.params[3], UniValue::VBOOL);
         include_unsafe = request.params[3].get_bool();
     }
@@ -2725,16 +2803,16 @@ UniValue listunspent(const JSONRPCRequest& request)
 
     UniValue results(UniValue::VARR);
     std::vector<COutput> vecOutputs;
-    assert(pwallet != NULL);
+    assert(pwallet != nullptr);
     LOCK2(cs_main, pwallet->cs_wallet);
 
-    pwallet->AvailableCoins(vecOutputs, !include_unsafe, NULL, nMinimumAmount, nMaximumAmount, nMinimumSumAmount, nMaximumCount, nMinDepth, nMaxDepth);
+    pwallet->AvailableCoins(vecOutputs, !include_unsafe, nullptr, nMinimumAmount, nMaximumAmount, nMinimumSumAmount, nMaximumCount, nMinDepth, nMaxDepth);
     for (const COutput& out : vecOutputs) {
         CTxDestination address;
         const CScript& scriptPubKey = out.tx->tx->vout[out.i].scriptPubKey;
         bool fValidAddress = ExtractDestination(scriptPubKey, address);
 
-        if (setAddress.size() && (!fValidAddress || !setAddress.count(address)))
+        if (destinations.size() && (!fValidAddress || !destinations.count(address)))
             continue;
 
         UniValue entry(UniValue::VOBJ);
@@ -2742,7 +2820,7 @@ UniValue listunspent(const JSONRPCRequest& request)
         entry.push_back(Pair("vout", out.i));
 
         if (fValidAddress) {
-            entry.push_back(Pair("address", CBitcoinAddress(address).ToString()));
+            entry.push_back(Pair("address", EncodeDestination(address)));
 
             if (pwallet->mapAddressBook.count(address)) {
                 entry.push_back(Pair("account", pwallet->mapAddressBook[address].name));
@@ -2797,7 +2875,7 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
                             "     \"changePosition\"         (numeric, optional, default random) The index of the change output\n"
                             "     \"includeWatching\"        (boolean, optional, default false) Also select inputs which are watch only\n"
                             "     \"lockUnspents\"           (boolean, optional, default false) Lock selected unspent outputs\n"
-                            "     \"feeRate\"                (numeric, optional, default not set: makes wallet determine the fee) Set a specific feerate (" + CURRENCY_UNIT + " per KB)\n"
+                            "     \"feeRate\"                (numeric, optional, default not set: makes wallet determine the fee) Set a specific fee rate in " + CURRENCY_UNIT + "/kB\n"
                             "     \"subtractFeeFromOutputs\" (array, optional) A json array of integers.\n"
                             "                              The fee will be equally deducted from the amount of each specified output.\n"
                             "                              The outputs are specified by their zero-based index, before any change output is added.\n"
@@ -2830,6 +2908,7 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
                             + HelpExampleCli("sendrawtransaction", "\"signedtransactionhex\"")
                             );
 
+    ObserveSafeMode();
     RPCTypeCheck(request.params, {UniValue::VSTR});
 
     CCoinControl coinControl;
@@ -2864,12 +2943,13 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
             true, true);
 
         if (options.exists("changeAddress")) {
-            CBitcoinAddress address(options["changeAddress"].get_str());
+            CTxDestination dest = DecodeDestination(options["changeAddress"].get_str());
 
-            if (!address.IsValid())
+            if (!IsValidDestination(dest)) {
                 throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "changeAddress must be a valid bitcoin address");
+            }
 
-            coinControl.destChange = address.Get();
+            coinControl.destChange = dest;
         }
 
         if (options.exists("changePosition"))
@@ -3112,7 +3192,7 @@ UniValue generate(const JSONRPCRequest& request)
 
     int num_generate = request.params[0].get_int();
     uint64_t max_tries = 1000000;
-    if (request.params.size() > 1 && !request.params[1].isNull()) {
+    if (!request.params[1].isNull()) {
         max_tries = request.params[1].get_int();
     }
 
@@ -3132,6 +3212,81 @@ UniValue generate(const JSONRPCRequest& request)
     return generateBlocks(coinbase_script, num_generate, max_tries, true);
 }
 
+UniValue rescanblockchain(const JSONRPCRequest& request)
+{
+    CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
+    if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
+        return NullUniValue;
+    }
+
+    if (request.fHelp || request.params.size() > 2) {
+        throw std::runtime_error(
+            "rescanblockchain (\"start_height\") (\"stop_height\")\n"
+            "\nRescan the local blockchain for wallet related transactions.\n"
+            "\nArguments:\n"
+            "1. \"start_height\"    (numeric, optional) block height where the rescan should start\n"
+            "2. \"stop_height\"     (numeric, optional) the last block height that should be scanned\n"
+            "\nResult:\n"
+            "{\n"
+            "  \"start_height\"     (numeric) The block height where the rescan has started. If omitted, rescan started from the genesis block.\n"
+            "  \"stop_height\"      (numeric) The height of the last rescanned block. If omitted, rescan stopped at the chain tip.\n"
+            "}\n"
+            "\nExamples:\n"
+            + HelpExampleCli("rescanblockchain", "100000 120000")
+            + HelpExampleRpc("rescanblockchain", "100000, 120000")
+            );
+    }
+
+    LOCK2(cs_main, pwallet->cs_wallet);
+
+    CBlockIndex *pindexStart = chainActive.Genesis();
+    CBlockIndex *pindexStop = nullptr;
+    if (!request.params[0].isNull()) {
+        pindexStart = chainActive[request.params[0].get_int()];
+        if (!pindexStart) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid start_height");
+        }
+    }
+
+    if (!request.params[1].isNull()) {
+        pindexStop = chainActive[request.params[1].get_int()];
+        if (!pindexStop) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid stop_height");
+        }
+        else if (pindexStop->nHeight < pindexStart->nHeight) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER, "stop_height must be greater then start_height");
+        }
+    }
+
+    // We can't rescan beyond non-pruned blocks, stop and throw an error
+    if (fPruneMode) {
+        CBlockIndex *block = pindexStop ? pindexStop : chainActive.Tip();
+        while (block && block->nHeight >= pindexStart->nHeight) {
+            if (!(block->nStatus & BLOCK_HAVE_DATA)) {
+                throw JSONRPCError(RPC_MISC_ERROR, "Can't rescan beyond pruned data. Use RPC call getblockchaininfo to determine your pruned height.");
+            }
+            block = block->pprev;
+        }
+    }
+
+    CBlockIndex *stopBlock = pwallet->ScanForWalletTransactions(pindexStart, pindexStop, true);
+    if (!stopBlock) {
+        if (pwallet->IsAbortingRescan()) {
+            throw JSONRPCError(RPC_MISC_ERROR, "Rescan aborted.");
+        }
+        // if we got a nullptr returned, ScanForWalletTransactions did rescan up to the requested stopindex
+        stopBlock = pindexStop ? pindexStop : chainActive.Tip();
+    }
+    else {
+        throw JSONRPCError(RPC_MISC_ERROR, "Rescan failed. Potentially corrupted data files.");
+    }
+
+    UniValue response(UniValue::VOBJ);
+    response.pushKV("start_height", pindexStart->nHeight);
+    response.pushKV("stop_height", stopBlock->nHeight);
+    return response;
+}
+
 extern UniValue abortrescan(const JSONRPCRequest& request); // in rpcdump.cpp
 extern UniValue dumpprivkey(const JSONRPCRequest& request); // in rpcdump.cpp
 extern UniValue importprivkey(const JSONRPCRequest& request);
@@ -3142,69 +3297,68 @@ extern UniValue importwallet(const JSONRPCRequest& request);
 extern UniValue importprunedfunds(const JSONRPCRequest& request);
 extern UniValue removeprunedfunds(const JSONRPCRequest& request);
 extern UniValue importmulti(const JSONRPCRequest& request);
+extern UniValue rescanblockchain(const JSONRPCRequest& request);
 
 static const CRPCCommand commands[] =
-{ //  category              name                        actor (function)           okSafeMode
-    //  --------------------- ------------------------    -----------------------    ----------
-    { "rawtransactions",    "fundrawtransaction",       &fundrawtransaction,       false,  {"hexstring","options"} },
-    { "hidden",             "resendwallettransactions", &resendwallettransactions, true,   {} },
-    { "wallet",             "abandontransaction",       &abandontransaction,       false,  {"txid"} },
-    { "wallet",             "abortrescan",              &abortrescan,              false,  {} },
-    { "wallet",             "addmultisigaddress",       &addmultisigaddress,       true,   {"nrequired","keys","account"} },
-    { "wallet",             "addwitnessaddress",        &addwitnessaddress,        true,   {"address"} },
-    { "wallet",             "backupwallet",             &backupwallet,             true,   {"destination"} },
-    { "wallet",             "bumpfee",                  &bumpfee,                  true,   {"txid", "options"} },
-    { "wallet",             "dumpprivkey",              &dumpprivkey,              true,   {"address"}  },
-    { "wallet",             "dumpwallet",               &dumpwallet,               true,   {"filename"} },
-    { "wallet",             "encryptwallet",            &encryptwallet,            true,   {"passphrase"} },
-    { "wallet",             "getaccountaddress",        &getaccountaddress,        true,   {"account"} },
-    { "wallet",             "getaccount",               &getaccount,               true,   {"address"} },
-    { "wallet",             "getaddressesbyaccount",    &getaddressesbyaccount,    true,   {"account"} },
-    { "wallet",             "getbalance",               &getbalance,               false,  {"account","minconf","include_watchonly"} },
-    { "wallet",             "getnewaddress",            &getnewaddress,            true,   {"account"} },
-    { "wallet",             "getrawchangeaddress",      &getrawchangeaddress,      true,   {} },
-    { "wallet",             "getreceivedbyaccount",     &getreceivedbyaccount,     false,  {"account","minconf"} },
-    { "wallet",             "getreceivedbyaddress",     &getreceivedbyaddress,     false,  {"address","minconf"} },
-    { "wallet",             "gettransaction",           &gettransaction,           false,  {"txid","include_watchonly"} },
-    { "wallet",             "getunconfirmedbalance",    &getunconfirmedbalance,    false,  {} },
-    { "wallet",             "getwalletinfo",            &getwalletinfo,            false,  {} },
-    { "wallet",             "importmulti",              &importmulti,              true,   {"requests","options"} },
-    { "wallet",             "importprivkey",            &importprivkey,            true,   {"privkey","label","rescan"} },
-    { "wallet",             "importwallet",             &importwallet,             true,   {"filename"} },
-    { "wallet",             "importaddress",            &importaddress,            true,   {"address","label","rescan","p2sh"} },
-    { "wallet",             "importprunedfunds",        &importprunedfunds,        true,   {"rawtransaction","txoutproof"} },
-    { "wallet",             "importpubkey",             &importpubkey,             true,   {"pubkey","label","rescan"} },
-    { "wallet",             "keypoolrefill",            &keypoolrefill,            true,   {"newsize"} },
-    { "wallet",             "listaccounts",             &listaccounts,             false,  {"minconf","include_watchonly"} },
-    { "wallet",             "listaddressgroupings",     &listaddressgroupings,     false,  {} },
-    { "wallet",             "listlockunspent",          &listlockunspent,          false,  {} },
-    { "wallet",             "listreceivedbyaccount",    &listreceivedbyaccount,    false,  {"minconf","include_empty","include_watchonly"} },
-    { "wallet",             "listreceivedbyaddress",    &listreceivedbyaddress,    false,  {"minconf","include_empty","include_watchonly"} },
-    { "wallet",             "listsinceblock",           &listsinceblock,           false,  {"blockhash","target_confirmations","include_watchonly","include_removed"} },
-    { "wallet",             "listtransactions",         &listtransactions,         false,  {"account","count","skip","include_watchonly"} },
-    { "wallet",             "listunspent",              &listunspent,              false,  {"minconf","maxconf","addresses","include_unsafe","query_options"} },
-    { "wallet",             "listwallets",              &listwallets,              true,   {} },
-    { "wallet",             "lockunspent",              &lockunspent,              true,   {"unlock","transactions"} },
-    { "wallet",             "move",                     &movecmd,                  false,  {"fromaccount","toaccount","amount","minconf","comment"} },
-    { "wallet",             "sendfrom",                 &sendfrom,                 false,  {"fromaccount","toaddress","amount","minconf","comment","comment_to"} },
-    { "wallet",             "sendmany",                 &sendmany,                 false,  {"fromaccount","amounts","minconf","comment","subtractfeefrom","replaceable","conf_target","estimate_mode"} },
-    { "wallet",             "sendtoaddress",            &sendtoaddress,            false,  {"address","amount","comment","comment_to","subtractfeefromamount","replaceable","conf_target","estimate_mode"} },
-    { "wallet",             "setaccount",               &setaccount,               true,   {"address","account"} },
-    { "wallet",             "settxfee",                 &settxfee,                 true,   {"amount"} },
-    { "wallet",             "signmessage",              &signmessage,              true,   {"address","message"} },
-    { "wallet",             "walletlock",               &walletlock,               true,   {} },
-    { "wallet",             "walletpassphrasechange",   &walletpassphrasechange,   true,   {"oldpassphrase","newpassphrase"} },
-    { "wallet",             "walletpassphrase",         &walletpassphrase,         true,   {"passphrase","timeout"} },
-    { "wallet",             "removeprunedfunds",        &removeprunedfunds,        true,   {"txid"} },
-
-    { "generating",         "generate",                 &generate,                 true,   {"nblocks","maxtries"} },
+{ //  category              name                        actor (function)           argNames
+    //  --------------------- ------------------------    -----------------------  ----------
+    { "rawtransactions",    "fundrawtransaction",       &fundrawtransaction,       {"hexstring","options"} },
+    { "hidden",             "resendwallettransactions", &resendwallettransactions, {} },
+    { "wallet",             "abandontransaction",       &abandontransaction,       {"txid"} },
+    { "wallet",             "abortrescan",              &abortrescan,              {} },
+    { "wallet",             "addmultisigaddress",       &addmultisigaddress,       {"nrequired","keys","account"} },
+    { "wallet",             "addwitnessaddress",        &addwitnessaddress,        {"address","p2sh"} },
+    { "wallet",             "backupwallet",             &backupwallet,             {"destination"} },
+    { "wallet",             "bumpfee",                  &bumpfee,                  {"txid", "options"} },
+    { "wallet",             "dumpprivkey",              &dumpprivkey,              {"address"}  },
+    { "wallet",             "dumpwallet",               &dumpwallet,               {"filename"} },
+    { "wallet",             "encryptwallet",            &encryptwallet,            {"passphrase"} },
+    { "wallet",             "getaccountaddress",        &getaccountaddress,        {"account"} },
+    { "wallet",             "getaccount",               &getaccount,               {"address"} },
+    { "wallet",             "getaddressesbyaccount",    &getaddressesbyaccount,    {"account"} },
+    { "wallet",             "getbalance",               &getbalance,               {"account","minconf","include_watchonly"} },
+    { "wallet",             "getnewaddress",            &getnewaddress,            {"account"} },
+    { "wallet",             "getrawchangeaddress",      &getrawchangeaddress,      {} },
+    { "wallet",             "getreceivedbyaccount",     &getreceivedbyaccount,     {"account","minconf"} },
+    { "wallet",             "getreceivedbyaddress",     &getreceivedbyaddress,     {"address","minconf"} },
+    { "wallet",             "gettransaction",           &gettransaction,           {"txid","include_watchonly"} },
+    { "wallet",             "getunconfirmedbalance",    &getunconfirmedbalance,    {} },
+    { "wallet",             "getwalletinfo",            &getwalletinfo,            {} },
+    { "wallet",             "importmulti",              &importmulti,              {"requests","options"} },
+    { "wallet",             "importprivkey",            &importprivkey,            {"privkey","label","rescan"} },
+    { "wallet",             "importwallet",             &importwallet,             {"filename"} },
+    { "wallet",             "importaddress",            &importaddress,            {"address","label","rescan","p2sh"} },
+    { "wallet",             "importprunedfunds",        &importprunedfunds,        {"rawtransaction","txoutproof"} },
+    { "wallet",             "importpubkey",             &importpubkey,             {"pubkey","label","rescan"} },
+    { "wallet",             "keypoolrefill",            &keypoolrefill,            {"newsize"} },
+    { "wallet",             "listaccounts",             &listaccounts,             {"minconf","include_watchonly"} },
+    { "wallet",             "listaddressgroupings",     &listaddressgroupings,     {} },
+    { "wallet",             "listlockunspent",          &listlockunspent,          {} },
+    { "wallet",             "listreceivedbyaccount",    &listreceivedbyaccount,    {"minconf","include_empty","include_watchonly"} },
+    { "wallet",             "listreceivedbyaddress",    &listreceivedbyaddress,    {"minconf","include_empty","include_watchonly"} },
+    { "wallet",             "listsinceblock",           &listsinceblock,           {"blockhash","target_confirmations","include_watchonly","include_removed"} },
+    { "wallet",             "listtransactions",         &listtransactions,         {"account","count","skip","include_watchonly"} },
+    { "wallet",             "listunspent",              &listunspent,              {"minconf","maxconf","addresses","include_unsafe","query_options"} },
+    { "wallet",             "listwallets",              &listwallets,              {} },
+    { "wallet",             "lockunspent",              &lockunspent,              {"unlock","transactions"} },
+    { "wallet",             "move",                     &movecmd,                  {"fromaccount","toaccount","amount","minconf","comment"} },
+    { "wallet",             "sendfrom",                 &sendfrom,                 {"fromaccount","toaddress","amount","minconf","comment","comment_to"} },
+    { "wallet",             "sendmany",                 &sendmany,                 {"fromaccount","amounts","minconf","comment","subtractfeefrom","replaceable","conf_target","estimate_mode"} },
+    { "wallet",             "sendtoaddress",            &sendtoaddress,            {"address","amount","comment","comment_to","subtractfeefromamount","replaceable","conf_target","estimate_mode"} },
+    { "wallet",             "setaccount",               &setaccount,               {"address","account"} },
+    { "wallet",             "settxfee",                 &settxfee,                 {"amount"} },
+    { "wallet",             "signmessage",              &signmessage,              {"address","message"} },
+    { "wallet",             "walletlock",               &walletlock,               {} },
+    { "wallet",             "walletpassphrasechange",   &walletpassphrasechange,   {"oldpassphrase","newpassphrase"} },
+    { "wallet",             "walletpassphrase",         &walletpassphrase,         {"passphrase","timeout"} },
+    { "wallet",             "removeprunedfunds",        &removeprunedfunds,        {"txid"} },
+    { "wallet",             "rescanblockchain",         &rescanblockchain,         {"start_height", "stop_height"} },
+
+    { "generating",         "generate",                 &generate,                 {"nblocks","maxtries"} },
 };
 
 void RegisterWalletRPCCommands(CRPCTable &t)
 {
-    if (GetBoolArg("-disablewallet", false))
-        return;
-
     for (unsigned int vcidx = 0; vcidx < ARRAYLEN(commands); vcidx++)
         t.appendCommand(commands[vcidx].name, &commands[vcidx]);
 }
diff --git a/src/wallet/rpcwallet.h b/src/wallet/rpcwallet.h
index 31e2f6a69..14e51610d 100644
--- a/src/wallet/rpcwallet.h
+++ b/src/wallet/rpcwallet.h
@@ -5,7 +5,10 @@
 #ifndef BITCOIN_WALLET_RPCWALLET_H
 #define BITCOIN_WALLET_RPCWALLET_H
 
+#include <string>
+
 class CRPCTable;
+class CWallet;
 class JSONRPCRequest;
 
 void RegisterWalletRPCCommands(CRPCTable &t);
@@ -14,7 +17,7 @@ void RegisterWalletRPCCommands(CRPCTable &t);
  * Figures out what wallet, if any, to use for a JSONRPCRequest.
  *
  * @param[in] request JSONRPCRequest that wishes to access a wallet
- * @return NULL if no wallet should be used, or a pointer to the CWallet
+ * @return nullptr if no wallet should be used, or a pointer to the CWallet
  */
 CWallet *GetWalletForJSONRPCRequest(const JSONRPCRequest& request);
 
diff --git a/src/wallet/test/crypto_tests.cpp b/src/wallet/test/crypto_tests.cpp
index 744063624..f4dabc50c 100644
--- a/src/wallet/test/crypto_tests.cpp
+++ b/src/wallet/test/crypto_tests.cpp
@@ -9,86 +9,9 @@
 #include <vector>
 
 #include <boost/test/unit_test.hpp>
-#include <openssl/aes.h>
-#include <openssl/evp.h>
 
 BOOST_FIXTURE_TEST_SUITE(wallet_crypto, BasicTestingSetup)
 
-bool OldSetKeyFromPassphrase(const SecureString& strKeyData, const std::vector<unsigned char>& chSalt, const unsigned int nRounds, const unsigned int nDerivationMethod, unsigned char* chKey, unsigned char* chIV)
-{
-    if (nRounds < 1 || chSalt.size() != WALLET_CRYPTO_SALT_SIZE)
-        return false;
-
-    int i = 0;
-    if (nDerivationMethod == 0)
-        i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha512(), &chSalt[0],
-                          (unsigned char *)&strKeyData[0], strKeyData.size(), nRounds, chKey, chIV);
-
-    if (i != (int)WALLET_CRYPTO_KEY_SIZE)
-    {
-        memory_cleanse(chKey, WALLET_CRYPTO_KEY_SIZE);
-        memory_cleanse(chIV, WALLET_CRYPTO_IV_SIZE);
-        return false;
-    }
-    return true;
-}
-
-bool OldEncrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned char> &vchCiphertext, const unsigned char chKey[32], const unsigned char chIV[16])
-{
-    // max ciphertext len for a n bytes of plaintext is
-    // n + AES_BLOCK_SIZE - 1 bytes
-    int nLen = vchPlaintext.size();
-    int nCLen = nLen + AES_BLOCK_SIZE, nFLen = 0;
-    vchCiphertext = std::vector<unsigned char> (nCLen);
-
-    EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
-
-    if (!ctx) return false;
-
-    bool fOk = true;
-
-    EVP_CIPHER_CTX_init(ctx);
-    if (fOk) fOk = EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, chKey, chIV) != 0;
-    if (fOk) fOk = EVP_EncryptUpdate(ctx, &vchCiphertext[0], &nCLen, &vchPlaintext[0], nLen) != 0;
-    if (fOk) fOk = EVP_EncryptFinal_ex(ctx, (&vchCiphertext[0]) + nCLen, &nFLen) != 0;
-    EVP_CIPHER_CTX_cleanup(ctx);
-
-    EVP_CIPHER_CTX_free(ctx);
-
-    if (!fOk) return false;
-
-    vchCiphertext.resize(nCLen + nFLen);
-    return true;
-}
-
-bool OldDecrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext, const unsigned char chKey[32], const unsigned char chIV[16])
-{
-    // plaintext will always be equal to or lesser than length of ciphertext
-    int nLen = vchCiphertext.size();
-    int nPLen = nLen, nFLen = 0;
-
-    vchPlaintext = CKeyingMaterial(nPLen);
-
-    EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
-
-    if (!ctx) return false;
-
-    bool fOk = true;
-
-    EVP_CIPHER_CTX_init(ctx);
-    if (fOk) fOk = EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, chKey, chIV) != 0;
-    if (fOk) fOk = EVP_DecryptUpdate(ctx, &vchPlaintext[0], &nPLen, &vchCiphertext[0], nLen) != 0;
-    if (fOk) fOk = EVP_DecryptFinal_ex(ctx, (&vchPlaintext[0]) + nPLen, &nFLen) != 0;
-    EVP_CIPHER_CTX_cleanup(ctx);
-
-    EVP_CIPHER_CTX_free(ctx);
-
-    if (!fOk) return false;
-
-    vchPlaintext.resize(nPLen + nFLen);
-    return true;
-}
-
 class TestCrypter
 {
 public:
@@ -96,25 +19,15 @@ static void TestPassphraseSingle(const std::vector<unsigned char>& vchSalt, cons
                  const std::vector<unsigned char>& correctKey = std::vector<unsigned char>(),
                  const std::vector<unsigned char>& correctIV=std::vector<unsigned char>())
 {
-    unsigned char chKey[WALLET_CRYPTO_KEY_SIZE];
-    unsigned char chIV[WALLET_CRYPTO_IV_SIZE];
-
     CCrypter crypt;
     crypt.SetKeyFromPassphrase(passphrase, vchSalt, rounds, 0);
 
-    OldSetKeyFromPassphrase(passphrase, vchSalt, rounds, 0, chKey, chIV);
-
-    BOOST_CHECK_MESSAGE(memcmp(chKey, crypt.vchKey.data(), crypt.vchKey.size()) == 0, \
-        HexStr(chKey, chKey+sizeof(chKey)) + std::string(" != ") + HexStr(crypt.vchKey));
-    BOOST_CHECK_MESSAGE(memcmp(chIV, crypt.vchIV.data(), crypt.vchIV.size()) == 0, \
-        HexStr(chIV, chIV+sizeof(chIV)) + std::string(" != ") + HexStr(crypt.vchIV));
-
     if(!correctKey.empty())
-        BOOST_CHECK_MESSAGE(memcmp(chKey, &correctKey[0], sizeof(chKey)) == 0, \
-            HexStr(chKey, chKey+sizeof(chKey)) + std::string(" != ") + HexStr(correctKey.begin(), correctKey.end()));
+        BOOST_CHECK_MESSAGE(memcmp(crypt.vchKey.data(), correctKey.data(), crypt.vchKey.size()) == 0, \
+            HexStr(crypt.vchKey.begin(), crypt.vchKey.end()) + std::string(" != ") + HexStr(correctKey.begin(), correctKey.end()));
     if(!correctIV.empty())
-        BOOST_CHECK_MESSAGE(memcmp(chIV, &correctIV[0], sizeof(chIV)) == 0,
-            HexStr(chIV, chIV+sizeof(chIV)) + std::string(" != ") + HexStr(correctIV.begin(), correctIV.end()));
+        BOOST_CHECK_MESSAGE(memcmp(crypt.vchIV.data(), correctIV.data(), crypt.vchIV.size()) == 0,
+            HexStr(crypt.vchIV.begin(), crypt.vchIV.end()) + std::string(" != ") + HexStr(correctIV.begin(), correctIV.end()));
 }
 
 static void TestPassphrase(const std::vector<unsigned char>& vchSalt, const SecureString& passphrase, uint32_t rounds,
@@ -126,50 +39,26 @@ static void TestPassphrase(const std::vector<unsigned char>& vchSalt, const Secu
         TestPassphraseSingle(vchSalt, SecureString(i, passphrase.end()), rounds);
 }
 
-
 static void TestDecrypt(const CCrypter& crypt, const std::vector<unsigned char>& vchCiphertext, \
                         const std::vector<unsigned char>& vchPlaintext = std::vector<unsigned char>())
 {
-    CKeyingMaterial vchDecrypted1;
-    CKeyingMaterial vchDecrypted2;
-    int result1, result2;
-    result1 = crypt.Decrypt(vchCiphertext, vchDecrypted1);
-    result2 = OldDecrypt(vchCiphertext, vchDecrypted2, crypt.vchKey.data(), crypt.vchIV.data());
-    BOOST_CHECK(result1 == result2);
-
-    // These two should be equal. However, OpenSSL 1.0.1j introduced a change
-    // that would zero all padding except for the last byte for failed decrypts.
-    // This behavior was reverted for 1.0.1k.
-    if (vchDecrypted1 != vchDecrypted2 && vchDecrypted1.size() >= AES_BLOCK_SIZE && SSLeay() == 0x100010afL)
-    {
-        for(CKeyingMaterial::iterator it = vchDecrypted1.end() - AES_BLOCK_SIZE; it != vchDecrypted1.end() - 1; it++)
-            *it = 0;
-    }
-
-    BOOST_CHECK_MESSAGE(vchDecrypted1 == vchDecrypted2, HexStr(vchDecrypted1.begin(), vchDecrypted1.end()) + " != " + HexStr(vchDecrypted2.begin(), vchDecrypted2.end()));
-
+    CKeyingMaterial vchDecrypted;
+    crypt.Decrypt(vchCiphertext, vchDecrypted);
     if (vchPlaintext.size())
-        BOOST_CHECK(CKeyingMaterial(vchPlaintext.begin(), vchPlaintext.end()) == vchDecrypted2);
+        BOOST_CHECK(CKeyingMaterial(vchPlaintext.begin(), vchPlaintext.end()) == vchDecrypted);
 }
 
 static void TestEncryptSingle(const CCrypter& crypt, const CKeyingMaterial& vchPlaintext,
                        const std::vector<unsigned char>& vchCiphertextCorrect = std::vector<unsigned char>())
 {
-    std::vector<unsigned char> vchCiphertext1;
-    std::vector<unsigned char> vchCiphertext2;
-    int result1 = crypt.Encrypt(vchPlaintext, vchCiphertext1);
-
-    int result2 = OldEncrypt(vchPlaintext, vchCiphertext2, crypt.vchKey.data(), crypt.vchIV.data());
-    BOOST_CHECK(result1 == result2);
-    BOOST_CHECK(vchCiphertext1 == vchCiphertext2);
+    std::vector<unsigned char> vchCiphertext;
+    crypt.Encrypt(vchPlaintext, vchCiphertext);
 
     if (!vchCiphertextCorrect.empty())
-        BOOST_CHECK(vchCiphertext2 == vchCiphertextCorrect);
+        BOOST_CHECK(vchCiphertext == vchCiphertextCorrect);
 
     const std::vector<unsigned char> vchPlaintext2(vchPlaintext.begin(), vchPlaintext.end());
-
-    if(vchCiphertext1 == vchCiphertext2)
-        TestDecrypt(crypt, vchCiphertext1, vchPlaintext2);
+    TestDecrypt(crypt, vchCiphertext, vchPlaintext2);
 }
 
 static void TestEncrypt(const CCrypter& crypt, const std::vector<unsigned char>& vchPlaintextIn, \
@@ -191,7 +80,7 @@ BOOST_AUTO_TEST_CASE(passphrase) {
 
     std::string hash(GetRandHash().ToString());
     std::vector<unsigned char> vchSalt(8);
-    GetRandBytes(&vchSalt[0], vchSalt.size());
+    GetRandBytes(vchSalt.data(), vchSalt.size());
     uint32_t rounds = InsecureRand32();
     if (rounds > 30000)
         rounds = 30000;
diff --git a/src/wallet/test/wallet_test_fixture.cpp b/src/wallet/test/wallet_test_fixture.cpp
index 922fcc8e8..e2f48c45a 100644
--- a/src/wallet/test/wallet_test_fixture.cpp
+++ b/src/wallet/test/wallet_test_fixture.cpp
@@ -28,7 +28,7 @@ WalletTestingSetup::~WalletTestingSetup()
 {
     UnregisterValidationInterface(pwalletMain);
     delete pwalletMain;
-    pwalletMain = NULL;
+    pwalletMain = nullptr;
 
     bitdb.Flush(true);
     bitdb.Reset();
diff --git a/src/wallet/test/wallet_test_fixture.h b/src/wallet/test/wallet_test_fixture.h
index 97a6d9839..9373b7907 100644
--- a/src/wallet/test/wallet_test_fixture.h
+++ b/src/wallet/test/wallet_test_fixture.h
@@ -10,7 +10,7 @@
 /** Testing setup and teardown for wallet.
  */
 struct WalletTestingSetup: public TestingSetup {
-    WalletTestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
+    explicit WalletTestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
     ~WalletTestingSetup();
 };
 
diff --git a/src/wallet/test/wallet_tests.cpp b/src/wallet/test/wallet_tests.cpp
index 4a2cc9a13..2b12168c6 100644
--- a/src/wallet/test/wallet_tests.cpp
+++ b/src/wallet/test/wallet_tests.cpp
@@ -364,6 +364,12 @@ BOOST_AUTO_TEST_CASE(ApproximateBestSubset)
     empty_wallet();
 }
 
+static void AddKey(CWallet& wallet, const CKey& key)
+{
+    LOCK(wallet.cs_wallet);
+    wallet.AddKeyPubKey(key, key.GetPubKey());
+}
+
 BOOST_FIXTURE_TEST_CASE(rescan, TestChain100Setup)
 {
     LOCK(cs_main);
@@ -379,9 +385,8 @@ BOOST_FIXTURE_TEST_CASE(rescan, TestChain100Setup)
     // and new block files.
     {
         CWallet wallet;
-        LOCK(wallet.cs_wallet);
-        wallet.AddKeyPubKey(coinbaseKey, coinbaseKey.GetPubKey());
-        BOOST_CHECK_EQUAL(nullBlock, wallet.ScanForWalletTransactions(oldTip));
+        AddKey(wallet, coinbaseKey);
+        BOOST_CHECK_EQUAL(nullBlock, wallet.ScanForWalletTransactions(oldTip, nullptr));
         BOOST_CHECK_EQUAL(wallet.GetImmatureBalance(), 100 * COIN);
     }
 
@@ -393,9 +398,8 @@ BOOST_FIXTURE_TEST_CASE(rescan, TestChain100Setup)
     // file.
     {
         CWallet wallet;
-        LOCK(wallet.cs_wallet);
-        wallet.AddKeyPubKey(coinbaseKey, coinbaseKey.GetPubKey());
-        BOOST_CHECK_EQUAL(oldTip, wallet.ScanForWalletTransactions(oldTip));
+        AddKey(wallet, coinbaseKey);
+        BOOST_CHECK_EQUAL(oldTip, wallet.ScanForWalletTransactions(oldTip, nullptr));
         BOOST_CHECK_EQUAL(wallet.GetImmatureBalance(), 50 * COIN);
     }
 
@@ -599,9 +603,8 @@ class ListCoinsTestingSetup : public TestChain100Setup
         wallet.reset(new CWallet(std::unique_ptr<CWalletDBWrapper>(new CWalletDBWrapper(&bitdb, "wallet_test.dat"))));
         bool firstRun;
         wallet->LoadWallet(firstRun);
-        LOCK(wallet->cs_wallet);
-        wallet->AddKeyPubKey(coinbaseKey, coinbaseKey.GetPubKey());
-        wallet->ScanForWalletTransactions(chainActive.Genesis());
+        AddKey(*wallet, coinbaseKey);
+        wallet->ScanForWalletTransactions(chainActive.Genesis(), nullptr);
     }
 
     ~ListCoinsTestingSetup()
@@ -635,7 +638,7 @@ class ListCoinsTestingSetup : public TestChain100Setup
 BOOST_FIXTURE_TEST_CASE(ListCoins, ListCoinsTestingSetup)
 {
     std::string coinbaseAddress = coinbaseKey.GetPubKey().GetID().ToString();
-    LOCK(wallet->cs_wallet);
+    LOCK2(cs_main, wallet->cs_wallet);
 
     // Confirm ListCoins initially returns 1 coin grouped under coinbaseKey
     // address.
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 4ddd9f95b..346715e41 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -12,6 +12,7 @@
 #include "consensus/consensus.h"
 #include "consensus/validation.h"
 #include "fs.h"
+#include "init.h"
 #include "key.h"
 #include "keystore.h"
 #include "validation.h"
@@ -29,6 +30,7 @@
 #include "util.h"
 #include "ui_interface.h"
 #include "utilmoneystr.h"
+#include "wallet/fees.h"
 
 #include <assert.h>
 
@@ -80,12 +82,63 @@ std::string COutput::ToString() const
     return strprintf("COutput(%s, %d, %d) [%s]", tx->GetHash().ToString(), i, nDepth, FormatMoney(tx->tx->vout[i].nValue));
 }
 
+class CAffectedKeysVisitor : public boost::static_visitor<void> {
+private:
+    const CKeyStore &keystore;
+    std::vector<CKeyID> &vKeys;
+
+public:
+    CAffectedKeysVisitor(const CKeyStore &keystoreIn, std::vector<CKeyID> &vKeysIn) : keystore(keystoreIn), vKeys(vKeysIn) {}
+
+    void Process(const CScript &script) {
+        txnouttype type;
+        std::vector<CTxDestination> vDest;
+        int nRequired;
+        if (ExtractDestinations(script, type, vDest, nRequired)) {
+            for (const CTxDestination &dest : vDest)
+                boost::apply_visitor(*this, dest);
+        }
+    }
+
+    void operator()(const CKeyID &keyId) {
+        if (keystore.HaveKey(keyId))
+            vKeys.push_back(keyId);
+    }
+
+    void operator()(const CScriptID &scriptId) {
+        CScript script;
+        if (keystore.GetCScript(scriptId, script))
+            Process(script);
+    }
+
+    void operator()(const WitnessV0ScriptHash& scriptID)
+    {
+        CScriptID id;
+        CRIPEMD160().Write(scriptID.begin(), 32).Finalize(id.begin());
+        CScript script;
+        if (keystore.GetCScript(id, script)) {
+            Process(script);
+        }
+    }
+
+    void operator()(const WitnessV0KeyHash& keyid)
+    {
+        CKeyID id(keyid);
+        if (keystore.HaveKey(id)) {
+            vKeys.push_back(id);
+        }
+    }
+
+    template<typename X>
+    void operator()(const X &none) {}
+};
+
 const CWalletTx* CWallet::GetWalletTx(const uint256& hash) const
 {
     LOCK(cs_wallet);
     std::map<uint256, CWalletTx>::const_iterator it = mapWallet.find(hash);
     if (it == mapWallet.end())
-        return NULL;
+        return nullptr;
     return &(it->second);
 }
 
@@ -182,10 +235,10 @@ bool CWallet::AddKeyPubKeyWithDB(CWalletDB &walletdb, const CKey& secret, const
         pwalletdbEncryption = &walletdb;
     }
     if (!CCryptoKeyStore::AddKeyPubKey(secret, pubkey)) {
-        if (needsDB) pwalletdbEncryption = NULL;
+        if (needsDB) pwalletdbEncryption = nullptr;
         return false;
     }
-    if (needsDB) pwalletdbEncryption = NULL;
+    if (needsDB) pwalletdbEncryption = nullptr;
 
     // check if we need to remove from watch-only
     CScript script;
@@ -273,7 +326,7 @@ bool CWallet::LoadCScript(const CScript& redeemScript)
      * these. Do not add them to the wallet and warn. */
     if (redeemScript.size() > MAX_SCRIPT_ELEMENT_SIZE)
     {
-        std::string strAddr = CBitcoinAddress(CScriptID(redeemScript)).ToString();
+        std::string strAddr = EncodeDestination(CScriptID(redeemScript));
         LogPrintf("%s: Warning: This wallet contains a redeemScript of size %i which exceeds maximum size %i thus can never be redeemed. Do not use address %s.\n",
             __func__, redeemScript.size(), MAX_SCRIPT_ELEMENT_SIZE, strAddr);
         return true;
@@ -356,11 +409,11 @@ bool CWallet::ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase,
             {
                 int64_t nStartTime = GetTimeMillis();
                 crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod);
-                pMasterKey.second.nDeriveIterations = pMasterKey.second.nDeriveIterations * (100 / ((double)(GetTimeMillis() - nStartTime)));
+                pMasterKey.second.nDeriveIterations = static_cast<unsigned int>(pMasterKey.second.nDeriveIterations * (100 / ((double)(GetTimeMillis() - nStartTime))));
 
                 nStartTime = GetTimeMillis();
                 crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod);
-                pMasterKey.second.nDeriveIterations = (pMasterKey.second.nDeriveIterations + pMasterKey.second.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime))) / 2;
+                pMasterKey.second.nDeriveIterations = (pMasterKey.second.nDeriveIterations + static_cast<unsigned int>(pMasterKey.second.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime)))) / 2;
 
                 if (pMasterKey.second.nDeriveIterations < 25000)
                     pMasterKey.second.nDeriveIterations = 25000;
@@ -461,63 +514,6 @@ void CWallet::Flush(bool shutdown)
     dbw->Flush(shutdown);
 }
 
-bool CWallet::Verify()
-{
-    if (GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET))
-        return true;
-
-    uiInterface.InitMessage(_("Verifying wallet(s)..."));
-
-    // Keep track of each wallet absolute path to detect duplicates.
-    std::set<fs::path> wallet_paths;
-
-    for (const std::string& walletFile : gArgs.GetArgs("-wallet")) {
-        if (boost::filesystem::path(walletFile).filename() != walletFile) {
-            return InitError(strprintf(_("Error loading wallet %s. -wallet parameter must only specify a filename (not a path)."), walletFile));
-        }
-
-        if (SanitizeString(walletFile, SAFE_CHARS_FILENAME) != walletFile) {
-            return InitError(strprintf(_("Error loading wallet %s. Invalid characters in -wallet filename."), walletFile));
-        }
-
-        fs::path wallet_path = fs::absolute(walletFile, GetDataDir());
-
-        if (fs::exists(wallet_path) && (!fs::is_regular_file(wallet_path) || fs::is_symlink(wallet_path))) {
-            return InitError(strprintf(_("Error loading wallet %s. -wallet filename must be a regular file."), walletFile));
-        }
-
-        if (!wallet_paths.insert(wallet_path).second) {
-            return InitError(strprintf(_("Error loading wallet %s. Duplicate -wallet filename specified."), walletFile));
-        }
-
-        std::string strError;
-        if (!CWalletDB::VerifyEnvironment(walletFile, GetDataDir().string(), strError)) {
-            return InitError(strError);
-        }
-
-        if (GetBoolArg("-salvagewallet", false)) {
-            // Recover readable keypairs:
-            CWallet dummyWallet;
-            std::string backup_filename;
-            if (!CWalletDB::Recover(walletFile, (void *)&dummyWallet, CWalletDB::RecoverKeysOnlyFilter, backup_filename)) {
-                return false;
-            }
-        }
-
-        std::string strWarning;
-        bool dbV = CWalletDB::VerifyDatabaseFile(walletFile, GetDataDir().string(), strWarning, strError);
-        if (!strWarning.empty()) {
-            InitWarning(strWarning);
-        }
-        if (!dbV) {
-            InitError(strError);
-            return false;
-        }
-    }
-
-    return true;
-}
-
 void CWallet::SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator> range)
 {
     // We want all the wallet transactions in range to have the same metadata as
@@ -525,7 +521,7 @@ void CWallet::SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator> ran
     // So: find smallest nOrderPos:
 
     int nMinOrderPos = std::numeric_limits<int>::max();
-    const CWalletTx* copyFrom = NULL;
+    const CWalletTx* copyFrom = nullptr;
     for (TxSpends::iterator it = range.first; it != range.second; ++it)
     {
         const uint256& hash = it->second;
@@ -542,6 +538,7 @@ void CWallet::SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator> ran
         const uint256& hash = it->second;
         CWalletTx* copyTo = &mapWallet[hash];
         if (copyFrom == copyTo) continue;
+        assert(copyFrom && "Oldest wallet transaction in range assumed to have been found.");
         if (!copyFrom->IsEquivalentTo(*copyTo)) continue;
         copyTo->mapValue = copyFrom->mapValue;
         copyTo->vOrderForm = copyFrom->vOrderForm;
@@ -590,8 +587,9 @@ void CWallet::AddToSpends(const COutPoint& outpoint, const uint256& wtxid)
 
 void CWallet::AddToSpends(const uint256& wtxid)
 {
-    assert(mapWallet.count(wtxid));
-    CWalletTx& thisTx = mapWallet[wtxid];
+    auto it = mapWallet.find(wtxid);
+    assert(it != mapWallet.end());
+    CWalletTx& thisTx = it->second;
     if (thisTx.IsCoinBase()) // Coinbases don't spend anything!
         return;
 
@@ -617,11 +615,11 @@ bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
     CCrypter crypter;
     int64_t nStartTime = GetTimeMillis();
     crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, 25000, kMasterKey.nDerivationMethod);
-    kMasterKey.nDeriveIterations = 2500000 / ((double)(GetTimeMillis() - nStartTime));
+    kMasterKey.nDeriveIterations = static_cast<unsigned int>(2500000 / ((double)(GetTimeMillis() - nStartTime)));
 
     nStartTime = GetTimeMillis();
     crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod);
-    kMasterKey.nDeriveIterations = (kMasterKey.nDeriveIterations + kMasterKey.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime))) / 2;
+    kMasterKey.nDeriveIterations = (kMasterKey.nDeriveIterations + static_cast<unsigned int>(kMasterKey.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime)))) / 2;
 
     if (kMasterKey.nDeriveIterations < 25000)
         kMasterKey.nDeriveIterations = 25000;
@@ -640,7 +638,7 @@ bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
         pwalletdbEncryption = new CWalletDB(*dbw);
         if (!pwalletdbEncryption->TxnBegin()) {
             delete pwalletdbEncryption;
-            pwalletdbEncryption = NULL;
+            pwalletdbEncryption = nullptr;
             return false;
         }
         pwalletdbEncryption->WriteMasterKey(nMasterKeyMaxID, kMasterKey);
@@ -665,7 +663,7 @@ bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
         }
 
         delete pwalletdbEncryption;
-        pwalletdbEncryption = NULL;
+        pwalletdbEncryption = nullptr;
 
         Lock();
         Unlock(strWalletPassphrase);
@@ -706,13 +704,13 @@ DBErrors CWallet::ReorderTransactions()
     for (std::map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
     {
         CWalletTx* wtx = &((*it).second);
-        txByTime.insert(std::make_pair(wtx->nTimeReceived, TxPair(wtx, (CAccountingEntry*)0)));
+        txByTime.insert(std::make_pair(wtx->nTimeReceived, TxPair(wtx, nullptr)));
     }
     std::list<CAccountingEntry> acentries;
     walletdb.ListAccountCreditDebit("", acentries);
     for (CAccountingEntry& entry : acentries)
     {
-        txByTime.insert(std::make_pair(entry.nTime, TxPair((CWalletTx*)0, &entry)));
+        txByTime.insert(std::make_pair(entry.nTime, TxPair(nullptr, &entry)));
     }
 
     nOrderPosNext = 0;
@@ -721,7 +719,7 @@ DBErrors CWallet::ReorderTransactions()
     {
         CWalletTx *const pwtx = (*it).second.first;
         CAccountingEntry *const pacentry = (*it).second.second;
-        int64_t& nOrderPos = (pwtx != 0) ? pwtx->nOrderPos : pacentry->nOrderPos;
+        int64_t& nOrderPos = (pwtx != nullptr) ? pwtx->nOrderPos : pacentry->nOrderPos;
 
         if (nOrderPos == -1)
         {
@@ -906,7 +904,7 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose)
     {
         wtx.nTimeReceived = GetAdjustedTime();
         wtx.nOrderPos = IncOrderPosNext(&walletdb);
-        wtxOrdered.insert(std::make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry*)0)));
+        wtxOrdered.insert(std::make_pair(wtx.nOrderPos, TxPair(&wtx, nullptr)));
         wtx.nTimeSmart = ComputeTimeSmart(wtx);
         AddToSpends(hash);
     }
@@ -936,6 +934,15 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose)
             wtx.fFromMe = wtxIn.fFromMe;
             fUpdated = true;
         }
+        // If we have a witness-stripped version of this transaction, and we
+        // see a new version with a witness, then we must be upgrading a pre-segwit
+        // wallet.  Store the new version of the transaction with the witness,
+        // as the stripped-version must be invalid.
+        // TODO: Store all versions of the transaction, instead of just one.
+        if (wtxIn.tx->HasWitness() && !wtx.tx->HasWitness()) {
+            wtx.SetTx(wtxIn.tx);
+            fUpdated = true;
+        }
     }
 
     //// debug print
@@ -953,9 +960,9 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose)
     NotifyTransactionChanged(this, hash, fInsertedNew ? CT_NEW : CT_UPDATED);
 
     // notify an external script when a wallet transaction comes in or is updated
-    std::string strCmd = GetArg("-walletnotify", "");
+    std::string strCmd = gArgs.GetArg("-walletnotify", "");
 
-    if ( !strCmd.empty())
+    if (!strCmd.empty())
     {
         boost::replace_all(strCmd, "%s", wtxIn.GetHash().GetHex());
         boost::thread t(runCommand, strCmd); // thread runs free
@@ -971,11 +978,12 @@ bool CWallet::LoadToWallet(const CWalletTx& wtxIn)
     mapWallet[hash] = wtxIn;
     CWalletTx& wtx = mapWallet[hash];
     wtx.BindWallet(this);
-    wtxOrdered.insert(std::make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry*)0)));
+    wtxOrdered.insert(std::make_pair(wtx.nOrderPos, TxPair(&wtx, nullptr)));
     AddToSpends(hash);
     for (const CTxIn& txin : wtx.tx->vin) {
-        if (mapWallet.count(txin.prevout.hash)) {
-            CWalletTx& prevtx = mapWallet[txin.prevout.hash];
+        auto it = mapWallet.find(txin.prevout.hash);
+        if (it != mapWallet.end()) {
+            CWalletTx& prevtx = it->second;
             if (prevtx.nIndex == -1 && !prevtx.hashUnset()) {
                 MarkConflicted(prevtx.hashBlock, wtx.GetHash());
             }
@@ -988,7 +996,7 @@ bool CWallet::LoadToWallet(const CWalletTx& wtxIn)
 /**
  * Add a transaction to the wallet, or update it.  pIndex and posInBlock should
  * be set when the transaction was known to be included in a block.  When
- * pIndex == NULL, then wallet state is not updated in AddToWallet, but
+ * pIndex == nullptr, then wallet state is not updated in AddToWallet, but
  * notifications happen and cached balances are marked dirty.
  *
  * If fUpdate is true, existing transactions will be updated.
@@ -1004,7 +1012,7 @@ bool CWallet::AddToWalletIfInvolvingMe(const CTransactionRef& ptx, const CBlockI
     {
         AssertLockHeld(cs_wallet);
 
-        if (pIndex != NULL) {
+        if (pIndex != nullptr) {
             for (const CTxIn& txin : tx.vin) {
                 std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range = mapTxSpends.equal_range(txin.prevout);
                 while (range.first != range.second) {
@@ -1021,10 +1029,34 @@ bool CWallet::AddToWalletIfInvolvingMe(const CTransactionRef& ptx, const CBlockI
         if (fExisted && !fUpdate) return false;
         if (fExisted || IsMine(tx) || IsFromMe(tx))
         {
+            /* Check if any keys in the wallet keypool that were supposed to be unused
+             * have appeared in a new transaction. If so, remove those keys from the keypool.
+             * This can happen when restoring an old wallet backup that does not contain
+             * the mostly recently created transactions from newer versions of the wallet.
+             */
+
+            // loop though all outputs
+            for (const CTxOut& txout: tx.vout) {
+                // extract addresses and check if they match with an unused keypool key
+                std::vector<CKeyID> vAffected;
+                CAffectedKeysVisitor(*this, vAffected).Process(txout.scriptPubKey);
+                for (const CKeyID &keyid : vAffected) {
+                    std::map<CKeyID, int64_t>::const_iterator mi = m_pool_key_to_index.find(keyid);
+                    if (mi != m_pool_key_to_index.end()) {
+                        LogPrintf("%s: Detected a used keypool key, mark all keypool key up to this key as used\n", __func__);
+                        MarkReserveKeysAsUsed(mi->second);
+
+                        if (!TopUpKeyPool()) {
+                            LogPrintf("%s: Topping up keypool failed (locked wallet)\n", __func__);
+                        }
+                    }
+                }
+            }
+
             CWalletTx wtx(this, ptx);
 
             // Get merkle branch if transaction was found in a block
-            if (pIndex != NULL)
+            if (pIndex != nullptr)
                 wtx.SetMerkleBranch(pIndex, posInBlock);
 
             return AddToWallet(wtx, false);
@@ -1050,8 +1082,9 @@ bool CWallet::AbandonTransaction(const uint256& hashTx)
     std::set<uint256> done;
 
     // Can't mark abandoned if confirmed or in mempool
-    assert(mapWallet.count(hashTx));
-    CWalletTx& origtx = mapWallet[hashTx];
+    auto it = mapWallet.find(hashTx);
+    assert(it != mapWallet.end());
+    CWalletTx& origtx = it->second;
     if (origtx.GetDepthInMainChain() > 0 || origtx.InMempool()) {
         return false;
     }
@@ -1062,8 +1095,9 @@ bool CWallet::AbandonTransaction(const uint256& hashTx)
         uint256 now = *todo.begin();
         todo.erase(now);
         done.insert(now);
-        assert(mapWallet.count(now));
-        CWalletTx& wtx = mapWallet[now];
+        auto it = mapWallet.find(now);
+        assert(it != mapWallet.end());
+        CWalletTx& wtx = it->second;
         int currentconfirm = wtx.GetDepthInMainChain();
         // If the orig tx was not in block, none of its spends can be
         assert(currentconfirm <= 0);
@@ -1088,8 +1122,10 @@ bool CWallet::AbandonTransaction(const uint256& hashTx)
             // available of the outputs it spends. So force those to be recomputed
             for (const CTxIn& txin : wtx.tx->vin)
             {
-                if (mapWallet.count(txin.prevout.hash))
-                    mapWallet[txin.prevout.hash].MarkDirty();
+                auto it = mapWallet.find(txin.prevout.hash);
+                if (it != mapWallet.end()) {
+                    it->second.MarkDirty();
+                }
             }
         }
     }
@@ -1127,8 +1163,9 @@ void CWallet::MarkConflicted(const uint256& hashBlock, const uint256& hashTx)
         uint256 now = *todo.begin();
         todo.erase(now);
         done.insert(now);
-        assert(mapWallet.count(now));
-        CWalletTx& wtx = mapWallet[now];
+        auto it = mapWallet.find(now);
+        assert(it != mapWallet.end());
+        CWalletTx& wtx = it->second;
         int currentconfirm = wtx.GetDepthInMainChain();
         if (conflictconfirms < currentconfirm) {
             // Block is 'more conflicted' than current confirm; update.
@@ -1147,10 +1184,11 @@ void CWallet::MarkConflicted(const uint256& hashBlock, const uint256& hashTx)
             }
             // If a transaction changes 'conflicted' state, that changes the balance
             // available of the outputs it spends. So force those to be recomputed
-            for (const CTxIn& txin : wtx.tx->vin)
-            {
-                if (mapWallet.count(txin.prevout.hash))
-                    mapWallet[txin.prevout.hash].MarkDirty();
+            for (const CTxIn& txin : wtx.tx->vin) {
+                auto it = mapWallet.find(txin.prevout.hash);
+                if (it != mapWallet.end()) {
+                    it->second.MarkDirty();
+                }
             }
         }
     }
@@ -1165,10 +1203,11 @@ void CWallet::SyncTransaction(const CTransactionRef& ptx, const CBlockIndex *pin
     // If a transaction changes 'conflicted' state, that changes the balance
     // available of the outputs it spends. So force those to be
     // recomputed, also:
-    for (const CTxIn& txin : tx.vin)
-    {
-        if (mapWallet.count(txin.prevout.hash))
-            mapWallet[txin.prevout.hash].MarkDirty();
+    for (const CTxIn& txin : tx.vin) {
+        auto it = mapWallet.find(txin.prevout.hash);
+        if (it != mapWallet.end()) {
+            it->second.MarkDirty();
+        }
     }
 }
 
@@ -1529,7 +1568,7 @@ int64_t CWallet::RescanFromTime(int64_t startTime, bool update)
     LogPrintf("%s: Rescanning last %i blocks\n", __func__, startBlock ? chainActive.Height() - startBlock->nHeight + 1 : 0);
 
     if (startBlock) {
-        const CBlockIndex* const failedBlock = ScanForWalletTransactions(startBlock, update);
+        const CBlockIndex* const failedBlock = ScanForWalletTransactions(startBlock, nullptr, update);
         if (failedBlock) {
             return failedBlock->GetBlockTimeMax() + TIMESTAMP_WINDOW + 1;
         }
@@ -1545,12 +1584,19 @@ int64_t CWallet::RescanFromTime(int64_t startTime, bool update)
  * Returns null if scan was successful. Otherwise, if a complete rescan was not
  * possible (due to pruning or corruption), returns pointer to the most recent
  * block that could not be scanned.
+ *
+ * If pindexStop is not a nullptr, the scan will stop at the block-index
+ * defined by pindexStop
  */
-CBlockIndex* CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate)
+CBlockIndex* CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, CBlockIndex* pindexStop, bool fUpdate)
 {
     int64_t nNow = GetTime();
     const CChainParams& chainParams = Params();
 
+    if (pindexStop) {
+        assert(pindexStop->nHeight >= pindexStart->nHeight);
+    }
+
     CBlockIndex* pindex = pindexStart;
     CBlockIndex* ret = nullptr;
     {
@@ -1578,6 +1624,9 @@ CBlockIndex* CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool f
             } else {
                 ret = pindex;
             }
+            if (pindex == pindexStop) {
+                break;
+            }
             pindex = chainActive.Next(pindex);
         }
         if (pindex && fAbortRescan) {
@@ -1648,7 +1697,7 @@ bool CWalletTx::RelayWalletTransaction(CConnman* connman)
 std::set<uint256> CWalletTx::GetConflicts() const
 {
     std::set<uint256> result;
-    if (pwallet != NULL)
+    if (pwallet != nullptr)
     {
         uint256 myHash = GetHash();
         result = pwallet->GetConflicts(myHash);
@@ -1737,7 +1786,7 @@ CAmount CWalletTx::GetImmatureCredit(bool fUseCache) const
 
 CAmount CWalletTx::GetAvailableCredit(bool fUseCache) const
 {
-    if (pwallet == 0)
+    if (pwallet == nullptr)
         return 0;
 
     // Must wait until coinbase is safely deep enough in the chain before valuing it
@@ -1781,7 +1830,7 @@ CAmount CWalletTx::GetImmatureWatchOnlyCredit(const bool& fUseCache) const
 
 CAmount CWalletTx::GetAvailableWatchOnlyCredit(const bool& fUseCache) const
 {
-    if (pwallet == 0)
+    if (pwallet == nullptr)
         return 0;
 
     // Must wait until coinbase is safely deep enough in the chain before valuing it
@@ -1845,7 +1894,7 @@ bool CWalletTx::IsTrusted() const
     {
         // Transactions not sent by us: not trusted
         const CWalletTx* parent = pwallet->GetWalletTx(txin.prevout.hash);
-        if (parent == NULL)
+        if (parent == nullptr)
             return false;
         const CTxOut& parentOut = parent->tx->vout[txin.prevout.n];
         if (pwallet->IsMine(parentOut) != ISMINE_SPENDABLE)
@@ -2444,8 +2493,8 @@ bool CWallet::SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAm
             ++it;
     }
 
-    size_t nMaxChainLength = std::min(GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT), GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT));
-    bool fRejectLongChains = GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS);
+    size_t nMaxChainLength = std::min(gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT), gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT));
+    bool fRejectLongChains = gArgs.GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS);
 
     bool res = nTargetValue <= nValueFromPresetInputs ||
         SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 1, 6, 0, vCoins, setCoinsRet, nValueRet) ||
@@ -2514,7 +2563,7 @@ bool CWallet::FundTransaction(CMutableTransaction& tx, CAmount& nFeeRet, int& nC
 
     if (nChangePosInOut != -1) {
         tx.vout.insert(tx.vout.begin() + nChangePosInOut, wtx.tx->vout[nChangePosInOut]);
-        // we dont have the normal Create/Commit cycle, and dont want to risk reusing change,
+        // we don't have the normal Create/Commit cycle, and don't want to risk reusing change,
         // so just remove the key from the keypool here.
         reservekey.KeepKey();
     }
@@ -2542,17 +2591,6 @@ bool CWallet::FundTransaction(CMutableTransaction& tx, CAmount& nFeeRet, int& nC
     return true;
 }
 
-static CFeeRate GetDiscardRate(const CBlockPolicyEstimator& estimator)
-{
-    unsigned int highest_target = estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
-    CFeeRate discard_rate = estimator.estimateSmartFee(highest_target, nullptr /* FeeCalculation */, false /* conservative */);
-    // Don't let discard_rate be greater than longest possible fee estimate if we get a valid fee estimate
-    discard_rate = (discard_rate == CFeeRate(0)) ? CWallet::m_discard_rate : std::min(discard_rate, CWallet::m_discard_rate);
-    // Discard rate must be at least dustRelayFee
-    discard_rate = std::max(discard_rate, ::dustRelayFee);
-    return discard_rate;
-}
-
 bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, CAmount& nFeeRet,
                                 int& nChangePosInOut, std::string& strFailReason, const CCoinControl& coin_control, bool sign)
 {
@@ -2613,6 +2651,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
     assert(txNew.nLockTime <= (unsigned int)chainActive.Height());
     assert(txNew.nLockTime < LOCKTIME_THRESHOLD);
     FeeCalculation feeCalc;
+    CAmount nFeeNeeded;
     unsigned int nBytes;
     {
         std::set<CInputCoin> setCoins;
@@ -2675,6 +2714,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
 
                     if (recipient.fSubtractFeeFromAmount)
                     {
+                        assert(nSubtractFeeFromAmount != 0);
                         txout.nValue -= nFeeRet / nSubtractFeeFromAmount; // Subtract fee equally from each selected recipient
 
                         if (fFirst) // first receiver pays the remainder not divisible by output count
@@ -2774,7 +2814,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
                     vin.scriptWitness.SetNull();
                 }
 
-                CAmount nFeeNeeded = GetMinimumFee(nBytes, coin_control, ::mempool, ::feeEstimator, &feeCalc);
+                nFeeNeeded = GetMinimumFee(nBytes, coin_control, ::mempool, ::feeEstimator, &feeCalc);
 
                 // If we made it here and we aren't even able to meet the relay fee on the next pass, give up
                 // because we must be at the maximum allowed fee.
@@ -2795,13 +2835,15 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
                     // new inputs. We now know we only need the smaller fee
                     // (because of reduced tx size) and so we should add a
                     // change output. Only try this once.
-                    CAmount fee_needed_for_change = GetMinimumFee(change_prototype_size, coin_control, ::mempool, ::feeEstimator, nullptr);
-                    CAmount minimum_value_for_change = GetDustThreshold(change_prototype_txout, discard_rate);
-                    CAmount max_excess_fee = fee_needed_for_change + minimum_value_for_change;
-                    if (nFeeRet > nFeeNeeded + max_excess_fee && nChangePosInOut == -1 && nSubtractFeeFromAmount == 0 && pick_new_inputs) {
-                        pick_new_inputs = false;
-                        nFeeRet = nFeeNeeded + fee_needed_for_change;
-                        continue;
+                    if (nChangePosInOut == -1 && nSubtractFeeFromAmount == 0 && pick_new_inputs) {
+                        unsigned int tx_size_with_change = nBytes + change_prototype_size + 2; // Add 2 as a buffer in case increasing # of outputs changes compact size
+                        CAmount fee_needed_with_change = GetMinimumFee(tx_size_with_change, coin_control, ::mempool, ::feeEstimator, nullptr);
+                        CAmount minimum_value_for_change = GetDustThreshold(change_prototype_txout, discard_rate);
+                        if (nFeeRet >= fee_needed_with_change + minimum_value_for_change) {
+                            pick_new_inputs = false;
+                            nFeeRet = fee_needed_with_change;
+                            continue;
+                        }
                     }
 
                     // If we have change output already, just increase it
@@ -2880,15 +2922,15 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
         }
     }
 
-    if (GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS)) {
+    if (gArgs.GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS)) {
         // Lastly, ensure this tx will pass the mempool's chain limits
         LockPoints lp;
         CTxMemPoolEntry entry(wtxNew.tx, 0, 0, 0, false, 0, lp);
         CTxMemPool::setEntries setAncestors;
-        size_t nLimitAncestors = GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
-        size_t nLimitAncestorSize = GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT)*1000;
-        size_t nLimitDescendants = GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
-        size_t nLimitDescendantSize = GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT)*1000;
+        size_t nLimitAncestors = gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
+        size_t nLimitAncestorSize = gArgs.GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT)*1000;
+        size_t nLimitDescendants = gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
+        size_t nLimitDescendantSize = gArgs.GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT)*1000;
         std::string errString;
         if (!mempool.CalculateMemPoolAncestors(entry, setAncestors, nLimitAncestors, nLimitAncestorSize, nLimitDescendants, nLimitDescendantSize, errString)) {
             strFailReason = _("Transaction has too long of a mempool chain");
@@ -2896,8 +2938,8 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
         }
     }
 
-    LogPrintf("Fee Calculation: Fee:%d Bytes:%u Tgt:%d (requested %d) Reason:\"%s\" Decay %.5f: Estimation: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out) Fail: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out)\n",
-              nFeeRet, nBytes, feeCalc.returnedTarget, feeCalc.desiredTarget, StringForFeeReason(feeCalc.reason), feeCalc.est.decay,
+    LogPrintf("Fee Calculation: Fee:%d Bytes:%u Needed:%d Tgt:%d (requested %d) Reason:\"%s\" Decay %.5f: Estimation: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out) Fail: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out)\n",
+              nFeeRet, nBytes, nFeeNeeded, feeCalc.returnedTarget, feeCalc.desiredTarget, StringForFeeReason(feeCalc.reason), feeCalc.est.decay,
               feeCalc.est.pass.start, feeCalc.est.pass.end,
               100 * feeCalc.est.pass.withinTarget / (feeCalc.est.pass.totalConfirmed + feeCalc.est.pass.inMempool + feeCalc.est.pass.leftMempool),
               feeCalc.est.pass.withinTarget, feeCalc.est.pass.totalConfirmed, feeCalc.est.pass.inMempool, feeCalc.est.pass.leftMempool,
@@ -2969,96 +3011,35 @@ bool CWallet::AddAccountingEntry(const CAccountingEntry& acentry, CWalletDB *pwa
 
     laccentries.push_back(acentry);
     CAccountingEntry & entry = laccentries.back();
-    wtxOrdered.insert(std::make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));
+    wtxOrdered.insert(std::make_pair(entry.nOrderPos, TxPair(nullptr, &entry)));
 
     return true;
 }
 
-CAmount CWallet::GetRequiredFee(unsigned int nTxBytes)
-{
-    return std::max(minTxFee.GetFee(nTxBytes), ::minRelayTxFee.GetFee(nTxBytes));
-}
-
-CAmount CWallet::GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc)
-{
-    /* User control of how to calculate fee uses the following parameter precedence:
-       1. coin_control.m_feerate
-       2. coin_control.m_confirm_target
-       3. payTxFee (user-set global variable)
-       4. nTxConfirmTarget (user-set global variable)
-       The first parameter that is set is used.
-    */
-    CAmount fee_needed;
-    if (coin_control.m_feerate) { // 1.
-        fee_needed = coin_control.m_feerate->GetFee(nTxBytes);
-        if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
-        // Allow to override automatic min/max check over coin control instance
-        if (coin_control.fOverrideFeeRate) return fee_needed;
-    }
-    else if (!coin_control.m_confirm_target && ::payTxFee != CFeeRate(0)) { // 3. TODO: remove magic value of 0 for global payTxFee
-        fee_needed = ::payTxFee.GetFee(nTxBytes);
-        if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
-    }
-    else { // 2. or 4.
-        // We will use smart fee estimation
-        unsigned int target = coin_control.m_confirm_target ? *coin_control.m_confirm_target : ::nTxConfirmTarget;
-        // By default estimates are economical iff we are signaling opt-in-RBF
-        bool conservative_estimate = !coin_control.signalRbf;
-        // Allow to override the default fee estimate mode over the CoinControl instance
-        if (coin_control.m_fee_mode == FeeEstimateMode::CONSERVATIVE) conservative_estimate = true;
-        else if (coin_control.m_fee_mode == FeeEstimateMode::ECONOMICAL) conservative_estimate = false;
-
-        fee_needed = estimator.estimateSmartFee(target, feeCalc, conservative_estimate).GetFee(nTxBytes);
-        if (fee_needed == 0) {
-            // if we don't have enough data for estimateSmartFee, then use fallbackFee
-            fee_needed = fallbackFee.GetFee(nTxBytes);
-            if (feeCalc) feeCalc->reason = FeeReason::FALLBACK;
-        }
-        // Obey mempool min fee when using smart fee estimation
-        CAmount min_mempool_fee = pool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nTxBytes);
-        if (fee_needed < min_mempool_fee) {
-            fee_needed = min_mempool_fee;
-            if (feeCalc) feeCalc->reason = FeeReason::MEMPOOL_MIN;
-        }
-    }
-
-    // prevent user from paying a fee below minRelayTxFee or minTxFee
-    CAmount required_fee = GetRequiredFee(nTxBytes);
-    if (required_fee > fee_needed) {
-        fee_needed = required_fee;
-        if (feeCalc) feeCalc->reason = FeeReason::REQUIRED;
-    }
-    // But always obey the maximum
-    if (fee_needed > maxTxFee) {
-        fee_needed = maxTxFee;
-        if (feeCalc) feeCalc->reason = FeeReason::MAXTXFEE;
-    }
-    return fee_needed;
-}
-
-
-
-
 DBErrors CWallet::LoadWallet(bool& fFirstRunRet)
 {
+    LOCK2(cs_main, cs_wallet);
+
     fFirstRunRet = false;
     DBErrors nLoadWalletRet = CWalletDB(*dbw,"cr+").LoadWallet(this);
     if (nLoadWalletRet == DB_NEED_REWRITE)
     {
         if (dbw->Rewrite("\x04pool"))
         {
-            LOCK(cs_wallet);
             setInternalKeyPool.clear();
             setExternalKeyPool.clear();
+            m_pool_key_to_index.clear();
             // Note: can't top-up keypool here, because wallet is locked.
             // User will be prompted to unlock wallet the next operation
             // that requires a new key.
         }
     }
 
+    // This wallet is in its first run if all of these are empty
+    fFirstRunRet = mapKeys.empty() && mapCryptedKeys.empty() && mapWatchKeys.empty() && setWatchOnly.empty() && mapScripts.empty();
+
     if (nLoadWalletRet != DB_LOAD_OK)
         return nLoadWalletRet;
-    fFirstRunRet = !vchDefaultKey.IsValid();
 
     uiInterface.LoadWallet(this);
 
@@ -3068,7 +3049,6 @@ DBErrors CWallet::LoadWallet(bool& fFirstRunRet)
 DBErrors CWallet::ZapSelectTx(std::vector<uint256>& vHashIn, std::vector<uint256>& vHashOut)
 {
     AssertLockHeld(cs_wallet); // mapWallet
-    vchDefaultKey = CPubKey();
     DBErrors nZapSelectTxRet = CWalletDB(*dbw,"cr+").ZapSelectTx(vHashIn, vHashOut);
     for (uint256 hash : vHashOut)
         mapWallet.erase(hash);
@@ -3079,6 +3059,7 @@ DBErrors CWallet::ZapSelectTx(std::vector<uint256>& vHashIn, std::vector<uint256
         {
             setInternalKeyPool.clear();
             setExternalKeyPool.clear();
+            m_pool_key_to_index.clear();
             // Note: can't top-up keypool here, because wallet is locked.
             // User will be prompted to unlock wallet the next operation
             // that requires a new key.
@@ -3096,7 +3077,6 @@ DBErrors CWallet::ZapSelectTx(std::vector<uint256>& vHashIn, std::vector<uint256
 
 DBErrors CWallet::ZapWalletTx(std::vector<CWalletTx>& vWtx)
 {
-    vchDefaultKey = CPubKey();
     DBErrors nZapWalletTxRet = CWalletDB(*dbw,"cr+").ZapWalletTx(vWtx);
     if (nZapWalletTxRet == DB_NEED_REWRITE)
     {
@@ -3105,6 +3085,7 @@ DBErrors CWallet::ZapWalletTx(std::vector<CWalletTx>& vWtx)
             LOCK(cs_wallet);
             setInternalKeyPool.clear();
             setExternalKeyPool.clear();
+            m_pool_key_to_index.clear();
             // Note: can't top-up keypool here, because wallet is locked.
             // User will be prompted to unlock wallet the next operation
             // that requires a new key.
@@ -3131,9 +3112,9 @@ bool CWallet::SetAddressBook(const CTxDestination& address, const std::string& s
     }
     NotifyAddressBookChanged(this, address, strName, ::IsMine(*this, address) != ISMINE_NO,
                              strPurpose, (fUpdated ? CT_UPDATED : CT_NEW) );
-    if (!strPurpose.empty() && !CWalletDB(*dbw).WritePurpose(CBitcoinAddress(address).ToString(), strPurpose))
+    if (!strPurpose.empty() && !CWalletDB(*dbw).WritePurpose(EncodeDestination(address), strPurpose))
         return false;
-    return CWalletDB(*dbw).WriteName(CBitcoinAddress(address).ToString(), strName);
+    return CWalletDB(*dbw).WriteName(EncodeDestination(address), strName);
 }
 
 bool CWallet::DelAddressBook(const CTxDestination& address)
@@ -3142,7 +3123,7 @@ bool CWallet::DelAddressBook(const CTxDestination& address)
         LOCK(cs_wallet); // mapAddressBook
 
         // Delete destdata tuples associated with address
-        std::string strAddress = CBitcoinAddress(address).ToString();
+        std::string strAddress = EncodeDestination(address);
         for (const std::pair<std::string, std::string> &item : mapAddressBook[address].destdata)
         {
             CWalletDB(*dbw).EraseDestData(strAddress, item.first);
@@ -3152,8 +3133,8 @@ bool CWallet::DelAddressBook(const CTxDestination& address)
 
     NotifyAddressBookChanged(this, address, "", ::IsMine(*this, address) != ISMINE_NO, "", CT_DELETED);
 
-    CWalletDB(*dbw).ErasePurpose(CBitcoinAddress(address).ToString());
-    return CWalletDB(*dbw).EraseName(CBitcoinAddress(address).ToString());
+    CWalletDB(*dbw).ErasePurpose(EncodeDestination(address));
+    return CWalletDB(*dbw).EraseName(EncodeDestination(address));
 }
 
 const std::string& CWallet::GetAccountName(const CScript& scriptPubKey) const
@@ -3171,14 +3152,6 @@ const std::string& CWallet::GetAccountName(const CScript& scriptPubKey) const
     return DEFAULT_ACCOUNT_NAME;
 }
 
-bool CWallet::SetDefaultKey(const CPubKey &vchPubKey)
-{
-    if (!CWalletDB(*dbw).WriteDefaultKey(vchPubKey))
-        return false;
-    vchDefaultKey = vchPubKey;
-    return true;
-}
-
 /**
  * Mark old keypool keys as used,
  * and generate all new keys
@@ -3199,6 +3172,8 @@ bool CWallet::NewKeyPool()
         }
         setExternalKeyPool.clear();
 
+        m_pool_key_to_index.clear();
+
         if (!TopUpKeyPool()) {
             return false;
         }
@@ -3213,6 +3188,25 @@ size_t CWallet::KeypoolCountExternalKeys()
     return setExternalKeyPool.size();
 }
 
+void CWallet::LoadKeyPool(int64_t nIndex, const CKeyPool &keypool)
+{
+    AssertLockHeld(cs_wallet);
+    if (keypool.fInternal) {
+        setInternalKeyPool.insert(nIndex);
+    } else {
+        setExternalKeyPool.insert(nIndex);
+    }
+    m_max_keypool_index = std::max(m_max_keypool_index, nIndex);
+    m_pool_key_to_index[keypool.vchPubKey.GetID()] = nIndex;
+
+    // If no metadata exists yet, create a default with the pool key's
+    // creation time. Note that this may be overwritten by actually
+    // stored metadata for that key later, which is fine.
+    CKeyID keyid = keypool.vchPubKey.GetID();
+    if (mapKeyMetadata.count(keyid) == 0)
+        mapKeyMetadata[keyid] = CKeyMetadata(keypool.nTime);
+}
+
 bool CWallet::TopUpKeyPool(unsigned int kpSize)
 {
     {
@@ -3226,7 +3220,7 @@ bool CWallet::TopUpKeyPool(unsigned int kpSize)
         if (kpSize > 0)
             nTargetSize = kpSize;
         else
-            nTargetSize = std::max(GetArg("-keypool", DEFAULT_KEYPOOL_SIZE), (int64_t) 0);
+            nTargetSize = std::max(gArgs.GetArg("-keypool", DEFAULT_KEYPOOL_SIZE), (int64_t) 0);
 
         // count amount of available keys (internal, external)
         // make sure the keypool of external and internal keys fits the user selected target (-keypool)
@@ -3249,7 +3243,8 @@ bool CWallet::TopUpKeyPool(unsigned int kpSize)
             assert(m_max_keypool_index < std::numeric_limits<int64_t>::max()); // How in the hell did you use so many keys?
             int64_t index = ++m_max_keypool_index;
 
-            if (!walletdb.WritePool(index, CKeyPool(GenerateNewKey(walletdb, internal), internal))) {
+            CPubKey pubkey(GenerateNewKey(walletdb, internal));
+            if (!walletdb.WritePool(index, CKeyPool(pubkey, internal))) {
                 throw std::runtime_error(std::string(__func__) + ": writing generated key failed");
             }
 
@@ -3258,6 +3253,7 @@ bool CWallet::TopUpKeyPool(unsigned int kpSize)
             } else {
                 setExternalKeyPool.insert(index);
             }
+            m_pool_key_to_index[pubkey.GetID()] = index;
         }
         if (missingInternal + missingExternal > 0) {
             LogPrintf("keypool added %d keys (%d internal), size=%u (%u internal)\n", missingInternal + missingExternal, missingInternal, setInternalKeyPool.size() + setExternalKeyPool.size(), setInternalKeyPool.size());
@@ -3299,6 +3295,7 @@ void CWallet::ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool, bool fRe
         }
 
         assert(keypool.vchPubKey.IsValid());
+        m_pool_key_to_index.erase(keypool.vchPubKey.GetID());
         LogPrintf("keypool reserve %d\n", nIndex);
     }
 }
@@ -3311,7 +3308,7 @@ void CWallet::KeepKey(int64_t nIndex)
     LogPrintf("keypool keep %d\n", nIndex);
 }
 
-void CWallet::ReturnKey(int64_t nIndex, bool fInternal)
+void CWallet::ReturnKey(int64_t nIndex, bool fInternal, const CPubKey& pubkey)
 {
     // Return to key pool
     {
@@ -3321,6 +3318,7 @@ void CWallet::ReturnKey(int64_t nIndex, bool fInternal)
         } else {
             setExternalKeyPool.insert(nIndex);
         }
+        m_pool_key_to_index[pubkey.GetID()] = nIndex;
     }
     LogPrintf("keypool return %d\n", nIndex);
 }
@@ -3550,38 +3548,32 @@ void CReserveKey::KeepKey()
 void CReserveKey::ReturnKey()
 {
     if (nIndex != -1) {
-        pwallet->ReturnKey(nIndex, fInternal);
+        pwallet->ReturnKey(nIndex, fInternal, vchPubKey);
     }
     nIndex = -1;
     vchPubKey = CPubKey();
 }
 
-static void LoadReserveKeysToSet(std::set<CKeyID>& setAddress, const std::set<int64_t>& setKeyPool, CWalletDB& walletdb) {
-    for (const int64_t& id : setKeyPool)
-    {
-        CKeyPool keypool;
-        if (!walletdb.ReadPool(id, keypool))
-            throw std::runtime_error(std::string(__func__) + ": read failed");
-        assert(keypool.vchPubKey.IsValid());
-        CKeyID keyID = keypool.vchPubKey.GetID();
-        setAddress.insert(keyID);
-    }
-}
-
-void CWallet::GetAllReserveKeys(std::set<CKeyID>& setAddress) const
+void CWallet::MarkReserveKeysAsUsed(int64_t keypool_id)
 {
-    setAddress.clear();
+    AssertLockHeld(cs_wallet);
+    bool internal = setInternalKeyPool.count(keypool_id);
+    if (!internal) assert(setExternalKeyPool.count(keypool_id));
+    std::set<int64_t> *setKeyPool = internal ? &setInternalKeyPool : &setExternalKeyPool;
+    auto it = setKeyPool->begin();
 
     CWalletDB walletdb(*dbw);
+    while (it != std::end(*setKeyPool)) {
+        const int64_t& index = *(it);
+        if (index > keypool_id) break; // set*KeyPool is ordered
 
-    LOCK2(cs_main, cs_wallet);
-    LoadReserveKeysToSet(setAddress, setInternalKeyPool, walletdb);
-    LoadReserveKeysToSet(setAddress, setExternalKeyPool, walletdb);
-
-    for (const CKeyID& keyID : setAddress) {
-        if (!HaveKey(keyID)) {
-            throw std::runtime_error(std::string(__func__) + ": unknown key in key pool");
+        CKeyPool keypool;
+        if (walletdb.ReadPool(index, keypool)) { //TODO: This should be unnecessary
+            m_pool_key_to_index.erase(keypool.vchPubKey.GetID());
         }
+        walletdb.ErasePool(index);
+        LogPrintf("keypool index %d removed\n", index);
+        it = setKeyPool->erase(it);
     }
 }
 
@@ -3634,38 +3626,6 @@ void CWallet::ListLockedCoins(std::vector<COutPoint>& vOutpts) const
 
 /** @} */ // end of Actions
 
-class CAffectedKeysVisitor : public boost::static_visitor<void> {
-private:
-    const CKeyStore &keystore;
-    std::vector<CKeyID> &vKeys;
-
-public:
-    CAffectedKeysVisitor(const CKeyStore &keystoreIn, std::vector<CKeyID> &vKeysIn) : keystore(keystoreIn), vKeys(vKeysIn) {}
-
-    void Process(const CScript &script) {
-        txnouttype type;
-        std::vector<CTxDestination> vDest;
-        int nRequired;
-        if (ExtractDestinations(script, type, vDest, nRequired)) {
-            for (const CTxDestination &dest : vDest)
-                boost::apply_visitor(*this, dest);
-        }
-    }
-
-    void operator()(const CKeyID &keyId) {
-        if (keystore.HaveKey(keyId))
-            vKeys.push_back(keyId);
-    }
-
-    void operator()(const CScriptID &scriptId) {
-        CScript script;
-        if (keystore.GetCScript(scriptId, script))
-            Process(script);
-    }
-
-    void operator()(const CNoDestination &none) {}
-};
-
 void CWallet::GetKeyBirthTimes(std::map<CTxDestination, int64_t> &mapKeyBirth) const {
     AssertLockHeld(cs_wallet); // mapKeyMetadata
     mapKeyBirth.clear();
@@ -3680,13 +3640,10 @@ void CWallet::GetKeyBirthTimes(std::map<CTxDestination, int64_t> &mapKeyBirth) c
     // map in which we'll infer heights of other keys
     CBlockIndex *pindexMax = chainActive[std::max(0, chainActive.Height() - 144)]; // the tip can be reorganized; use a 144-block safety margin
     std::map<CKeyID, CBlockIndex*> mapKeyFirstBlock;
-    std::set<CKeyID> setKeys;
-    GetKeys(setKeys);
-    for (const CKeyID &keyid : setKeys) {
+    for (const CKeyID &keyid : GetKeys()) {
         if (mapKeyBirth.count(keyid) == 0)
             mapKeyFirstBlock[keyid] = pindexMax;
     }
-    setKeys.clear();
 
     // if there are no such keys, we're done
     if (mapKeyFirstBlock.empty())
@@ -3791,14 +3748,14 @@ bool CWallet::AddDestData(const CTxDestination &dest, const std::string &key, co
         return false;
 
     mapAddressBook[dest].destdata.insert(std::make_pair(key, value));
-    return CWalletDB(*dbw).WriteDestData(CBitcoinAddress(dest).ToString(), key, value);
+    return CWalletDB(*dbw).WriteDestData(EncodeDestination(dest), key, value);
 }
 
 bool CWallet::EraseDestData(const CTxDestination &dest, const std::string &key)
 {
     if (!mapAddressBook[dest].destdata.erase(key))
         return false;
-    return CWalletDB(*dbw).EraseDestData(CBitcoinAddress(dest).ToString(), key);
+    return CWalletDB(*dbw).EraseDestData(EncodeDestination(dest), key);
 }
 
 bool CWallet::LoadDestData(const CTxDestination &dest, const std::string &key, const std::string &value)
@@ -3837,64 +3794,21 @@ std::vector<std::string> CWallet::GetDestValues(const std::string& prefix) const
     return values;
 }
 
-std::string CWallet::GetWalletHelpString(bool showDebug)
-{
-    std::string strUsage = HelpMessageGroup(_("Wallet options:"));
-    strUsage += HelpMessageOpt("-disablewallet", _("Do not load the wallet and disable wallet RPC calls"));
-    strUsage += HelpMessageOpt("-keypool=<n>", strprintf(_("Set key pool size to <n> (default: %u)"), DEFAULT_KEYPOOL_SIZE));
-    strUsage += HelpMessageOpt("-fallbackfee=<amt>", strprintf(_("A fee rate (in %s/kB) that will be used when fee estimation has insufficient data (default: %s)"),
-                                                               CURRENCY_UNIT, FormatMoney(DEFAULT_FALLBACK_FEE)));
-    strUsage += HelpMessageOpt("-discardfee=<amt>", strprintf(_("The fee rate (in %s/kB) that indicates your tolerance for discarding change by adding it to the fee (default: %s). "
-                                                                "Note: An output is discarded if it is dust at this rate, but we will always discard up to the dust relay fee and a discard fee above that is limited by the fee estimate for the longest target"),
-                                                              CURRENCY_UNIT, FormatMoney(DEFAULT_DISCARD_FEE)));
-    strUsage += HelpMessageOpt("-mintxfee=<amt>", strprintf(_("Fees (in %s/kB) smaller than this are considered zero fee for transaction creation (default: %s)"),
-                                                            CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MINFEE)));
-    strUsage += HelpMessageOpt("-paytxfee=<amt>", strprintf(_("Fee (in %s/kB) to add to transactions you send (default: %s)"),
-                                                            CURRENCY_UNIT, FormatMoney(payTxFee.GetFeePerK())));
-    strUsage += HelpMessageOpt("-rescan", _("Rescan the block chain for missing wallet transactions on startup"));
-    strUsage += HelpMessageOpt("-salvagewallet", _("Attempt to recover private keys from a corrupt wallet on startup"));
-    strUsage += HelpMessageOpt("-spendzeroconfchange", strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), DEFAULT_SPEND_ZEROCONF_CHANGE));
-    strUsage += HelpMessageOpt("-txconfirmtarget=<n>", strprintf(_("If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: %u)"), DEFAULT_TX_CONFIRM_TARGET));
-    strUsage += HelpMessageOpt("-usehd", _("Use hierarchical deterministic key generation (HD) after BIP32. Only has effect during wallet creation/first start") + " " + strprintf(_("(default: %u)"), DEFAULT_USE_HD_WALLET));
-    strUsage += HelpMessageOpt("-walletrbf", strprintf(_("Send transactions with full-RBF opt-in enabled (default: %u)"), DEFAULT_WALLET_RBF));
-    strUsage += HelpMessageOpt("-upgradewallet", _("Upgrade wallet to latest format on startup"));
-    strUsage += HelpMessageOpt("-wallet=<file>", _("Specify wallet file (within data directory)") + " " + strprintf(_("(default: %s)"), DEFAULT_WALLET_DAT));
-    strUsage += HelpMessageOpt("-walletbroadcast", _("Make the wallet broadcast transactions") + " " + strprintf(_("(default: %u)"), DEFAULT_WALLETBROADCAST));
-    strUsage += HelpMessageOpt("-walletnotify=<cmd>", _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)"));
-    strUsage += HelpMessageOpt("-zapwallettxes=<mode>", _("Delete all wallet transactions and only recover those parts of the blockchain through -rescan on startup") +
-                               " " + _("(1 = keep tx meta data e.g. account owner and payment request information, 2 = drop tx meta data)"));
-
-    if (showDebug)
-    {
-        strUsage += HelpMessageGroup(_("Wallet debugging/testing options:"));
-
-        strUsage += HelpMessageOpt("-dblogsize=<n>", strprintf("Flush wallet database activity from memory to disk log every <n> megabytes (default: %u)", DEFAULT_WALLET_DBLOGSIZE));
-        strUsage += HelpMessageOpt("-flushwallet", strprintf("Run a thread to flush wallet periodically (default: %u)", DEFAULT_FLUSHWALLET));
-        strUsage += HelpMessageOpt("-privdb", strprintf("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)", DEFAULT_WALLET_PRIVDB));
-        strUsage += HelpMessageOpt("-walletrejectlongchains", strprintf(_("Wallet will not create transactions that violate mempool chain limits (default: %u)"), DEFAULT_WALLET_REJECT_LONG_CHAINS));
-    }
-
-    return strUsage;
-}
-
 CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
 {
     // needed to restore wallet transaction meta data after -zapwallettxes
     std::vector<CWalletTx> vWtx;
 
-    if (GetBoolArg("-zapwallettxes", false)) {
+    if (gArgs.GetBoolArg("-zapwallettxes", false)) {
         uiInterface.InitMessage(_("Zapping all transactions from wallet..."));
 
         std::unique_ptr<CWalletDBWrapper> dbw(new CWalletDBWrapper(&bitdb, walletFile));
-        CWallet *tempWallet = new CWallet(std::move(dbw));
+        std::unique_ptr<CWallet> tempWallet(new CWallet(std::move(dbw)));
         DBErrors nZapWalletRet = tempWallet->ZapWalletTx(vWtx);
         if (nZapWalletRet != DB_LOAD_OK) {
             InitError(strprintf(_("Error loading %s: Wallet corrupted"), walletFile));
-            return NULL;
+            return nullptr;
         }
-
-        delete tempWallet;
-        tempWallet = NULL;
     }
 
     uiInterface.InitMessage(_("Loading wallet..."));
@@ -3908,7 +3822,7 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
     {
         if (nLoadWalletRet == DB_CORRUPT) {
             InitError(strprintf(_("Error loading %s: Wallet corrupted"), walletFile));
-            return NULL;
+            return nullptr;
         }
         else if (nLoadWalletRet == DB_NONCRITICAL_ERROR)
         {
@@ -3918,22 +3832,22 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
         }
         else if (nLoadWalletRet == DB_TOO_NEW) {
             InitError(strprintf(_("Error loading %s: Wallet requires newer version of %s"), walletFile, _(PACKAGE_NAME)));
-            return NULL;
+            return nullptr;
         }
         else if (nLoadWalletRet == DB_NEED_REWRITE)
         {
             InitError(strprintf(_("Wallet needed to be rewritten: restart %s to complete"), _(PACKAGE_NAME)));
-            return NULL;
+            return nullptr;
         }
         else {
             InitError(strprintf(_("Error loading %s"), walletFile));
-            return NULL;
+            return nullptr;
         }
     }
 
-    if (GetBoolArg("-upgradewallet", fFirstRun))
+    if (gArgs.GetBoolArg("-upgradewallet", fFirstRun))
     {
-        int nMaxVersion = GetArg("-upgradewallet", 0);
+        int nMaxVersion = gArgs.GetArg("-upgradewallet", 0);
         if (nMaxVersion == 0) // the -upgradewallet without argument case
         {
             LogPrintf("Performing wallet upgrade to %i\n", FEATURE_LATEST);
@@ -3945,44 +3859,42 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
         if (nMaxVersion < walletInstance->GetVersion())
         {
             InitError(_("Cannot downgrade wallet"));
-            return NULL;
+            return nullptr;
         }
         walletInstance->SetMaxVersion(nMaxVersion);
     }
 
     if (fFirstRun)
     {
-        // Create new keyUser and set as default key
-        if (GetBoolArg("-usehd", DEFAULT_USE_HD_WALLET) && !walletInstance->IsHDEnabled()) {
+        // ensure this wallet.dat can only be opened by clients supporting HD with chain split and expects no default key
+        if (!gArgs.GetBoolArg("-usehd", true)) {
+            InitError(strprintf(_("Error creating %s: You can't create non-HD wallets with this version."), walletFile));
+            return nullptr;
+        }
+        walletInstance->SetMinVersion(FEATURE_NO_DEFAULT_KEY);
 
-            // ensure this wallet.dat can only be opened by clients supporting HD with chain split
-            walletInstance->SetMinVersion(FEATURE_HD_SPLIT);
+        // generate a new master key
+        CPubKey masterPubKey = walletInstance->GenerateNewHDMasterKey();
+        if (!walletInstance->SetHDMasterKey(masterPubKey))
+            throw std::runtime_error(std::string(__func__) + ": Storing master key failed");
 
-            // generate a new master key
-            CPubKey masterPubKey = walletInstance->GenerateNewHDMasterKey();
-            if (!walletInstance->SetHDMasterKey(masterPubKey))
-                throw std::runtime_error(std::string(__func__) + ": Storing master key failed");
-        }
-        CPubKey newDefaultKey;
-        if (walletInstance->GetKeyFromPool(newDefaultKey, false)) {
-            walletInstance->SetDefaultKey(newDefaultKey);
-            if (!walletInstance->SetAddressBook(walletInstance->vchDefaultKey.GetID(), "", "receive")) {
-                InitError(_("Cannot write default address") += "\n");
-                return NULL;
-            }
+        // Top up the keypool
+        if (!walletInstance->TopUpKeyPool()) {
+            InitError(_("Unable to generate initial keys") += "\n");
+            return nullptr;
         }
 
         walletInstance->SetBestChain(chainActive.GetLocator());
     }
-    else if (IsArgSet("-usehd")) {
-        bool useHD = GetBoolArg("-usehd", DEFAULT_USE_HD_WALLET);
+    else if (gArgs.IsArgSet("-usehd")) {
+        bool useHD = gArgs.GetBoolArg("-usehd", true);
         if (walletInstance->IsHDEnabled() && !useHD) {
             InitError(strprintf(_("Error loading %s: You can't disable HD on an already existing HD wallet"), walletFile));
-            return NULL;
+            return nullptr;
         }
         if (!walletInstance->IsHDEnabled() && useHD) {
             InitError(strprintf(_("Error loading %s: You can't enable HD on an already existing non-HD wallet"), walletFile));
-            return NULL;
+            return nullptr;
         }
     }
 
@@ -3990,8 +3902,11 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
 
     RegisterValidationInterface(walletInstance);
 
+    // Try to top up keypool. No-op if the wallet is locked.
+    walletInstance->TopUpKeyPool();
+
     CBlockIndex *pindexRescan = chainActive.Genesis();
-    if (!GetBoolArg("-rescan", false))
+    if (!gArgs.GetBoolArg("-rescan", false))
     {
         CWalletDB walletdb(*walletInstance->dbw);
         CBlockLocator locator;
@@ -4011,7 +3926,7 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
 
             if (pindexRescan != block) {
                 InitError(_("Prune: last wallet synchronisation goes beyond pruned data. You need to -reindex (download the whole blockchain again in case of pruned node)"));
-                return NULL;
+                return nullptr;
             }
         }
 
@@ -4025,13 +3940,13 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
         }
 
         nStart = GetTimeMillis();
-        walletInstance->ScanForWalletTransactions(pindexRescan, true);
+        walletInstance->ScanForWalletTransactions(pindexRescan, nullptr, true);
         LogPrintf(" rescan      %15dms\n", GetTimeMillis() - nStart);
         walletInstance->SetBestChain(chainActive.GetLocator());
         walletInstance->dbw->IncrementUpdateCounter();
 
         // Restore wallet transaction metadata after -zapwallettxes=1
-        if (GetBoolArg("-zapwallettxes", false) && GetArg("-zapwallettxes", "1") != "2")
+        if (gArgs.GetBoolArg("-zapwallettxes", false) && gArgs.GetArg("-zapwallettxes", "1") != "2")
         {
             CWalletDB walletdb(*walletInstance->dbw);
 
@@ -4055,7 +3970,7 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
             }
         }
     }
-    walletInstance->SetBroadcastTransactions(GetBoolArg("-walletbroadcast", DEFAULT_WALLETBROADCAST));
+    walletInstance->SetBroadcastTransactions(gArgs.GetBoolArg("-walletbroadcast", DEFAULT_WALLETBROADCAST));
 
     {
         LOCK(walletInstance->cs_wallet);
@@ -4067,24 +3982,6 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
     return walletInstance;
 }
 
-bool CWallet::InitLoadWallet()
-{
-    if (GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
-        LogPrintf("Wallet disabled!\n");
-        return true;
-    }
-
-    for (const std::string& walletFile : gArgs.GetArgs("-wallet")) {
-        CWallet * const pwallet = CreateWalletFromFile(walletFile);
-        if (!pwallet) {
-            return false;
-        }
-        vpwallets.push_back(pwallet);
-    }
-
-    return true;
-}
-
 std::atomic<bool> CWallet::fFlushScheduled(false);
 
 void CWallet::postInitProcess(CScheduler& scheduler)
@@ -4099,126 +3996,6 @@ void CWallet::postInitProcess(CScheduler& scheduler)
     }
 }
 
-bool CWallet::ParameterInteraction()
-{
-    SoftSetArg("-wallet", DEFAULT_WALLET_DAT);
-    const bool is_multiwallet = gArgs.GetArgs("-wallet").size() > 1;
-
-    if (GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET))
-        return true;
-
-    if (GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY) && SoftSetBoolArg("-walletbroadcast", false)) {
-        LogPrintf("%s: parameter interaction: -blocksonly=1 -> setting -walletbroadcast=0\n", __func__);
-    }
-
-    if (GetBoolArg("-salvagewallet", false)) {
-        if (is_multiwallet) {
-            return InitError(strprintf("%s is only allowed with a single wallet file", "-salvagewallet"));
-        }
-        // Rewrite just private keys: rescan to find transactions
-        if (SoftSetBoolArg("-rescan", true)) {
-            LogPrintf("%s: parameter interaction: -salvagewallet=1 -> setting -rescan=1\n", __func__);
-        }
-    }
-
-    int zapwallettxes = GetArg("-zapwallettxes", 0);
-    // -zapwallettxes implies dropping the mempool on startup
-    if (zapwallettxes != 0 && SoftSetBoolArg("-persistmempool", false)) {
-        LogPrintf("%s: parameter interaction: -zapwallettxes=%s -> setting -persistmempool=0\n", __func__, zapwallettxes);
-    }
-
-    // -zapwallettxes implies a rescan
-    if (zapwallettxes != 0) {
-        if (is_multiwallet) {
-            return InitError(strprintf("%s is only allowed with a single wallet file", "-zapwallettxes"));
-        }
-        if (SoftSetBoolArg("-rescan", true)) {
-            LogPrintf("%s: parameter interaction: -zapwallettxes=%s -> setting -rescan=1\n", __func__, zapwallettxes);
-        }
-    }
-
-    if (is_multiwallet) {
-        if (GetBoolArg("-upgradewallet", false)) {
-            return InitError(strprintf("%s is only allowed with a single wallet file", "-upgradewallet"));
-        }
-    }
-
-    if (GetBoolArg("-sysperms", false))
-        return InitError("-sysperms is not allowed in combination with enabled wallet functionality");
-    if (GetArg("-prune", 0) && GetBoolArg("-rescan", false))
-        return InitError(_("Rescans are not possible in pruned mode. You will need to use -reindex which will download the whole blockchain again."));
-
-    if (::minRelayTxFee.GetFeePerK() > HIGH_TX_FEE_PER_KB)
-        InitWarning(AmountHighWarn("-minrelaytxfee") + " " +
-                    _("The wallet will avoid paying less than the minimum relay fee."));
-
-    if (IsArgSet("-mintxfee"))
-    {
-        CAmount n = 0;
-        if (!ParseMoney(GetArg("-mintxfee", ""), n) || 0 == n)
-            return InitError(AmountErrMsg("mintxfee", GetArg("-mintxfee", "")));
-        if (n > HIGH_TX_FEE_PER_KB)
-            InitWarning(AmountHighWarn("-mintxfee") + " " +
-                        _("This is the minimum transaction fee you pay on every transaction."));
-        CWallet::minTxFee = CFeeRate(n);
-    }
-    if (IsArgSet("-fallbackfee"))
-    {
-        CAmount nFeePerK = 0;
-        if (!ParseMoney(GetArg("-fallbackfee", ""), nFeePerK))
-            return InitError(strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'"), GetArg("-fallbackfee", "")));
-        if (nFeePerK > HIGH_TX_FEE_PER_KB)
-            InitWarning(AmountHighWarn("-fallbackfee") + " " +
-                        _("This is the transaction fee you may pay when fee estimates are not available."));
-        CWallet::fallbackFee = CFeeRate(nFeePerK);
-    }
-    if (IsArgSet("-discardfee"))
-    {
-        CAmount nFeePerK = 0;
-        if (!ParseMoney(GetArg("-discardfee", ""), nFeePerK))
-            return InitError(strprintf(_("Invalid amount for -discardfee=<amount>: '%s'"), GetArg("-discardfee", "")));
-        if (nFeePerK > HIGH_TX_FEE_PER_KB)
-            InitWarning(AmountHighWarn("-discardfee") + " " +
-                        _("This is the transaction fee you may discard if change is smaller than dust at this level"));
-        CWallet::m_discard_rate = CFeeRate(nFeePerK);
-    }
-    if (IsArgSet("-paytxfee"))
-    {
-        CAmount nFeePerK = 0;
-        if (!ParseMoney(GetArg("-paytxfee", ""), nFeePerK))
-            return InitError(AmountErrMsg("paytxfee", GetArg("-paytxfee", "")));
-        if (nFeePerK > HIGH_TX_FEE_PER_KB)
-            InitWarning(AmountHighWarn("-paytxfee") + " " +
-                        _("This is the transaction fee you will pay if you send a transaction."));
-
-        payTxFee = CFeeRate(nFeePerK, 1000);
-        if (payTxFee < ::minRelayTxFee)
-        {
-            return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
-                                       GetArg("-paytxfee", ""), ::minRelayTxFee.ToString()));
-        }
-    }
-    if (IsArgSet("-maxtxfee"))
-    {
-        CAmount nMaxFee = 0;
-        if (!ParseMoney(GetArg("-maxtxfee", ""), nMaxFee))
-            return InitError(AmountErrMsg("maxtxfee", GetArg("-maxtxfee", "")));
-        if (nMaxFee > HIGH_MAX_TX_FEE)
-            InitWarning(_("-maxtxfee is set very high! Fees this large could be paid on a single transaction."));
-        maxTxFee = nMaxFee;
-        if (CFeeRate(maxTxFee, 1000) < ::minRelayTxFee)
-        {
-            return InitError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"),
-                                       GetArg("-maxtxfee", ""), ::minRelayTxFee.ToString()));
-        }
-    }
-    nTxConfirmTarget = GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
-    bSpendZeroConfChange = GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
-    fWalletRbf = GetBoolArg("-walletrbf", DEFAULT_WALLET_RBF);
-
-    return true;
-}
-
 bool CWallet::BackupWallet(const std::string& strDest)
 {
     return dbw->Backup(strDest);
@@ -4281,5 +4058,6 @@ int CMerkleTx::GetBlocksToMaturity() const
 
 bool CMerkleTx::AcceptToMemoryPool(const CAmount& nAbsurdFee, CValidationState& state)
 {
-    return ::AcceptToMemoryPool(mempool, state, tx, true, NULL, NULL, false, nAbsurdFee);
+    return ::AcceptToMemoryPool(mempool, state, tx, nullptr /* pfMissingInputs */,
+                                nullptr /* plTxnReplaced */, false /* bypass_limits */, nAbsurdFee);
 }
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 17ac67e1d..c9954555e 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -66,7 +66,7 @@ static const bool DEFAULT_WALLET_RBF = false;
 static const bool DEFAULT_WALLETBROADCAST = true;
 static const bool DEFAULT_DISABLE_WALLET = false;
 //! if set, all keys will be derived by using BIP32
-static const bool DEFAULT_USE_HD_WALLET = false;//true;
+static const bool DEFAULT_USE_HD_WALLET = true;
 
 extern const char * DEFAULT_WALLET_DAT;
 
@@ -87,7 +87,7 @@ enum class FeeEstimateMode;
 /** (client) version numbers for particular wallet features */
 enum WalletFeature
 {
-    FEATURE_BASE = 10500, // the earliest version new wallets supports (only useful for getinfo's clientversion output)
+    FEATURE_BASE = 10500, // the earliest version new wallets supports (only useful for getwalletinfo's clientversion output)
 
     FEATURE_WALLETCRYPT = 40000, // wallet encryption
     FEATURE_COMPRPUBKEY = 60000, // compressed public keys
@@ -96,6 +96,8 @@ enum WalletFeature
 
     FEATURE_HD_SPLIT = 139900, // Wallet with HD chain split (change outputs will use m/0'/1'/k)
 
+    FEATURE_NO_DEFAULT_KEY = 159900, // Wallet without a default key written
+
     FEATURE_LATEST = FEATURE_COMPRPUBKEY // HD is optional, use FEATURE_COMPRPUBKEY as latest version
 };
 
@@ -208,7 +210,7 @@ class CMerkleTx
         Init();
     }
 
-    CMerkleTx(CTransactionRef arg)
+    explicit CMerkleTx(CTransactionRef arg)
     {
         SetTx(std::move(arg));
         Init();
@@ -342,7 +344,7 @@ class CWalletTx : public CMerkleTx
 
     CWalletTx()
     {
-        Init(NULL);
+        Init(nullptr);
     }
 
     CWalletTx(const CWallet* pwalletIn, CTransactionRef arg) : CMerkleTx(std::move(arg))
@@ -386,7 +388,7 @@ class CWalletTx : public CMerkleTx
     template <typename Stream, typename Operation>
     inline void SerializationOp(Stream& s, Operation ser_action) {
         if (ser_action.ForRead())
-            Init(NULL);
+            Init(nullptr);
         char fSpent = false;
 
         if (!ser_action.ForRead())
@@ -548,7 +550,7 @@ class CWalletKey
     //! todo: add something to note what created it (user, getnewaddress, change)
     //!   maybe should have a map<string, string> property map
 
-    CWalletKey(int64_t nExpires=0);
+    explicit CWalletKey(int64_t nExpires=0);
 
     ADD_SERIALIZE_METHODS;
 
@@ -651,7 +653,7 @@ class CAccountingEntry
  * A CWallet is an extension of a keystore, which also maintains a set of transactions and balances,
  * and provides the ability to create new transactions.
  */
-class CWallet : public CCryptoKeyStore, public CValidationInterface
+class CWallet final : public CCryptoKeyStore, public CValidationInterface
 {
 private:
     static std::atomic<bool> fFlushScheduled;
@@ -663,7 +665,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
      * all coins from coinControl are selected; Never select unconfirmed coins
      * if they are not ours
      */
-    bool SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAmount& nTargetValue, std::set<CInputCoin>& setCoinsRet, CAmount& nValueRet, const CCoinControl *coinControl = NULL) const;
+    bool SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAmount& nTargetValue, std::set<CInputCoin>& setCoinsRet, CAmount& nValueRet, const CCoinControl *coinControl = nullptr) const;
 
     CWalletDB *pwalletdbEncryption;
 
@@ -694,7 +696,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
 
     /* Used by TransactionAddedToMemorypool/BlockConnected/Disconnected.
      * Should be called with pindexBlock and posInBlock if this is for a transaction that is included in a block. */
-    void SyncTransaction(const CTransactionRef& tx, const CBlockIndex *pindex = NULL, int posInBlock = 0);
+    void SyncTransaction(const CTransactionRef& tx, const CBlockIndex *pindex = nullptr, int posInBlock = 0);
 
     /* the HD chain data model (external chain counters) */
     CHDChain hdChain;
@@ -705,6 +707,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
     std::set<int64_t> setInternalKeyPool;
     std::set<int64_t> setExternalKeyPool;
     int64_t m_max_keypool_index;
+    std::map<CKeyID, int64_t> m_pool_key_to_index;
 
     int64_t nTimeFirstKey;
 
@@ -747,22 +750,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
         }
     }
 
-    void LoadKeyPool(int64_t nIndex, const CKeyPool &keypool)
-    {
-        if (keypool.fInternal) {
-            setInternalKeyPool.insert(nIndex);
-        } else {
-            setExternalKeyPool.insert(nIndex);
-        }
-        m_max_keypool_index = std::max(m_max_keypool_index, nIndex);
-
-        // If no metadata exists yet, create a default with the pool key's
-        // creation time. Note that this may be overwritten by actually
-        // stored metadata for that key later, which is fine.
-        CKeyID keyid = keypool.vchPubKey.GetID();
-        if (mapKeyMetadata.count(keyid) == 0)
-            mapKeyMetadata[keyid] = CKeyMetadata(keypool.nTime);
-    }
+    void LoadKeyPool(int64_t nIndex, const CKeyPool &keypool);
 
     // Map from Key ID (for regular keys) or Script ID (for watch-only keys) to
     // key metadata.
@@ -779,7 +767,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
     }
 
     // Create wallet with passed-in database handle
-    CWallet(std::unique_ptr<CWalletDBWrapper> dbw_in) : dbw(std::move(dbw_in))
+    explicit CWallet(std::unique_ptr<CWalletDBWrapper> dbw_in) : dbw(std::move(dbw_in))
     {
         SetNull();
     }
@@ -787,7 +775,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
     ~CWallet()
     {
         delete pwalletdbEncryption;
-        pwalletdbEncryption = NULL;
+        pwalletdbEncryption = nullptr;
     }
 
     void SetNull()
@@ -795,7 +783,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
         nWalletVersion = FEATURE_BASE;
         nWalletMaxVersion = FEATURE_BASE;
         nMasterKeyMaxID = 0;
-        pwalletdbEncryption = NULL;
+        pwalletdbEncryption = nullptr;
         nOrderPosNext = 0;
         nAccountingEntryNumber = 0;
         nNextResend = 0;
@@ -821,19 +809,17 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
 
     std::map<CTxDestination, CAddressBookData> mapAddressBook;
 
-    CPubKey vchDefaultKey;
-
     std::set<COutPoint> setLockedCoins;
 
     const CWalletTx* GetWalletTx(const uint256& hash) const;
 
     //! check whether we are allowed to upgrade (or already support) to the named feature
-    bool CanSupportFeature(enum WalletFeature wf) { AssertLockHeld(cs_wallet); return nWalletMaxVersion >= wf; }
+    bool CanSupportFeature(enum WalletFeature wf) const { AssertLockHeld(cs_wallet); return nWalletMaxVersion >= wf; }
 
     /**
      * populate vCoins with vector of available COutputs.
      */
-    void AvailableCoins(std::vector<COutput>& vCoins, bool fOnlySafe=true, const CCoinControl *coinControl = NULL, const CAmount& nMinimumAmount = 1, const CAmount& nMaximumAmount = MAX_MONEY, const CAmount& nMinimumSumAmount = MAX_MONEY, const uint64_t& nMaximumCount = 0, const int& nMinDepth = 0, const int& nMaxDepth = 9999999) const;
+    void AvailableCoins(std::vector<COutput>& vCoins, bool fOnlySafe=true, const CCoinControl *coinControl = nullptr, const CAmount& nMinimumAmount = 1, const CAmount& nMaximumAmount = MAX_MONEY, const CAmount& nMinimumSumAmount = MAX_MONEY, const uint64_t& nMaximumCount = 0, const int& nMinDepth = 0, const int& nMaxDepth = 9999999) const;
 
     /**
      * Return list of available coins and locked coins grouped by non-change output address.
@@ -922,7 +908,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
      * Increment the next transaction order id
      * @return next transaction order id
      */
-    int64_t IncOrderPosNext(CWalletDB *pwalletdb = NULL);
+    int64_t IncOrderPosNext(CWalletDB *pwalletdb = nullptr);
     DBErrors ReorderTransactions();
     bool AccountMove(std::string strFrom, std::string strTo, CAmount nAmount, std::string strComment = "");
     bool GetAccountPubkey(CPubKey &pubKey, std::string strAccount, bool bForceNew = false);
@@ -935,7 +921,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
     void BlockDisconnected(const std::shared_ptr<const CBlock>& pblock) override;
     bool AddToWalletIfInvolvingMe(const CTransactionRef& tx, const CBlockIndex* pIndex, int posInBlock, bool fUpdate);
     int64_t RescanFromTime(int64_t startTime, bool update);
-    CBlockIndex* ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate = false);
+    CBlockIndex* ScanForWalletTransactions(CBlockIndex* pindexStart, CBlockIndex* pindexStop, bool fUpdate = false);
     void ReacceptWalletTransactions();
     void ResendWalletTransactions(int64_t nBestBlockTime, CConnman* connman) override;
     // ResendWalletTransactionsBefore may only be called if fBroadcastTransactions!
@@ -974,26 +960,20 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
     static CFeeRate minTxFee;
     static CFeeRate fallbackFee;
     static CFeeRate m_discard_rate;
-    /**
-     * Estimate the minimum fee considering user set parameters
-     * and the required fee
-     */
-    static CAmount GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc);
-    /**
-     * Return the minimum required fee taking into account the
-     * floating relay fee and user set minimum transaction fee
-     */
-    static CAmount GetRequiredFee(unsigned int nTxBytes);
 
     bool NewKeyPool();
     size_t KeypoolCountExternalKeys();
     bool TopUpKeyPool(unsigned int kpSize = 0);
     void ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool, bool fRequestedInternal);
     void KeepKey(int64_t nIndex);
-    void ReturnKey(int64_t nIndex, bool fInternal);
+    void ReturnKey(int64_t nIndex, bool fInternal, const CPubKey& pubkey);
     bool GetKeyFromPool(CPubKey &key, bool internal = false);
     int64_t GetOldestKeyPoolTime();
-    void GetAllReserveKeys(std::set<CKeyID>& setAddress) const;
+    /**
+     * Marks all keys in the keypool up to and including reserve_key as used.
+     */
+    void MarkReserveKeysAsUsed(int64_t keypool_id);
+    const std::map<CKeyID, int64_t>& GetAllReserveKeys() const { return m_pool_key_to_index; }
 
     std::set< std::set<CTxDestination> > GetAddressGroupings();
     std::map<CTxDestination, CAmount> GetAddressBalances();
@@ -1048,10 +1028,8 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
         return setInternalKeyPool.size() + setExternalKeyPool.size();
     }
 
-    bool SetDefaultKey(const CPubKey &vchPubKey);
-
     //! signify that a particular wallet feature is now used. this may change nWalletVersion and nWalletMaxVersion if those are lower
-    bool SetMinVersion(enum WalletFeature, CWalletDB* pwalletdbIn = NULL, bool fExplicit = false);
+    bool SetMinVersion(enum WalletFeature, CWalletDB* pwalletdbIn = nullptr, bool fExplicit = false);
 
     //! change which version we're allowed to upgrade to (note that this does not immediately imply upgrading to that format)
     bool SetMaxVersion(int nVersion);
@@ -1068,11 +1046,6 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
     //! Flush wallet (bitdb flush)
     void Flush(bool shutdown=false);
 
-    //! Responsible for reading and validating the -wallet arguments and verifying the wallet database.
-    //  This function will perform salvage on the wallet if requested, as long as only one wallet is
-    //  being loaded (CWallet::ParameterInteraction forbids -salvagewallet, -zapwallettxes or -upgradewallet with multiwallet).
-    static bool Verify();
-    
     /** 
      * Address book entry changed.
      * @note called with lock cs_wallet held.
@@ -1109,12 +1082,8 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
     /** Mark a transaction as replaced by another transaction (e.g., BIP 125). */
     bool MarkReplaced(const uint256& originalHash, const uint256& newHash);
 
-    /* Returns the wallets help message */
-    static std::string GetWalletHelpString(bool showDebug);
-
     /* Initializes the wallet, returns a new CWallet instance or a null pointer in case of an error */
     static CWallet* CreateWalletFromFile(const std::string walletFile);
-    static bool InitLoadWallet();
 
     /**
      * Wallet post-init setup
@@ -1122,9 +1091,6 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
      */
     void postInitProcess(CScheduler& scheduler);
 
-    /* Wallets parameter interaction */
-    static bool ParameterInteraction();
-
     bool BackupWallet(const std::string& strDest);
 
     /* Set the HD chain model (chain child index counters) */
@@ -1145,7 +1111,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
 };
 
 /** A key allocated from the key pool. */
-class CReserveKey : public CReserveScript
+class CReserveKey final : public CReserveScript
 {
 protected:
     CWallet* pwallet;
@@ -1153,7 +1119,7 @@ class CReserveKey : public CReserveScript
     CPubKey vchPubKey;
     bool fInternal;
 public:
-    CReserveKey(CWallet* pwalletIn)
+    explicit CReserveKey(CWallet* pwalletIn)
     {
         nIndex = -1;
         pwallet = pwalletIn;
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 65a28af46..b7f873c1e 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -41,9 +41,9 @@ bool CWalletDB::WritePurpose(const std::string& strAddress, const std::string& s
     return WriteIC(std::make_pair(std::string("purpose"), strAddress), strPurpose);
 }
 
-bool CWalletDB::ErasePurpose(const std::string& strPurpose)
+bool CWalletDB::ErasePurpose(const std::string& strAddress)
 {
-    return EraseIC(std::make_pair(std::string("purpose"), strPurpose));
+    return EraseIC(std::make_pair(std::string("purpose"), strAddress));
 }
 
 bool CWalletDB::WriteTx(const CWalletTx& wtx)
@@ -130,11 +130,6 @@ bool CWalletDB::WriteOrderPosNext(int64_t nOrderPosNext)
     return WriteIC(std::string("orderposnext"), nOrderPosNext);
 }
 
-bool CWalletDB::WriteDefaultKey(const CPubKey& vchPubKey)
-{
-    return WriteIC(std::string("defaultkey"), vchPubKey);
-}
-
 bool CWalletDB::ReadPool(int64_t nPool, CKeyPool& keypool)
 {
     return batch.Read(std::make_pair(std::string("pool"), nPool), keypool);
@@ -258,13 +253,13 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
         {
             std::string strAddress;
             ssKey >> strAddress;
-            ssValue >> pwallet->mapAddressBook[CBitcoinAddress(strAddress).Get()].name;
+            ssValue >> pwallet->mapAddressBook[DecodeDestination(strAddress)].name;
         }
         else if (strType == "purpose")
         {
             std::string strAddress;
             ssKey >> strAddress;
-            ssValue >> pwallet->mapAddressBook[CBitcoinAddress(strAddress).Get()].purpose;
+            ssValue >> pwallet->mapAddressBook[DecodeDestination(strAddress)].purpose;
         }
         else if (strType == "tx")
         {
@@ -452,7 +447,14 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
         }
         else if (strType == "defaultkey")
         {
-            ssValue >> pwallet->vchDefaultKey;
+            // We don't want or need the default key, but if there is one set,
+            // we want to make sure that it is valid so that we can detect corruption
+            CPubKey vchPubKey;
+            ssValue >> vchPubKey;
+            if (!vchPubKey.IsValid()) {
+                strErr = "Error reading wallet database: Default Key corrupt";
+                return false;
+            }
         }
         else if (strType == "pool")
         {
@@ -491,7 +493,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             ssKey >> strAddress;
             ssKey >> strKey;
             ssValue >> strValue;
-            if (!pwallet->LoadDestData(CBitcoinAddress(strAddress).Get(), strKey, strValue))
+            if (!pwallet->LoadDestData(DecodeDestination(strAddress), strKey, strValue))
             {
                 strErr = "Error reading wallet database: LoadDestData failed";
                 return false;
@@ -522,7 +524,6 @@ bool CWalletDB::IsKeyType(const std::string& strType)
 
 DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
 {
-    pwallet->vchDefaultKey = CPubKey();
     CWalletScanState wss;
     bool fNoncriticalErrors = false;
     DBErrors result = DB_LOAD_OK;
@@ -565,7 +566,7 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
             {
                 // losing keys is considered a catastrophic error, anything else
                 // we assume the user can live with:
-                if (IsKeyType(strType))
+                if (IsKeyType(strType) || strType == "defaultkey")
                     result = DB_CORRUPT;
                 else
                 {
@@ -573,7 +574,7 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
                     fNoncriticalErrors = true; // ... but do warn the user there is something wrong.
                     if (strType == "tx")
                         // Rescan if there is a bad transaction record:
-                        SoftSetBoolArg("-rescan", true);
+                        gArgs.SoftSetBoolArg("-rescan", true);
                 }
             }
             if (!strErr.empty())
@@ -621,7 +622,7 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
     pwallet->laccentries.clear();
     ListAccountCreditDebit("*", pwallet->laccentries);
     for (CAccountingEntry& entry : pwallet->laccentries) {
-        pwallet->wtxOrdered.insert(make_pair(entry.nOrderPos, CWallet::TxPair((CWalletTx*)0, &entry)));
+        pwallet->wtxOrdered.insert(make_pair(entry.nOrderPos, CWallet::TxPair(nullptr, &entry)));
     }
 
     return result;
@@ -751,7 +752,7 @@ void MaybeCompactWalletDB()
     if (fOneThread.exchange(true)) {
         return;
     }
-    if (!GetBoolArg("-flushwallet", DEFAULT_FLUSHWALLET)) {
+    if (!gArgs.GetBoolArg("-flushwallet", DEFAULT_FLUSHWALLET)) {
         return;
     }
 
@@ -787,7 +788,7 @@ bool CWalletDB::Recover(const std::string& filename, std::string& out_backup_fil
 {
     // recover without a key filter callback
     // results in recovering all record types
-    return CWalletDB::Recover(filename, NULL, NULL, out_backup_filename);
+    return CWalletDB::Recover(filename, nullptr, nullptr, out_backup_filename);
 }
 
 bool CWalletDB::RecoverKeysOnlyFilter(void *callbackData, CDataStream ssKey, CDataStream ssValue)
diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h
index d78f143eb..3a146179a 100644
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -105,7 +105,7 @@ class CKeyMetadata
     {
         SetNull();
     }
-    CKeyMetadata(int64_t nCreateTime_)
+    explicit CKeyMetadata(int64_t nCreateTime_)
     {
         SetNull();
         nCreateTime = nCreateTime_;
@@ -162,11 +162,13 @@ class CWalletDB
     }
 
 public:
-    CWalletDB(CWalletDBWrapper& dbw, const char* pszMode = "r+", bool _fFlushOnClose = true) :
+    explicit CWalletDB(CWalletDBWrapper& dbw, const char* pszMode = "r+", bool _fFlushOnClose = true) :
         batch(dbw, pszMode, _fFlushOnClose),
         m_dbw(dbw)
     {
     }
+    CWalletDB(const CWalletDB&) = delete;
+    CWalletDB& operator=(const CWalletDB&) = delete;
 
     bool WriteName(const std::string& strAddress, const std::string& strName);
     bool EraseName(const std::string& strAddress);
@@ -191,8 +193,6 @@ class CWalletDB
 
     bool WriteOrderPosNext(int64_t nOrderPosNext);
 
-    bool WriteDefaultKey(const CPubKey& vchPubKey);
-
     bool ReadPool(int64_t nPool, CKeyPool& keypool);
     bool WritePool(int64_t nPool, const CKeyPool& keypool);
     bool ErasePool(int64_t nPool);
@@ -246,9 +246,6 @@ class CWalletDB
 private:
     CDB batch;
     CWalletDBWrapper& m_dbw;
-
-    CWalletDB(const CWalletDB&);
-    void operator=(const CWalletDB&);
 };
 
 //! Compacts BDB state so that wallet.dat is self-contained (if there are changes)
diff --git a/src/warnings.cpp b/src/warnings.cpp
index 75ccfeb11..d4e33b701 100644
--- a/src/warnings.cpp
+++ b/src/warnings.cpp
@@ -51,7 +51,7 @@ std::string GetWarnings(const std::string& strFor)
         strGUI = _("This is a pre-release test build - use at your own risk - do not use for mining or merchant applications");
     }
 
-    if (GetBoolArg("-testsafemode", DEFAULT_TESTSAFEMODE))
+    if (gArgs.GetBoolArg("-testsafemode", DEFAULT_TESTSAFEMODE))
         strStatusBar = strRPC = strGUI = "testsafemode enabled";
 
     // Misc warnings like out of disk space and clock is wrong
diff --git a/src/zmq/zmqabstractnotifier.h b/src/zmq/zmqabstractnotifier.h
index 77cf5141e..782882214 100644
--- a/src/zmq/zmqabstractnotifier.h
+++ b/src/zmq/zmqabstractnotifier.h
@@ -15,7 +15,7 @@ typedef CZMQAbstractNotifier* (*CZMQNotifierFactory)();
 class CZMQAbstractNotifier
 {
 public:
-    CZMQAbstractNotifier() : psocket(0) { }
+    CZMQAbstractNotifier() : psocket(nullptr) { }
     virtual ~CZMQAbstractNotifier();
 
     template <typename T>
diff --git a/src/zmq/zmqnotificationinterface.cpp b/src/zmq/zmqnotificationinterface.cpp
index c06389805..9909395d8 100644
--- a/src/zmq/zmqnotificationinterface.cpp
+++ b/src/zmq/zmqnotificationinterface.cpp
@@ -15,7 +15,7 @@ void zmqError(const char *str)
     LogPrint(BCLog::ZMQ, "zmq: Error: %s, errno=%s\n", str, zmq_strerror(errno));
 }
 
-CZMQNotificationInterface::CZMQNotificationInterface() : pcontext(NULL)
+CZMQNotificationInterface::CZMQNotificationInterface() : pcontext(nullptr)
 {
 }
 
@@ -31,7 +31,7 @@ CZMQNotificationInterface::~CZMQNotificationInterface()
 
 CZMQNotificationInterface* CZMQNotificationInterface::Create()
 {
-    CZMQNotificationInterface* notificationInterface = NULL;
+    CZMQNotificationInterface* notificationInterface = nullptr;
     std::map<std::string, CZMQNotifierFactory> factories;
     std::list<CZMQAbstractNotifier*> notifiers;
 
@@ -43,10 +43,10 @@ CZMQNotificationInterface* CZMQNotificationInterface::Create()
     for (std::map<std::string, CZMQNotifierFactory>::const_iterator i=factories.begin(); i!=factories.end(); ++i)
     {
         std::string arg("-zmq" + i->first);
-        if (IsArgSet(arg))
+        if (gArgs.IsArgSet(arg))
         {
             CZMQNotifierFactory factory = i->second;
-            std::string address = GetArg(arg, "");
+            std::string address = gArgs.GetArg(arg, "");
             CZMQAbstractNotifier *notifier = factory();
             notifier->SetType(i->first);
             notifier->SetAddress(address);
@@ -62,7 +62,7 @@ CZMQNotificationInterface* CZMQNotificationInterface::Create()
         if (!notificationInterface->Initialize())
         {
             delete notificationInterface;
-            notificationInterface = NULL;
+            notificationInterface = nullptr;
         }
     }
 
@@ -120,7 +120,7 @@ void CZMQNotificationInterface::Shutdown()
         }
         zmq_ctx_destroy(pcontext);
 
-        pcontext = 0;
+        pcontext = nullptr;
     }
 }
 
diff --git a/src/zmq/zmqnotificationinterface.h b/src/zmq/zmqnotificationinterface.h
index eec6f7bc6..cb92216fa 100644
--- a/src/zmq/zmqnotificationinterface.h
+++ b/src/zmq/zmqnotificationinterface.h
@@ -13,7 +13,7 @@
 class CBlockIndex;
 class CZMQAbstractNotifier;
 
-class CZMQNotificationInterface : public CValidationInterface
+class CZMQNotificationInterface final : public CValidationInterface
 {
 public:
     virtual ~CZMQNotificationInterface();
diff --git a/src/zmq/zmqpublishnotifier.cpp b/src/zmq/zmqpublishnotifier.cpp
index 700c39f66..ab54e2bb8 100644
--- a/src/zmq/zmqpublishnotifier.cpp
+++ b/src/zmq/zmqpublishnotifier.cpp
@@ -126,7 +126,7 @@ void CZMQAbstractPublishNotifier::Shutdown()
         zmq_close(psocket);
     }
 
-    psocket = 0;
+    psocket = nullptr;
 }
 
 bool CZMQAbstractPublishNotifier::SendMessage(const char *command, const void* data, size_t size)
@@ -136,7 +136,7 @@ bool CZMQAbstractPublishNotifier::SendMessage(const char *command, const void* d
     /* send three parts, command & data & a LE 4byte sequence number */
     unsigned char msgseq[sizeof(uint32_t)];
     WriteLE32(&msgseq[0], nSequence);
-    int rc = zmq_send_multipart(psocket, command, strlen(command), data, size, msgseq, (size_t)sizeof(uint32_t), (void*)0);
+    int rc = zmq_send_multipart(psocket, command, strlen(command), data, size, msgseq, (size_t)sizeof(uint32_t), nullptr);
     if (rc == -1)
         return false;
 
diff --git a/test/functional/README.md b/test/functional/README.md
index 44efda33d..2558bd017 100644
--- a/test/functional/README.md
+++ b/test/functional/README.md
@@ -24,8 +24,8 @@ don't have test cases for.
 - Use a module-level docstring to describe what the test is testing, and how it
   is testing it.
 - When subclassing the BitcoinTestFramwork, place overrides for the
-  `__init__()`, and `setup_xxxx()` methods at the top of the subclass, then
-  locally-defined helper methods, then the `run_test()` method.
+  `set_test_params()`, `add_options()` and `setup_xxxx()` methods at the top of
+  the subclass, then locally-defined helper methods, then the `run_test()` method.
 
 #### General test-writing advice
 
@@ -36,7 +36,7 @@ don't have test cases for.
 - Avoid stop-starting the nodes multiple times during the test if possible. A
   stop-start takes several seconds, so doing it several times blows up the
   runtime of the test.
-- Set the `self.setup_clean_chain` variable in `__init__()` to control whether
+- Set the `self.setup_clean_chain` variable in `set_test_params()` to control whether
   or not to use the cached data directories. The cached data directories
   contain a 200-block pre-mined blockchain and wallets for four nodes. Each node
   has 25 mature blocks (25x50=1250 BTC) in its wallet.
diff --git a/test/functional/abandonconflict.py b/test/functional/abandonconflict.py
index c87c02492..e8dbc8646 100755
--- a/test/functional/abandonconflict.py
+++ b/test/functional/abandonconflict.py
@@ -14,10 +14,8 @@
 from test_framework.util import *
 
 class AbandonConflictTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2
-        self.setup_clean_chain = False
         self.extra_args = [["-minrelaytxfee=0.00001"], []]
 
     def run_test(self):
@@ -74,7 +72,7 @@ def run_test(self):
         # Restart the node with a higher min relay fee so the parent tx is no longer in mempool
         # TODO: redo with eviction
         self.stop_node(0)
-        self.nodes[0] = self.start_node(0, self.options.tmpdir, ["-minrelaytxfee=0.0001"])
+        self.start_node(0, extra_args=["-minrelaytxfee=0.0001"])
 
         # Verify txs no longer in either node's mempool
         assert_equal(len(self.nodes[0].getrawmempool()), 0)
@@ -101,7 +99,7 @@ def run_test(self):
 
         # Verify that even with a low min relay fee, the tx is not reaccepted from wallet on startup once abandoned
         self.stop_node(0)
-        self.nodes[0] = self.start_node(0, self.options.tmpdir, ["-minrelaytxfee=0.00001"])
+        self.start_node(0, extra_args=["-minrelaytxfee=0.00001"])
         assert_equal(len(self.nodes[0].getrawmempool()), 0)
         assert_equal(self.nodes[0].getbalance(), balance)
 
@@ -121,7 +119,7 @@ def run_test(self):
 
         # Remove using high relay fee again
         self.stop_node(0)
-        self.nodes[0] = self.start_node(0, self.options.tmpdir, ["-minrelaytxfee=0.0001"])
+        self.start_node(0, extra_args=["-minrelaytxfee=0.0001"])
         assert_equal(len(self.nodes[0].getrawmempool()), 0)
         newbalance = self.nodes[0].getbalance()
         assert_equal(newbalance, balance - Decimal("24.9996"))
diff --git a/test/functional/assumevalid.py b/test/functional/assumevalid.py
index 9d17faac5..65685c48b 100755
--- a/test/functional/assumevalid.py
+++ b/test/functional/assumevalid.py
@@ -54,20 +54,22 @@ def send_header_for_blocks(self, new_blocks):
         self.send_message(headers_message)
 
 class AssumeValidTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
 
     def setup_network(self):
+        self.add_nodes(3)
         # Start node0. We don't start the other nodes yet since
         # we need to pre-mine a block with an invalid transaction
         # signature so we can pass in the block hash as assumevalid.
-        self.nodes = [self.start_node(0, self.options.tmpdir)]
+        self.start_node(0)
 
     def send_blocks_until_disconnected(self, node):
         """Keep sending blocks to the node until we're disconnected."""
         for i in range(len(self.blocks)):
+            if not node.connection:
+                break
             try:
                 node.send_message(msg_block(self.blocks[i]))
             except IOError as e:
@@ -162,15 +164,13 @@ def run_test(self):
             height += 1
 
         # Start node1 and node2 with assumevalid so they accept a block with a bad signature.
-        self.nodes.append(self.start_node(1, self.options.tmpdir,
-                                     ["-assumevalid=" + hex(block102.sha256)]))
+        self.start_node(1, extra_args=["-assumevalid=" + hex(block102.sha256)])
         node1 = BaseNode()  # connects to node1
         connections.append(NodeConn('127.0.0.1', p2p_port(1), self.nodes[1], node1))
         node1.add_connection(connections[1])
         node1.wait_for_verack()
 
-        self.nodes.append(self.start_node(2, self.options.tmpdir,
-                                     ["-assumevalid=" + hex(block102.sha256)]))
+        self.start_node(2, extra_args=["-assumevalid=" + hex(block102.sha256)])
         node2 = BaseNode()  # connects to node2
         connections.append(NodeConn('127.0.0.1', p2p_port(2), self.nodes[2], node2))
         node2.add_connection(connections[2])
diff --git a/test/functional/bip65-cltv-p2p.py b/test/functional/bip65-cltv-p2p.py
index 7e5e4cf68..2cd6df6e3 100755
--- a/test/functional/bip65-cltv-p2p.py
+++ b/test/functional/bip65-cltv-p2p.py
@@ -60,9 +60,7 @@ def create_transaction(node, coinbase, to_address, amount):
     return tx
 
 class BIP65Test(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
         self.extra_args = [['-promiscuousmempoolflags=1', '-whitelist=127.0.0.1']]
         self.setup_clean_chain = True
@@ -109,7 +107,7 @@ def run_test(self):
         node0.send_and_ping(msg_block(block))
         assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
 
-        assert wait_until(lambda: "reject" in node0.last_message.keys())
+        wait_until(lambda: "reject" in node0.last_message.keys(), lock=mininode_lock)
         with mininode_lock:
             assert_equal(node0.last_message["reject"].code, REJECT_OBSOLETE)
             assert_equal(node0.last_message["reject"].reason, b'bad-version(0x00000003)')
@@ -138,7 +136,7 @@ def run_test(self):
         node0.send_and_ping(msg_block(block))
         assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
 
-        assert wait_until (lambda: "reject" in node0.last_message.keys())
+        wait_until(lambda: "reject" in node0.last_message.keys(), lock=mininode_lock)
         with mininode_lock:
             assert node0.last_message["reject"].code in [REJECT_INVALID, REJECT_NONSTANDARD]
             assert_equal(node0.last_message["reject"].data, block.sha256)
diff --git a/test/functional/bip68-112-113-p2p.py b/test/functional/bip68-112-113-p2p.py
index 5a322e8c0..7e6a4f440 100755
--- a/test/functional/bip68-112-113-p2p.py
+++ b/test/functional/bip68-112-113-p2p.py
@@ -92,9 +92,9 @@ def all_rlt_txs(txarray):
     return txs
 
 class BIP68_112_113Test(ComparisonTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
+        self.setup_clean_chain = True
         self.extra_args = [['-whitelist=127.0.0.1', '-blockversion=4']]
 
     def run_test(self):
diff --git a/test/functional/bip68-sequence.py b/test/functional/bip68-sequence.py
index 87a50692f..5f8f21701 100755
--- a/test/functional/bip68-sequence.py
+++ b/test/functional/bip68-sequence.py
@@ -17,10 +17,8 @@
 NOT_FINAL_ERROR = "64: non-BIP68-final"
 
 class BIP68Test(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2
-        self.setup_clean_chain = False
         self.extra_args = [[], ["-acceptnonstdtxn=0"]]
 
     def run_test(self):
@@ -85,7 +83,7 @@ def test_disable_flag(self):
         tx2.vout = [CTxOut(int(value-self.relayfee*COIN), CScript([b'a']))]
         tx2.rehash()
 
-        assert_raises_jsonrpc(-26, NOT_FINAL_ERROR, self.nodes[0].sendrawtransaction, ToHex(tx2))
+        assert_raises_rpc_error(-26, NOT_FINAL_ERROR, self.nodes[0].sendrawtransaction, ToHex(tx2))
 
         # Setting the version back down to 1 should disable the sequence lock,
         # so this should be accepted.
@@ -182,7 +180,7 @@ def test_sequence_lock_confirmed_inputs(self):
 
             if (using_sequence_locks and not should_pass):
                 # This transaction should be rejected
-                assert_raises_jsonrpc(-26, NOT_FINAL_ERROR, self.nodes[0].sendrawtransaction, rawtx)
+                assert_raises_rpc_error(-26, NOT_FINAL_ERROR, self.nodes[0].sendrawtransaction, rawtx)
             else:
                 # This raw transaction should be accepted
                 self.nodes[0].sendrawtransaction(rawtx)
@@ -229,7 +227,7 @@ def test_nonzero_locks(orig_tx, node, relayfee, use_height_lock):
 
             if (orig_tx.hash in node.getrawmempool()):
                 # sendrawtransaction should fail if the tx is in the mempool
-                assert_raises_jsonrpc(-26, NOT_FINAL_ERROR, node.sendrawtransaction, ToHex(tx))
+                assert_raises_rpc_error(-26, NOT_FINAL_ERROR, node.sendrawtransaction, ToHex(tx))
             else:
                 # sendrawtransaction should succeed if the tx is not in the mempool
                 node.sendrawtransaction(ToHex(tx))
@@ -282,7 +280,7 @@ def test_nonzero_locks(orig_tx, node, relayfee, use_height_lock):
         tx5.vout[0].nValue += int(utxos[0]["amount"]*COIN)
         raw_tx5 = self.nodes[0].signrawtransaction(ToHex(tx5))["hex"]
 
-        assert_raises_jsonrpc(-26, NOT_FINAL_ERROR, self.nodes[0].sendrawtransaction, raw_tx5)
+        assert_raises_rpc_error(-26, NOT_FINAL_ERROR, self.nodes[0].sendrawtransaction, raw_tx5)
 
         # Test mempool-BIP68 consistency after reorg
         #
@@ -355,7 +353,7 @@ def test_bip68_not_consensus(self):
         tx3.vout = [CTxOut(int(tx2.vout[0].nValue - self.relayfee*COIN), CScript([b'a']))]
         tx3.rehash()
 
-        assert_raises_jsonrpc(-26, NOT_FINAL_ERROR, self.nodes[0].sendrawtransaction, ToHex(tx3))
+        assert_raises_rpc_error(-26, NOT_FINAL_ERROR, self.nodes[0].sendrawtransaction, ToHex(tx3))
 
         # make a block that violates bip68; ensure that the tip updates
         tip = int(self.nodes[0].getbestblockhash(), 16)
@@ -371,11 +369,14 @@ def test_bip68_not_consensus(self):
 
     def activateCSV(self):
         # activation should happen at block height 432 (3 periods)
+        # getblockchaininfo will show CSV as active at block 431 (144 * 3 -1) since it's returning whether CSV is active for the next block.
         min_activation_height = 432
         height = self.nodes[0].getblockcount()
-        assert(height < min_activation_height)
-        self.nodes[0].generate(min_activation_height-height)
-        assert(get_bip9_status(self.nodes[0], 'csv')['status'] == 'active')
+        assert_greater_than(min_activation_height - height, 2)
+        self.nodes[0].generate(min_activation_height - height - 2)
+        assert_equal(get_bip9_status(self.nodes[0], 'csv')['status'], "locked_in")
+        self.nodes[0].generate(1)
+        assert_equal(get_bip9_status(self.nodes[0], 'csv')['status'], "active")
         sync_blocks(self.nodes)
 
     # Use self.nodes[1] to test that version 2 transactions are standard.
@@ -387,7 +388,7 @@ def test_version2_relay(self):
         tx = FromHex(CTransaction(), rawtxfund)
         tx.nVersion = 2
         tx_signed = self.nodes[1].signrawtransaction(ToHex(tx))["hex"]
-        tx_id = self.nodes[1].sendrawtransaction(tx_signed)
+        self.nodes[1].sendrawtransaction(tx_signed)
 
 if __name__ == '__main__':
     BIP68Test().main()
diff --git a/test/functional/bip9-softforks.py b/test/functional/bip9-softforks.py
index f00232c9f..904789301 100755
--- a/test/functional/bip9-softforks.py
+++ b/test/functional/bip9-softforks.py
@@ -28,11 +28,10 @@
 from test_framework.script import CScript, OP_1NEGATE, OP_CHECKSEQUENCEVERIFY, OP_DROP
 
 class BIP9SoftForksTest(ComparisonTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
         self.extra_args = [['-whitelist=127.0.0.1']]
+        self.setup_clean_chain = True
 
     def run_test(self):
         self.test = TestManager(self, self.options.tmpdir)
@@ -241,6 +240,7 @@ def test_BIP(self, bipName, activated_version, invalidate, invalidatePostSignatu
         # Restart all
         self.test.clear_all_connections()
         self.stop_nodes()
+        self.nodes = []
         shutil.rmtree(self.options.tmpdir + "/node0")
         self.setup_chain()
         self.setup_network()
diff --git a/test/functional/bipdersig-p2p.py b/test/functional/bipdersig-p2p.py
index 38a900954..c620d3e15 100755
--- a/test/functional/bipdersig-p2p.py
+++ b/test/functional/bipdersig-p2p.py
@@ -48,9 +48,7 @@ def create_transaction(node, coinbase, to_address, amount):
     return tx
 
 class BIP66Test(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
         self.extra_args = [['-promiscuousmempoolflags=1', '-whitelist=127.0.0.1']]
         self.setup_clean_chain = True
@@ -98,7 +96,7 @@ def run_test(self):
         node0.send_and_ping(msg_block(block))
         assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
 
-        assert wait_until(lambda: "reject" in node0.last_message.keys())
+        wait_until(lambda: "reject" in node0.last_message.keys(), lock=mininode_lock)
         with mininode_lock:
             assert_equal(node0.last_message["reject"].code, REJECT_OBSOLETE)
             assert_equal(node0.last_message["reject"].reason, b'bad-version(0x00000002)')
@@ -128,7 +126,7 @@ def run_test(self):
         node0.send_and_ping(msg_block(block))
         assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
 
-        assert wait_until (lambda: "reject" in node0.last_message.keys())
+        wait_until(lambda: "reject" in node0.last_message.keys(), lock=mininode_lock)
         with mininode_lock:
             # We can receive different reject messages depending on whether
             # bitcoind is running with multiple script check threads. If script
diff --git a/test/functional/bitcoin_cli.py b/test/functional/bitcoin_cli.py
new file mode 100755
index 000000000..996cbb8a1
--- /dev/null
+++ b/test/functional/bitcoin_cli.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test bitcoin-cli"""
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal, assert_raises_process_error, get_auth_cookie
+
+class TestBitcoinCli(BitcoinTestFramework):
+
+    def set_test_params(self):
+        self.setup_clean_chain = True
+        self.num_nodes = 1
+
+    def run_test(self):
+        """Main test logic"""
+
+        self.log.info("Compare responses from gewalletinfo RPC and `bitcoin-cli getwalletinfo`")
+        cli_response = self.nodes[0].cli.getwalletinfo()
+        rpc_response = self.nodes[0].getwalletinfo()
+        assert_equal(cli_response, rpc_response)
+
+        self.log.info("Compare responses from getblockchaininfo RPC and `bitcoin-cli getblockchaininfo`")
+        cli_response = self.nodes[0].cli.getblockchaininfo()
+        rpc_response = self.nodes[0].getblockchaininfo()
+        assert_equal(cli_response, rpc_response)
+
+        user, password = get_auth_cookie(self.nodes[0].datadir)
+
+        self.log.info("Test -stdinrpcpass option")
+        assert_equal(0, self.nodes[0].cli('-rpcuser=%s' % user, '-stdinrpcpass', input=password).getblockcount())
+        assert_raises_process_error(1, "incorrect rpcuser or rpcpassword", self.nodes[0].cli('-rpcuser=%s' % user, '-stdinrpcpass', input="foo").echo)
+
+        self.log.info("Test -stdin and -stdinrpcpass")
+        assert_equal(["foo", "bar"], self.nodes[0].cli('-rpcuser=%s' % user, '-stdin', '-stdinrpcpass', input=password + "\nfoo\nbar").echo())
+        assert_raises_process_error(1, "incorrect rpcuser or rpcpassword", self.nodes[0].cli('-rpcuser=%s' % user, '-stdin', '-stdinrpcpass', input="foo").echo)
+
+        self.log.info("Compare responses from `bitcoin-cli -getinfo` and the RPCs data is retrieved from.")
+        cli_get_info = self.nodes[0].cli('-getinfo').help()
+        wallet_info = self.nodes[0].getwalletinfo()
+        network_info = self.nodes[0].getnetworkinfo()
+        blockchain_info = self.nodes[0].getblockchaininfo()
+
+        assert_equal(cli_get_info['version'], network_info['version'])
+        assert_equal(cli_get_info['protocolversion'], network_info['protocolversion'])
+        assert_equal(cli_get_info['walletversion'], wallet_info['walletversion'])
+        assert_equal(cli_get_info['balance'], wallet_info['balance'])
+        assert_equal(cli_get_info['blocks'], blockchain_info['blocks'])
+        assert_equal(cli_get_info['timeoffset'], network_info['timeoffset'])
+        assert_equal(cli_get_info['connections'], network_info['connections'])
+        assert_equal(cli_get_info['proxy'], network_info['networks'][0]['proxy'])
+        assert_equal(cli_get_info['difficulty'], blockchain_info['difficulty'])
+        assert_equal(cli_get_info['testnet'], blockchain_info['chain'] == "test")
+        assert_equal(cli_get_info['balance'], wallet_info['balance'])
+        assert_equal(cli_get_info['keypoololdest'], wallet_info['keypoololdest'])
+        assert_equal(cli_get_info['keypoolsize'], wallet_info['keypoolsize'])
+        assert_equal(cli_get_info['paytxfee'], wallet_info['paytxfee'])
+        assert_equal(cli_get_info['relayfee'], network_info['relayfee'])
+        # unlocked_until is not tested because the wallet is not encrypted
+
+if __name__ == '__main__':
+    TestBitcoinCli().main()
diff --git a/test/functional/blockchain.py b/test/functional/blockchain.py
index a7034e6bc..4576cb036 100755
--- a/test/functional/blockchain.py
+++ b/test/functional/blockchain.py
@@ -21,25 +21,24 @@
 import http.client
 import subprocess
 
-from test_framework.test_framework import (BitcoinTestFramework, BITCOIND_PROC_WAIT_TIMEOUT)
+from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
+    assert_greater_than,
+    assert_greater_than_or_equal,
     assert_raises,
-    assert_raises_jsonrpc,
+    assert_raises_rpc_error,
     assert_is_hex_string,
     assert_is_hash_string,
 )
 
-
 class BlockchainTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = False
+    def set_test_params(self):
         self.num_nodes = 1
-        self.extra_args = [['-stopatheight=207']]
+        self.extra_args = [['-stopatheight=207', '-prune=1']]
 
     def run_test(self):
+        self._test_getblockchaininfo()
         self._test_getchaintxstats()
         self._test_gettxoutsetinfo()
         self._test_getblockheader()
@@ -48,6 +47,56 @@ def run_test(self):
         self._test_stopatheight()
         assert self.nodes[0].verifychain(4, 0)
 
+    def _test_getblockchaininfo(self):
+        self.log.info("Test getblockchaininfo")
+
+        keys = [
+            'bestblockhash',
+            'bip9_softforks',
+            'blocks',
+            'chain',
+            'chainwork',
+            'difficulty',
+            'headers',
+            'mediantime',
+            'pruned',
+            'size_on_disk',
+            'softforks',
+            'verificationprogress',
+            'warnings',
+        ]
+        res = self.nodes[0].getblockchaininfo()
+
+        # result should have these additional pruning keys if manual pruning is enabled
+        assert_equal(sorted(res.keys()), sorted(['pruneheight', 'automatic_pruning'] + keys))
+
+        # size_on_disk should be > 0
+        assert_greater_than(res['size_on_disk'], 0)
+
+        # pruneheight should be greater or equal to 0
+        assert_greater_than_or_equal(res['pruneheight'], 0)
+
+        # check other pruning fields given that prune=1
+        assert res['pruned']
+        assert not res['automatic_pruning']
+
+        self.restart_node(0, ['-stopatheight=207'])
+        res = self.nodes[0].getblockchaininfo()
+        # should have exact keys
+        assert_equal(sorted(res.keys()), keys)
+
+        self.restart_node(0, ['-stopatheight=207', '-prune=550'])
+        res = self.nodes[0].getblockchaininfo()
+        # result should have these additional pruning keys if prune=550
+        assert_equal(sorted(res.keys()), sorted(['pruneheight', 'automatic_pruning', 'prune_target_size'] + keys))
+
+        # check related fields
+        assert res['pruned']
+        assert_equal(res['pruneheight'], 0)
+        assert res['automatic_pruning']
+        assert_equal(res['prune_target_size'], 576716800)
+        assert_greater_than(res['size_on_disk'], 0)
+
     def _test_getchaintxstats(self):
         chaintxstats = self.nodes[0].getchaintxstats(1)
         # 200 txs plus genesis tx
@@ -56,6 +105,28 @@ def _test_getchaintxstats(self):
         # we have to round because of binary math
         assert_equal(round(chaintxstats['txrate'] * 600, 10), Decimal(1))
 
+        b1 = self.nodes[0].getblock(self.nodes[0].getblockhash(1))
+        b200 = self.nodes[0].getblock(self.nodes[0].getblockhash(200))
+        time_diff = b200['mediantime'] - b1['mediantime']
+
+        chaintxstats = self.nodes[0].getchaintxstats()
+        assert_equal(chaintxstats['time'], b200['time'])
+        assert_equal(chaintxstats['txcount'], 201)
+        assert_equal(chaintxstats['window_block_count'], 199)
+        assert_equal(chaintxstats['window_tx_count'], 199)
+        assert_equal(chaintxstats['window_interval'], time_diff)
+        assert_equal(round(chaintxstats['txrate'] * time_diff, 10), Decimal(199))
+
+        chaintxstats = self.nodes[0].getchaintxstats(blockhash=b1['hash'])
+        assert_equal(chaintxstats['time'], b1['time'])
+        assert_equal(chaintxstats['txcount'], 2)
+        assert_equal(chaintxstats['window_block_count'], 0)
+        assert('window_tx_count' not in chaintxstats)
+        assert('window_interval' not in chaintxstats)
+        assert('txrate' not in chaintxstats)
+
+        assert_raises_rpc_error(-8, "Invalid block count: should be between 0 and the block's height - 1", self.nodes[0].getchaintxstats, 201)
+
     def _test_gettxoutsetinfo(self):
         node = self.nodes[0]
         res = node.gettxoutsetinfo()
@@ -100,7 +171,7 @@ def _test_gettxoutsetinfo(self):
     def _test_getblockheader(self):
         node = self.nodes[0]
 
-        assert_raises_jsonrpc(-5, "Block not found",
+        assert_raises_rpc_error(-5, "Block not found",
                               node.getblockheader, "nonsense")
 
         besthash = node.getbestblockhash()
@@ -139,14 +210,14 @@ def _test_stopatheight(self):
         self.nodes[0].generate(6)
         assert_equal(self.nodes[0].getblockcount(), 206)
         self.log.debug('Node should not stop at this height')
-        assert_raises(subprocess.TimeoutExpired, lambda: self.bitcoind_processes[0].wait(timeout=3))
+        assert_raises(subprocess.TimeoutExpired, lambda: self.nodes[0].process.wait(timeout=3))
         try:
             self.nodes[0].generate(1)
         except (ConnectionError, http.client.BadStatusLine):
             pass  # The node already shut down before response
         self.log.debug('Node should stop at this height...')
-        self.bitcoind_processes[0].wait(timeout=BITCOIND_PROC_WAIT_TIMEOUT)
-        self.nodes[0] = self.start_node(0, self.options.tmpdir)
+        self.nodes[0].wait_until_stopped()
+        self.start_node(0)
         assert_equal(self.nodes[0].getblockcount(), 207)
 
 
diff --git a/test/functional/bumpfee.py b/test/functional/bumpfee.py
index 9237f0924..008e83d5b 100755
--- a/test/functional/bumpfee.py
+++ b/test/functional/bumpfee.py
@@ -30,26 +30,21 @@
 
 
 class BumpFeeTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2
         self.setup_clean_chain = True
+        self.extra_args = [["-prematurewitness", "-walletprematurewitness", "-walletrbf={}".format(i)]
+                           for i in range(self.num_nodes)]
 
-    def setup_network(self, split=False):
-        extra_args = [["-prematurewitness", "-walletprematurewitness", "-walletrbf={}".format(i)]
-                      for i in range(self.num_nodes)]
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, extra_args)
-
+    def run_test(self):
         # Encrypt wallet for test_locked_wallet_fails test
-        self.nodes[1].encryptwallet(WALLET_PASSPHRASE)
-        self.bitcoind_processes[1].wait()
-        self.nodes[1] = self.start_node(1, self.options.tmpdir, extra_args[1])
+        self.nodes[1].node_encrypt_wallet(WALLET_PASSPHRASE)
+        self.start_node(1)
         self.nodes[1].walletpassphrase(WALLET_PASSPHRASE, WALLET_PASSPHRASE_TIMEOUT)
 
         connect_nodes_bi(self.nodes, 0, 1)
         self.sync_all()
 
-    def run_test(self):
         peer_node, rbf_node = self.nodes
         rbf_node_address = rbf_node.getnewaddress()
 
@@ -90,7 +85,7 @@ def test_simple_bumpfee_succeeds(rbf_node, peer_node, dest_address):
     bumped_tx = rbf_node.bumpfee(rbfid)
     assert_equal(bumped_tx["errors"], [])
     assert bumped_tx["fee"] - abs(rbftx["fee"]) > 0
-    # check that bumped_tx propogates, original tx was evicted and has a wallet conflict
+    # check that bumped_tx propagates, original tx was evicted and has a wallet conflict
     sync_mempools((rbf_node, peer_node))
     assert bumped_tx["txid"] in rbf_node.getrawmempool()
     assert bumped_tx["txid"] in peer_node.getrawmempool()
@@ -138,7 +133,7 @@ def test_segwit_bumpfee_succeeds(rbf_node, dest_address):
 def test_nonrbf_bumpfee_fails(peer_node, dest_address):
     # cannot replace a non RBF transaction (from node which did not enable RBF)
     not_rbfid = peer_node.sendtoaddress(dest_address, Decimal("0.00090000"))
-    assert_raises_jsonrpc(-4, "not BIP 125 replaceable", peer_node.bumpfee, not_rbfid)
+    assert_raises_rpc_error(-4, "not BIP 125 replaceable", peer_node.bumpfee, not_rbfid)
 
 
 def test_notmine_bumpfee_fails(rbf_node, peer_node, dest_address):
@@ -158,7 +153,7 @@ def test_notmine_bumpfee_fails(rbf_node, peer_node, dest_address):
     signedtx = rbf_node.signrawtransaction(rawtx)
     signedtx = peer_node.signrawtransaction(signedtx["hex"])
     rbfid = rbf_node.sendrawtransaction(signedtx["hex"])
-    assert_raises_jsonrpc(-4, "Transaction contains inputs that don't belong to this wallet",
+    assert_raises_rpc_error(-4, "Transaction contains inputs that don't belong to this wallet",
                           rbf_node.bumpfee, rbfid)
 
 
@@ -168,8 +163,8 @@ def test_bumpfee_with_descendant_fails(rbf_node, rbf_node_address, dest_address)
     parent_id = spend_one_input(rbf_node, rbf_node_address)
     tx = rbf_node.createrawtransaction([{"txid": parent_id, "vout": 0}], {dest_address: 0.00020000})
     tx = rbf_node.signrawtransaction(tx)
-    txid = rbf_node.sendrawtransaction(tx["hex"])
-    assert_raises_jsonrpc(-8, "Transaction has descendants in the wallet", rbf_node.bumpfee, parent_id)
+    rbf_node.sendrawtransaction(tx["hex"])
+    assert_raises_rpc_error(-8, "Transaction has descendants in the wallet", rbf_node.bumpfee, parent_id)
 
 
 def test_small_output_fails(rbf_node, dest_address):
@@ -178,7 +173,7 @@ def test_small_output_fails(rbf_node, dest_address):
     rbf_node.bumpfee(rbfid, {"totalFee": 50000})
 
     rbfid = spend_one_input(rbf_node, dest_address)
-    assert_raises_jsonrpc(-4, "Change output is too small", rbf_node.bumpfee, rbfid, {"totalFee": 50001})
+    assert_raises_rpc_error(-4, "Change output is too small", rbf_node.bumpfee, rbfid, {"totalFee": 50001})
 
 
 def test_dust_to_fee(rbf_node, dest_address):
@@ -210,7 +205,7 @@ def test_rebumping(rbf_node, dest_address):
     # check that re-bumping the original tx fails, but bumping the bumper succeeds
     rbfid = spend_one_input(rbf_node, dest_address)
     bumped = rbf_node.bumpfee(rbfid, {"totalFee": 2000})
-    assert_raises_jsonrpc(-4, "already bumped", rbf_node.bumpfee, rbfid, {"totalFee": 3000})
+    assert_raises_rpc_error(-4, "already bumped", rbf_node.bumpfee, rbfid, {"totalFee": 3000})
     rbf_node.bumpfee(bumped["txid"], {"totalFee": 3000})
 
 
@@ -218,7 +213,7 @@ def test_rebumping_not_replaceable(rbf_node, dest_address):
     # check that re-bumping a non-replaceable bump tx fails
     rbfid = spend_one_input(rbf_node, dest_address)
     bumped = rbf_node.bumpfee(rbfid, {"totalFee": 10000, "replaceable": False})
-    assert_raises_jsonrpc(-4, "Transaction is not BIP 125 replaceable", rbf_node.bumpfee, bumped["txid"],
+    assert_raises_rpc_error(-4, "Transaction is not BIP 125 replaceable", rbf_node.bumpfee, bumped["txid"],
                           {"totalFee": 20000})
 
 
@@ -269,7 +264,7 @@ def test_bumpfee_metadata(rbf_node, dest_address):
 def test_locked_wallet_fails(rbf_node, dest_address):
     rbfid = spend_one_input(rbf_node, dest_address)
     rbf_node.walletlock()
-    assert_raises_jsonrpc(-13, "Please enter the wallet passphrase with walletpassphrase first.",
+    assert_raises_rpc_error(-13, "Please enter the wallet passphrase with walletpassphrase first.",
                           rbf_node.bumpfee, rbfid)
 
 
diff --git a/test/functional/create_cache.py b/test/functional/create_cache.py
index 39c4c0f47..7d4d1a529 100755
--- a/test/functional/create_cache.py
+++ b/test/functional/create_cache.py
@@ -12,13 +12,10 @@
 from test_framework.test_framework import BitcoinTestFramework
 
 class CreateCache(BitcoinTestFramework):
+    # Test network and test nodes are not required:
 
-    def __init__(self):
-        super().__init__()
-
-        # Test network and test nodes are not required:
+    def set_test_params(self):
         self.num_nodes = 0
-        self.nodes = []
 
     def setup_network(self):
         pass
diff --git a/test/functional/dbcrash.py b/test/functional/dbcrash.py
index 8339305f5..24b9765b4 100755
--- a/test/functional/dbcrash.py
+++ b/test/functional/dbcrash.py
@@ -43,8 +43,7 @@
     pass
 
 class ChainstateWriteCrashTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 4
         self.setup_clean_chain = False
 
@@ -64,7 +63,9 @@ def __init__(self):
         self.extra_args = [self.node0_args, self.node1_args, self.node2_args, self.node3_args]
 
     def setup_network(self):
-        self.setup_nodes()
+        # Need a bit of extra time for the nodes to start up for this test
+        self.add_nodes(self.num_nodes, extra_args=self.extra_args, timewait=90)
+        self.start_nodes()
         # Leave them unconnected, we'll use submitblock directly in this test
 
     def restart_node(self, node_index, expected_tip):
@@ -74,10 +75,10 @@ def restart_node(self, node_index, expected_tip):
         after 60 seconds. Returns the utxo hash of the given node."""
 
         time_start = time.time()
-        while time.time() - time_start < 60:
+        while time.time() - time_start < 120:
             try:
                 # Any of these RPC calls could throw due to node crash
-                self.nodes[node_index] = self.start_node(node_index, self.options.tmpdir, self.extra_args[node_index])
+                self.start_node(node_index)
                 self.nodes[node_index].waitforblock(expected_tip)
                 utxo_hash = self.nodes[node_index].gettxoutsetinfo()['hash_serialized_2']
                 return utxo_hash
diff --git a/test/functional/decodescript.py b/test/functional/decodescript.py
index 21a9f1223..6611da883 100755
--- a/test/functional/decodescript.py
+++ b/test/functional/decodescript.py
@@ -10,9 +10,7 @@
 from io import BytesIO
 
 class DecodeScriptTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
 
diff --git a/test/functional/deprecated_rpc.py b/test/functional/deprecated_rpc.py
new file mode 100755
index 000000000..19fd24edb
--- /dev/null
+++ b/test/functional/deprecated_rpc.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test deprecation of RPC calls."""
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_raises_rpc_error
+
+class DeprecatedRpcTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 2
+        self.setup_clean_chain = True
+        self.extra_args = [[], ["-deprecatedrpc=estimatefee"]]
+
+    def run_test(self):
+        self.log.info("estimatefee: Shows deprecated message")
+        assert_raises_rpc_error(-32, 'estimatefee is deprecated', self.nodes[0].estimatefee, 1)
+
+        self.log.info("Using -deprecatedrpc=estimatefee bypasses the error")
+        self.nodes[1].estimatefee(1)
+
+if __name__ == '__main__':
+    DeprecatedRpcTest().main()
diff --git a/test/functional/disablewallet.py b/test/functional/disablewallet.py
index d34451341..c75ef9b9f 100755
--- a/test/functional/disablewallet.py
+++ b/test/functional/disablewallet.py
@@ -11,18 +11,15 @@
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import *
 
-
 class DisableWalletTest (BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
         self.extra_args = [["-disablewallet"]]
 
     def run_test (self):
         # Make sure wallet is really disabled
-        assert_raises_jsonrpc(-32601, 'Method not found', self.nodes[0].getwalletinfo)
+        assert_raises_rpc_error(-32601, 'Method not found', self.nodes[0].getwalletinfo)
         x = self.nodes[0].validateaddress('3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy')
         assert(x['isvalid'] == False)
         x = self.nodes[0].validateaddress('mneYUmWYsuk7kySiURxCi3AGxrAqZxLgPZ')
@@ -31,7 +28,7 @@ def run_test (self):
         # Checking mining to an address without a wallet. Generating to a valid address should succeed
         # but generating to an invalid address will fail.
         self.nodes[0].generatetoaddress(1, 'mneYUmWYsuk7kySiURxCi3AGxrAqZxLgPZ')
-        assert_raises_jsonrpc(-5, "Invalid address", self.nodes[0].generatetoaddress, 1, '3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy')
+        assert_raises_rpc_error(-5, "Invalid address", self.nodes[0].generatetoaddress, 1, '3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy')
 
 if __name__ == '__main__':
     DisableWalletTest ().main ()
diff --git a/test/functional/disconnect_ban.py b/test/functional/disconnect_ban.py
index 89b68aeb2..59655d37f 100755
--- a/test/functional/disconnect_ban.py
+++ b/test/functional/disconnect_ban.py
@@ -5,18 +5,17 @@
 """Test node disconnect and ban behavior"""
 import time
 
-from test_framework.mininode import wait_until
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import (assert_equal,
-                                 assert_raises_jsonrpc,
-                                 connect_nodes_bi)
+from test_framework.util import (
+    assert_equal,
+    assert_raises_rpc_error,
+    connect_nodes_bi,
+    wait_until,
+)
 
 class DisconnectBanTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2
-        self.setup_clean_chain = False
 
     def run_test(self):
         self.log.info("Test setban and listbanned RPCs")
@@ -24,7 +23,7 @@ def run_test(self):
         self.log.info("setban: successfully ban single IP address")
         assert_equal(len(self.nodes[1].getpeerinfo()), 2)  # node1 should have 2 connections to node0 at this point
         self.nodes[1].setban("127.0.0.1", "add")
-        assert wait_until(lambda: len(self.nodes[1].getpeerinfo()) == 0, timeout=10)
+        wait_until(lambda: len(self.nodes[1].getpeerinfo()) == 0, timeout=10)
         assert_equal(len(self.nodes[1].getpeerinfo()), 0)  # all nodes must be disconnected at this point
         assert_equal(len(self.nodes[1].listbanned()), 1)
 
@@ -35,14 +34,14 @@ def run_test(self):
 
         self.log.info("setban: fail to ban an already banned subnet")
         assert_equal(len(self.nodes[1].listbanned()), 1)
-        assert_raises_jsonrpc(-23, "IP/Subnet already banned", self.nodes[1].setban, "127.0.0.1", "add")
+        assert_raises_rpc_error(-23, "IP/Subnet already banned", self.nodes[1].setban, "127.0.0.1", "add")
 
         self.log.info("setban: fail to ban an invalid subnet")
-        assert_raises_jsonrpc(-30, "Error: Invalid IP/Subnet", self.nodes[1].setban, "127.0.0.1/42", "add")
+        assert_raises_rpc_error(-30, "Error: Invalid IP/Subnet", self.nodes[1].setban, "127.0.0.1/42", "add")
         assert_equal(len(self.nodes[1].listbanned()), 1)  # still only one banned ip because 127.0.0.1 is within the range of 127.0.0.0/24
 
         self.log.info("setban remove: fail to unban a non-banned subnet")
-        assert_raises_jsonrpc(-30, "Error: Unban failed", self.nodes[1].setban, "127.0.0.1", "remove")
+        assert_raises_rpc_error(-30, "Error: Unban failed", self.nodes[1].setban, "127.0.0.1", "remove")
         assert_equal(len(self.nodes[1].listbanned()), 1)
 
         self.log.info("setban remove: successfully unban subnet")
@@ -66,8 +65,8 @@ def run_test(self):
         assert_equal(len(self.nodes[1].listbanned()), 3)
 
         self.stop_node(1)
+        self.start_node(1)
 
-        self.nodes[1] = self.start_node(1, self.options.tmpdir)
         listAfterShutdown = self.nodes[1].listbanned()
         assert_equal("127.0.0.0/24", listAfterShutdown[0]['address'])
         assert_equal("127.0.0.0/32", listAfterShutdown[1]['address'])
@@ -82,15 +81,15 @@ def run_test(self):
         self.log.info("disconnectnode: fail to disconnect when calling with address and nodeid")
         address1 = self.nodes[0].getpeerinfo()[0]['addr']
         node1 = self.nodes[0].getpeerinfo()[0]['addr']
-        assert_raises_jsonrpc(-32602, "Only one of address and nodeid should be provided.", self.nodes[0].disconnectnode, address=address1, nodeid=node1)
+        assert_raises_rpc_error(-32602, "Only one of address and nodeid should be provided.", self.nodes[0].disconnectnode, address=address1, nodeid=node1)
 
         self.log.info("disconnectnode: fail to disconnect when calling with junk address")
-        assert_raises_jsonrpc(-29, "Node not found in connected nodes", self.nodes[0].disconnectnode, address="221B Baker Street")
+        assert_raises_rpc_error(-29, "Node not found in connected nodes", self.nodes[0].disconnectnode, address="221B Baker Street")
 
         self.log.info("disconnectnode: successfully disconnect node by address")
         address1 = self.nodes[0].getpeerinfo()[0]['addr']
         self.nodes[0].disconnectnode(address=address1)
-        assert wait_until(lambda: len(self.nodes[0].getpeerinfo()) == 1, timeout=10)
+        wait_until(lambda: len(self.nodes[0].getpeerinfo()) == 1, timeout=10)
         assert not [node for node in self.nodes[0].getpeerinfo() if node['addr'] == address1]
 
         self.log.info("disconnectnode: successfully reconnect node")
@@ -101,7 +100,7 @@ def run_test(self):
         self.log.info("disconnectnode: successfully disconnect node by node id")
         id1 = self.nodes[0].getpeerinfo()[0]['id']
         self.nodes[0].disconnectnode(nodeid=id1)
-        assert wait_until(lambda: len(self.nodes[0].getpeerinfo()) == 1, timeout=10)
+        wait_until(lambda: len(self.nodes[0].getpeerinfo()) == 1, timeout=10)
         assert not [node for node in self.nodes[0].getpeerinfo() if node['id'] == id1]
 
 if __name__ == '__main__':
diff --git a/test/functional/example_test.py b/test/functional/example_test.py
index 1ba5f756c..87d73ad14 100755
--- a/test/functional/example_test.py
+++ b/test/functional/example_test.py
@@ -23,13 +23,13 @@
     mininode_lock,
     msg_block,
     msg_getdata,
-    wait_until,
 )
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
     connect_nodes,
     p2p_port,
+    wait_until,
 )
 
 # NodeConnCB is a class containing callbacks to be executed when a P2P
@@ -58,6 +58,10 @@ def on_block(self, conn, message):
         message.block.calc_sha256()
         self.block_receive_map[message.block.sha256] += 1
 
+    def on_inv(self, conn, message):
+        """Override the standard on_inv callback"""
+        pass
+
 def custom_function():
     """Do some custom behaviour
 
@@ -69,21 +73,19 @@ def custom_function():
 class ExampleTest(BitcoinTestFramework):
     # Each functional test is a subclass of the BitcoinTestFramework class.
 
-    # Override the __init__(), add_options(), setup_chain(), setup_network()
+    # Override the set_test_params(), add_options(), setup_chain(), setup_network()
     # and setup_nodes() methods to customize the test setup as required.
 
-    def __init__(self):
-        """Initialize the test
+    def set_test_params(self):
+        """Override test parameters for your individual test.
 
-        Call super().__init__() first, and then override any test parameters
-        for your individual test."""
-        super().__init__()
+        This method must be overridden and num_nodes must be exlicitly set."""
         self.setup_clean_chain = True
         self.num_nodes = 3
         # Use self.extra_args to change command-line arguments for the nodes
         self.extra_args = [[], ["-logips"], []]
 
-        # self.log.info("I've finished __init__")  # Oops! Can't run self.log before run_test()
+        # self.log.info("I've finished set_test_params")  # Oops! Can't run self.log before run_test()
 
     # Use add_options() to add specific command-line options for your test.
     # In practice this is not used very much, since the tests are mostly written
@@ -196,16 +198,16 @@ def run_test(self):
         node2.add_connection(connections[1])
         node2.wait_for_verack()
 
-        self.log.info("Wait for node2 reach current tip. Test that it has propogated all the blocks to us")
+        self.log.info("Wait for node2 reach current tip. Test that it has propagated all the blocks to us")
 
+        getdata_request = msg_getdata()
         for block in blocks:
-            getdata_request = msg_getdata()
             getdata_request.inv.append(CInv(2, block))
-            node2.send_message(getdata_request)
+        node2.send_message(getdata_request)
 
         # wait_until() will loop until a predicate condition is met. Use it to test properties of the
         # NodeConnCB objects.
-        assert wait_until(lambda: sorted(blocks) == sorted(list(node2.block_receive_map.keys())), timeout=5)
+        wait_until(lambda: sorted(blocks) == sorted(list(node2.block_receive_map.keys())), timeout=5, lock=mininode_lock)
 
         self.log.info("Check that each block was received only once")
         # The network thread uses a global lock on data access to the NodeConn objects when sending and receiving
diff --git a/test/functional/forknotify.py b/test/functional/forknotify.py
deleted file mode 100755
index 3bcf0a679..000000000
--- a/test/functional/forknotify.py
+++ /dev/null
@@ -1,69 +0,0 @@
-#!/usr/bin/env python3
-# Copyright (c) 2014-2016 The Bitcoin Core developers
-# Distributed under the MIT software license, see the accompanying
-# file COPYING or http://www.opensource.org/licenses/mit-license.php.
-"""Test the -alertnotify option."""
-import os
-import time
-
-from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
-
-class ForkNotifyTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        self.num_nodes = 2
-        self.setup_clean_chain = False
-
-    def setup_network(self):
-        self.nodes = []
-        self.alert_filename = os.path.join(self.options.tmpdir, "alert.txt")
-        with open(self.alert_filename, 'w', encoding='utf8'):
-            pass  # Just open then close to create zero-length file
-        self.nodes.append(self.start_node(0, self.options.tmpdir,
-                            ["-blockversion=2", "-alertnotify=echo %s >> \"" + self.alert_filename + "\""]))
-        # Node1 mines block.version=211 blocks
-        self.nodes.append(self.start_node(1, self.options.tmpdir,
-                                ["-blockversion=211"]))
-        connect_nodes(self.nodes[1], 0)
-
-        self.sync_all()
-
-    def run_test(self):
-        # Mine 51 up-version blocks
-        self.nodes[1].generate(51)
-        self.sync_all()
-        # -alertnotify should trigger on the 51'st,
-        # but mine and sync another to give
-        # -alertnotify time to write
-        self.nodes[1].generate(1)
-        self.sync_all()
-
-        # Give bitcoind 10 seconds to write the alert notification
-        timeout = 10.0
-        while timeout > 0:
-            if os.path.exists(self.alert_filename) and os.path.getsize(self.alert_filename):
-                break
-            time.sleep(0.1)
-            timeout -= 0.1
-        else:
-            assert False, "-alertnotify did not warn of up-version blocks"
-
-        with open(self.alert_filename, 'r', encoding='utf8') as f:
-            alert_text = f.read()
-
-        # Mine more up-version blocks, should not get more alerts:
-        self.nodes[1].generate(1)
-        self.sync_all()
-        self.nodes[1].generate(1)
-        self.sync_all()
-
-        with open(self.alert_filename, 'r', encoding='utf8') as f:
-            alert_text2 = f.read()
-
-        if alert_text != alert_text2:
-            raise AssertionError("-alertnotify excessive warning of up-version blocks")
-
-if __name__ == '__main__':
-    ForkNotifyTest().main()
diff --git a/test/functional/fundrawtransaction.py b/test/functional/fundrawtransaction.py
index e52e77391..d446f56d0 100755
--- a/test/functional/fundrawtransaction.py
+++ b/test/functional/fundrawtransaction.py
@@ -4,7 +4,7 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test the fundrawtransaction RPC."""
 
-from test_framework.test_framework import BitcoinTestFramework, BITCOIND_PROC_WAIT_TIMEOUT
+from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import *
 
 
@@ -14,13 +14,10 @@ def get_unspent(listunspent, amount):
             return utx
     raise AssertionError('Could not find unspent with amount={}'.format(amount))
 
-
 class RawTransactionsTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = True
+    def set_test_params(self):
         self.num_nodes = 4
+        self.setup_clean_chain = True
 
     def setup_network(self, split=False):
         self.setup_nodes()
@@ -182,7 +179,7 @@ def run_test(self):
         dec_tx  = self.nodes[2].decoderawtransaction(rawtx)
         assert_equal(utx['txid'], dec_tx['vin'][0]['txid'])
 
-        assert_raises_jsonrpc(-3, "Unexpected key foo", self.nodes[2].fundrawtransaction, rawtx, {'foo':'bar'})
+        assert_raises_rpc_error(-3, "Unexpected key foo", self.nodes[2].fundrawtransaction, rawtx, {'foo':'bar'})
 
         ############################################################
         # test a fundrawtransaction with an invalid change address #
@@ -195,7 +192,7 @@ def run_test(self):
         dec_tx  = self.nodes[2].decoderawtransaction(rawtx)
         assert_equal(utx['txid'], dec_tx['vin'][0]['txid'])
 
-        assert_raises_jsonrpc(-5, "changeAddress must be a valid bitcoin address", self.nodes[2].fundrawtransaction, rawtx, {'changeAddress':'foobar'})
+        assert_raises_rpc_error(-5, "changeAddress must be a valid bitcoin address", self.nodes[2].fundrawtransaction, rawtx, {'changeAddress':'foobar'})
 
         ############################################################
         # test a fundrawtransaction with a provided change address #
@@ -209,7 +206,7 @@ def run_test(self):
         assert_equal(utx['txid'], dec_tx['vin'][0]['txid'])
 
         change = self.nodes[2].getnewaddress()
-        assert_raises_jsonrpc(-8, "changePosition out of bounds", self.nodes[2].fundrawtransaction, rawtx, {'changeAddress':change, 'changePosition':2})
+        assert_raises_rpc_error(-8, "changePosition out of bounds", self.nodes[2].fundrawtransaction, rawtx, {'changeAddress':change, 'changePosition':2})
         rawtxfund = self.nodes[2].fundrawtransaction(rawtx, {'changeAddress': change, 'changePosition': 0})
         dec_tx  = self.nodes[2].decoderawtransaction(rawtxfund['hex'])
         out = dec_tx['vout'][0]
@@ -312,13 +309,12 @@ def run_test(self):
         ##############################################
         # test a fundrawtransaction with invalid vin #
         ##############################################
-        listunspent = self.nodes[2].listunspent()
         inputs  = [ {'txid' : "1c7f966dab21119bac53213a2bc7532bff1fa844c124fd750a7d0b1332440bd1", 'vout' : 0} ] #invalid vin!
         outputs = { self.nodes[0].getnewaddress() : 1.0}
         rawtx   = self.nodes[2].createrawtransaction(inputs, outputs)
         dec_tx  = self.nodes[2].decoderawtransaction(rawtx)
 
-        assert_raises_jsonrpc(-4, "Insufficient funds", self.nodes[2].fundrawtransaction, rawtx)
+        assert_raises_rpc_error(-4, "Insufficient funds", self.nodes[2].fundrawtransaction, rawtx)
 
         ############################################################
         #compare fee of a standard pubkeyhash transaction
@@ -449,12 +445,11 @@ def run_test(self):
         ############################################################
         # locked wallet test
         self.stop_node(0)
+        self.nodes[1].node_encrypt_wallet("test")
         self.stop_node(2)
         self.stop_node(3)
-        self.nodes[1].encryptwallet("test")
-        self.bitcoind_processes[1].wait(timeout=BITCOIND_PROC_WAIT_TIMEOUT)
 
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir)
+        self.start_nodes()
         # This test is not meant to test fee estimation and we'd like
         # to be sure all txs are sent at a consistent desired feerate
         for node in self.nodes:
@@ -474,14 +469,14 @@ def run_test(self):
         rawtx = self.nodes[1].createrawtransaction(inputs, outputs)
         # fund a transaction that requires a new key for the change output
         # creating the key must be impossible because the wallet is locked
-        assert_raises_jsonrpc(-4, "Keypool ran out, please call keypoolrefill first", self.nodes[1].fundrawtransaction, rawtx)
+        assert_raises_rpc_error(-4, "Keypool ran out, please call keypoolrefill first", self.nodes[1].fundrawtransaction, rawtx)
 
         #refill the keypool
         self.nodes[1].walletpassphrase("test", 100)
         self.nodes[1].keypoolrefill(8) #need to refill the keypool to get an internal change address
         self.nodes[1].walletlock()
 
-        assert_raises_jsonrpc(-13, "walletpassphrase", self.nodes[1].sendtoaddress, self.nodes[0].getnewaddress(), 1.2)
+        assert_raises_rpc_error(-13, "walletpassphrase", self.nodes[1].sendtoaddress, self.nodes[0].getnewaddress(), 1.2)
 
         oldBalance = self.nodes[0].getbalance()
 
diff --git a/test/functional/getblocktemplate_longpoll.py b/test/functional/getblocktemplate_longpoll.py
index bbe1dda5f..89768bd2f 100755
--- a/test/functional/getblocktemplate_longpoll.py
+++ b/test/functional/getblocktemplate_longpoll.py
@@ -17,16 +17,14 @@ def __init__(self, node):
         self.longpollid = templat['longpollid']
         # create a new connection to the node, we can't use the same
         # connection from two threads
-        self.node = get_rpc_proxy(node.url, 1, timeout=600)
+        self.node = get_rpc_proxy(node.url, 1, timeout=600, coveragedir=node.coverage_dir)
 
     def run(self):
         self.node.getblocktemplate({'longpollid':self.longpollid})
 
 class GetBlockTemplateLPTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
-        self.num_nodes = 4
-        self.setup_clean_chain = False
+    def set_test_params(self):
+        self.num_nodes = 2
 
     def run_test(self):
         self.log.info("Warning: this test will take about 70 seconds in the best case. Be patient.")
diff --git a/test/functional/getchaintips.py b/test/functional/getchaintips.py
index 15f96c565..21b67bfc6 100755
--- a/test/functional/getchaintips.py
+++ b/test/functional/getchaintips.py
@@ -14,13 +14,10 @@
 from test_framework.util import assert_equal
 
 class GetChainTipsTest (BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 4
-        self.setup_clean_chain = False
 
     def run_test (self):
-
         tips = self.nodes[0].getchaintips ()
         assert_equal (len (tips), 1)
         assert_equal (tips[0]['branchlen'], 0)
diff --git a/test/functional/httpbasics.py b/test/functional/httpbasics.py
index 4b32e8d9c..c7682cb49 100755
--- a/test/functional/httpbasics.py
+++ b/test/functional/httpbasics.py
@@ -11,10 +11,8 @@
 import urllib.parse
 
 class HTTPBasicsTest (BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 3
-        self.setup_clean_chain = False
 
     def setup_network(self):
         self.setup_nodes()
diff --git a/test/functional/import-rescan.py b/test/functional/import-rescan.py
index 4fc507821..6807fa669 100755
--- a/test/functional/import-rescan.py
+++ b/test/functional/import-rescan.py
@@ -19,9 +19,8 @@
 happened previously.
 """
 
-from test_framework.authproxy import JSONRPCException
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import (connect_nodes, sync_blocks, assert_equal, set_node_times)
+from test_framework.util import (assert_raises_rpc_error, connect_nodes, sync_blocks, assert_equal, set_node_times)
 
 import collections
 import enum
@@ -35,21 +34,26 @@
 class Variant(collections.namedtuple("Variant", "call data rescan prune")):
     """Helper for importing one key and verifying scanned transactions."""
 
+    def try_rpc(self, func, *args, **kwargs):
+        if self.expect_disabled:
+            assert_raises_rpc_error(-4, "Rescan is disabled in pruned mode", func, *args, **kwargs)
+        else:
+            return func(*args, **kwargs)
+
     def do_import(self, timestamp):
         """Call one key import RPC."""
 
         if self.call == Call.single:
             if self.data == Data.address:
-                response, error = try_rpc(self.node.importaddress, self.address["address"], self.label,
-                                          self.rescan == Rescan.yes)
+                response = self.try_rpc(self.node.importaddress, self.address["address"], self.label,
+                                               self.rescan == Rescan.yes)
             elif self.data == Data.pub:
-                response, error = try_rpc(self.node.importpubkey, self.address["pubkey"], self.label,
-                                          self.rescan == Rescan.yes)
+                response = self.try_rpc(self.node.importpubkey, self.address["pubkey"], self.label,
+                                               self.rescan == Rescan.yes)
             elif self.data == Data.priv:
-                response, error = try_rpc(self.node.importprivkey, self.key, self.label, self.rescan == Rescan.yes)
+                response = self.try_rpc(self.node.importprivkey, self.key, self.label, self.rescan == Rescan.yes)
             assert_equal(response, None)
-            assert_equal(error, {'message': 'Rescan is disabled in pruned mode',
-                                 'code': -4} if self.expect_disabled else None)
+
         elif self.call == Call.multi:
             response = self.node.importmulti([{
                 "scriptPubKey": {
@@ -111,8 +115,7 @@ def check(self, txid=None, amount=None, confirmations=None):
 
 
 class ImportRescanTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2 + len(IMPORT_NODES)
 
     def setup_network(self):
@@ -121,7 +124,8 @@ def setup_network(self):
             if import_node.prune:
                 extra_args[i] += ["-prune=1"]
 
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, extra_args)
+        self.add_nodes(self.num_nodes, extra_args)
+        self.start_nodes()
         for i in range(1, self.num_nodes):
             connect_nodes(self.nodes[i], 0)
 
@@ -161,7 +165,6 @@ def run_test(self):
                 variant.check()
 
         # Create new transactions sending to each address.
-        fee = self.nodes[0].getnetworkinfo()["relayfee"]
         for i, variant in enumerate(IMPORT_VARIANTS):
             variant.sent_amount = 10 - (2 * i + 1) / 8.0
             variant.sent_txid = self.nodes[0].sendtoaddress(variant.address["address"], variant.sent_amount)
@@ -180,13 +183,5 @@ def run_test(self):
             else:
                 variant.check()
 
-
-def try_rpc(func, *args, **kwargs):
-    try:
-        return func(*args, **kwargs), None
-    except JSONRPCException as e:
-        return None, e.error
-
-
 if __name__ == "__main__":
     ImportRescanTest().main()
diff --git a/test/functional/importmulti.py b/test/functional/importmulti.py
index e83e85de1..a691595f1 100755
--- a/test/functional/importmulti.py
+++ b/test/functional/importmulti.py
@@ -7,8 +7,7 @@
 from test_framework.util import *
 
 class ImportMultiTest (BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2
         self.setup_clean_chain = True
 
@@ -21,16 +20,7 @@ def run_test (self):
         self.nodes[1].generate(1)
         timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
 
-        # keyword definition
-        PRIV_KEY = 'privkey'
-        PUB_KEY = 'pubkey'
-        ADDRESS_KEY = 'address'
-        SCRIPT_KEY = 'script'
-
-
         node0_address1 = self.nodes[0].validateaddress(self.nodes[0].getnewaddress())
-        node0_address2 = self.nodes[0].validateaddress(self.nodes[0].getnewaddress())
-        node0_address3 = self.nodes[0].validateaddress(self.nodes[0].getnewaddress())
 
         #Check only one address
         assert_equal(node0_address1['ismine'], True)
@@ -170,6 +160,18 @@ def run_test (self):
         assert_equal(address_assert['ismine'], True)
         assert_equal(address_assert['timestamp'], timestamp)
 
+        self.log.info("Should not import an address with private key if is already imported")
+        result = self.nodes[1].importmulti([{
+            "scriptPubKey": {
+                "address": address['address']
+            },
+            "timestamp": "now",
+            "keys": [ self.nodes[0].dumpprivkey(address['address']) ]
+        }])
+        assert_equal(result[0]['success'], False)
+        assert_equal(result[0]['error']['code'], -4)
+        assert_equal(result[0]['error']['message'], 'The wallet already contains the private key for this address or script')
+
         # Address + Private key + watchonly
         self.log.info("Should not import an address with private key and with watchonly")
         address = self.nodes[0].validateaddress(self.nodes[0].getnewaddress())
@@ -230,7 +232,6 @@ def run_test (self):
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
         timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
-        transaction = self.nodes[1].gettransaction(transactionid)
 
         self.log.info("Should import a p2sh")
         result = self.nodes[1].importmulti([{
@@ -258,7 +259,6 @@ def run_test (self):
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
         timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
-        transaction = self.nodes[1].gettransaction(transactionid)
 
         self.log.info("Should import a p2sh with respective redeem script")
         result = self.nodes[1].importmulti([{
@@ -286,7 +286,6 @@ def run_test (self):
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
         timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
-        transaction = self.nodes[1].gettransaction(transactionid)
 
         self.log.info("Should import a p2sh with respective redeem script and private keys")
         result = self.nodes[1].importmulti([{
@@ -314,7 +313,6 @@ def run_test (self):
         transactionid = self.nodes[1].sendtoaddress(multi_sig_script['address'], 10.00)
         self.nodes[1].generate(1)
         timestamp = self.nodes[1].getblock(self.nodes[1].getbestblockhash())['mediantime']
-        transaction = self.nodes[1].gettransaction(transactionid)
 
         self.log.info("Should import a p2sh with respective redeem script and private keys")
         result = self.nodes[1].importmulti([{
@@ -429,7 +427,7 @@ def run_test (self):
 
         # restart nodes to check for proper serialization/deserialization of watch only address
         self.stop_nodes()
-        self.nodes = self.start_nodes(2, self.options.tmpdir)
+        self.start_nodes()
         address_assert = self.nodes[1].validateaddress(watchonly_address)
         assert_equal(address_assert['iswatchonly'], True)
         assert_equal(address_assert['ismine'], False)
@@ -437,11 +435,11 @@ def run_test (self):
 
         # Bad or missing timestamps
         self.log.info("Should throw on invalid or missing timestamp values")
-        assert_raises_message(JSONRPCException, 'Missing required timestamp field for key',
+        assert_raises_rpc_error(-3, 'Missing required timestamp field for key',
             self.nodes[1].importmulti, [{
                 "scriptPubKey": address['scriptPubKey'],
             }])
-        assert_raises_message(JSONRPCException, 'Expected number or "now" timestamp value for key. got type string',
+        assert_raises_rpc_error(-3, 'Expected number or "now" timestamp value for key. got type string',
             self.nodes[1].importmulti, [{
                 "scriptPubKey": address['scriptPubKey'],
                 "timestamp": "",
diff --git a/test/functional/importprunedfunds.py b/test/functional/importprunedfunds.py
index 94753fe43..068052409 100755
--- a/test/functional/importprunedfunds.py
+++ b/test/functional/importprunedfunds.py
@@ -6,11 +6,8 @@
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import *
 
-
 class ImportPrunedFundsTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
 
@@ -24,7 +21,6 @@ def run_test(self):
         address1 = self.nodes[0].getnewaddress()
         # pubkey
         address2 = self.nodes[0].getnewaddress()
-        address2_pubkey = self.nodes[0].validateaddress(address2)['pubkey']                 # Using pubkey
         # privkey
         address3 = self.nodes[0].getnewaddress()
         address3_privkey = self.nodes[0].dumpprivkey(address3)                              # Using privkey
@@ -70,20 +66,20 @@ def run_test(self):
         self.sync_all()
 
         #Import with no affiliated address
-        assert_raises_jsonrpc(-5, "No addresses", self.nodes[1].importprunedfunds, rawtxn1, proof1)
+        assert_raises_rpc_error(-5, "No addresses", self.nodes[1].importprunedfunds, rawtxn1, proof1)
 
         balance1 = self.nodes[1].getbalance("", 0, True)
         assert_equal(balance1, Decimal(0))
 
         #Import with affiliated address with no rescan
         self.nodes[1].importaddress(address2, "add2", False)
-        result2 = self.nodes[1].importprunedfunds(rawtxn2, proof2)
+        self.nodes[1].importprunedfunds(rawtxn2, proof2)
         balance2 = self.nodes[1].getbalance("add2", 0, True)
         assert_equal(balance2, Decimal('0.05'))
 
         #Import with private key with no rescan
-        self.nodes[1].importprivkey(address3_privkey, "add3", False)
-        result3 = self.nodes[1].importprunedfunds(rawtxn3, proof3)
+        self.nodes[1].importprivkey(privkey=address3_privkey, label="add3", rescan=False)
+        self.nodes[1].importprunedfunds(rawtxn3, proof3)
         balance3 = self.nodes[1].getbalance("add3", 0, False)
         assert_equal(balance3, Decimal('0.025'))
         balance3 = self.nodes[1].getbalance("*", 0, True)
@@ -101,7 +97,7 @@ def run_test(self):
         assert_equal(address_info['ismine'], True)
 
         #Remove transactions
-        assert_raises_jsonrpc(-8, "Transaction does not exist in wallet.", self.nodes[1].removeprunedfunds, txnid1)
+        assert_raises_rpc_error(-8, "Transaction does not exist in wallet.", self.nodes[1].removeprunedfunds, txnid1)
 
         balance1 = self.nodes[1].getbalance("*", 0, True)
         assert_equal(balance1, Decimal('0.075'))
diff --git a/test/functional/invalidateblock.py b/test/functional/invalidateblock.py
index c499d57b9..dd3daf1e0 100755
--- a/test/functional/invalidateblock.py
+++ b/test/functional/invalidateblock.py
@@ -8,9 +8,7 @@
 from test_framework.util import *
 
 class InvalidateTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
 
diff --git a/test/functional/invalidblockrequest.py b/test/functional/invalidblockrequest.py
index eabc0db8d..9f44b4492 100755
--- a/test/functional/invalidblockrequest.py
+++ b/test/functional/invalidblockrequest.py
@@ -23,9 +23,9 @@ class InvalidBlockRequestTest(ComparisonTestFramework):
 
     ''' Can either run this test as 1 node with expected answers, or two and compare them. 
         Change the "outcome" variable from each TestInstance object to only do the comparison. '''
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
+        self.setup_clean_chain = True
 
     def run_test(self):
         test = TestManager(self, self.options.tmpdir)
diff --git a/test/functional/invalidtxrequest.py b/test/functional/invalidtxrequest.py
index a9ac231f0..a22bd8f8c 100755
--- a/test/functional/invalidtxrequest.py
+++ b/test/functional/invalidtxrequest.py
@@ -19,9 +19,9 @@ class InvalidTxRequestTest(ComparisonTestFramework):
 
     ''' Can either run this test as 1 node with expected answers, or two and compare them. 
         Change the "outcome" variable from each TestInstance object to only do the comparison. '''
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
+        self.setup_clean_chain = True
 
     def run_test(self):
         test = TestManager(self, self.options.tmpdir)
diff --git a/test/functional/keypool-topup.py b/test/functional/keypool-topup.py
new file mode 100755
index 000000000..160a0f7ae
--- /dev/null
+++ b/test/functional/keypool-topup.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test HD Wallet keypool restore function.
+
+Two nodes. Node1 is under test. Node0 is providing transactions and generating blocks.
+
+- Start node1, shutdown and backup wallet.
+- Generate 110 keys (enough to drain the keypool). Store key 90 (in the initial keypool) and key 110 (beyond the initial keypool). Send funds to key 90 and key 110.
+- Stop node1, clear the datadir, move wallet file back into the datadir and restart node1.
+- connect node1 to node0. Verify that they sync and node1 receives its funds."""
+import shutil
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal,
+    connect_nodes_bi,
+    sync_blocks,
+)
+
+class KeypoolRestoreTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.setup_clean_chain = True
+        self.num_nodes = 2
+        self.extra_args = [[], ['-keypool=100', '-keypoolmin=20']]
+
+    def run_test(self):
+        self.tmpdir = self.options.tmpdir
+        self.nodes[0].generate(101)
+
+        self.log.info("Make backup of wallet")
+
+        self.stop_node(1)
+
+        shutil.copyfile(self.tmpdir + "/node1/regtest/wallet.dat", self.tmpdir + "/wallet.bak")
+        self.start_node(1, self.extra_args[1])
+        connect_nodes_bi(self.nodes, 0, 1)
+
+        self.log.info("Generate keys for wallet")
+
+        for _ in range(90):
+            addr_oldpool = self.nodes[1].getnewaddress()
+        for _ in range(20):
+            addr_extpool = self.nodes[1].getnewaddress()
+
+        self.log.info("Send funds to wallet")
+
+        self.nodes[0].sendtoaddress(addr_oldpool, 10)
+        self.nodes[0].generate(1)
+        self.nodes[0].sendtoaddress(addr_extpool, 5)
+        self.nodes[0].generate(1)
+        sync_blocks(self.nodes)
+
+        self.log.info("Restart node with wallet backup")
+
+        self.stop_node(1)
+
+        shutil.copyfile(self.tmpdir + "/wallet.bak", self.tmpdir + "/node1/regtest/wallet.dat")
+
+        self.log.info("Verify keypool is restored and balance is correct")
+
+        self.start_node(1, self.extra_args[1])
+        connect_nodes_bi(self.nodes, 0, 1)
+        self.sync_all()
+
+        assert_equal(self.nodes[1].getbalance(), 15)
+        assert_equal(self.nodes[1].listtransactions()[0]['category'], "receive")
+
+        # Check that we have marked all keys up to the used keypool key as used
+        assert_equal(self.nodes[1].validateaddress(self.nodes[1].getnewaddress())['hdkeypath'], "m/0'/0'/110'")
+
+if __name__ == '__main__':
+    KeypoolRestoreTest().main()
diff --git a/test/functional/keypool.py b/test/functional/keypool.py
index e8be55991..f2701c36b 100755
--- a/test/functional/keypool.py
+++ b/test/functional/keypool.py
@@ -8,6 +8,8 @@
 from test_framework.util import *
 
 class KeyPoolTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 1
 
     def run_test(self):
         nodes = self.nodes
@@ -17,17 +19,16 @@ def run_test(self):
         assert(addr_before_encrypting_data['hdmasterkeyid'] == wallet_info_old['hdmasterkeyid'])
         
         # Encrypt wallet and wait to terminate
-        nodes[0].encryptwallet('test')
-        self.bitcoind_processes[0].wait()
+        nodes[0].node_encrypt_wallet('test')
         # Restart node 0
-        nodes[0] = self.start_node(0, self.options.tmpdir)
+        self.start_node(0)
         # Keep creating keys
         addr = nodes[0].getnewaddress()
         addr_data = nodes[0].validateaddress(addr)
         wallet_info = nodes[0].getwalletinfo()
         assert(addr_before_encrypting_data['hdmasterkeyid'] != wallet_info['hdmasterkeyid'])
         assert(addr_data['hdmasterkeyid'] == wallet_info['hdmasterkeyid'])
-        assert_raises_jsonrpc(-12, "Error: Keypool ran out, please call keypoolrefill first", nodes[0].getnewaddress)
+        assert_raises_rpc_error(-12, "Error: Keypool ran out, please call keypoolrefill first", nodes[0].getnewaddress)
 
         # put six (plus 2) new keys in the keypool (100% external-, +100% internal-keys, 1 in min)
         nodes[0].walletpassphrase('test', 12000)
@@ -46,7 +47,7 @@ def run_test(self):
         nodes[0].getrawchangeaddress()
         addr = set()
         # the next one should fail
-        assert_raises_jsonrpc(-12, "Keypool ran out", nodes[0].getrawchangeaddress)
+        assert_raises_rpc_error(-12, "Keypool ran out", nodes[0].getrawchangeaddress)
 
         # drain the external keys
         addr.add(nodes[0].getnewaddress())
@@ -57,7 +58,7 @@ def run_test(self):
         addr.add(nodes[0].getnewaddress())
         assert(len(addr) == 6)
         # the next one should fail
-        assert_raises_jsonrpc(-12, "Error: Keypool ran out, please call keypoolrefill first", nodes[0].getnewaddress)
+        assert_raises_rpc_error(-12, "Error: Keypool ran out, please call keypoolrefill first", nodes[0].getnewaddress)
 
         # refill keypool with three new addresses
         nodes[0].walletpassphrase('test', 1)
@@ -71,7 +72,7 @@ def run_test(self):
         nodes[0].generate(1)
         nodes[0].generate(1)
         nodes[0].generate(1)
-        assert_raises_jsonrpc(-12, "Keypool ran out", nodes[0].generate, 1)
+        assert_raises_rpc_error(-12, "Keypool ran out", nodes[0].generate, 1)
 
         nodes[0].walletpassphrase('test', 100)
         nodes[0].keypoolrefill(100)
@@ -79,10 +80,5 @@ def run_test(self):
         assert_equal(wi['keypoolsize_hd_internal'], 100)
         assert_equal(wi['keypoolsize'], 100)
 
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = False
-        self.num_nodes = 1
-
 if __name__ == '__main__':
     KeyPoolTest().main()
diff --git a/test/functional/listsinceblock.py b/test/functional/listsinceblock.py
index ce2d556ef..6f428388e 100755
--- a/test/functional/listsinceblock.py
+++ b/test/functional/listsinceblock.py
@@ -8,11 +8,9 @@
 from test_framework.util import assert_equal
 
 class ListSinceBlockTest (BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = True
+    def set_test_params(self):
         self.num_nodes = 4
+        self.setup_clean_chain = True
 
     def run_test(self):
         self.nodes[2].generate(101)
diff --git a/test/functional/listtransactions.py b/test/functional/listtransactions.py
index f75a8e29c..e4522cc3b 100755
--- a/test/functional/listtransactions.py
+++ b/test/functional/listtransactions.py
@@ -16,15 +16,9 @@ def txFromHex(hexstring):
     return tx
 
 class ListTransactionsTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
-        self.num_nodes = 4
-        self.setup_clean_chain = False
-
-    def setup_nodes(self):
-        #This test requires mocktime
+    def set_test_params(self):
+        self.num_nodes = 2
         self.enable_mocktime()
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir)
 
     def run_test(self):
         # Simple send, 0 to 1:
diff --git a/test/functional/maxuploadtarget.py b/test/functional/maxuploadtarget.py
index 66e5bd29e..1f402798e 100755
--- a/test/functional/maxuploadtarget.py
+++ b/test/functional/maxuploadtarget.py
@@ -31,8 +31,7 @@ def on_block(self, conn, message):
 
 class MaxUploadTest(BitcoinTestFramework):
  
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
         self.extra_args = [["-maxuploadtarget=800", "-blockmaxsize=999000"]]
@@ -147,7 +146,7 @@ def run_test(self):
         #stop and start node 0 with 1MB maxuploadtarget, whitelist 127.0.0.1
         self.log.info("Restarting nodes with -whitelist=127.0.0.1")
         self.stop_node(0)
-        self.nodes[0] = self.start_node(0, self.options.tmpdir, ["-whitelist=127.0.0.1", "-maxuploadtarget=1", "-blockmaxsize=999000"])
+        self.start_node(0, ["-whitelist=127.0.0.1", "-maxuploadtarget=1", "-blockmaxsize=999000"])
 
         #recreate/reconnect a test node
         test_nodes = [TestNode()]
diff --git a/test/functional/mempool_limit.py b/test/functional/mempool_limit.py
index 2777291dd..e24dc5a46 100755
--- a/test/functional/mempool_limit.py
+++ b/test/functional/mempool_limit.py
@@ -8,9 +8,7 @@
 from test_framework.util import *
 
 class MempoolLimitTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
         self.extra_args = [["-maxmempool=5", "-spendzeroconfchange=0"]]
diff --git a/test/functional/mempool_packages.py b/test/functional/mempool_packages.py
index e22549381..b845c7568 100755
--- a/test/functional/mempool_packages.py
+++ b/test/functional/mempool_packages.py
@@ -12,10 +12,8 @@
 MAX_DESCENDANTS = 25
 
 class MempoolPackagesTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2
-        self.setup_clean_chain = False
         self.extra_args = [["-maxorphantx=1000"], ["-maxorphantx=1000", "-limitancestorcount=5"]]
 
     # Build a transaction that spends parent_txid:vout
@@ -117,7 +115,7 @@ def run_test(self):
             assert_equal(mempool[x]['descendantfees'], descendant_fees * COIN + 1000)
 
         # Adding one more transaction on to the chain should fail.
-        assert_raises_jsonrpc(-26, "too-long-mempool-chain", self.chain_transaction, self.nodes[0], txid, vout, value, fee, 1)
+        assert_raises_rpc_error(-26, "too-long-mempool-chain", self.chain_transaction, self.nodes[0], txid, vout, value, fee, 1)
 
         # Check that prioritising a tx before it's added to the mempool works
         # First clear the mempool by mining a block.
@@ -169,7 +167,7 @@ def run_test(self):
 
         # Sending one more chained transaction will fail
         utxo = transaction_package.pop(0)
-        assert_raises_jsonrpc(-26, "too-long-mempool-chain", self.chain_transaction, self.nodes[0], utxo['txid'], utxo['vout'], utxo['amount'], fee, 10)
+        assert_raises_rpc_error(-26, "too-long-mempool-chain", self.chain_transaction, self.nodes[0], utxo['txid'], utxo['vout'], utxo['amount'], fee, 10)
 
         # TODO: check that node1's mempool is as expected
 
@@ -213,7 +211,7 @@ def run_test(self):
         value = send_value
 
         # Create tx1
-        (tx1_id, tx1_value) = self.chain_transaction(self.nodes[0], tx0_id, 0, value, fee, 1)
+        tx1_id, _ = self.chain_transaction(self.nodes[0], tx0_id, 0, value, fee, 1)
 
         # Create tx2-7
         vout = 1
diff --git a/test/functional/mempool_persist.py b/test/functional/mempool_persist.py
index e0889fd5e..92f66be2f 100755
--- a/test/functional/mempool_persist.py
+++ b/test/functional/mempool_persist.py
@@ -28,21 +28,22 @@
   - Restart node0 with -persistmempool. Verify that it has 5
     transactions in its mempool. This tests that -persistmempool=0
     does not overwrite a previously valid mempool stored on disk.
+  - Remove node0 mempool.dat and verify savemempool RPC recreates it
+    and verify that node1 can load it and has 5 transaction in its
+    mempool.
+  - Verify that savemempool throws when the RPC is called if
+    node1 can't write to disk.
 
 """
+import os
 import time
 
-from test_framework.mininode import wait_until
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import *
 
 class MempoolPersistTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        # We need 3 nodes for this test. Node1 does not have a persistent mempool.
+    def set_test_params(self):
         self.num_nodes = 3
-        self.setup_clean_chain = False
         self.extra_args = [[], ["-persistmempool=0"], []]
 
     def run_test(self):
@@ -64,27 +65,46 @@ def run_test(self):
 
         self.log.debug("Stop-start node0 and node1. Verify that node0 has the transactions in its mempool and node1 does not.")
         self.stop_nodes()
-        self.nodes = []
-        self.nodes.append(self.start_node(0, self.options.tmpdir))
-        self.nodes.append(self.start_node(1, self.options.tmpdir))
+        self.start_node(0)
+        self.start_node(1)
         # Give bitcoind a second to reload the mempool
         time.sleep(1)
-        assert wait_until(lambda: len(self.nodes[0].getrawmempool()) == 5)
+        wait_until(lambda: len(self.nodes[0].getrawmempool()) == 5)
         assert_equal(len(self.nodes[1].getrawmempool()), 0)
 
         self.log.debug("Stop-start node0 with -persistmempool=0. Verify that it doesn't load its mempool.dat file.")
         self.stop_nodes()
-        self.nodes = []
-        self.nodes.append(self.start_node(0, self.options.tmpdir, ["-persistmempool=0"]))
+        self.start_node(0, extra_args=["-persistmempool=0"])
         # Give bitcoind a second to reload the mempool
         time.sleep(1)
         assert_equal(len(self.nodes[0].getrawmempool()), 0)
 
         self.log.debug("Stop-start node0. Verify that it has the transactions in its mempool.")
         self.stop_nodes()
-        self.nodes = []
-        self.nodes.append(self.start_node(0, self.options.tmpdir))
-        assert wait_until(lambda: len(self.nodes[0].getrawmempool()) == 5)
+        self.start_node(0)
+        wait_until(lambda: len(self.nodes[0].getrawmempool()) == 5)
+
+        mempooldat0 = os.path.join(self.options.tmpdir, 'node0', 'regtest', 'mempool.dat')
+        mempooldat1 = os.path.join(self.options.tmpdir, 'node1', 'regtest', 'mempool.dat')
+        self.log.debug("Remove the mempool.dat file. Verify that savemempool to disk via RPC re-creates it")
+        os.remove(mempooldat0)
+        self.nodes[0].savemempool()
+        assert os.path.isfile(mempooldat0)
+
+        self.log.debug("Stop nodes, make node1 use mempool.dat from node0. Verify it has 5 transactions")
+        os.rename(mempooldat0, mempooldat1)
+        self.stop_nodes()
+        self.start_node(1, extra_args=[])
+        wait_until(lambda: len(self.nodes[1].getrawmempool()) == 5)
+
+        self.log.debug("Prevent bitcoind from writing mempool.dat to disk. Verify that `savemempool` fails")
+        # to test the exception we are setting bad permissions on a tmp file called mempool.dat.new
+        # which is an implementation detail that could change and break this test
+        mempooldotnew1 = mempooldat1 + '.new'
+        with os.fdopen(os.open(mempooldotnew1, os.O_CREAT, 0o000), 'w'):
+            pass
+        assert_raises_rpc_error(-1, "Unable to dump mempool to disk", self.nodes[1].savemempool)
+        os.remove(mempooldotnew1)
 
 if __name__ == '__main__':
     MempoolPersistTest().main()
diff --git a/test/functional/mempool_reorg.py b/test/functional/mempool_reorg.py
index 937bf4bab..2803371f5 100755
--- a/test/functional/mempool_reorg.py
+++ b/test/functional/mempool_reorg.py
@@ -13,10 +13,8 @@
 
 # Create one-input, one-output, no-fee transaction:
 class MempoolCoinbaseTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2
-        self.setup_clean_chain = False
         self.extra_args = [["-checkmempool"]] * 2
 
     alert_filename = None  # Set by setup_network
@@ -52,14 +50,14 @@ def run_test(self):
         timelock_tx = timelock_tx[:-8] + hex(self.nodes[0].getblockcount() + 2)[2:] + "000000"
         timelock_tx = self.nodes[0].signrawtransaction(timelock_tx)["hex"]
         # This will raise an exception because the timelock transaction is too immature to spend
-        assert_raises_jsonrpc(-26, "non-final", self.nodes[0].sendrawtransaction, timelock_tx)
+        assert_raises_rpc_error(-26, "non-final", self.nodes[0].sendrawtransaction, timelock_tx)
 
         # Broadcast and mine spend_102 and 103:
         spend_102_id = self.nodes[0].sendrawtransaction(spend_102_raw)
         spend_103_id = self.nodes[0].sendrawtransaction(spend_103_raw)
         self.nodes[0].generate(1)
         # Time-locked transaction is still too immature to spend
-        assert_raises_jsonrpc(-26,'non-final', self.nodes[0].sendrawtransaction, timelock_tx)
+        assert_raises_rpc_error(-26,'non-final', self.nodes[0].sendrawtransaction, timelock_tx)
 
         # Create 102_1 and 103_1:
         spend_102_1_raw = create_tx(self.nodes[0], spend_102_id, node1_address, 49.98)
diff --git a/test/functional/mempool_resurrect_test.py b/test/functional/mempool_resurrect_test.py
index a2f6228df..1263c9306 100755
--- a/test/functional/mempool_resurrect_test.py
+++ b/test/functional/mempool_resurrect_test.py
@@ -9,12 +9,8 @@
 
 # Create one-input, one-output, no-fee transaction:
 class MempoolCoinbaseTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
-        self.setup_clean_chain = False
-        # Just need one node for this test
         self.extra_args = [["-checkmempool"]]
 
     def run_test(self):
diff --git a/test/functional/mempool_spendcoinbase.py b/test/functional/mempool_spendcoinbase.py
index 277ea45ad..6e8a635a7 100755
--- a/test/functional/mempool_spendcoinbase.py
+++ b/test/functional/mempool_spendcoinbase.py
@@ -17,11 +17,8 @@
 
 # Create one-input, one-output, no-fee transaction:
 class MempoolSpendCoinbaseTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
-        self.setup_clean_chain = False
         self.extra_args = [["-checkmempool"]]
 
     def run_test(self):
@@ -39,7 +36,7 @@ def run_test(self):
         spend_101_id = self.nodes[0].sendrawtransaction(spends_raw[0])
 
         # coinbase at height 102 should be too immature to spend
-        assert_raises_jsonrpc(-26,"bad-txns-premature-spend-of-coinbase", self.nodes[0].sendrawtransaction, spends_raw[1])
+        assert_raises_rpc_error(-26,"bad-txns-premature-spend-of-coinbase", self.nodes[0].sendrawtransaction, spends_raw[1])
 
         # mempool should have just spend_101:
         assert_equal(self.nodes[0].getrawmempool(), [ spend_101_id ])
diff --git a/test/functional/merkle_blocks.py b/test/functional/merkle_blocks.py
index bcc65c840..b3989a4c5 100755
--- a/test/functional/merkle_blocks.py
+++ b/test/functional/merkle_blocks.py
@@ -8,11 +8,9 @@
 from test_framework.util import *
 
 class MerkleBlockTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = True
+    def set_test_params(self):
         self.num_nodes = 4
+        self.setup_clean_chain = True
         # Nodes 0/1 are "wallet" nodes, Nodes 2/3 are used for testing
         self.extra_args = [[], [], [], ["-txindex"]]
 
@@ -40,7 +38,7 @@ def run_test(self):
         tx2 = self.nodes[0].createrawtransaction([node0utxos.pop()], {self.nodes[1].getnewaddress(): 49.99})
         txid2 = self.nodes[0].sendrawtransaction(self.nodes[0].signrawtransaction(tx2)["hex"])
         # This will raise an exception because the transaction is not yet in a block
-        assert_raises_jsonrpc(-5, "Transaction not yet in block", self.nodes[0].gettxoutproof, [txid1])
+        assert_raises_rpc_error(-5, "Transaction not yet in block", self.nodes[0].gettxoutproof, [txid1])
 
         self.nodes[0].generate(1)
         blockhash = self.nodes[0].getblockhash(chain_height + 1)
@@ -65,11 +63,11 @@ def run_test(self):
         txid_unspent = txid1 if txin_spent["txid"] != txid1 else txid2
 
         # We can't find the block from a fully-spent tx
-        assert_raises_jsonrpc(-5, "Transaction not yet in block", self.nodes[2].gettxoutproof, [txid_spent])
+        assert_raises_rpc_error(-5, "Transaction not yet in block", self.nodes[2].gettxoutproof, [txid_spent])
         # We can get the proof if we specify the block
         assert_equal(self.nodes[2].verifytxoutproof(self.nodes[2].gettxoutproof([txid_spent], blockhash)), [txid_spent])
         # We can't get the proof if we specify a non-existent block
-        assert_raises_jsonrpc(-5, "Block not found", self.nodes[2].gettxoutproof, [txid_spent], "00000000000000000000000000000000")
+        assert_raises_rpc_error(-5, "Block not found", self.nodes[2].gettxoutproof, [txid_spent], "00000000000000000000000000000000")
         # We can get the proof if the transaction is unspent
         assert_equal(self.nodes[2].verifytxoutproof(self.nodes[2].gettxoutproof([txid_unspent])), [txid_unspent])
         # We can get the proof if we provide a list of transactions and one of them is unspent. The ordering of the list should not matter.
@@ -78,7 +76,7 @@ def run_test(self):
         # We can always get a proof if we have a -txindex
         assert_equal(self.nodes[2].verifytxoutproof(self.nodes[3].gettxoutproof([txid_spent])), [txid_spent])
         # We can't get a proof if we specify transactions from different blocks
-        assert_raises_jsonrpc(-5, "Not all transactions found in specified or retrieved block", self.nodes[2].gettxoutproof, [txid1, txid3])
+        assert_raises_rpc_error(-5, "Not all transactions found in specified or retrieved block", self.nodes[2].gettxoutproof, [txid1, txid3])
 
 
 if __name__ == '__main__':
diff --git a/test/functional/minchainwork.py b/test/functional/minchainwork.py
new file mode 100755
index 000000000..35cd7ad14
--- /dev/null
+++ b/test/functional/minchainwork.py
@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test logic for setting nMinimumChainWork on command line.
+
+Nodes don't consider themselves out of "initial block download" until
+their active chain has more work than nMinimumChainWork.
+
+Nodes don't download blocks from a peer unless the peer's best known block
+has more work than nMinimumChainWork.
+
+While in initial block download, nodes won't relay blocks to their peers, so
+test that this parameter functions as intended by verifying that block relay
+only succeeds past a given node once its nMinimumChainWork has been exceeded.
+"""
+
+import time
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import sync_blocks, connect_nodes, assert_equal
+
+# 2 hashes required per regtest block (with no difficulty adjustment)
+REGTEST_WORK_PER_BLOCK = 2
+
+class MinimumChainWorkTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.setup_clean_chain = True
+        self.num_nodes = 3
+
+        self.extra_args = [[], ["-minimumchainwork=0x65"], ["-minimumchainwork=0x65"]]
+        self.node_min_work = [0, 101, 101]
+
+    def setup_network(self):
+        # This test relies on the chain setup being:
+        # node0 <- node1 <- node2
+        # Before leaving IBD, nodes prefer to download blocks from outbound
+        # peers, so ensure that we're mining on an outbound peer and testing
+        # block relay to inbound peers.
+        self.setup_nodes()
+        for i in range(self.num_nodes-1):
+            connect_nodes(self.nodes[i+1], i)
+
+    def run_test(self):
+        # Start building a chain on node0.  node2 shouldn't be able to sync until node1's
+        # minchainwork is exceeded
+        starting_chain_work = REGTEST_WORK_PER_BLOCK # Genesis block's work
+        self.log.info("Testing relay across node %d (minChainWork = %d)", 1, self.node_min_work[1])
+
+        starting_blockcount = self.nodes[2].getblockcount()
+
+        num_blocks_to_generate = int((self.node_min_work[1] - starting_chain_work) / REGTEST_WORK_PER_BLOCK)
+        self.log.info("Generating %d blocks on node0", num_blocks_to_generate)
+        hashes = self.nodes[0].generate(num_blocks_to_generate)
+
+        self.log.info("Node0 current chain work: %s", self.nodes[0].getblockheader(hashes[-1])['chainwork'])
+
+        # Sleep a few seconds and verify that node2 didn't get any new blocks
+        # or headers.  We sleep, rather than sync_blocks(node0, node1) because
+        # it's reasonable either way for node1 to get the blocks, or not get
+        # them (since they're below node1's minchainwork).
+        time.sleep(3)
+
+        self.log.info("Verifying node 2 has no more blocks than before")
+        self.log.info("Blockcounts: %s", [n.getblockcount() for n in self.nodes])
+        # Node2 shouldn't have any new headers yet, because node1 should not
+        # have relayed anything.
+        assert_equal(len(self.nodes[2].getchaintips()), 1)
+        assert_equal(self.nodes[2].getchaintips()[0]['height'], 0)
+
+        assert self.nodes[1].getbestblockhash() != self.nodes[0].getbestblockhash()
+        assert_equal(self.nodes[2].getblockcount(), starting_blockcount)
+
+        self.log.info("Generating one more block")
+        self.nodes[0].generate(1)
+
+        self.log.info("Verifying nodes are all synced")
+
+        # Because nodes in regtest are all manual connections (eg using
+        # addnode), node1 should not have disconnected node0. If not for that,
+        # we'd expect node1 to have disconnected node0 for serving an
+        # insufficient work chain, in which case we'd need to reconnect them to
+        # continue the test.
+
+        self.sync_all()
+        self.log.info("Blockcounts: %s", [n.getblockcount() for n in self.nodes])
+
+if __name__ == '__main__':
+    MinimumChainWorkTest().main()
diff --git a/test/functional/mining.py b/test/functional/mining.py
index dbd4e29ec..9aee06864 100755
--- a/test/functional/mining.py
+++ b/test/functional/mining.py
@@ -4,16 +4,18 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test mining RPCs
 
+- getmininginfo
 - getblocktemplate proposal mode
 - submitblock"""
 
-from binascii import b2a_hex
 import copy
+from binascii import b2a_hex
+from decimal import Decimal
 
 from test_framework.blocktools import create_coinbase
-from test_framework.test_framework import BitcoinTestFramework
 from test_framework.mininode import CBlock
-from test_framework.util import *
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal, assert_raises_rpc_error
 
 def b2x(b):
     return b2a_hex(b).decode('ascii')
@@ -25,14 +27,23 @@ def assert_template(node, block, expect, rehash=True):
     assert_equal(rsp, expect)
 
 class MiningTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2
         self.setup_clean_chain = False
 
     def run_test(self):
         node = self.nodes[0]
+
+        self.log.info('getmininginfo')
+        mining_info = node.getmininginfo()
+        assert_equal(mining_info['blocks'], 200)
+        assert_equal(mining_info['chain'], 'regtest')
+        assert_equal(mining_info['currentblocktx'], 0)
+        assert_equal(mining_info['currentblockweight'], 0)
+        assert_equal(mining_info['difficulty'], Decimal('4.656542373906925E-10'))
+        assert_equal(mining_info['networkhashps'], Decimal('0.003333333333333334'))
+        assert_equal(mining_info['pooledtx'], 0)
+
         # Mine a block to leave initial block download
         node.generate(1)
         tmpl = node.getblocktemplate()
@@ -57,7 +68,7 @@ def run_test(self):
         assert_template(node, block, None)
 
         self.log.info("submitblock: Test block decode failure")
-        assert_raises_jsonrpc(-22, "Block decode failed", node.submitblock, b2x(block.serialize()[:-15]))
+        assert_raises_rpc_error(-22, "Block decode failed", node.submitblock, b2x(block.serialize()[:-15]))
 
         self.log.info("getblocktemplate: Test bad input hash for coinbase transaction")
         bad_block = copy.deepcopy(block)
@@ -66,10 +77,10 @@ def run_test(self):
         assert_template(node, bad_block, 'bad-cb-missing')
 
         self.log.info("submitblock: Test invalid coinbase transaction")
-        assert_raises_jsonrpc(-22, "Block does not start with a coinbase", node.submitblock, b2x(bad_block.serialize()))
+        assert_raises_rpc_error(-22, "Block does not start with a coinbase", node.submitblock, b2x(bad_block.serialize()))
 
         self.log.info("getblocktemplate: Test truncated final transaction")
-        assert_raises_jsonrpc(-22, "Block decode failed", node.getblocktemplate, {'data': b2x(block.serialize()[:-1]), 'mode': 'proposal'})
+        assert_raises_rpc_error(-22, "Block decode failed", node.getblocktemplate, {'data': b2x(block.serialize()[:-1]), 'mode': 'proposal'})
 
         self.log.info("getblocktemplate: Test duplicate transaction")
         bad_block = copy.deepcopy(block)
@@ -96,7 +107,7 @@ def run_test(self):
         bad_block_sn = bytearray(block.serialize())
         assert_equal(bad_block_sn[TX_COUNT_OFFSET], 1)
         bad_block_sn[TX_COUNT_OFFSET] += 1
-        assert_raises_jsonrpc(-22, "Block decode failed", node.getblocktemplate, {'data': b2x(bad_block_sn), 'mode': 'proposal'})
+        assert_raises_rpc_error(-22, "Block decode failed", node.getblocktemplate, {'data': b2x(bad_block_sn), 'mode': 'proposal'})
 
         self.log.info("getblocktemplate: Test bad bits")
         bad_block = copy.deepcopy(block)
diff --git a/test/functional/multi_rpc.py b/test/functional/multi_rpc.py
index a30e15ace..a2b346f27 100755
--- a/test/functional/multi_rpc.py
+++ b/test/functional/multi_rpc.py
@@ -12,10 +12,7 @@
 import urllib.parse
 
 class HTTPBasicsTest (BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = False
+    def set_test_params(self):
         self.num_nodes = 2
 
     def setup_chain(self):
diff --git a/test/functional/multiwallet.py b/test/functional/multiwallet.py
index 5679f4050..7a0fbce47 100755
--- a/test/functional/multiwallet.py
+++ b/test/functional/multiwallet.py
@@ -7,42 +7,52 @@
 Verify that a bitcoind node can load multiple wallet files
 """
 import os
+import shutil
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, assert_raises_jsonrpc
+from test_framework.util import assert_equal, assert_raises_rpc_error
 
 class MultiWalletTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
         self.extra_args = [['-wallet=w1', '-wallet=w2', '-wallet=w3']]
 
     def run_test(self):
+        assert_equal(set(self.nodes[0].listwallets()), {"w1", "w2", "w3"})
+
         self.stop_node(0)
 
         # should not initialize if there are duplicate wallets
-        self.assert_start_raises_init_error(0, self.options.tmpdir, ['-wallet=w1', '-wallet=w1'], 'Error loading wallet w1. Duplicate -wallet filename specified.')
+        self.assert_start_raises_init_error(0, ['-wallet=w1', '-wallet=w1'], 'Error loading wallet w1. Duplicate -wallet filename specified.')
 
         # should not initialize if wallet file is a directory
         os.mkdir(os.path.join(self.options.tmpdir, 'node0', 'regtest', 'w11'))
-        self.assert_start_raises_init_error(0, self.options.tmpdir, ['-wallet=w11'], 'Error loading wallet w11. -wallet filename must be a regular file.')
+        self.assert_start_raises_init_error(0, ['-wallet=w11'], 'Error loading wallet w11. -wallet filename must be a regular file.')
+
+        # should not initialize if one wallet is a copy of another
+        shutil.copyfile(os.path.join(self.options.tmpdir, 'node0', 'regtest', 'w2'),
+                        os.path.join(self.options.tmpdir, 'node0', 'regtest', 'w22'))
+        self.assert_start_raises_init_error(0, ['-wallet=w2', '-wallet=w22'], 'duplicates fileid')
 
         # should not initialize if wallet file is a symlink
         os.symlink(os.path.join(self.options.tmpdir, 'node0', 'regtest', 'w1'), os.path.join(self.options.tmpdir, 'node0', 'regtest', 'w12'))
-        self.assert_start_raises_init_error(0, self.options.tmpdir, ['-wallet=w12'], 'Error loading wallet w12. -wallet filename must be a regular file.')
+        self.assert_start_raises_init_error(0, ['-wallet=w12'], 'Error loading wallet w12. -wallet filename must be a regular file.')
 
-        self.nodes[0] = self.start_node(0, self.options.tmpdir, self.extra_args[0])
+        self.start_node(0, self.extra_args[0])
+
+        w1 = self.nodes[0].get_wallet_rpc("w1")
+        w2 = self.nodes[0].get_wallet_rpc("w2")
+        w3 = self.nodes[0].get_wallet_rpc("w3")
+        wallet_bad = self.nodes[0].get_wallet_rpc("bad")
 
-        w1 = self.nodes[0] / "wallet/w1"
         w1.generate(1)
 
         # accessing invalid wallet fails
-        assert_raises_jsonrpc(-18, "Requested wallet does not exist or is not loaded", (self.nodes[0] / "wallet/bad").getwalletinfo)
+        assert_raises_rpc_error(-18, "Requested wallet does not exist or is not loaded", wallet_bad.getwalletinfo)
 
         # accessing wallet RPC without using wallet endpoint fails
-        assert_raises_jsonrpc(-19, "Wallet file not specified", self.nodes[0].getwalletinfo)
+        assert_raises_rpc_error(-19, "Wallet file not specified", self.nodes[0].getwalletinfo)
 
         # check w1 wallet balance
         w1_info = w1.getwalletinfo()
@@ -50,14 +60,12 @@ def run_test(self):
         w1_name = w1_info['walletname']
         assert_equal(w1_name, "w1")
 
-        # check w1 wallet balance
-        w2 = self.nodes[0] / "wallet/w2"
+        # check w2 wallet balance
         w2_info = w2.getwalletinfo()
         assert_equal(w2_info['immature_balance'], 0)
         w2_name = w2_info['walletname']
         assert_equal(w2_name, "w2")
 
-        w3 = self.nodes[0] / "wallet/w3"
         w3_name = w3.getwalletinfo()['walletname']
         assert_equal(w3_name, "w3")
 
@@ -74,5 +82,9 @@ def run_test(self):
         assert_equal(w2.getbalance(), 1)
         assert_equal(w3.getbalance(), 2)
 
+        batch = w1.batch([w1.getblockchaininfo.get_request(), w1.getwalletinfo.get_request()])
+        assert_equal(batch[0]["result"]["chain"], "regtest")
+        assert_equal(batch[1]["result"]["walletname"], "w1")
+
 if __name__ == '__main__':
     MultiWalletTest().main()
diff --git a/test/functional/net.py b/test/functional/net.py
index 3ba3764cf..16e4f6adb 100755
--- a/test/functional/net.py
+++ b/test/functional/net.py
@@ -12,15 +12,13 @@
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
-    assert_raises_jsonrpc,
+    assert_raises_rpc_error,
     connect_nodes_bi,
     p2p_port,
 )
 
-
 class NetTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
 
@@ -85,8 +83,8 @@ def _test_getaddednodeinfo(self):
         added_nodes = self.nodes[0].getaddednodeinfo(ip_port)
         assert_equal(len(added_nodes), 1)
         assert_equal(added_nodes[0]['addednode'], ip_port)
-        # check that a non-existant node returns an error
-        assert_raises_jsonrpc(-24, "Node has not been added",
+        # check that a non-existent node returns an error
+        assert_raises_rpc_error(-24, "Node has not been added",
                               self.nodes[0].getaddednodeinfo, '1.1.1.1')
 
     def _test_getpeerinfo(self):
diff --git a/test/functional/notifications.py b/test/functional/notifications.py
new file mode 100755
index 000000000..c88972ab9
--- /dev/null
+++ b/test/functional/notifications.py
@@ -0,0 +1,86 @@
+#!/usr/bin/env python3
+# Copyright (c) 2014-2016 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test the -alertnotify, -blocknotify and -walletnotify options."""
+import os
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal, wait_until, connect_nodes_bi
+
+class NotificationsTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 2
+        self.setup_clean_chain = True
+
+    def setup_network(self):
+        self.alert_filename = os.path.join(self.options.tmpdir, "alert.txt")
+        self.block_filename = os.path.join(self.options.tmpdir, "blocks.txt")
+        self.tx_filename = os.path.join(self.options.tmpdir, "transactions.txt")
+
+        # -alertnotify and -blocknotify on node0, walletnotify on node1
+        self.extra_args = [["-blockversion=2",
+                            "-alertnotify=echo %%s >> %s" % self.alert_filename,
+                            "-blocknotify=echo %%s >> %s" % self.block_filename],
+                           ["-blockversion=211",
+                            "-rescan",
+                            "-walletnotify=echo %%s >> %s" % self.tx_filename]]
+        super().setup_network()
+
+    def run_test(self):
+        self.log.info("test -blocknotify")
+        block_count = 10
+        blocks = self.nodes[1].generate(block_count)
+
+        # wait at most 10 seconds for expected file size before reading the content
+        wait_until(lambda: os.path.isfile(self.block_filename) and os.stat(self.block_filename).st_size >= (block_count * 65), timeout=10)
+
+        # file content should equal the generated blocks hashes
+        with open(self.block_filename, 'r') as f:
+            assert_equal(sorted(blocks), sorted(f.read().splitlines()))
+
+        self.log.info("test -walletnotify")
+        # wait at most 10 seconds for expected file size before reading the content
+        wait_until(lambda: os.path.isfile(self.tx_filename) and os.stat(self.tx_filename).st_size >= (block_count * 65), timeout=10)
+
+        # file content should equal the generated transaction hashes
+        txids_rpc = list(map(lambda t: t['txid'], self.nodes[1].listtransactions("*", block_count)))
+        with open(self.tx_filename, 'r') as f:
+            assert_equal(sorted(txids_rpc), sorted(f.read().splitlines()))
+        os.remove(self.tx_filename)
+
+        self.log.info("test -walletnotify after rescan")
+        # restart node to rescan to force wallet notifications
+        self.restart_node(1)
+        connect_nodes_bi(self.nodes, 0, 1)
+
+        wait_until(lambda: os.path.isfile(self.tx_filename) and os.stat(self.tx_filename).st_size >= (block_count * 65), timeout=10)
+
+        # file content should equal the generated transaction hashes
+        txids_rpc = list(map(lambda t: t['txid'], self.nodes[1].listtransactions("*", block_count)))
+        with open(self.tx_filename, 'r') as f:
+            assert_equal(sorted(txids_rpc), sorted(f.read().splitlines()))
+
+        # Mine another 41 up-version blocks. -alertnotify should trigger on the 51st.
+        self.log.info("test -alertnotify")
+        self.nodes[1].generate(41)
+        self.sync_all()
+
+        # Give bitcoind 10 seconds to write the alert notification
+        wait_until(lambda: os.path.isfile(self.alert_filename) and os.path.getsize(self.alert_filename), timeout=10)
+
+        with open(self.alert_filename, 'r', encoding='utf8') as f:
+            alert_text = f.read()
+
+        # Mine more up-version blocks, should not get more alerts:
+        self.nodes[1].generate(2)
+        self.sync_all()
+
+        with open(self.alert_filename, 'r', encoding='utf8') as f:
+            alert_text2 = f.read()
+
+        self.log.info("-alertnotify should not continue notifying for more unknown version blocks")
+        assert_equal(alert_text, alert_text2)
+
+if __name__ == '__main__':
+    NotificationsTest().main()
diff --git a/test/functional/nulldummy.py b/test/functional/nulldummy.py
index 9717add27..91c455065 100755
--- a/test/functional/nulldummy.py
+++ b/test/functional/nulldummy.py
@@ -37,8 +37,7 @@ def trueDummy(tx):
 
 class NULLDUMMYTest(BitcoinTestFramework):
 
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
         self.setup_clean_chain = True
         self.extra_args = [['-whitelist=127.0.0.1', '-walletprematurewitness']]
@@ -72,7 +71,7 @@ def run_test(self):
         self.log.info("Test 2: Non-NULLDUMMY base multisig transaction should not be accepted to mempool before activation")
         test2tx = self.create_transaction(self.nodes[0], txid2, self.ms_address, 47)
         trueDummy(test2tx)
-        assert_raises_jsonrpc(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, bytes_to_hex_str(test2tx.serialize_with_witness()), True)
+        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, bytes_to_hex_str(test2tx.serialize_with_witness()), True)
 
         self.log.info("Test 3: Non-NULLDUMMY base transactions should be accepted in a block before activation [431]")
         self.block_submit(self.nodes[0], [test2tx], False, True)
@@ -81,14 +80,14 @@ def run_test(self):
         test4tx = self.create_transaction(self.nodes[0], test2tx.hash, self.address, 46)
         test6txs=[CTransaction(test4tx)]
         trueDummy(test4tx)
-        assert_raises_jsonrpc(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, bytes_to_hex_str(test4tx.serialize_with_witness()), True)
+        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, bytes_to_hex_str(test4tx.serialize_with_witness()), True)
         self.block_submit(self.nodes[0], [test4tx])
 
         self.log.info("Test 5: Non-NULLDUMMY P2WSH multisig transaction invalid after activation")
         test5tx = self.create_transaction(self.nodes[0], txid3, self.wit_address, 48)
         test6txs.append(CTransaction(test5tx))
         test5tx.wit.vtxinwit[0].scriptWitness.stack[0] = b'\x01'
-        assert_raises_jsonrpc(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, bytes_to_hex_str(test5tx.serialize_with_witness()), True)
+        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, bytes_to_hex_str(test5tx.serialize_with_witness()), True)
         self.block_submit(self.nodes[0], [test5tx], True)
 
         self.log.info("Test 6: NULLDUMMY compliant base/witness transactions should be accepted to mempool and in block after activation [432]")
diff --git a/test/functional/p2p-acceptblock.py b/test/functional/p2p-acceptblock.py
index 322cb767d..27ae0c27e 100755
--- a/test/functional/p2p-acceptblock.py
+++ b/test/functional/p2p-acceptblock.py
@@ -8,17 +8,22 @@
 versus non-whitelisted peers, this tests the behavior of both (effectively two
 separate tests running in parallel).
 
-Setup: two nodes, node0 and node1, not connected to each other.  Node0 does not
+Setup: three nodes, node0+node1+node2, not connected to each other.  Node0 does not
 whitelist localhost, but node1 does. They will each be on their own chain for
-this test.
+this test.  Node2 will have nMinimumChainWork set to 0x10, so it won't process
+low-work unrequested blocks.
 
-We have one NodeConn connection to each, test_node and white_node respectively.
+We have one NodeConn connection to each, test_node, white_node, and min_work_node,
+respectively.
 
 The test:
 1. Generate one block on each node, to leave IBD.
 
 2. Mine a new block on each tip, and deliver to each node from node's peer.
-   The tip should advance.
+   The tip should advance for node0 and node1, but node2 should skip processing
+   due to nMinimumChainWork.
+
+Node2 is unused in tests 3-7:
 
 3. Mine a block that forks the previous block, and deliver to each node from
    corresponding peer.
@@ -46,6 +51,10 @@
 
 7. Send Node0 the missing block again.
    Node0 should process and the tip should advance.
+
+8. Test Node2 is able to sync when connected to node0 (which should have sufficient
+work on its chain).
+
 """
 
 from test_framework.mininode import *
@@ -60,54 +69,62 @@ def add_options(self, parser):
                           default=os.getenv("BITCOIND", "bitcoind"),
                           help="bitcoind binary to test")
 
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
-        self.num_nodes = 2
-        self.extra_args = [[], ["-whitelist=127.0.0.1"]]
+        self.num_nodes = 3
+        self.extra_args = [[], ["-whitelist=127.0.0.1"], ["-minimumchainwork=0x10"]]
 
     def setup_network(self):
         # Node0 will be used to test behavior of processing unrequested blocks
         # from peers which are not whitelisted, while Node1 will be used for
         # the whitelisted case.
+        # Node2 will be used for non-whitelisted peers to test the interaction
+        # with nMinimumChainWork.
         self.setup_nodes()
 
     def run_test(self):
         # Setup the p2p connections and start up the network thread.
         test_node = NodeConnCB()   # connects to node0 (not whitelisted)
         white_node = NodeConnCB()  # connects to node1 (whitelisted)
+        min_work_node = NodeConnCB()  # connects to node2 (not whitelisted)
 
         connections = []
         connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_node))
         connections.append(NodeConn('127.0.0.1', p2p_port(1), self.nodes[1], white_node))
+        connections.append(NodeConn('127.0.0.1', p2p_port(2), self.nodes[2], min_work_node))
         test_node.add_connection(connections[0])
         white_node.add_connection(connections[1])
+        min_work_node.add_connection(connections[2])
 
         NetworkThread().start() # Start up network handling in another thread
 
         # Test logic begins here
         test_node.wait_for_verack()
         white_node.wait_for_verack()
+        min_work_node.wait_for_verack()
 
-        # 1. Have both nodes mine a block (leave IBD)
+        # 1. Have nodes mine a block (nodes1/2 leave IBD)
         [ n.generate(1) for n in self.nodes ]
         tips = [ int("0x" + n.getbestblockhash(), 0) for n in self.nodes ]
 
         # 2. Send one block that builds on each tip.
-        # This should be accepted.
+        # This should be accepted by nodes 1/2
         blocks_h2 = []  # the height 2 blocks on each node's chain
         block_time = int(time.time()) + 1
-        for i in range(2):
+        for i in range(3):
             blocks_h2.append(create_block(tips[i], create_coinbase(2), block_time))
             blocks_h2[i].solve()
             block_time += 1
         test_node.send_message(msg_block(blocks_h2[0]))
         white_node.send_message(msg_block(blocks_h2[1]))
+        min_work_node.send_message(msg_block(blocks_h2[2]))
 
-        [ x.sync_with_ping() for x in [test_node, white_node] ]
+        for x in [test_node, white_node, min_work_node]:
+            x.sync_with_ping()
         assert_equal(self.nodes[0].getblockcount(), 2)
         assert_equal(self.nodes[1].getblockcount(), 2)
-        self.log.info("First height 2 block accepted by both nodes")
+        assert_equal(self.nodes[2].getblockcount(), 1)
+        self.log.info("First height 2 block accepted by node0/node1; correctly rejected by node2")
 
         # 3. Send another block that builds on the original tip.
         blocks_h2f = []  # Blocks at height 2 that fork off the main chain
@@ -117,7 +134,8 @@ def run_test(self):
         test_node.send_message(msg_block(blocks_h2f[0]))
         white_node.send_message(msg_block(blocks_h2f[1]))
 
-        [ x.sync_with_ping() for x in [test_node, white_node] ]
+        for x in [test_node, white_node]:
+            x.sync_with_ping()
         for x in self.nodes[0].getchaintips():
             if x['hash'] == blocks_h2f[0].hash:
                 assert_equal(x['status'], "headers-only")
@@ -136,7 +154,8 @@ def run_test(self):
         test_node.send_message(msg_block(blocks_h3[0]))
         white_node.send_message(msg_block(blocks_h3[1]))
 
-        [ x.sync_with_ping() for x in [test_node, white_node] ]
+        for x in [test_node, white_node]:
+            x.sync_with_ping()
         # Since the earlier block was not processed by node0, the new block
         # can't be fully validated.
         for x in self.nodes[0].getchaintips():
@@ -172,7 +191,7 @@ def run_test(self):
         # Blocks 1-287 should be accepted, block 288 should be ignored because it's too far ahead
         for x in all_blocks[:-1]:
             self.nodes[0].getblock(x.hash)
-        assert_raises_jsonrpc(-1, "Block not found on disk", self.nodes[0].getblock, all_blocks[-1].hash)
+        assert_raises_rpc_error(-1, "Block not found on disk", self.nodes[0].getblock, all_blocks[-1].hash)
 
         headers_message.headers.pop() # Ensure the last block is unrequested
         white_node.send_message(headers_message) # Send headers leading to tip
@@ -218,6 +237,11 @@ def run_test(self):
         assert_equal(self.nodes[0].getblockcount(), 290)
         self.log.info("Successfully reorged to longer chain from non-whitelisted peer")
 
+        # 8. Connect node2 to node0 and ensure it is able to sync
+        connect_nodes(self.nodes[0], 2)
+        sync_blocks([self.nodes[0], self.nodes[2]])
+        self.log.info("Successfully synced nodes 2 and 0")
+
         [ c.disconnect_node() for c in connections ]
 
 if __name__ == '__main__':
diff --git a/test/functional/p2p-compactblocks.py b/test/functional/p2p-compactblocks.py
index ff76e49fb..94513d3f4 100755
--- a/test/functional/p2p-compactblocks.py
+++ b/test/functional/p2p-compactblocks.py
@@ -70,7 +70,7 @@ def send_header_for_blocks(self, new_blocks):
     def request_headers_and_sync(self, locator, hashstop=0):
         self.clear_block_announcement()
         self.get_headers(locator, hashstop)
-        assert wait_until(self.received_block_announcement, timeout=30)
+        wait_until(self.received_block_announcement, timeout=30, lock=mininode_lock)
         self.clear_block_announcement()
 
     # Block until a block announcement for a particular block hash is
@@ -78,7 +78,7 @@ def request_headers_and_sync(self, locator, hashstop=0):
     def wait_for_block_announcement(self, block_hash, timeout=30):
         def received_hash():
             return (block_hash in self.announced_blockhashes)
-        return wait_until(received_hash, timeout=timeout)
+        wait_until(received_hash, timeout=timeout, lock=mininode_lock)
 
     def send_await_disconnect(self, message, timeout=30):
         """Sends a message to the node and wait for disconnect.
@@ -86,15 +86,10 @@ def send_await_disconnect(self, message, timeout=30):
         This is used when we want to send a message into the node that we expect
         will get us disconnected, eg an invalid block."""
         self.send_message(message)
-        success = wait_until(lambda: not self.connected, timeout=timeout)
-        if not success:
-            logger.error("send_await_disconnect failed!")
-            raise AssertionError("send_await_disconnect failed!")
-        return success
+        wait_until(lambda: not self.connected, timeout=timeout, lock=mininode_lock)
 
 class CompactBlocksTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         # Node0 = pre-segwit, node1 = segwit-aware
         self.num_nodes = 2
@@ -150,9 +145,7 @@ def test_sendcmpct(self, node, test_node, preferred_version, old_node=None):
         # Make sure we get a SENDCMPCT message from our peer
         def received_sendcmpct():
             return (len(test_node.last_sendcmpct) > 0)
-        got_message = wait_until(received_sendcmpct, timeout=30)
-        assert(received_sendcmpct())
-        assert(got_message)
+        wait_until(received_sendcmpct, timeout=30, lock=mininode_lock)
         with mininode_lock:
             # Check that the first version received is the preferred one
             assert_equal(test_node.last_sendcmpct[0].version, preferred_version)
@@ -167,7 +160,6 @@ def check_announcement_of_new_block(node, peer, predicate):
             block_hash = int(node.generate(1)[0], 16)
             peer.wait_for_block_announcement(block_hash, timeout=30)
             assert(peer.block_announced)
-            assert(got_message)
 
             with mininode_lock:
                 assert predicate(peer), (
@@ -282,7 +274,7 @@ def test_compactblock_construction(self, node, test_node, version, use_witness_a
 
         # Wait until we've seen the block announcement for the resulting tip
         tip = int(node.getbestblockhash(), 16)
-        assert(test_node.wait_for_block_announcement(tip))
+        test_node.wait_for_block_announcement(tip)
 
         # Make sure we will receive a fast-announce compact block
         self.request_cb_announcements(test_node, node, version)
@@ -293,12 +285,12 @@ def test_compactblock_construction(self, node, test_node, version, use_witness_a
 
         # Store the raw block in our internal format.
         block = FromHex(CBlock(), node.getblock("%02x" % block_hash, False))
-        [tx.calc_sha256() for tx in block.vtx]
+        for tx in block.vtx:
+            tx.calc_sha256()
         block.rehash()
 
         # Wait until the block was announced (via compact blocks)
-        wait_until(test_node.received_block_announcement, timeout=30)
-        assert(test_node.received_block_announcement())
+        wait_until(test_node.received_block_announcement, timeout=30, lock=mininode_lock)
 
         # Now fetch and check the compact block
         header_and_shortids = None
@@ -314,8 +306,7 @@ def test_compactblock_construction(self, node, test_node, version, use_witness_a
             inv = CInv(4, block_hash)  # 4 == "CompactBlock"
             test_node.send_message(msg_getdata([inv]))
 
-        wait_until(test_node.received_block_announcement, timeout=30)
-        assert(test_node.received_block_announcement())
+        wait_until(test_node.received_block_announcement, timeout=30, lock=mininode_lock)
 
         # Now fetch and check the compact block
         header_and_shortids = None
@@ -386,13 +377,11 @@ def test_compactblock_requests(self, node, test_node, version, segwit):
 
             if announce == "inv":
                 test_node.send_message(msg_inv([CInv(2, block.sha256)]))
-                success = wait_until(lambda: "getheaders" in test_node.last_message, timeout=30)
-                assert(success)
+                wait_until(lambda: "getheaders" in test_node.last_message, timeout=30, lock=mininode_lock)
                 test_node.send_header_for_blocks([block])
             else:
                 test_node.send_header_for_blocks([block])
-            success = wait_until(lambda: "getdata" in test_node.last_message, timeout=30)
-            assert(success)
+            wait_until(lambda: "getdata" in test_node.last_message, timeout=30, lock=mininode_lock)
             assert_equal(len(test_node.last_message["getdata"].inv), 1)
             assert_equal(test_node.last_message["getdata"].inv[0].type, 4)
             assert_equal(test_node.last_message["getdata"].inv[0].hash, block.sha256)
@@ -571,8 +560,7 @@ def test_incorrect_blocktxn_response(self, node, test_node, version):
         assert_equal(int(node.getbestblockhash(), 16), block.hashPrevBlock)
 
         # We should receive a getdata request
-        success = wait_until(lambda: "getdata" in test_node.last_message, timeout=10)
-        assert(success)
+        wait_until(lambda: "getdata" in test_node.last_message, timeout=10, lock=mininode_lock)
         assert_equal(len(test_node.last_message["getdata"].inv), 1)
         assert(test_node.last_message["getdata"].inv[0].type == 2 or test_node.last_message["getdata"].inv[0].type == 2|MSG_WITNESS_FLAG)
         assert_equal(test_node.last_message["getdata"].inv[0].hash, block.sha256)
@@ -599,8 +587,7 @@ def test_getblocktxn_handler(self, node, test_node, version):
             num_to_request = random.randint(1, len(block.vtx))
             msg.block_txn_request.from_absolute(sorted(random.sample(range(len(block.vtx)), num_to_request)))
             test_node.send_message(msg)
-            success = wait_until(lambda: "blocktxn" in test_node.last_message, timeout=10)
-            assert(success)
+            wait_until(lambda: "blocktxn" in test_node.last_message, timeout=10, lock=mininode_lock)
 
             [tx.calc_sha256() for tx in block.vtx]
             with mininode_lock:
@@ -639,22 +626,20 @@ def test_compactblocks_not_at_tip(self, node, test_node):
         for i in range(MAX_CMPCTBLOCK_DEPTH + 1):
             test_node.clear_block_announcement()
             new_blocks.append(node.generate(1)[0])
-            wait_until(test_node.received_block_announcement, timeout=30)
+            wait_until(test_node.received_block_announcement, timeout=30, lock=mininode_lock)
 
         test_node.clear_block_announcement()
         test_node.send_message(msg_getdata([CInv(4, int(new_blocks[0], 16))]))
-        success = wait_until(lambda: "cmpctblock" in test_node.last_message, timeout=30)
-        assert(success)
+        wait_until(lambda: "cmpctblock" in test_node.last_message, timeout=30, lock=mininode_lock)
 
         test_node.clear_block_announcement()
         node.generate(1)
-        wait_until(test_node.received_block_announcement, timeout=30)
+        wait_until(test_node.received_block_announcement, timeout=30, lock=mininode_lock)
         test_node.clear_block_announcement()
         with mininode_lock:
             test_node.last_message.pop("block", None)
         test_node.send_message(msg_getdata([CInv(4, int(new_blocks[0], 16))]))
-        success = wait_until(lambda: "block" in test_node.last_message, timeout=30)
-        assert(success)
+        wait_until(lambda: "block" in test_node.last_message, timeout=30, lock=mininode_lock)
         with mininode_lock:
             test_node.last_message["block"].block.calc_sha256()
             assert_equal(test_node.last_message["block"].block.sha256, int(new_blocks[0], 16))
@@ -705,7 +690,7 @@ def test_end_to_end_block_relay(self, node, listeners):
         node.submitblock(ToHex(block))
 
         for l in listeners:
-            wait_until(lambda: l.received_block_announcement(), timeout=30)
+            wait_until(lambda: l.received_block_announcement(), timeout=30, lock=mininode_lock)
         with mininode_lock:
             for l in listeners:
                 assert "cmpctblock" in l.last_message
diff --git a/test/functional/p2p-feefilter.py b/test/functional/p2p-feefilter.py
index dbccb633a..8c92365ce 100755
--- a/test/functional/p2p-feefilter.py
+++ b/test/functional/p2p-feefilter.py
@@ -37,11 +37,8 @@ def clear_invs(self):
             self.txinvs = []
 
 class FeeFilterTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2
-        self.setup_clean_chain = False
 
     def run_test(self):
         node1 = self.nodes[1]
diff --git a/test/functional/p2p-fingerprint.py b/test/functional/p2p-fingerprint.py
new file mode 100755
index 000000000..fe60c6cd4
--- /dev/null
+++ b/test/functional/p2p-fingerprint.py
@@ -0,0 +1,158 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test various fingerprinting protections.
+
+If an stale block more than a month old or its header are requested by a peer,
+the node should pretend that it does not have it to avoid fingerprinting.
+"""
+
+import time
+
+from test_framework.blocktools import (create_block, create_coinbase)
+from test_framework.mininode import (
+    CInv,
+    NetworkThread,
+    NodeConn,
+    NodeConnCB,
+    msg_headers,
+    msg_block,
+    msg_getdata,
+    msg_getheaders,
+    wait_until,
+)
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal,
+    p2p_port,
+)
+
+class P2PFingerprintTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.setup_clean_chain = True
+        self.num_nodes = 1
+
+    # Build a chain of blocks on top of given one
+    def build_chain(self, nblocks, prev_hash, prev_height, prev_median_time):
+        blocks = []
+        for _ in range(nblocks):
+            coinbase = create_coinbase(prev_height + 1)
+            block_time = prev_median_time + 1
+            block = create_block(int(prev_hash, 16), coinbase, block_time)
+            block.solve()
+
+            blocks.append(block)
+            prev_hash = block.hash
+            prev_height += 1
+            prev_median_time = block_time
+        return blocks
+
+    # Send a getdata request for a given block hash
+    def send_block_request(self, block_hash, node):
+        msg = msg_getdata()
+        msg.inv.append(CInv(2, block_hash))  # 2 == "Block"
+        node.send_message(msg)
+
+    # Send a getheaders request for a given single block hash
+    def send_header_request(self, block_hash, node):
+        msg = msg_getheaders()
+        msg.hashstop = block_hash
+        node.send_message(msg)
+
+    # Check whether last block received from node has a given hash
+    def last_block_equals(self, expected_hash, node):
+        block_msg = node.last_message.get("block")
+        return block_msg and block_msg.block.rehash() == expected_hash
+
+    # Check whether last block header received from node has a given hash
+    def last_header_equals(self, expected_hash, node):
+        headers_msg = node.last_message.get("headers")
+        return (headers_msg and
+                headers_msg.headers and
+                headers_msg.headers[0].rehash() == expected_hash)
+
+    # Checks that stale blocks timestamped more than a month ago are not served
+    # by the node while recent stale blocks and old active chain blocks are.
+    # This does not currently test that stale blocks timestamped within the
+    # last month but that have over a month's worth of work are also withheld.
+    def run_test(self):
+        node0 = NodeConnCB()
+
+        connections = []
+        connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], node0))
+        node0.add_connection(connections[0])
+
+        NetworkThread().start()
+        node0.wait_for_verack()
+
+        # Set node time to 60 days ago
+        self.nodes[0].setmocktime(int(time.time()) - 60 * 24 * 60 * 60)
+
+        # Generating a chain of 10 blocks
+        block_hashes = self.nodes[0].generate(nblocks=10)
+
+        # Create longer chain starting 2 blocks before current tip
+        height = len(block_hashes) - 2
+        block_hash = block_hashes[height - 1]
+        block_time = self.nodes[0].getblockheader(block_hash)["mediantime"] + 1
+        new_blocks = self.build_chain(5, block_hash, height, block_time)
+
+        # Force reorg to a longer chain
+        node0.send_message(msg_headers(new_blocks))
+        node0.wait_for_getdata()
+        for block in new_blocks:
+            node0.send_and_ping(msg_block(block))
+
+        # Check that reorg succeeded
+        assert_equal(self.nodes[0].getblockcount(), 13)
+
+        stale_hash = int(block_hashes[-1], 16)
+
+        # Check that getdata request for stale block succeeds
+        self.send_block_request(stale_hash, node0)
+        test_function = lambda: self.last_block_equals(stale_hash, node0)
+        wait_until(test_function, timeout=3)
+
+        # Check that getheader request for stale block header succeeds
+        self.send_header_request(stale_hash, node0)
+        test_function = lambda: self.last_header_equals(stale_hash, node0)
+        wait_until(test_function, timeout=3)
+
+        # Longest chain is extended so stale is much older than chain tip
+        self.nodes[0].setmocktime(0)
+        tip = self.nodes[0].generate(nblocks=1)[0]
+        assert_equal(self.nodes[0].getblockcount(), 14)
+
+        # Send getdata & getheaders to refresh last received getheader message
+        block_hash = int(tip, 16)
+        self.send_block_request(block_hash, node0)
+        self.send_header_request(block_hash, node0)
+        node0.sync_with_ping()
+
+        # Request for very old stale block should now fail
+        self.send_block_request(stale_hash, node0)
+        time.sleep(3)
+        assert not self.last_block_equals(stale_hash, node0)
+
+        # Request for very old stale block header should now fail
+        self.send_header_request(stale_hash, node0)
+        time.sleep(3)
+        assert not self.last_header_equals(stale_hash, node0)
+
+        # Verify we can fetch very old blocks and headers on the active chain
+        block_hash = int(block_hashes[2], 16)
+        self.send_block_request(block_hash, node0)
+        self.send_header_request(block_hash, node0)
+        node0.sync_with_ping()
+
+        self.send_block_request(block_hash, node0)
+        test_function = lambda: self.last_block_equals(block_hash, node0)
+        wait_until(test_function, timeout=3)
+
+        self.send_header_request(block_hash, node0)
+        test_function = lambda: self.last_header_equals(block_hash, node0)
+        wait_until(test_function, timeout=3)
+
+if __name__ == '__main__':
+    P2PFingerprintTest().main()
diff --git a/test/functional/p2p-fullblocktest.py b/test/functional/p2p-fullblocktest.py
index e7fe7372c..f19b845a3 100755
--- a/test/functional/p2p-fullblocktest.py
+++ b/test/functional/p2p-fullblocktest.py
@@ -20,7 +20,7 @@
 from test_framework.script import *
 import struct
 
-class PreviousSpendableOutput(object):
+class PreviousSpendableOutput():
     def __init__(self, tx = CTransaction(), n = -1):
         self.tx = tx
         self.n = n  # the output we're spending
@@ -49,12 +49,11 @@ def normal_serialize(self):
         return r
 
 class FullBlockTest(ComparisonTestFramework):
-
     # Can either run this test as 1 node with expected answers, or two and compare them.
     # Change the "outcome" variable from each TestInstance object to only do the comparison.
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
+        self.setup_clean_chain = True
         self.block_heights = {}
         self.coinbase_key = CECKey()
         self.coinbase_key.set_secretbytes(b"horsebattery")
@@ -397,7 +396,7 @@ def update_block(block_number, new_transactions):
         yield rejected(RejectResult(16, b'bad-cb-length'))
 
         # Extend the b26 chain to make sure bitcoind isn't accepting b26
-        b27 = block(27, spend=out[7])
+        block(27, spend=out[7])
         yield rejected(False)
 
         # Now try a too-large-coinbase script
@@ -409,7 +408,7 @@ def update_block(block_number, new_transactions):
         yield rejected(RejectResult(16, b'bad-cb-length'))
 
         # Extend the b28 chain to make sure bitcoind isn't accepting b28
-        b29 = block(29, spend=out[7])
+        block(29, spend=out[7])
         yield rejected(False)
 
         # b30 has a max-sized coinbase scriptSig.
@@ -581,7 +580,7 @@ def update_block(block_number, new_transactions):
 
         # same as b40, but one less sigop
         tip(39)
-        b41 = block(41, spend=None)
+        block(41, spend=None)
         update_block(41, b40.vtx[1:-1])
         b41_sigops_to_fill = b40_sigops_to_fill - 1
         tx = CTransaction()
@@ -927,7 +926,7 @@ def update_block(block_number, new_transactions):
         # -> b42 (12) -> b43 (13) -> b53 (14) -> b55 (15) -> b57 (16) -> b60 (17) -> b64 (18) -> b65 (19)
         #
         tip(64)
-        b65 = block(65)
+        block(65)
         tx1 = create_and_sign_tx(out[19].tx, out[19].n, out[19].tx.vout[0].nValue)
         tx2 = create_and_sign_tx(tx1, 0, 0)
         update_block(65, [tx1, tx2])
@@ -939,7 +938,7 @@ def update_block(block_number, new_transactions):
         # -> b43 (13) -> b53 (14) -> b55 (15) -> b57 (16) -> b60 (17) -> b64 (18) -> b65 (19)
         #                                                                                    \-> b66 (20)
         tip(65)
-        b66 = block(66)
+        block(66)
         tx1 = create_and_sign_tx(out[20].tx, out[20].n, out[20].tx.vout[0].nValue)
         tx2 = create_and_sign_tx(tx1, 0, 1)
         update_block(66, [tx2, tx1])
@@ -952,7 +951,7 @@ def update_block(block_number, new_transactions):
         #
         #
         tip(65)
-        b67 = block(67)
+        block(67)
         tx1 = create_and_sign_tx(out[20].tx, out[20].n, out[20].tx.vout[0].nValue)
         tx2 = create_and_sign_tx(tx1, 0, 1)
         tx3 = create_and_sign_tx(tx1, 0, 2)
@@ -972,7 +971,7 @@ def update_block(block_number, new_transactions):
         #       this succeeds
         #
         tip(65)
-        b68 = block(68, additional_coinbase_value=10)
+        block(68, additional_coinbase_value=10)
         tx = create_and_sign_tx(out[20].tx, out[20].n, out[20].tx.vout[0].nValue-9)
         update_block(68, [tx])
         yield rejected(RejectResult(16, b'bad-cb-amount'))
@@ -1175,7 +1174,7 @@ def update_block(block_number, new_transactions):
         #
         #  -> b81 (26) -> b82 (27) -> b83 (28)
         #
-        b83 = block(83)
+        block(83)
         op_codes = [OP_IF, OP_INVALIDOPCODE, OP_ELSE, OP_TRUE, OP_ENDIF]
         script = CScript(op_codes)
         tx1 = create_and_sign_tx(out[28].tx, out[28].n, out[28].tx.vout[0].nValue, script)
@@ -1195,7 +1194,7 @@ def update_block(block_number, new_transactions):
         #                                    \-> b85 (29) -> b86 (30)            \-> b89a (32)
         #
         #
-        b84 = block(84)
+        block(84)
         tx1 = create_tx(out[29].tx, out[29].n, 0, CScript([OP_RETURN]))
         tx1.vout.append(CTxOut(0, CScript([OP_TRUE])))
         tx1.vout.append(CTxOut(0, CScript([OP_TRUE])))
diff --git a/test/functional/p2p-leaktests.py b/test/functional/p2p-leaktests.py
index 5611c876a..1dc8f72cd 100755
--- a/test/functional/p2p-leaktests.py
+++ b/test/functional/p2p-leaktests.py
@@ -92,8 +92,7 @@ def on_version(self, conn, message):
         conn.send_message(msg_getaddr())
 
 class P2PLeakTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 1
         self.extra_args = [['-banscore='+str(banscore)]]
 
@@ -119,11 +118,11 @@ def run_test(self):
 
         NetworkThread().start()  # Start up network handling in another thread
 
-        assert wait_until(lambda: no_version_bannode.ever_connected, timeout=10)
-        assert wait_until(lambda: no_version_idlenode.ever_connected, timeout=10)
-        assert wait_until(lambda: no_verack_idlenode.version_received, timeout=10)
-        assert wait_until(lambda: unsupported_service_bit5_node.ever_connected, timeout=10)
-        assert wait_until(lambda: unsupported_service_bit7_node.ever_connected, timeout=10)
+        wait_until(lambda: no_version_bannode.ever_connected, timeout=10, lock=mininode_lock)
+        wait_until(lambda: no_version_idlenode.ever_connected, timeout=10, lock=mininode_lock)
+        wait_until(lambda: no_verack_idlenode.version_received, timeout=10, lock=mininode_lock)
+        wait_until(lambda: unsupported_service_bit5_node.ever_connected, timeout=10, lock=mininode_lock)
+        wait_until(lambda: unsupported_service_bit7_node.ever_connected, timeout=10, lock=mininode_lock)
 
         # Mine a block and make sure that it's not sent to the connected nodes
         self.nodes[0].generate(1)
@@ -140,6 +139,9 @@ def run_test(self):
 
         [conn.disconnect_node() for conn in connections]
 
+        # Wait until all connections are closed
+        wait_until(lambda: len(self.nodes[0].getpeerinfo()) == 0)
+
         # Make sure no unexpected messages came in
         assert(no_version_bannode.unexpected_msg == False)
         assert(no_version_idlenode.unexpected_msg == False)
@@ -158,8 +160,10 @@ def run_test(self):
         allowed_service_bit5_node.add_connection(connections[5])
         allowed_service_bit7_node.add_connection(connections[6])
 
-        assert wait_until(lambda: allowed_service_bit5_node.message_count["verack"], timeout=10)
-        assert wait_until(lambda: allowed_service_bit7_node.message_count["verack"], timeout=10)
+        NetworkThread().start()  # Network thread stopped when all previous NodeConnCBs disconnected. Restart it
+
+        wait_until(lambda: allowed_service_bit5_node.message_count["verack"], lock=mininode_lock)
+        wait_until(lambda: allowed_service_bit7_node.message_count["verack"], lock=mininode_lock)
 
 if __name__ == '__main__':
     P2PLeakTest().main()
diff --git a/test/functional/p2p-mempool.py b/test/functional/p2p-mempool.py
index 34ef249ee..40fcde260 100755
--- a/test/functional/p2p-mempool.py
+++ b/test/functional/p2p-mempool.py
@@ -13,9 +13,7 @@
 from test_framework.util import *
 
 class P2PMempoolTests(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
         self.extra_args = [["-peerbloomfilters=0"]]
diff --git a/test/functional/p2p-segwit.py b/test/functional/p2p-segwit.py
index 63dfbb8ae..f80336766 100755
--- a/test/functional/p2p-segwit.py
+++ b/test/functional/p2p-segwit.py
@@ -17,7 +17,6 @@
 # The versionbit bit used to signal activation of SegWit
 VB_WITNESS_BIT = 1
 VB_PERIOD = 144
-VB_ACTIVATION_THRESHOLD = 108
 VB_TOP_BITS = 0x20000000
 
 MAX_SIGOP_COST = 80000
@@ -90,7 +89,7 @@ def test_witness_block(self, block, accepted, with_witness=True):
         assert_equal(self.connection.rpc.getbestblockhash() == block.hash, accepted)
 
 # Used to keep track of anyone-can-spend outputs that we can use in the tests
-class UTXO(object):
+class UTXO():
     def __init__(self, sha256, n, nValue):
         self.sha256 = sha256
         self.n = n
@@ -109,9 +108,7 @@ def sign_P2PK_witness_input(script, txTo, inIdx, hashtype, value, key):
 
 
 class SegWitTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
         self.extra_args = [["-whitelist=127.0.0.1"], ["-whitelist=127.0.0.1", "-acceptnonstdtxn=0"], ["-whitelist=127.0.0.1", "-vbparams=segwit:0:0"]]
@@ -1496,7 +1493,7 @@ def test_upgrade_after_activation(self, node_id):
 
         # Restart with the new binary
         self.stop_node(node_id)
-        self.nodes[node_id] = self.start_node(node_id, self.options.tmpdir)
+        self.start_node(node_id, extra_args=[])
         connect_nodes(self.nodes[0], node_id)
 
         sync_blocks(self.nodes)
diff --git a/test/functional/p2p-timeouts.py b/test/functional/p2p-timeouts.py
index c3b29c215..51d4769ef 100755
--- a/test/functional/p2p-timeouts.py
+++ b/test/functional/p2p-timeouts.py
@@ -33,8 +33,7 @@ def on_version(self, conn, message):
         pass
 
 class TimeoutsTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
 
diff --git a/test/functional/p2p-versionbits-warning.py b/test/functional/p2p-versionbits-warning.py
index df7e8ce5c..f9bef2580 100755
--- a/test/functional/p2p-versionbits-warning.py
+++ b/test/functional/p2p-versionbits-warning.py
@@ -28,8 +28,7 @@ def on_inv(self, conn, message):
         pass
 
 class VersionBitsWarningTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
 
@@ -88,8 +87,7 @@ def run_test(self):
         self.nodes[0].generate(VB_PERIOD - VB_THRESHOLD + 1)
         # Check that we're not getting any versionbit-related errors in
         # get*info()
-        assert(not VB_PATTERN.match(self.nodes[0].getinfo()["errors"]))
-        assert(not VB_PATTERN.match(self.nodes[0].getmininginfo()["errors"]))
+        assert(not VB_PATTERN.match(self.nodes[0].getmininginfo()["warnings"]))
         assert(not VB_PATTERN.match(self.nodes[0].getnetworkinfo()["warnings"]))
 
         # 3. Now build one period of blocks with >= VB_THRESHOLD blocks signaling
@@ -100,8 +98,7 @@ def run_test(self):
         # have gotten a different alert due to more than 51/100 blocks
         # being of unexpected version.
         # Check that get*info() shows some kind of error.
-        assert(WARN_UNKNOWN_RULES_MINED in self.nodes[0].getinfo()["errors"])
-        assert(WARN_UNKNOWN_RULES_MINED in self.nodes[0].getmininginfo()["errors"])
+        assert(WARN_UNKNOWN_RULES_MINED in self.nodes[0].getmininginfo()["warnings"])
         assert(WARN_UNKNOWN_RULES_MINED in self.nodes[0].getnetworkinfo()["warnings"])
 
         # Mine a period worth of expected blocks so the generic block-version warning
@@ -112,18 +109,17 @@ def run_test(self):
         # Empty out the alert file
         with open(self.alert_filename, 'w', encoding='utf8') as _:
             pass
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, self.extra_args)
+        self.start_nodes()
 
         # Connecting one block should be enough to generate an error.
         self.nodes[0].generate(1)
-        assert(WARN_UNKNOWN_RULES_ACTIVE in self.nodes[0].getinfo()["errors"])
-        assert(WARN_UNKNOWN_RULES_ACTIVE in self.nodes[0].getmininginfo()["errors"])
+        assert(WARN_UNKNOWN_RULES_ACTIVE in self.nodes[0].getmininginfo()["warnings"])
         assert(WARN_UNKNOWN_RULES_ACTIVE in self.nodes[0].getnetworkinfo()["warnings"])
         self.stop_nodes()
         self.test_versionbits_in_alert_file()
 
         # Test framework expects the node to still be running...
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, self.extra_args)
+        self.start_nodes()
 
 if __name__ == '__main__':
     VersionBitsWarningTest().main()
diff --git a/test/functional/preciousblock.py b/test/functional/preciousblock.py
index 04b41e76b..1466f901c 100755
--- a/test/functional/preciousblock.py
+++ b/test/functional/preciousblock.py
@@ -35,8 +35,7 @@ def node_sync_via_rpc(nodes):
             unidirectional_node_sync_via_rpc(node_src, node_dest)
 
 class PreciousTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
 
@@ -47,16 +46,16 @@ def run_test(self):
         self.log.info("Ensure submitblock can in principle reorg to a competing chain")
         self.nodes[0].generate(1)
         assert_equal(self.nodes[0].getblockcount(), 1)
-        (hashY, hashZ) = self.nodes[1].generate(2)
+        hashZ = self.nodes[1].generate(2)[-1]
         assert_equal(self.nodes[1].getblockcount(), 2)
         node_sync_via_rpc(self.nodes[0:3])
         assert_equal(self.nodes[0].getbestblockhash(), hashZ)
 
         self.log.info("Mine blocks A-B-C on Node 0")
-        (hashA, hashB, hashC) = self.nodes[0].generate(3)
+        hashC = self.nodes[0].generate(3)[-1]
         assert_equal(self.nodes[0].getblockcount(), 5)
         self.log.info("Mine competing blocks E-F-G on Node 1")
-        (hashE, hashF, hashG) = self.nodes[1].generate(3)
+        hashG = self.nodes[1].generate(3)[-1]
         assert_equal(self.nodes[1].getblockcount(), 5)
         assert(hashC != hashG)
         self.log.info("Connect nodes and check no reorg occurs")
diff --git a/test/functional/prioritise_transaction.py b/test/functional/prioritise_transaction.py
index 4fc03d254..bb56db9b4 100755
--- a/test/functional/prioritise_transaction.py
+++ b/test/functional/prioritise_transaction.py
@@ -9,9 +9,7 @@
 from test_framework.mininode import COIN, MAX_BLOCK_BASE_SIZE
 
 class PrioritiseTransactionTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
         self.extra_args = [["-printpriority=1"], ["-printpriority=1"]]
@@ -103,7 +101,7 @@ def run_test(self):
         tx_id = self.nodes[0].decoderawtransaction(tx_hex)["txid"]
 
         # This will raise an exception due to min relay fee not being met
-        assert_raises_jsonrpc(-26, "66: min relay fee not met", self.nodes[0].sendrawtransaction, tx_hex)
+        assert_raises_rpc_error(-26, "66: min relay fee not met", self.nodes[0].sendrawtransaction, tx_hex)
         assert(tx_id not in self.nodes[0].getrawmempool())
 
         # This is a less than 1000-byte transaction, so just set the fee
diff --git a/test/functional/proxy_test.py b/test/functional/proxy_test.py
index ae6f843dd..81b99d1bf 100755
--- a/test/functional/proxy_test.py
+++ b/test/functional/proxy_test.py
@@ -41,12 +41,9 @@
 
 RANGE_BEGIN = PORT_MIN + 2 * PORT_RANGE  # Start after p2p and rpc ports
 
-
 class ProxyTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 4
-        self.setup_clean_chain = False
 
     def setup_nodes(self):
         self.have_ipv6 = test_ipv6_local()
@@ -89,7 +86,8 @@ def setup_nodes(self):
             ]
         if self.have_ipv6:
             args[3] = ['-listen', '-proxy=[%s]:%i' % (self.conf3.addr),'-proxyrandomize=0', '-noonion']
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, extra_args=args)
+        self.add_nodes(self.num_nodes, extra_args=args)
+        self.start_nodes()
 
     def node_test(self, node, proxies, auth, test_onion=True):
         rv = []
diff --git a/test/functional/pruning.py b/test/functional/pruning.py
index 0af91e065..0101f6118 100755
--- a/test/functional/pruning.py
+++ b/test/functional/pruning.py
@@ -26,9 +26,7 @@ def calc_usage(blockdir):
     return sum(os.path.getsize(blockdir+f) for f in os.listdir(blockdir) if os.path.isfile(blockdir+f)) / (1024. * 1024.)
 
 class PruneTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 6
 
@@ -56,6 +54,10 @@ def setup_network(self):
         connect_nodes(self.nodes[0], 4)
         sync_blocks(self.nodes[0:5])
 
+    def setup_nodes(self):
+        self.add_nodes(self.num_nodes, self.extra_args, timewait=900)
+        self.start_nodes()
+
     def create_big_chain(self):
         # Start by creating some coinbases we can spend later
         self.nodes[1].generate(200)
@@ -98,7 +100,7 @@ def create_chain_with_staleblocks(self):
             # Node 2 stays connected, so it hears about the stale blocks and then reorg's when node0 reconnects
             # Stopping node 0 also clears its mempool, so it doesn't have node1's transactions to accidentally mine
             self.stop_node(0)
-            self.nodes[0]=self.start_node(0, self.options.tmpdir, self.full_node_default_args, timewait=900)
+            self.start_node(0, extra_args=self.full_node_default_args)
             # Mine 24 blocks in node 1
             for i in range(24):
                 if j == 0:
@@ -126,7 +128,7 @@ def reorg_test(self):
         # Reboot node 1 to clear its mempool (hopefully make the invalidate faster)
         # Lower the block max size so we don't keep mining all our big mempool transactions (from disconnected blocks)
         self.stop_node(1)
-        self.nodes[1] = self.start_node(1, self.options.tmpdir, ["-maxreceivebuffer=20000","-blockmaxsize=5000", "-checkblocks=5", "-disablesafemode"], timewait=900)
+        self.start_node(1, extra_args=["-maxreceivebuffer=20000","-blockmaxsize=5000", "-checkblocks=5", "-disablesafemode"])
 
         height = self.nodes[1].getblockcount()
         self.log.info("Current block height: %d" % height)
@@ -136,7 +138,7 @@ def reorg_test(self):
         self.log.info("Invalidating block %s at height %d" % (badhash,invalidheight))
         self.nodes[1].invalidateblock(badhash)
 
-        # We've now switched to our previously mined-24 block fork on node 1, but thats not what we want
+        # We've now switched to our previously mined-24 block fork on node 1, but that's not what we want
         # So invalidate that fork as well, until we're on the same chain as node 0/2 (but at an ancestor 288 blocks ago)
         mainchainhash = self.nodes[0].getblockhash(invalidheight - 1)
         curhash = self.nodes[1].getblockhash(invalidheight - 1)
@@ -149,7 +151,7 @@ def reorg_test(self):
 
         # Reboot node1 to clear those giant tx's from mempool
         self.stop_node(1)
-        self.nodes[1] = self.start_node(1, self.options.tmpdir, ["-maxreceivebuffer=20000","-blockmaxsize=5000", "-checkblocks=5", "-disablesafemode"], timewait=900)
+        self.start_node(1, extra_args=["-maxreceivebuffer=20000","-blockmaxsize=5000", "-checkblocks=5", "-disablesafemode"])
 
         self.log.info("Generating new longer chain of 300 more blocks")
         self.nodes[1].generate(300)
@@ -183,7 +185,7 @@ def reorg_test(self):
 
     def reorg_back(self):
         # Verify that a block on the old main chain fork has been pruned away
-        assert_raises_jsonrpc(-1, "Block not available (pruned data)", self.nodes[2].getblock, self.forkhash)
+        assert_raises_rpc_error(-1, "Block not available (pruned data)", self.nodes[2].getblock, self.forkhash)
         self.log.info("Will need to redownload block %d" % self.forkheight)
 
         # Verify that we have enough history to reorg back to the fork point
@@ -199,7 +201,7 @@ def reorg_back(self):
         goalbesthash = self.mainchainhash2
 
         # As of 0.10 the current block download logic is not able to reorg to the original chain created in
-        # create_chain_with_stale_blocks because it doesn't know of any peer thats on that chain from which to
+        # create_chain_with_stale_blocks because it doesn't know of any peer that's on that chain from which to
         # redownload its missing blocks.
         # Invalidate the reorg_test chain in node 0 as well, it can successfully switch to the original chain
         # because it has all the block data.
@@ -227,13 +229,15 @@ def reorg_back(self):
 
     def manual_test(self, node_number, use_timestamp):
         # at this point, node has 995 blocks and has not yet run in prune mode
-        node = self.nodes[node_number] = self.start_node(node_number, self.options.tmpdir, timewait=900)
+        self.start_node(node_number)
+        node = self.nodes[node_number]
         assert_equal(node.getblockcount(), 995)
-        assert_raises_jsonrpc(-1, "not in prune mode", node.pruneblockchain, 500)
-        self.stop_node(node_number)
+        assert_raises_rpc_error(-1, "not in prune mode", node.pruneblockchain, 500)
 
         # now re-start in manual pruning mode
-        node = self.nodes[node_number] = self.start_node(node_number, self.options.tmpdir, ["-prune=1"], timewait=900)
+        self.stop_node(node_number)
+        self.start_node(node_number, extra_args=["-prune=1"])
+        node = self.nodes[node_number]
         assert_equal(node.getblockcount(), 995)
 
         def height(index):
@@ -261,14 +265,14 @@ def has_block(index):
             return os.path.isfile(self.options.tmpdir + "/node{}/regtest/blocks/blk{:05}.dat".format(node_number, index))
 
         # should not prune because chain tip of node 3 (995) < PruneAfterHeight (1000)
-        assert_raises_jsonrpc(-1, "Blockchain is too short for pruning", node.pruneblockchain, height(500))
+        assert_raises_rpc_error(-1, "Blockchain is too short for pruning", node.pruneblockchain, height(500))
 
         # mine 6 blocks so we are at height 1001 (i.e., above PruneAfterHeight)
         node.generate(6)
         assert_equal(node.getblockchaininfo()["blocks"], 1001)
 
         # negative heights should raise an exception
-        assert_raises_jsonrpc(-8, "Negative", node.pruneblockchain, -10)
+        assert_raises_rpc_error(-8, "Negative", node.pruneblockchain, -10)
 
         # height=100 too low to prune first block file so this is a no-op
         prune(100)
@@ -307,7 +311,7 @@ def has_block(index):
 
         # stop node, start back up with auto-prune at 550MB, make sure still runs
         self.stop_node(node_number)
-        self.nodes[node_number] = self.start_node(node_number, self.options.tmpdir, ["-prune=550"], timewait=900)
+        self.start_node(node_number, extra_args=["-prune=550"])
 
         self.log.info("Success")
 
@@ -315,7 +319,7 @@ def wallet_test(self):
         # check that the pruning node's wallet is still in good shape
         self.log.info("Stop and start pruning node to trigger wallet rescan")
         self.stop_node(2)
-        self.nodes[2] = self.start_node(2, self.options.tmpdir, ["-prune=550"])
+        self.start_node(2, extra_args=["-prune=550"])
         self.log.info("Success")
 
         # check that wallet loads successfully when restarting a pruned node after IBD.
@@ -325,7 +329,7 @@ def wallet_test(self):
         nds = [self.nodes[0], self.nodes[5]]
         sync_blocks(nds, wait=5, timeout=300)
         self.stop_node(5) #stop and start to trigger rescan
-        self.nodes[5] = self.start_node(5, self.options.tmpdir, ["-prune=550"])
+        self.start_node(5, extra_args=["-prune=550"])
         self.log.info("Success")
 
     def run_test(self):
diff --git a/test/functional/rawtransactions.py b/test/functional/rawtransactions.py
index 6272fc69b..2777cb969 100755
--- a/test/functional/rawtransactions.py
+++ b/test/functional/rawtransactions.py
@@ -2,7 +2,7 @@
 # Copyright (c) 2014-2016 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
-"""Test the rawtranscation RPCs.
+"""Test the rawtransaction RPCs.
 
 Test the following RPCs:
    - createrawtransaction
@@ -17,9 +17,7 @@
 
 # Create one-input, one-output, no-fee transaction:
 class RawTransactionsTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
 
@@ -50,7 +48,7 @@ def run_test(self):
         rawtx   = self.nodes[2].signrawtransaction(rawtx)
 
         # This will raise an exception since there are missing inputs
-        assert_raises_jsonrpc(-25, "Missing inputs", self.nodes[2].sendrawtransaction, rawtx['hex'])
+        assert_raises_rpc_error(-25, "Missing inputs", self.nodes[2].sendrawtransaction, rawtx['hex'])
 
         #########################
         # RAW TX MULTISIG TESTS #
@@ -63,7 +61,6 @@ def run_test(self):
         addr2Obj = self.nodes[2].validateaddress(addr2)
 
         mSigObj = self.nodes[2].addmultisigaddress(2, [addr1Obj['pubkey'], addr2Obj['pubkey']])
-        mSigObjValid = self.nodes[2].validateaddress(mSigObj)
 
         #use balance deltas instead of absolute values
         bal = self.nodes[2].getbalance()
@@ -87,7 +84,6 @@ def run_test(self):
         addr3Obj = self.nodes[2].validateaddress(addr3)
 
         mSigObj = self.nodes[2].addmultisigaddress(2, [addr1Obj['pubkey'], addr2Obj['pubkey'], addr3Obj['pubkey']])
-        mSigObjValid = self.nodes[2].validateaddress(mSigObj)
 
         txId = self.nodes[0].sendtoaddress(mSigObj, 2.2)
         decTx = self.nodes[0].gettransaction(txId)
@@ -192,13 +188,13 @@ def run_test(self):
         assert_equal(self.nodes[0].getrawtransaction(txHash, True)["hex"], rawTxSigned['hex'])
 
         # 6. invalid parameters - supply txid and string "Flase"
-        assert_raises_jsonrpc(-3,"Invalid type", self.nodes[0].getrawtransaction, txHash, "Flase")
+        assert_raises_rpc_error(-3,"Invalid type", self.nodes[0].getrawtransaction, txHash, "Flase")
 
         # 7. invalid parameters - supply txid and empty array
-        assert_raises_jsonrpc(-3,"Invalid type", self.nodes[0].getrawtransaction, txHash, [])
+        assert_raises_rpc_error(-3,"Invalid type", self.nodes[0].getrawtransaction, txHash, [])
 
         # 8. invalid parameters - supply txid and empty dict
-        assert_raises_jsonrpc(-3,"Invalid type", self.nodes[0].getrawtransaction, txHash, {})
+        assert_raises_rpc_error(-3,"Invalid type", self.nodes[0].getrawtransaction, txHash, {})
 
         inputs  = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : 1000}]
         outputs = { self.nodes[0].getnewaddress() : 1 }
@@ -209,12 +205,12 @@ def run_test(self):
         # 9. invalid parameters - sequence number out of range
         inputs  = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : -1}]
         outputs = { self.nodes[0].getnewaddress() : 1 }
-        assert_raises_jsonrpc(-8, 'Invalid parameter, sequence number is out of range', self.nodes[0].createrawtransaction, inputs, outputs)
+        assert_raises_rpc_error(-8, 'Invalid parameter, sequence number is out of range', self.nodes[0].createrawtransaction, inputs, outputs)
 
         # 10. invalid parameters - sequence number out of range
         inputs  = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : 4294967296}]
         outputs = { self.nodes[0].getnewaddress() : 1 }
-        assert_raises_jsonrpc(-8, 'Invalid parameter, sequence number is out of range', self.nodes[0].createrawtransaction, inputs, outputs)
+        assert_raises_rpc_error(-8, 'Invalid parameter, sequence number is out of range', self.nodes[0].createrawtransaction, inputs, outputs)
 
         inputs  = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : 4294967294}]
         outputs = { self.nodes[0].getnewaddress() : 1 }
diff --git a/test/functional/receivedby.py b/test/functional/receivedby.py
index 19d99c9c9..db6fc86b8 100755
--- a/test/functional/receivedby.py
+++ b/test/functional/receivedby.py
@@ -23,16 +23,9 @@ def get_sub_array_from_array(object_array, to_match):
     return []
 
 class ReceivedByTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        self.num_nodes = 4
-        self.setup_clean_chain = False
-
-    def setup_nodes(self):
-        #This test requires mocktime
+    def set_test_params(self):
+        self.num_nodes = 2
         self.enable_mocktime()
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir)
 
     def run_test(self):
         '''
diff --git a/test/functional/reindex.py b/test/functional/reindex.py
index b446baa04..1f684a1af 100755
--- a/test/functional/reindex.py
+++ b/test/functional/reindex.py
@@ -15,8 +15,7 @@
 
 class ReindexTest(BitcoinTestFramework):
 
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
 
@@ -25,7 +24,7 @@ def reindex(self, justchainstate=False):
         blockcount = self.nodes[0].getblockcount()
         self.stop_nodes()
         extra_args = [["-reindex-chainstate" if justchainstate else "-reindex", "-checkblockindex=1"]]
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, extra_args)
+        self.start_nodes(extra_args)
         while self.nodes[0].getblockcount() < blockcount:
             time.sleep(0.1)
         assert_equal(self.nodes[0].getblockcount(), blockcount)
diff --git a/test/functional/replace-by-fee.py b/test/functional/replace-by-fee.py
index bc6765498..815e96484 100755
--- a/test/functional/replace-by-fee.py
+++ b/test/functional/replace-by-fee.py
@@ -61,20 +61,25 @@ def make_utxo(node, amount, confirmed=True, scriptPubKey=CScript([1])):
 
 class ReplaceByFeeTest(BitcoinTestFramework):
 
-    def __init__(self):
-        super().__init__()
-        self.num_nodes = 1
-        self.setup_clean_chain = False
+    def set_test_params(self):
+        self.num_nodes = 2
         self.extra_args= [["-maxorphantx=1000",
                            "-whitelist=127.0.0.1",
                            "-limitancestorcount=50",
                            "-limitancestorsize=101",
                            "-limitdescendantcount=200",
-                           "-limitdescendantsize=101"]]
+                           "-limitdescendantsize=101"],
+                           ["-mempoolreplacement=0"]]
 
     def run_test(self):
+        # Leave IBD
+        self.nodes[0].generate(1)
+
         make_utxo(self.nodes[0], 1*COIN)
 
+        # Ensure nodes are synced
+        self.sync_all()
+
         self.log.info("Running test simple doublespend...")
         self.test_simple_doublespend()
 
@@ -111,12 +116,19 @@ def test_simple_doublespend(self):
         """Simple doublespend"""
         tx0_outpoint = make_utxo(self.nodes[0], int(1.1*COIN))
 
+        # make_utxo may have generated a bunch of blocks, so we need to sync
+        # before we can spend the coins generated, or else the resulting
+        # transactions might not be accepted by our peers.
+        self.sync_all()
+
         tx1a = CTransaction()
         tx1a.vin = [CTxIn(tx0_outpoint, nSequence=0)]
         tx1a.vout = [CTxOut(1*COIN, CScript([b'a']))]
         tx1a_hex = txToHex(tx1a)
         tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, True)
 
+        self.sync_all()
+
         # Should fail because we haven't changed the fee
         tx1b = CTransaction()
         tx1b.vin = [CTxIn(tx0_outpoint, nSequence=0)]
@@ -124,13 +136,18 @@ def test_simple_doublespend(self):
         tx1b_hex = txToHex(tx1b)
 
         # This will raise an exception due to insufficient fee
-        assert_raises_jsonrpc(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, True)
+        # This will raise an exception due to transaction replacement being disabled
+        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[1].sendrawtransaction, tx1b_hex, True)
 
         # Extra 0.1 BTC fee
         tx1b = CTransaction()
         tx1b.vin = [CTxIn(tx0_outpoint, nSequence=0)]
         tx1b.vout = [CTxOut(int(0.9*COIN), CScript([b'b']))]
         tx1b_hex = txToHex(tx1b)
+        # Replacement still disabled even with "enough fee"
+        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[1].sendrawtransaction, tx1b_hex, True)
+        # Works when enabled
         tx1b_txid = self.nodes[0].sendrawtransaction(tx1b_hex, True)
 
         mempool = self.nodes[0].getrawmempool()
@@ -140,6 +157,11 @@ def test_simple_doublespend(self):
 
         assert_equal(tx1b_hex, self.nodes[0].getrawtransaction(tx1b_txid))
 
+        # Second node is running mempoolreplacement=0, will not replace originally-seen txn
+        mempool = self.nodes[1].getrawmempool()
+        assert tx1a_txid in mempool
+        assert tx1b_txid not in mempool
+
     def test_doublespend_chain(self):
         """Doublespend of a long chain"""
 
@@ -167,7 +189,7 @@ def test_doublespend_chain(self):
         dbl_tx_hex = txToHex(dbl_tx)
 
         # This will raise an exception due to insufficient fee
-        assert_raises_jsonrpc(-26, "insufficient fee", self.nodes[0].sendrawtransaction, dbl_tx_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, dbl_tx_hex, True)
 
         # Accepted with sufficient fee
         dbl_tx = CTransaction()
@@ -228,7 +250,7 @@ def branch(prevout, initial_value, max_txs, tree_width=5, fee=0.0001*COIN, _tota
         dbl_tx.vout = [CTxOut(initial_nValue - fee*n, CScript([1]))]
         dbl_tx_hex = txToHex(dbl_tx)
         # This will raise an exception due to insufficient fee
-        assert_raises_jsonrpc(-26, "insufficient fee", self.nodes[0].sendrawtransaction, dbl_tx_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, dbl_tx_hex, True)
 
         # 1 BTC fee is enough
         dbl_tx = CTransaction()
@@ -256,7 +278,7 @@ def branch(prevout, initial_value, max_txs, tree_width=5, fee=0.0001*COIN, _tota
             dbl_tx.vout = [CTxOut(initial_nValue - 2*fee*n, CScript([1]))]
             dbl_tx_hex = txToHex(dbl_tx)
             # This will raise an exception
-            assert_raises_jsonrpc(-26, "too many potential replacements", self.nodes[0].sendrawtransaction, dbl_tx_hex, True)
+            assert_raises_rpc_error(-26, "too many potential replacements", self.nodes[0].sendrawtransaction, dbl_tx_hex, True)
 
             for tx in tree_txs:
                 tx.rehash()
@@ -270,7 +292,7 @@ def test_replacement_feeperkb(self):
         tx1a.vin = [CTxIn(tx0_outpoint, nSequence=0)]
         tx1a.vout = [CTxOut(1*COIN, CScript([b'a']))]
         tx1a_hex = txToHex(tx1a)
-        tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, True)
+        self.nodes[0].sendrawtransaction(tx1a_hex, True)
 
         # Higher fee, but the fee per KB is much lower, so the replacement is
         # rejected.
@@ -280,7 +302,7 @@ def test_replacement_feeperkb(self):
         tx1b_hex = txToHex(tx1b)
 
         # This will raise an exception due to insufficient fee
-        assert_raises_jsonrpc(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, True)
 
     def test_spends_of_conflicting_outputs(self):
         """Replacements that spend conflicting tx outputs are rejected"""
@@ -303,7 +325,7 @@ def test_spends_of_conflicting_outputs(self):
         tx2_hex = txToHex(tx2)
 
         # This will raise an exception
-        assert_raises_jsonrpc(-26, "bad-txns-spends-conflicting-tx", self.nodes[0].sendrawtransaction, tx2_hex, True)
+        assert_raises_rpc_error(-26, "bad-txns-spends-conflicting-tx", self.nodes[0].sendrawtransaction, tx2_hex, True)
 
         # Spend tx1a's output to test the indirect case.
         tx1b = CTransaction()
@@ -320,7 +342,7 @@ def test_spends_of_conflicting_outputs(self):
         tx2_hex = txToHex(tx2)
 
         # This will raise an exception
-        assert_raises_jsonrpc(-26, "bad-txns-spends-conflicting-tx", self.nodes[0].sendrawtransaction, tx2_hex, True)
+        assert_raises_rpc_error(-26, "bad-txns-spends-conflicting-tx", self.nodes[0].sendrawtransaction, tx2_hex, True)
 
     def test_new_unconfirmed_inputs(self):
         """Replacements that add new unconfirmed inputs are rejected"""
@@ -331,7 +353,7 @@ def test_new_unconfirmed_inputs(self):
         tx1.vin = [CTxIn(confirmed_utxo)]
         tx1.vout = [CTxOut(1*COIN, CScript([b'a']))]
         tx1_hex = txToHex(tx1)
-        tx1_txid = self.nodes[0].sendrawtransaction(tx1_hex, True)
+        self.nodes[0].sendrawtransaction(tx1_hex, True)
 
         tx2 = CTransaction()
         tx2.vin = [CTxIn(confirmed_utxo), CTxIn(unconfirmed_utxo)]
@@ -339,7 +361,7 @@ def test_new_unconfirmed_inputs(self):
         tx2_hex = txToHex(tx2)
 
         # This will raise an exception
-        assert_raises_jsonrpc(-26, "replacement-adds-unconfirmed", self.nodes[0].sendrawtransaction, tx2_hex, True)
+        assert_raises_rpc_error(-26, "replacement-adds-unconfirmed", self.nodes[0].sendrawtransaction, tx2_hex, True)
 
     def test_too_many_replacements(self):
         """Replacements that evict too many transactions are rejected"""
@@ -385,7 +407,7 @@ def test_too_many_replacements(self):
         double_tx_hex = txToHex(double_tx)
 
         # This will raise an exception
-        assert_raises_jsonrpc(-26, "too many potential replacements", self.nodes[0].sendrawtransaction, double_tx_hex, True)
+        assert_raises_rpc_error(-26, "too many potential replacements", self.nodes[0].sendrawtransaction, double_tx_hex, True)
 
         # If we remove an input, it should pass
         double_tx = CTransaction()
@@ -412,7 +434,7 @@ def test_opt_in(self):
         tx1b_hex = txToHex(tx1b)
 
         # This will raise an exception
-        assert_raises_jsonrpc(-26, "txn-mempool-conflict", self.nodes[0].sendrawtransaction, tx1b_hex, True)
+        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[0].sendrawtransaction, tx1b_hex, True)
 
         tx1_outpoint = make_utxo(self.nodes[0], int(1.1*COIN))
 
@@ -430,7 +452,7 @@ def test_opt_in(self):
         tx2b_hex = txToHex(tx2b)
 
         # This will raise an exception
-        assert_raises_jsonrpc(-26, "txn-mempool-conflict", self.nodes[0].sendrawtransaction, tx2b_hex, True)
+        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[0].sendrawtransaction, tx2b_hex, True)
 
         # Now create a new transaction that spends from tx1a and tx2a
         # opt-in on one of the inputs
@@ -482,7 +504,7 @@ def test_prioritised_transactions(self):
         tx1b_hex = txToHex(tx1b)
 
         # Verify tx1b cannot replace tx1a.
-        assert_raises_jsonrpc(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, True)
 
         # Use prioritisetransaction to set tx1a's fee to 0.
         self.nodes[0].prioritisetransaction(txid=tx1a_txid, fee_delta=int(-0.1*COIN))
@@ -499,7 +521,7 @@ def test_prioritised_transactions(self):
         tx2a.vin = [CTxIn(tx1_outpoint, nSequence=0)]
         tx2a.vout = [CTxOut(1*COIN, CScript([b'a']))]
         tx2a_hex = txToHex(tx2a)
-        tx2a_txid = self.nodes[0].sendrawtransaction(tx2a_hex, True)
+        self.nodes[0].sendrawtransaction(tx2a_hex, True)
 
         # Lower fee, but we'll prioritise it
         tx2b = CTransaction()
@@ -509,7 +531,7 @@ def test_prioritised_transactions(self):
         tx2b_hex = txToHex(tx2b)
 
         # Verify tx2b cannot replace tx2a.
-        assert_raises_jsonrpc(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx2b_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx2b_hex, True)
 
         # Now prioritise tx2b to have a higher modified fee
         self.nodes[0].prioritisetransaction(txid=tx2b.hash, fee_delta=int(0.1*COIN))
diff --git a/test/functional/resendwallettransactions.py b/test/functional/resendwallettransactions.py
new file mode 100755
index 000000000..d959bb4c3
--- /dev/null
+++ b/test/functional/resendwallettransactions.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test resendwallettransactions RPC."""
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal, assert_raises_rpc_error
+
+class ResendWalletTransactionsTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 1
+        self.extra_args = [['--walletbroadcast=false']]
+
+    def run_test(self):
+        # Should raise RPC_WALLET_ERROR (-4) if walletbroadcast is disabled.
+        assert_raises_rpc_error(-4, "Error: Wallet transaction broadcasting is disabled with -walletbroadcast", self.nodes[0].resendwallettransactions)
+
+        # Should return an empty array if there aren't unconfirmed wallet transactions.
+        self.stop_node(0)
+        self.start_node(0, extra_args=[])
+        assert_equal(self.nodes[0].resendwallettransactions(), [])
+
+        # Should return an array with the unconfirmed wallet transaction.
+        txid = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 1)
+        assert_equal(self.nodes[0].resendwallettransactions(), [txid])
+
+if __name__ == '__main__':
+    ResendWalletTransactionsTest().main()
diff --git a/test/functional/rest.py b/test/functional/rest.py
index a69dbb501..437111a4d 100755
--- a/test/functional/rest.py
+++ b/test/functional/rest.py
@@ -43,8 +43,7 @@ def http_post_call(host, port, path, requestdata = '', response_object = 0):
 class RESTTest (BitcoinTestFramework):
     FORMAT_SEPARATOR = "."
 
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
 
diff --git a/test/functional/rpcbind_test.py b/test/functional/rpcbind_test.py
index 951685aa7..0e8c3fa20 100755
--- a/test/functional/rpcbind_test.py
+++ b/test/functional/rpcbind_test.py
@@ -11,19 +11,13 @@
 from test_framework.util import *
 from test_framework.netutil import *
 
-
 class RPCBindTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
 
     def setup_network(self):
-        pass
-
-    def setup_nodes(self):
-        pass
+        self.add_nodes(self.num_nodes, None)
 
     def run_bind_test(self, allow_ips, connect_to, addresses, expected):
         '''
@@ -31,13 +25,15 @@ def run_bind_test(self, allow_ips, connect_to, addresses, expected):
         then try to connect, and check if the set of bound addresses
         matches the expected set.
         '''
+        self.log.info("Bind test for %s" % str(addresses))
         expected = [(addr_to_hex(addr), port) for (addr, port) in expected]
         base_args = ['-disablewallet', '-nolisten']
         if allow_ips:
             base_args += ['-rpcallowip=' + x for x in allow_ips]
         binds = ['-rpcbind='+addr for addr in addresses]
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, [base_args + binds], connect_to)
-        pid = self.bitcoind_processes[0].pid
+        self.nodes[0].rpchost = connect_to
+        self.start_node(0, base_args + binds)
+        pid = self.nodes[0].process.pid
         assert_equal(set(get_bind_addrs(pid)), set(expected))
         self.stop_nodes()
 
@@ -46,10 +42,12 @@ def run_allowip_test(self, allow_ips, rpchost, rpcport):
         Start a node with rpcallow IP, and request getnetworkinfo
         at a non-localhost IP.
         '''
+        self.log.info("Allow IP test for %s:%d" % (rpchost, rpcport))
         base_args = ['-disablewallet', '-nolisten'] + ['-rpcallowip='+x for x in allow_ips]
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, [base_args])
+        self.nodes[0].rpchost = None
+        self.start_nodes([base_args])
         # connect to node through non-loopback interface
-        node = get_rpc_proxy(rpc_url(get_datadir_path(self.options.tmpdir, 0), 0, "%s:%d" % (rpchost, rpcport)), 0)
+        node = get_rpc_proxy(rpc_url(get_datadir_path(self.options.tmpdir, 0), 0, "%s:%d" % (rpchost, rpcport)), 0, coveragedir=self.options.coveragedir)
         node.getnetworkinfo()
         self.stop_nodes()
 
@@ -103,7 +101,7 @@ def run_test(self):
 
         # Check that with invalid rpcallowip, we are denied
         self.run_allowip_test([non_loopback_ip], non_loopback_ip, defaultport)
-        assert_raises_jsonrpc(-342, "non-JSON HTTP response with '403 Forbidden' from server", self.run_allowip_test, ['1.1.1.1'], non_loopback_ip, defaultport)
+        assert_raises_rpc_error(-342, "non-JSON HTTP response with '403 Forbidden' from server", self.run_allowip_test, ['1.1.1.1'], non_loopback_ip, defaultport)
 
 if __name__ == '__main__':
     RPCBindTest().main()
diff --git a/test/functional/rpcnamedargs.py b/test/functional/rpcnamedargs.py
index 3b286000a..c47212bdd 100755
--- a/test/functional/rpcnamedargs.py
+++ b/test/functional/rpcnamedargs.py
@@ -7,26 +7,19 @@
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
-    assert_raises_jsonrpc,
+    assert_raises_rpc_error,
 )
 
-
 class NamedArgumentTest(BitcoinTestFramework):
-    """
-    Test named arguments on RPC calls.
-    """
-
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = False
+    def set_test_params(self):
         self.num_nodes = 1
 
     def run_test(self):
         node = self.nodes[0]
-        h = node.help(command='getinfo')
-        assert(h.startswith('getinfo\n'))
+        h = node.help(command='getblockchaininfo')
+        assert(h.startswith('getblockchaininfo\n'))
 
-        assert_raises_jsonrpc(-8, 'Unknown named parameter', node.help, random='getinfo')
+        assert_raises_rpc_error(-8, 'Unknown named parameter', node.help, random='getblockchaininfo')
 
         h = node.getblockhash(height=0)
         node.getblock(blockhash=h)
diff --git a/test/functional/segwit.py b/test/functional/segwit.py
index 51eaa34a5..6ecade7cb 100755
--- a/test/functional/segwit.py
+++ b/test/functional/segwit.py
@@ -7,12 +7,11 @@
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import *
 from test_framework.mininode import sha256, CTransaction, CTxIn, COutPoint, CTxOut, COIN, ToHex, FromHex
-from test_framework.address import script_to_p2sh, key_to_p2pkh
+from test_framework.address import script_to_p2sh, key_to_p2pkh, key_to_p2sh_p2wpkh, key_to_p2wpkh, script_to_p2sh_p2wsh, script_to_p2wsh, program_to_witness
 from test_framework.script import CScript, OP_HASH160, OP_CHECKSIG, OP_0, hash160, OP_EQUAL, OP_DUP, OP_EQUALVERIFY, OP_1, OP_2, OP_CHECKMULTISIG, OP_TRUE
 from io import BytesIO
 
 NODE_0 = 0
-NODE_1 = 1
 NODE_2 = 2
 WIT_V0 = 0
 WIT_V1 = 1
@@ -34,15 +33,15 @@ def witness_script(use_p2wsh, pubkey):
 
 # Return a transaction (in hex) that spends the given utxo to a segwit output,
 # optionally wrapping the segwit output using P2SH.
-def create_witnessprogram(use_p2wsh, utxo, pubkey, encode_p2sh, amount):
-    pkscript = hex_str_to_bytes(witness_script(use_p2wsh, pubkey))
-    if (encode_p2sh):
-        p2sh_hash = hash160(pkscript)
-        pkscript = CScript([OP_HASH160, p2sh_hash, OP_EQUAL])
-    tx = CTransaction()
-    tx.vin.append(CTxIn(COutPoint(int(utxo["txid"], 16), utxo["vout"]), b""))
-    tx.vout.append(CTxOut(int(amount*COIN), pkscript))
-    return ToHex(tx)
+def create_witness_tx(node, use_p2wsh, utxo, pubkey, encode_p2sh, amount):
+    if use_p2wsh:
+        program = CScript([OP_1, hex_str_to_bytes(pubkey), OP_1, OP_CHECKMULTISIG])
+        addr = script_to_p2sh_p2wsh(program) if encode_p2sh else script_to_p2wsh(program)
+    else:
+        addr = key_to_p2sh_p2wpkh(pubkey) if encode_p2sh else key_to_p2wpkh(pubkey)
+    if not encode_p2sh:
+        assert_equal(node.validateaddress(addr)['scriptPubKey'], witness_script(use_p2wsh, pubkey))
+    return node.createrawtransaction([utxo], {addr: amount})
 
 # Create a transaction spending a given utxo to a segwit output corresponding
 # to the given pubkey: use_p2wsh determines whether to use P2WPKH or P2WSH;
@@ -50,7 +49,7 @@ def create_witnessprogram(use_p2wsh, utxo, pubkey, encode_p2sh, amount):
 # sign=True will have the given node sign the transaction.
 # insert_redeem_script will be added to the scriptSig, if given.
 def send_to_witness(use_p2wsh, node, utxo, pubkey, encode_p2sh, amount, sign=True, insert_redeem_script=""):
-    tx_to_witness = create_witnessprogram(use_p2wsh, utxo, pubkey, encode_p2sh, amount)
+    tx_to_witness = create_witness_tx(node, use_p2wsh, utxo, pubkey, encode_p2sh, amount)
     if (sign):
         signed = node.signrawtransaction(tx_to_witness)
         assert("errors" not in signed or len(["errors"]) == 0)
@@ -75,9 +74,7 @@ def find_unspent(node, min_value):
             return utxo
 
 class SegWitTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
         self.extra_args = [["-walletprematurewitness", "-rpcserialversion=0"],
@@ -102,11 +99,11 @@ def skip_mine(self, node, txid, sign, redeem_script=""):
         sync_blocks(self.nodes)
 
     def fail_accept(self, node, error_msg, txid, sign, redeem_script=""):
-        assert_raises_jsonrpc(-26, error_msg, send_to_witness, 1, node, getutxo(txid), self.pubkey[0], False, Decimal("49.998"), sign, redeem_script)
+        assert_raises_rpc_error(-26, error_msg, send_to_witness, 1, node, getutxo(txid), self.pubkey[0], False, Decimal("49.998"), sign, redeem_script)
 
     def fail_mine(self, node, txid, sign, redeem_script=""):
         send_to_witness(1, node, getutxo(txid), self.pubkey[0], False, Decimal("49.998"), sign, redeem_script)
-        assert_raises_jsonrpc(-1, "CreateNewBlock: TestBlockValidity failed", node.generate, 1)
+        assert_raises_rpc_error(-1, "CreateNewBlock: TestBlockValidity failed", node.generate, 1)
         sync_blocks(self.nodes)
 
     def run_test(self):
@@ -136,8 +133,15 @@ def run_test(self):
             newaddress = self.nodes[i].getnewaddress()
             self.pubkey.append(self.nodes[i].validateaddress(newaddress)["pubkey"])
             multiaddress = self.nodes[i].addmultisigaddress(1, [self.pubkey[-1]])
-            self.nodes[i].addwitnessaddress(newaddress)
-            self.nodes[i].addwitnessaddress(multiaddress)
+            multiscript = CScript([OP_1, hex_str_to_bytes(self.pubkey[-1]), OP_1, OP_CHECKMULTISIG])
+            p2sh_addr = self.nodes[i].addwitnessaddress(newaddress, True)
+            bip173_addr = self.nodes[i].addwitnessaddress(newaddress, False)
+            p2sh_ms_addr = self.nodes[i].addwitnessaddress(multiaddress, True)
+            bip173_ms_addr = self.nodes[i].addwitnessaddress(multiaddress, False)
+            assert_equal(p2sh_addr, key_to_p2sh_p2wpkh(self.pubkey[-1]))
+            assert_equal(bip173_addr, key_to_p2wpkh(self.pubkey[-1]))
+            assert_equal(p2sh_ms_addr, script_to_p2sh_p2wsh(multiscript))
+            assert_equal(bip173_ms_addr, script_to_p2wsh(multiscript))
             p2sh_ids.append([])
             wit_ids.append([])
             for v in range(2):
@@ -282,6 +286,9 @@ def run_test(self):
         assert(txid2 in template_txids)
         assert(txid3 in template_txids)
 
+        # Check that wtxid is properly reported in mempool entry
+        assert_equal(int(self.nodes[0].getmempoolentry(txid3)["wtxid"], 16), tx.calc_sha256(True))
+
         # Mine a block to clear the gbt cache again.
         self.nodes[0].generate(1)
 
@@ -445,11 +452,7 @@ def run_test(self):
         for i in importlist:
             # import all generated addresses. The wallet already has the private keys for some of these, so catch JSON RPC
             # exceptions and continue.
-            try:
-                self.nodes[0].importaddress(i,"",False,True)
-            except JSONRPCException as exp:
-                assert_equal(exp.error["message"], "The wallet already contains the private key for this address or script")
-                assert_equal(exp.error["code"], -4)
+            try_rpc(-4, "The wallet already contains the private key for this address or script", self.nodes[0].importaddress, i, "", False, True)
 
         self.nodes[0].importaddress(script_to_p2sh(op0)) # import OP_0 as address only
         self.nodes[0].importaddress(multisig_without_privkey_address) # Test multisig_without_privkey
@@ -462,7 +465,7 @@ def run_test(self):
         # addwitnessaddress should refuse to return a witness address if an uncompressed key is used
         # note that no witness address should be returned by unsolvable addresses
         for i in uncompressed_spendable_address + uncompressed_solvable_address + unknown_address + unsolvable_address:
-            assert_raises_jsonrpc(-4, "Public key or redeemscript not known to wallet, or the key is uncompressed", self.nodes[0].addwitnessaddress, i)
+            assert_raises_rpc_error(-4, "Public key or redeemscript not known to wallet, or the key is uncompressed", self.nodes[0].addwitnessaddress, i)
 
         # addwitnessaddress should return a witness addresses even if keys are not in the wallet
         self.nodes[0].addwitnessaddress(multisig_without_privkey_address)
@@ -545,7 +548,7 @@ def run_test(self):
         # premature_witaddress are not accepted until the script is added with addwitnessaddress first
         for i in uncompressed_spendable_address + uncompressed_solvable_address + premature_witaddress:
             # This will raise an exception
-            assert_raises_jsonrpc(-4, "Public key or redeemscript not known to wallet, or the key is uncompressed", self.nodes[0].addwitnessaddress, i)
+            assert_raises_rpc_error(-4, "Public key or redeemscript not known to wallet, or the key is uncompressed", self.nodes[0].addwitnessaddress, i)
 
         # after importaddress it should pass addwitnessaddress
         v = self.nodes[0].validateaddress(compressed_solvable_address[1])
@@ -558,6 +561,13 @@ def run_test(self):
         solvable_txid.append(self.mine_and_test_listunspent(solvable_after_addwitnessaddress, 1))
         self.mine_and_test_listunspent(unseen_anytime, 0)
 
+        # Check that createrawtransaction/decoderawtransaction with non-v0 Bech32 works
+        v1_addr = program_to_witness(1, [3,5])
+        v1_tx = self.nodes[0].createrawtransaction([getutxo(spendable_txid[0])],{v1_addr: 1})
+        v1_decoded = self.nodes[1].decoderawtransaction(v1_tx)
+        assert_equal(v1_decoded['vout'][0]['scriptPubKey']['addresses'][0], v1_addr)
+        assert_equal(v1_decoded['vout'][0]['scriptPubKey']['hex'], "51020305")
+
         # Check that spendable outputs are really spendable
         self.create_and_mine_tx_from_txids(spendable_txid)
 
@@ -570,6 +580,29 @@ def run_test(self):
         self.nodes[0].importprivkey("cTW5mR5M45vHxXkeChZdtSPozrFwFgmEvTNnanCW6wrqwaCZ1X7K")
         self.create_and_mine_tx_from_txids(solvable_txid)
 
+        # Test that importing native P2WPKH/P2WSH scripts works
+        for use_p2wsh in [False, True]:
+            if use_p2wsh:
+                scriptPubKey = "00203a59f3f56b713fdcf5d1a57357f02c44342cbf306ffe0c4741046837bf90561a"
+                transaction = "01000000000100e1f505000000002200203a59f3f56b713fdcf5d1a57357f02c44342cbf306ffe0c4741046837bf90561a00000000"
+            else:
+                scriptPubKey = "a9142f8c469c2f0084c48e11f998ffbe7efa7549f26d87"
+                transaction = "01000000000100e1f5050000000017a9142f8c469c2f0084c48e11f998ffbe7efa7549f26d8700000000"
+
+            self.nodes[1].importaddress(scriptPubKey, "", False)
+            rawtxfund = self.nodes[1].fundrawtransaction(transaction)['hex']
+            rawtxfund = self.nodes[1].signrawtransaction(rawtxfund)["hex"]
+            txid = self.nodes[1].sendrawtransaction(rawtxfund)
+
+            assert_equal(self.nodes[1].gettransaction(txid, True)["txid"], txid)
+            assert_equal(self.nodes[1].listtransactions("*", 1, 0, True)[0]["txid"], txid)
+
+            # Assert it is properly saved
+            self.stop_node(1)
+            self.start_node(1)
+            assert_equal(self.nodes[1].gettransaction(txid, True)["txid"], txid)
+            assert_equal(self.nodes[1].listtransactions("*", 1, 0, True)[0]["txid"], txid)
+
     def mine_and_test_listunspent(self, script_list, ismine):
         utxo = find_unspent(self.nodes[0], 50)
         tx = CTransaction()
diff --git a/test/functional/sendheaders.py b/test/functional/sendheaders.py
index 44c357c6d..60d107b24 100755
--- a/test/functional/sendheaders.py
+++ b/test/functional/sendheaders.py
@@ -121,9 +121,6 @@ def on_headers(self, conn, message):
             message.headers[-1].calc_sha256()
             self.last_blockhash_announced = message.headers[-1].sha256
 
-    def on_block(self, conn, message):
-        self.last_message["block"].calc_sha256()
-
     # Test whether the last announcement we received had the
     # right header or the right inv
     # inv and headers should be lists of block hashes
@@ -131,7 +128,7 @@ def check_last_announcement(self, headers=None, inv=None):
         expect_headers = headers if headers != None else []
         expect_inv = inv if inv != None else []
         test_function = lambda: self.block_announced
-        assert(wait_until(test_function, timeout=60))
+        wait_until(test_function, timeout=60, lock=mininode_lock)
         with mininode_lock:
             self.block_announced = False
 
@@ -158,12 +155,12 @@ def wait_for_getdata(self, hash_list, timeout=60):
             return
 
         test_function = lambda: "getdata" in self.last_message and [x.hash for x in self.last_message["getdata"].inv] == hash_list
-        assert(wait_until(test_function, timeout=timeout))
+        wait_until(test_function, timeout=timeout, lock=mininode_lock)
         return
 
     def wait_for_block_announcement(self, block_hash, timeout=60):
         test_function = lambda: self.last_blockhash_announced == block_hash
-        assert(wait_until(test_function, timeout=timeout))
+        wait_until(test_function, timeout=timeout, lock=mininode_lock)
         return
 
     def send_header_for_blocks(self, new_blocks):
@@ -177,8 +174,7 @@ def send_getblocks(self, locator):
         self.send_message(getblocks_message)
 
 class SendHeadersTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
 
@@ -229,6 +225,10 @@ def run_test(self):
         inv_node.wait_for_verack()
         test_node.wait_for_verack()
 
+        # Ensure verack's have been processed by our peer
+        inv_node.sync_with_ping()
+        test_node.sync_with_ping()
+
         tip = int(self.nodes[0].getbestblockhash(), 16)
 
         # PART 1
diff --git a/test/functional/signmessages.py b/test/functional/signmessages.py
index 42f6a9daa..52ba6a5ad 100755
--- a/test/functional/signmessages.py
+++ b/test/functional/signmessages.py
@@ -5,31 +5,34 @@
 """Test RPC commands for signing and verifying messages."""
 
 from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal
 
 class SignMessagesTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
 
     def run_test(self):
         message = 'This is just a test message'
 
-        # Test the signing with a privkey
-        privKey = 'cUeKHd5orzT3mz8P9pxyREHfsWtVfgsfDjiZZBcjUBAaGk1BTj7N'
+        self.log.info('test signing with priv_key')
+        priv_key = 'cUeKHd5orzT3mz8P9pxyREHfsWtVfgsfDjiZZBcjUBAaGk1BTj7N'
         address = 'mpLQjfK79b7CCV4VMJWEWAj5Mpx8Up5zxB'
-        signature = self.nodes[0].signmessagewithprivkey(privKey, message)
-
-        # Verify the message
+        expected_signature = 'INbVnW4e6PeRmsv2Qgu8NuopvrVjkcxob+sX8OcZG0SALhWybUjzMLPdAsXI46YZGb0KQTRii+wWIQzRpG/U+S0='
+        signature = self.nodes[0].signmessagewithprivkey(priv_key, message)
+        assert_equal(expected_signature, signature)
         assert(self.nodes[0].verifymessage(address, signature, message))
 
-        # Test the signing with an address with wallet
+        self.log.info('test signing with an address with wallet')
         address = self.nodes[0].getnewaddress()
         signature = self.nodes[0].signmessage(address, message)
-
-        # Verify the message
         assert(self.nodes[0].verifymessage(address, signature, message))
 
+        self.log.info('test verifying with another address should not work')
+        other_address = self.nodes[0].getnewaddress()
+        other_signature = self.nodes[0].signmessage(other_address, message)
+        assert(not self.nodes[0].verifymessage(other_address, signature, message))
+        assert(not self.nodes[0].verifymessage(address, other_signature, message))
+
 if __name__ == '__main__':
     SignMessagesTest().main()
diff --git a/test/functional/signrawtransactions.py b/test/functional/signrawtransactions.py
index 415727268..9a45d53cb 100755
--- a/test/functional/signrawtransactions.py
+++ b/test/functional/signrawtransactions.py
@@ -9,8 +9,7 @@
 
 
 class SignRawTransactionsTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
 
@@ -83,7 +82,7 @@ def script_verification_error_test(self):
             assert_equal(decodedRawTx["vin"][i]["vout"], inp["vout"])
 
         # Make sure decoderawtransaction throws if there is extra data
-        assert_raises(JSONRPCException, self.nodes[0].decoderawtransaction, rawTx + "00")
+        assert_raises_rpc_error(-22, "TX decode failed", self.nodes[0].decoderawtransaction, rawTx + "00")
 
         rawTxSigned = self.nodes[0].signrawtransaction(rawTx, scripts, privKeys)
 
diff --git a/test/functional/smartfees.py b/test/functional/smartfees.py
index bc42a319d..986f4546a 100755
--- a/test/functional/smartfees.py
+++ b/test/functional/smartfees.py
@@ -141,11 +141,8 @@ def check_estimates(node, fees_seen, max_invalid, print_estimates = True):
 
 
 class EstimateFeeTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 3
-        self.setup_clean_chain = False
 
     def setup_network(self):
         """
@@ -153,57 +150,16 @@ def setup_network(self):
         But first we need to use one node to create a lot of outputs
         which we will use to generate our transactions.
         """
-        self.nodes = []
+        self.add_nodes(3, extra_args=[["-maxorphantx=1000", "-whitelist=127.0.0.1"],
+                                      ["-blockmaxsize=17000", "-maxorphantx=1000", "-deprecatedrpc=estimatefee"],
+                                      ["-blockmaxsize=8000", "-maxorphantx=1000"]])
         # Use node0 to mine blocks for input splitting
-        self.nodes.append(self.start_node(0, self.options.tmpdir, ["-maxorphantx=1000",
-                                                              "-whitelist=127.0.0.1"]))
-
-        self.log.info("This test is time consuming, please be patient")
-        self.log.info("Splitting inputs so we can generate tx's")
-        self.txouts = []
-        self.txouts2 = []
-        # Split a coinbase into two transaction puzzle outputs
-        split_inputs(self.nodes[0], self.nodes[0].listunspent(0), self.txouts, True)
-
-        # Mine
-        while (len(self.nodes[0].getrawmempool()) > 0):
-            self.nodes[0].generate(1)
-
-        # Repeatedly split those 2 outputs, doubling twice for each rep
-        # Use txouts to monitor the available utxo, since these won't be tracked in wallet
-        reps = 0
-        while (reps < 5):
-            #Double txouts to txouts2
-            while (len(self.txouts)>0):
-                split_inputs(self.nodes[0], self.txouts, self.txouts2)
-            while (len(self.nodes[0].getrawmempool()) > 0):
-                self.nodes[0].generate(1)
-            #Double txouts2 to txouts
-            while (len(self.txouts2)>0):
-                split_inputs(self.nodes[0], self.txouts2, self.txouts)
-            while (len(self.nodes[0].getrawmempool()) > 0):
-                self.nodes[0].generate(1)
-            reps += 1
-        self.log.info("Finished splitting")
-
-        # Now we can connect the other nodes, didn't want to connect them earlier
-        # so the estimates would not be affected by the splitting transactions
         # Node1 mines small blocks but that are bigger than the expected transaction rate.
         # NOTE: the CreateNewBlock code starts counting block size at 1,000 bytes,
         # (17k is room enough for 110 or so transactions)
-        self.nodes.append(self.start_node(1, self.options.tmpdir,
-                                     ["-blockmaxsize=17000", "-maxorphantx=1000"]))
-        connect_nodes(self.nodes[1], 0)
-
         # Node2 is a stingy miner, that
         # produces too small blocks (room for only 55 or so transactions)
-        node2args = ["-blockmaxsize=8000", "-maxorphantx=1000"]
 
-        self.nodes.append(self.start_node(2, self.options.tmpdir, node2args))
-        connect_nodes(self.nodes[0], 2)
-        connect_nodes(self.nodes[2], 1)
-
-        self.sync_all()
 
     def transact_and_mine(self, numblocks, mining_node):
         min_fee = Decimal("0.00001")
@@ -232,9 +188,51 @@ def transact_and_mine(self, numblocks, mining_node):
             self.memutxo = newmem
 
     def run_test(self):
+        self.log.info("This test is time consuming, please be patient")
+        self.log.info("Splitting inputs so we can generate tx's")
+
         # Make log handler available to helper functions
         global log
         log = self.log
+
+        # Start node0
+        self.start_node(0)
+        self.txouts = []
+        self.txouts2 = []
+        # Split a coinbase into two transaction puzzle outputs
+        split_inputs(self.nodes[0], self.nodes[0].listunspent(0), self.txouts, True)
+
+        # Mine
+        while (len(self.nodes[0].getrawmempool()) > 0):
+            self.nodes[0].generate(1)
+
+        # Repeatedly split those 2 outputs, doubling twice for each rep
+        # Use txouts to monitor the available utxo, since these won't be tracked in wallet
+        reps = 0
+        while (reps < 5):
+            #Double txouts to txouts2
+            while (len(self.txouts)>0):
+                split_inputs(self.nodes[0], self.txouts, self.txouts2)
+            while (len(self.nodes[0].getrawmempool()) > 0):
+                self.nodes[0].generate(1)
+            #Double txouts2 to txouts
+            while (len(self.txouts2)>0):
+                split_inputs(self.nodes[0], self.txouts2, self.txouts)
+            while (len(self.nodes[0].getrawmempool()) > 0):
+                self.nodes[0].generate(1)
+            reps += 1
+        self.log.info("Finished splitting")
+
+        # Now we can connect the other nodes, didn't want to connect them earlier
+        # so the estimates would not be affected by the splitting transactions
+        self.start_node(1)
+        self.start_node(2)
+        connect_nodes(self.nodes[1], 0)
+        connect_nodes(self.nodes[0], 2)
+        connect_nodes(self.nodes[2], 1)
+
+        self.sync_all()
+
         self.fees_per_kb = []
         self.memutxo = []
         self.confutxo = self.txouts # Start with the set of confirmed txouts after splitting
diff --git a/test/functional/test_framework/address.py b/test/functional/test_framework/address.py
index 96bebe1ea..2e2db5ffb 100644
--- a/test/functional/test_framework/address.py
+++ b/test/functional/test_framework/address.py
@@ -7,6 +7,8 @@
 from .script import hash256, hash160, sha256, CScript, OP_0
 from .util import bytes_to_hex_str, hex_str_to_bytes
 
+from . import segwit_addr
+
 chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
 
 def byte_to_base58(b, version):
@@ -49,6 +51,22 @@ def key_to_p2sh_p2wpkh(key, main = False):
     p2shscript = CScript([OP_0, hash160(key)])
     return script_to_p2sh(p2shscript, main)
 
+def program_to_witness(version, program, main = False):
+    if (type(program) is str):
+        program = hex_str_to_bytes(program)
+    assert 0 <= version <= 16
+    assert 2 <= len(program) <= 40
+    assert version > 0 or len(program) in [20, 32]
+    return segwit_addr.encode("bc" if main else "bcrt", version, program)
+
+def script_to_p2wsh(script, main = False):
+    script = check_script(script)
+    return program_to_witness(0, sha256(script), main)
+
+def key_to_p2wpkh(key, main = False):
+    key = check_key(key)
+    return program_to_witness(0, hash160(key), main)
+
 def script_to_p2sh_p2wsh(script, main = False):
     script = check_script(script)
     p2shscript = CScript([OP_0, sha256(script)])
diff --git a/test/functional/test_framework/authproxy.py b/test/functional/test_framework/authproxy.py
index b3671cbdc..bd3a3b3fa 100644
--- a/test/functional/test_framework/authproxy.py
+++ b/test/functional/test_framework/authproxy.py
@@ -33,24 +33,17 @@
 - uses standard Python json lib
 """
 
-try:
-    import http.client as httplib
-except ImportError:
-    import httplib
 import base64
 import decimal
+import http.client
 import json
 import logging
 import socket
 import time
-try:
-    import urllib.parse as urlparse
-except ImportError:
-    import urlparse
-
-USER_AGENT = "AuthServiceProxy/0.1"
+import urllib.parse
 
 HTTP_TIMEOUT = 30
+USER_AGENT = "AuthServiceProxy/0.1"
 
 log = logging.getLogger("BitcoinRPC")
 
@@ -60,7 +53,7 @@ def __init__(self, rpc_error):
             errmsg = '%(message)s (%(code)i)' % rpc_error
         except (KeyError, TypeError):
             errmsg = ''
-        Exception.__init__(self, errmsg)
+        super().__init__(errmsg)
         self.error = rpc_error
 
 
@@ -69,28 +62,18 @@ def EncodeDecimal(o):
         return str(o)
     raise TypeError(repr(o) + " is not JSON serializable")
 
-class AuthServiceProxy(object):
+class AuthServiceProxy():
     __id_count = 0
 
     # ensure_ascii: escape unicode as \uXXXX, passed to json.dumps
     def __init__(self, service_url, service_name=None, timeout=HTTP_TIMEOUT, connection=None, ensure_ascii=True):
         self.__service_url = service_url
         self._service_name = service_name
-        self.ensure_ascii = ensure_ascii # can be toggled on the fly by tests
-        self.__url = urlparse.urlparse(service_url)
-        if self.__url.port is None:
-            port = 80
-        else:
-            port = self.__url.port
-        (user, passwd) = (self.__url.username, self.__url.password)
-        try:
-            user = user.encode('utf8')
-        except AttributeError:
-            pass
-        try:
-            passwd = passwd.encode('utf8')
-        except AttributeError:
-            pass
+        self.ensure_ascii = ensure_ascii  # can be toggled on the fly by tests
+        self.__url = urllib.parse.urlparse(service_url)
+        port = 80 if self.__url.port is None else self.__url.port
+        user = None if self.__url.username is None else self.__url.username.encode('utf8')
+        passwd = None if self.__url.password is None else self.__url.password.encode('utf8')
         authpair = user + b':' + passwd
         self.__auth_header = b'Basic ' + base64.b64encode(authpair)
 
@@ -98,11 +81,9 @@ def __init__(self, service_url, service_name=None, timeout=HTTP_TIMEOUT, connect
             # Callables re-use the connection of the original proxy
             self.__conn = connection
         elif self.__url.scheme == 'https':
-            self.__conn = httplib.HTTPSConnection(self.__url.hostname, port,
-                                                  timeout=timeout)
+            self.__conn = http.client.HTTPSConnection(self.__url.hostname, port, timeout=timeout)
         else:
-            self.__conn = httplib.HTTPConnection(self.__url.hostname, port,
-                                                 timeout=timeout)
+            self.__conn = http.client.HTTPConnection(self.__url.hostname, port, timeout=timeout)
 
     def __getattr__(self, name):
         if name.startswith('__') and name.endswith('__'):
@@ -124,31 +105,34 @@ def _request(self, method, path, postdata):
         try:
             self.__conn.request(method, path, postdata, headers)
             return self._get_response()
-        except httplib.BadStatusLine as e:
-            if e.line == "''": # if connection was closed, try again
+        except http.client.BadStatusLine as e:
+            if e.line == "''":  # if connection was closed, try again
                 self.__conn.close()
                 self.__conn.request(method, path, postdata, headers)
                 return self._get_response()
             else:
                 raise
-        except (BrokenPipeError,ConnectionResetError):
+        except (BrokenPipeError, ConnectionResetError):
             # Python 3.5+ raises BrokenPipeError instead of BadStatusLine when the connection was reset
             # ConnectionResetError happens on FreeBSD with Python 3.4
             self.__conn.close()
             self.__conn.request(method, path, postdata, headers)
             return self._get_response()
 
-    def __call__(self, *args, **argsn):
+    def get_request(self, *args, **argsn):
         AuthServiceProxy.__id_count += 1
 
-        log.debug("-%s-> %s %s"%(AuthServiceProxy.__id_count, self._service_name,
-                                 json.dumps(args, default=EncodeDecimal, ensure_ascii=self.ensure_ascii)))
+        log.debug("-%s-> %s %s" % (AuthServiceProxy.__id_count, self._service_name,
+                                   json.dumps(args, default=EncodeDecimal, ensure_ascii=self.ensure_ascii)))
         if args and argsn:
             raise ValueError('Cannot handle both named and positional arguments')
-        postdata = json.dumps({'version': '1.1',
-                               'method': self._service_name,
-                               'params': args or argsn,
-                               'id': AuthServiceProxy.__id_count}, default=EncodeDecimal, ensure_ascii=self.ensure_ascii)
+        return {'version': '1.1',
+                'method': self._service_name,
+                'params': args or argsn,
+                'id': AuthServiceProxy.__id_count}
+
+    def __call__(self, *args, **argsn):
+        postdata = json.dumps(self.get_request(*args, **argsn), default=EncodeDecimal, ensure_ascii=self.ensure_ascii)
         response = self._request('POST', self.__url.path, postdata.encode('utf-8'))
         if response['error'] is not None:
             raise JSONRPCException(response['error'])
@@ -158,9 +142,9 @@ def __call__(self, *args, **argsn):
         else:
             return response['result']
 
-    def _batch(self, rpc_call_list):
+    def batch(self, rpc_call_list):
         postdata = json.dumps(list(rpc_call_list), default=EncodeDecimal, ensure_ascii=self.ensure_ascii)
-        log.debug("--> "+postdata)
+        log.debug("--> " + postdata)
         return self._request('POST', self.__url.path, postdata.encode('utf-8'))
 
     def _get_response(self):
@@ -187,9 +171,9 @@ def _get_response(self):
         response = json.loads(responsedata, parse_float=decimal.Decimal)
         elapsed = time.time() - req_start_time
         if "error" in response and response["error"] is None:
-            log.debug("<-%s- [%.6f] %s"%(response["id"], elapsed, json.dumps(response["result"], default=EncodeDecimal, ensure_ascii=self.ensure_ascii)))
+            log.debug("<-%s- [%.6f] %s" % (response["id"], elapsed, json.dumps(response["result"], default=EncodeDecimal, ensure_ascii=self.ensure_ascii)))
         else:
-            log.debug("<-- [%.6f] %s"%(elapsed,responsedata))
+            log.debug("<-- [%.6f] %s" % (elapsed, responsedata))
         return response
 
     def __truediv__(self, relative_uri):
diff --git a/test/functional/test_framework/bignum.py b/test/functional/test_framework/bignum.py
index 024611da6..db5ccd62c 100644
--- a/test/functional/test_framework/bignum.py
+++ b/test/functional/test_framework/bignum.py
@@ -26,12 +26,6 @@ def bn2bin(v):
         i -= 1
     return s
 
-def bin2bn(s):
-    l = 0
-    for ch in s:
-        l = (l << 8) | ch
-    return l
-
 def bn2mpi(v):
     have_ext = False
     if v.bit_length() > 0:
@@ -54,30 +48,6 @@ def bn2mpi(v):
             v_bin[0] |= 0x80
     return s + ext + v_bin
 
-def mpi2bn(s):
-    if len(s) < 4:
-        return None
-    s_size = bytes(s[:4])
-    v_len = struct.unpack(b">I", s_size)[0]
-    if len(s) != (v_len + 4):
-        return None
-    if v_len == 0:
-        return 0
-
-    v_str = bytearray(s[4:])
-    neg = False
-    i = v_str[0]
-    if i & 0x80:
-        neg = True
-        i &= ~0x80
-        v_str[0] = i
-
-    v = bin2bn(v_str)
-
-    if neg:
-        return -v
-    return v
-
 # bitcoin-specific little endian format, with implicit size
 def mpi2vch(s):
     r = s[4:]           # strip size
@@ -86,12 +56,3 @@ def mpi2vch(s):
 
 def bn2vch(v):
     return bytes(mpi2vch(bn2mpi(v)))
-
-def vch2mpi(s):
-    r = struct.pack(b">I", len(s))   # size
-    r += s[::-1]            # reverse string, converting LE->BE
-    return r
-
-def vch2bn(s):
-    return mpi2bn(vch2mpi(s))
-
diff --git a/test/functional/test_framework/blockstore.py b/test/functional/test_framework/blockstore.py
index 4cfd682bb..ad0472248 100644
--- a/test/functional/test_framework/blockstore.py
+++ b/test/functional/test_framework/blockstore.py
@@ -10,7 +10,7 @@
 
 logger = logging.getLogger("TestFramework.blockstore")
 
-class BlockStore(object):
+class BlockStore():
     """BlockStore helper class.
 
     BlockStore keeps a map of blocks and implements helper functions for
@@ -127,7 +127,7 @@ def get_locator(self, current_tip=None):
         locator.vHave = r
         return locator
 
-class TxStore(object):
+class TxStore():
     def __init__(self, datadir):
         self.txDB = dbmd.open(datadir + "/transactions", 'c')
 
@@ -143,16 +143,6 @@ def get(self, txhash):
             return None
         return value
 
-    def get_transaction(self, txhash):
-        ret = None
-        serialized_tx = self.get(txhash)
-        if serialized_tx is not None:
-            f = BytesIO(serialized_tx)
-            ret = CTransaction()
-            ret.deserialize(f)
-            ret.calc_sha256()
-        return ret
-
     def add_transaction(self, tx):
         tx.calc_sha256()
         try:
diff --git a/test/functional/test_framework/comptool.py b/test/functional/test_framework/comptool.py
index 9f062865a..b0417e02d 100755
--- a/test/functional/test_framework/comptool.py
+++ b/test/functional/test_framework/comptool.py
@@ -19,7 +19,7 @@
 
 from .mininode import *
 from .blockstore import BlockStore, TxStore
-from .util import p2p_port
+from .util import p2p_port, wait_until
 
 import logging
 
@@ -27,7 +27,7 @@
 
 global mininode_lock
 
-class RejectResult(object):
+class RejectResult():
     """Outcome that expects rejection of a transaction or block."""
     def __init__(self, code, reason=b''):
         self.code = code
@@ -156,13 +156,13 @@ def send_mempool(self):
 #    across all connections.  (If outcome of final tx is specified as true
 #    or false, then only the last tx is tested against outcome.)
 
-class TestInstance(object):
+class TestInstance():
     def __init__(self, objects=None, sync_every_block=True, sync_every_tx=False):
         self.blocks_and_transactions = objects if objects else []
         self.sync_every_block = sync_every_block
         self.sync_every_tx = sync_every_tx
 
-class TestManager(object):
+class TestManager():
 
     def __init__(self, testgen, datadir):
         self.test_generator = testgen
@@ -189,7 +189,7 @@ def clear_all_connections(self):
     def wait_for_disconnections(self):
         def disconnected():
             return all(node.closed for node in self.test_nodes)
-        return wait_until(disconnected, timeout=10)
+        wait_until(disconnected, timeout=10, lock=mininode_lock)
 
     def wait_for_verack(self):
         return all(node.wait_for_verack() for node in self.test_nodes)
@@ -197,7 +197,7 @@ def wait_for_verack(self):
     def wait_for_pings(self, counter):
         def received_pongs():
             return all(node.received_ping_response(counter) for node in self.test_nodes)
-        return wait_until(received_pongs)
+        wait_until(received_pongs, lock=mininode_lock)
 
     # sync_blocks: Wait for all connections to request the blockhash given
     # then send get_headers to find out the tip of each node, and synchronize
@@ -210,8 +210,7 @@ def blocks_requested():
             )
 
         # --> error if not requested
-        if not wait_until(blocks_requested, attempts=20*num_blocks):
-            raise AssertionError("Not all nodes requested block")
+        wait_until(blocks_requested, attempts=20*num_blocks, lock=mininode_lock)
 
         # Send getheaders message
         [ c.cb.send_getheaders() for c in self.connections ]
@@ -231,8 +230,7 @@ def transaction_requested():
             )
 
         # --> error if not requested
-        if not wait_until(transaction_requested, attempts=20*num_events):
-            raise AssertionError("Not all nodes requested transaction")
+        wait_until(transaction_requested, attempts=20*num_events, lock=mininode_lock)
 
         # Get the mempool
         [ c.cb.send_mempool() for c in self.connections ]
diff --git a/test/functional/test_framework/coverage.py b/test/functional/test_framework/coverage.py
index 227b1a17a..ddc3c515b 100644
--- a/test/functional/test_framework/coverage.py
+++ b/test/functional/test_framework/coverage.py
@@ -14,7 +14,7 @@
 REFERENCE_FILENAME = 'rpc_interface.txt'
 
 
-class AuthServiceProxyWrapper(object):
+class AuthServiceProxyWrapper():
     """
     An object that wraps AuthServiceProxy to record specific RPC calls.
 
@@ -31,10 +31,11 @@ def __init__(self, auth_service_proxy_instance, coverage_logfile=None):
         self.auth_service_proxy_instance = auth_service_proxy_instance
         self.coverage_logfile = coverage_logfile
 
-    def __getattr__(self, *args, **kwargs):
-        return_val = self.auth_service_proxy_instance.__getattr__(
-            *args, **kwargs)
-
+    def __getattr__(self, name):
+        return_val = getattr(self.auth_service_proxy_instance, name)
+        if not isinstance(return_val, type(self.auth_service_proxy_instance)):
+            # If proxy getattr returned an unwrapped value, do the same here.
+            return return_val
         return AuthServiceProxyWrapper(return_val, self.coverage_logfile)
 
     def __call__(self, *args, **kwargs):
@@ -44,20 +45,23 @@ def __call__(self, *args, **kwargs):
 
         """
         return_val = self.auth_service_proxy_instance.__call__(*args, **kwargs)
+        self._log_call()
+        return return_val
+
+    def _log_call(self):
         rpc_method = self.auth_service_proxy_instance._service_name
 
         if self.coverage_logfile:
             with open(self.coverage_logfile, 'a+', encoding='utf8') as f:
                 f.write("%s\n" % rpc_method)
 
-        return return_val
-
-    @property
-    def url(self):
-        return self.auth_service_proxy_instance.url
-
     def __truediv__(self, relative_uri):
-        return AuthServiceProxyWrapper(self.auth_service_proxy_instance / relative_uri)
+        return AuthServiceProxyWrapper(self.auth_service_proxy_instance / relative_uri,
+                                       self.coverage_logfile)
+
+    def get_request(self, *args, **kwargs):
+        self._log_call()
+        return self.auth_service_proxy_instance.get_request(*args, **kwargs)
 
 def get_filename(dirname, n_node):
     """
diff --git a/test/functional/test_framework/key.py b/test/functional/test_framework/key.py
index 85a6158a2..aa91fb5b0 100644
--- a/test/functional/test_framework/key.py
+++ b/test/functional/test_framework/key.py
@@ -84,7 +84,7 @@ def _check_result(val, func, args):
 ssl.EC_KEY_new_by_curve_name.restype = ctypes.c_void_p
 ssl.EC_KEY_new_by_curve_name.errcheck = _check_result
 
-class CECKey(object):
+class CECKey():
     """Wrapper around OpenSSL's EC_KEY"""
 
     POINT_CONVERSION_COMPRESSED = 2
diff --git a/test/functional/test_framework/mininode.py b/test/functional/test_framework/mininode.py
index a4d85501e..345ecfe76 100755
--- a/test/functional/test_framework/mininode.py
+++ b/test/functional/test_framework/mininode.py
@@ -35,7 +35,7 @@
 from threading import RLock, Thread
 
 from test_framework.siphash import siphash256
-from test_framework.util import hex_str_to_bytes, bytes_to_hex_str
+from test_framework.util import hex_str_to_bytes, bytes_to_hex_str, wait_until
 
 BIP0031_VERSION = 60000
 MY_VERSION = 70014  # past bip-31 for ping/pong
@@ -48,8 +48,8 @@
 COIN = 100000000 # 1 btc in satoshis
 
 NODE_NETWORK = (1 << 0)
-NODE_GETUTXO = (1 << 1)
-NODE_BLOOM = (1 << 2)
+# NODE_GETUTXO = (1 << 1)
+# NODE_BLOOM = (1 << 2)
 NODE_WITNESS = (1 << 3)
 NODE_UNSUPPORTED_SERVICE_BIT_5 = (1 << 5)
 NODE_UNSUPPORTED_SERVICE_BIT_7 = (1 << 7)
@@ -219,7 +219,7 @@ def ToHex(obj):
 
 # Objects that map to bitcoind objects, which can be serialized/deserialized
 
-class CAddress(object):
+class CAddress():
     def __init__(self):
         self.nServices = 1
         self.pchReserved = b"\x00" * 10 + b"\xff" * 2
@@ -246,7 +246,7 @@ def __repr__(self):
 
 MSG_WITNESS_FLAG = 1<<30
 
-class CInv(object):
+class CInv():
     typemap = {
         0: "Error",
         1: "TX",
@@ -275,7 +275,7 @@ def __repr__(self):
             % (self.typemap[self.type], self.hash)
 
 
-class CBlockLocator(object):
+class CBlockLocator():
     def __init__(self):
         self.nVersion = MY_VERSION
         self.vHave = []
@@ -295,7 +295,7 @@ def __repr__(self):
             % (self.nVersion, repr(self.vHave))
 
 
-class COutPoint(object):
+class COutPoint():
     def __init__(self, hash=0, n=0):
         self.hash = hash
         self.n = n
@@ -314,7 +314,7 @@ def __repr__(self):
         return "COutPoint(hash=%064x n=%i)" % (self.hash, self.n)
 
 
-class CTxIn(object):
+class CTxIn():
     def __init__(self, outpoint=None, scriptSig=b"", nSequence=0):
         if outpoint is None:
             self.prevout = COutPoint()
@@ -342,7 +342,7 @@ def __repr__(self):
                self.nSequence)
 
 
-class CTxOut(object):
+class CTxOut():
     def __init__(self, nValue=0, scriptPubKey=b""):
         self.nValue = nValue
         self.scriptPubKey = scriptPubKey
@@ -363,7 +363,7 @@ def __repr__(self):
                bytes_to_hex_str(self.scriptPubKey))
 
 
-class CScriptWitness(object):
+class CScriptWitness():
     def __init__(self):
         # stack is a vector of strings
         self.stack = []
@@ -378,7 +378,7 @@ def is_null(self):
         return True
 
 
-class CTxInWitness(object):
+class CTxInWitness():
     def __init__(self):
         self.scriptWitness = CScriptWitness()
 
@@ -395,7 +395,7 @@ def is_null(self):
         return self.scriptWitness.is_null()
 
 
-class CTxWitness(object):
+class CTxWitness():
     def __init__(self):
         self.vtxinwit = []
 
@@ -423,7 +423,7 @@ def is_null(self):
         return True
 
 
-class CTransaction(object):
+class CTransaction():
     def __init__(self, tx=None):
         if tx is None:
             self.nVersion = 1
@@ -526,7 +526,7 @@ def __repr__(self):
             % (self.nVersion, repr(self.vin), repr(self.vout), repr(self.wit), self.nLockTime)
 
 
-class CBlockHeader(object):
+class CBlockHeader():
     def __init__(self, header=None):
         if header is None:
             self.set_null()
@@ -666,7 +666,7 @@ def __repr__(self):
                time.ctime(self.nTime), self.nBits, self.nNonce, repr(self.vtx))
 
 
-class CUnsignedAlert(object):
+class CUnsignedAlert():
     def __init__(self):
         self.nVersion = 1
         self.nRelayUntil = 0
@@ -721,7 +721,7 @@ def __repr__(self):
                self.strComment, self.strStatusBar, self.strReserved)
 
 
-class CAlert(object):
+class CAlert():
     def __init__(self):
         self.vchMsg = b""
         self.vchSig = b""
@@ -741,7 +741,7 @@ def __repr__(self):
             % (len(self.vchMsg), len(self.vchSig))
 
 
-class PrefilledTransaction(object):
+class PrefilledTransaction():
     def __init__(self, index=0, tx = None):
         self.index = index
         self.tx = tx
@@ -767,7 +767,7 @@ def __repr__(self):
         return "PrefilledTransaction(index=%d, tx=%s)" % (self.index, repr(self.tx))
 
 # This is what we send on the wire, in a cmpctblock message.
-class P2PHeaderAndShortIDs(object):
+class P2PHeaderAndShortIDs():
     def __init__(self):
         self.header = CBlockHeader()
         self.nonce = 0
@@ -819,7 +819,7 @@ def calculate_shortid(k0, k1, tx_hash):
 
 # This version gets rid of the array lengths, and reinterprets the differential
 # encoding into indices that can be used for lookup.
-class HeaderAndShortIDs(object):
+class HeaderAndShortIDs():
     def __init__(self, p2pheaders_and_shortids = None):
         self.header = CBlockHeader()
         self.nonce = 0
@@ -880,7 +880,7 @@ def __repr__(self):
         return "HeaderAndShortIDs(header=%s, nonce=%d, shortids=%s, prefilledtxn=%s" % (repr(self.header), self.nonce, repr(self.shortids), repr(self.prefilled_txn))
 
 
-class BlockTransactionsRequest(object):
+class BlockTransactionsRequest():
 
     def __init__(self, blockhash=0, indexes = None):
         self.blockhash = blockhash
@@ -920,7 +920,7 @@ def __repr__(self):
         return "BlockTransactionsRequest(hash=%064x indexes=%s)" % (self.blockhash, repr(self.indexes))
 
 
-class BlockTransactions(object):
+class BlockTransactions():
 
     def __init__(self, blockhash=0, transactions = None):
         self.blockhash = blockhash
@@ -944,7 +944,7 @@ def __repr__(self):
 
 
 # Objects that correspond to messages on the wire
-class msg_version(object):
+class msg_version():
     command = b"version"
 
     def __init__(self):
@@ -1012,7 +1012,7 @@ def __repr__(self):
                self.strSubVer, self.nStartingHeight, self.nRelay)
 
 
-class msg_verack(object):
+class msg_verack():
     command = b"verack"
 
     def __init__(self):
@@ -1028,7 +1028,7 @@ def __repr__(self):
         return "msg_verack()"
 
 
-class msg_addr(object):
+class msg_addr():
     command = b"addr"
 
     def __init__(self):
@@ -1044,7 +1044,7 @@ def __repr__(self):
         return "msg_addr(addrs=%s)" % (repr(self.addrs))
 
 
-class msg_alert(object):
+class msg_alert():
     command = b"alert"
 
     def __init__(self):
@@ -1063,7 +1063,7 @@ def __repr__(self):
         return "msg_alert(alert=%s)" % (repr(self.alert), )
 
 
-class msg_inv(object):
+class msg_inv():
     command = b"inv"
 
     def __init__(self, inv=None):
@@ -1082,7 +1082,7 @@ def __repr__(self):
         return "msg_inv(inv=%s)" % (repr(self.inv))
 
 
-class msg_getdata(object):
+class msg_getdata():
     command = b"getdata"
 
     def __init__(self, inv=None):
@@ -1098,7 +1098,7 @@ def __repr__(self):
         return "msg_getdata(inv=%s)" % (repr(self.inv))
 
 
-class msg_getblocks(object):
+class msg_getblocks():
     command = b"getblocks"
 
     def __init__(self):
@@ -1121,7 +1121,7 @@ def __repr__(self):
             % (repr(self.locator), self.hashstop)
 
 
-class msg_tx(object):
+class msg_tx():
     command = b"tx"
 
     def __init__(self, tx=CTransaction()):
@@ -1142,7 +1142,7 @@ def serialize(self):
         return self.tx.serialize_with_witness()
 
 
-class msg_block(object):
+class msg_block():
     command = b"block"
 
     def __init__(self, block=None):
@@ -1162,7 +1162,7 @@ def __repr__(self):
 
 # for cases where a user needs tighter control over what is sent over the wire
 # note that the user must supply the name of the command, and the data
-class msg_generic(object):
+class msg_generic():
     def __init__(self, command, data=None):
         self.command = command
         self.data = data
@@ -1179,7 +1179,7 @@ def serialize(self):
         r = self.block.serialize(with_witness=True)
         return r
 
-class msg_getaddr(object):
+class msg_getaddr():
     command = b"getaddr"
 
     def __init__(self):
@@ -1195,7 +1195,7 @@ def __repr__(self):
         return "msg_getaddr()"
 
 
-class msg_ping_prebip31(object):
+class msg_ping_prebip31():
     command = b"ping"
 
     def __init__(self):
@@ -1211,7 +1211,7 @@ def __repr__(self):
         return "msg_ping() (pre-bip31)"
 
 
-class msg_ping(object):
+class msg_ping():
     command = b"ping"
 
     def __init__(self, nonce=0):
@@ -1229,7 +1229,7 @@ def __repr__(self):
         return "msg_ping(nonce=%08x)" % self.nonce
 
 
-class msg_pong(object):
+class msg_pong():
     command = b"pong"
 
     def __init__(self, nonce=0):
@@ -1247,7 +1247,7 @@ def __repr__(self):
         return "msg_pong(nonce=%08x)" % self.nonce
 
 
-class msg_mempool(object):
+class msg_mempool():
     command = b"mempool"
 
     def __init__(self):
@@ -1262,7 +1262,7 @@ def serialize(self):
     def __repr__(self):
         return "msg_mempool()"
 
-class msg_sendheaders(object):
+class msg_sendheaders():
     command = b"sendheaders"
 
     def __init__(self):
@@ -1282,7 +1282,7 @@ def __repr__(self):
 # number of entries
 # vector of hashes
 # hash_stop (hash of last desired block header, 0 to get as many as possible)
-class msg_getheaders(object):
+class msg_getheaders():
     command = b"getheaders"
 
     def __init__(self):
@@ -1307,11 +1307,11 @@ def __repr__(self):
 
 # headers message has
 # <count> <vector of block headers>
-class msg_headers(object):
+class msg_headers():
     command = b"headers"
 
-    def __init__(self):
-        self.headers = []
+    def __init__(self, headers=None):
+        self.headers = headers if headers is not None else []
 
     def deserialize(self, f):
         # comment in bitcoind indicates these should be deserialized as blocks
@@ -1327,7 +1327,7 @@ def __repr__(self):
         return "msg_headers(headers=%s)" % repr(self.headers)
 
 
-class msg_reject(object):
+class msg_reject():
     command = b"reject"
     REJECT_MALFORMED = 1
 
@@ -1358,24 +1358,7 @@ def __repr__(self):
         return "msg_reject: %s %d %s [%064x]" \
             % (self.message, self.code, self.reason, self.data)
 
-# Helper function
-def wait_until(predicate, *, attempts=float('inf'), timeout=float('inf')):
-    if attempts == float('inf') and timeout == float('inf'):
-        timeout = 60
-    attempt = 0
-    elapsed = 0
-
-    while attempt < attempts and elapsed < timeout:
-        with mininode_lock:
-            if predicate():
-                return True
-        attempt += 1
-        elapsed += 0.05
-        time.sleep(0.05)
-
-    return False
-
-class msg_feefilter(object):
+class msg_feefilter():
     command = b"feefilter"
 
     def __init__(self, feerate=0):
@@ -1392,7 +1375,7 @@ def serialize(self):
     def __repr__(self):
         return "msg_feefilter(feerate=%08x)" % self.feerate
 
-class msg_sendcmpct(object):
+class msg_sendcmpct():
     command = b"sendcmpct"
 
     def __init__(self):
@@ -1412,7 +1395,7 @@ def serialize(self):
     def __repr__(self):
         return "msg_sendcmpct(announce=%s, version=%lu)" % (self.announce, self.version)
 
-class msg_cmpctblock(object):
+class msg_cmpctblock():
     command = b"cmpctblock"
 
     def __init__(self, header_and_shortids = None):
@@ -1430,7 +1413,7 @@ def serialize(self):
     def __repr__(self):
         return "msg_cmpctblock(HeaderAndShortIDs=%s)" % repr(self.header_and_shortids)
 
-class msg_getblocktxn(object):
+class msg_getblocktxn():
     command = b"getblocktxn"
 
     def __init__(self):
@@ -1448,7 +1431,7 @@ def serialize(self):
     def __repr__(self):
         return "msg_getblocktxn(block_txn_request=%s)" % (repr(self.block_txn_request))
 
-class msg_blocktxn(object):
+class msg_blocktxn():
     command = b"blocktxn"
 
     def __init__(self):
@@ -1471,7 +1454,7 @@ def serialize(self):
         r += self.block_transactions.serialize(with_witness=True)
         return r
 
-class NodeConnCB(object):
+class NodeConnCB():
     """Callback and helper functions for P2P connection to a bitcoind node.
 
     Individual testcases should subclass this and override the on_* methods
@@ -1496,9 +1479,6 @@ def __init__(self):
         # before acquiring the global lock and delivering the next message.
         self.deliver_sleep_time = None
 
-        # Remember the services our peer has advertised
-        self.peer_services = None
-
     # Message receiving methods
 
     def deliver(self, conn, message):
@@ -1522,10 +1502,7 @@ def deliver(self, conn, message):
             except:
                 print("ERROR delivering %s (%s)" % (repr(message),
                                                     sys.exc_info()[0]))
-
-    def set_deliver_sleep_time(self, value):
-        with mininode_lock:
-            self.deliver_sleep_time = value
+                raise
 
     def get_deliver_sleep_time(self):
         with mininode_lock:
@@ -1591,21 +1568,21 @@ def add_connection(self, conn):
 
     def wait_for_disconnect(self, timeout=60):
         test_function = lambda: not self.connected
-        assert wait_until(test_function, timeout=timeout)
+        wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     # Message receiving helper methods
 
     def wait_for_block(self, blockhash, timeout=60):
         test_function = lambda: self.last_message.get("block") and self.last_message["block"].block.rehash() == blockhash
-        assert wait_until(test_function, timeout=timeout)
+        wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     def wait_for_getdata(self, timeout=60):
         test_function = lambda: self.last_message.get("getdata")
-        assert wait_until(test_function, timeout=timeout)
+        wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     def wait_for_getheaders(self, timeout=60):
         test_function = lambda: self.last_message.get("getheaders")
-        assert wait_until(test_function, timeout=timeout)
+        wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     def wait_for_inv(self, expected_inv, timeout=60):
         """Waits for an INV message and checks that the first inv object in the message was as expected."""
@@ -1614,11 +1591,11 @@ def wait_for_inv(self, expected_inv, timeout=60):
         test_function = lambda: self.last_message.get("inv") and \
                                 self.last_message["inv"].inv[0].type == expected_inv[0].type and \
                                 self.last_message["inv"].inv[0].hash == expected_inv[0].hash
-        assert wait_until(test_function, timeout=timeout)
+        wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     def wait_for_verack(self, timeout=60):
         test_function = lambda: self.message_count["verack"]
-        assert wait_until(test_function, timeout=timeout)
+        wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     # Message sending helper functions
 
@@ -1636,9 +1613,8 @@ def send_and_ping(self, message):
     def sync_with_ping(self, timeout=60):
         self.send_message(msg_ping(nonce=self.ping_counter))
         test_function = lambda: self.last_message.get("pong") and self.last_message["pong"].nonce == self.ping_counter
-        assert wait_until(test_function, timeout=timeout)
+        wait_until(test_function, timeout=timeout, lock=mininode_lock)
         self.ping_counter += 1
-        return True
 
 # The actual NodeConn class
 # This class provides an interface for a p2p connection to a specified node
@@ -1678,6 +1654,7 @@ def __init__(self, dstaddr, dstport, rpc, callback, net="regtest", services=NODE
         self.dstaddr = dstaddr
         self.dstport = dstport
         self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
         self.sendbuf = b""
         self.recvbuf = b""
         self.ver_send = 209
@@ -1725,13 +1702,10 @@ def handle_close(self):
         self.cb.on_close(self)
 
     def handle_read(self):
-        try:
-            t = self.recv(8192)
-            if len(t) > 0:
-                self.recvbuf += t
-                self.got_data()
-        except:
-            pass
+        t = self.recv(8192)
+        if len(t) > 0:
+            self.recvbuf += t
+            self.got_data()
 
     def readable(self):
         return True
@@ -1797,8 +1771,10 @@ def got_data(self):
                     self.got_message(t)
                 else:
                     logger.warning("Received unknown command from %s:%d: '%s' %s" % (self.dstaddr, self.dstport, command, repr(msg)))
+                    raise ValueError("Unknown command: '%s'" % (command))
         except Exception as e:
             logger.exception('got_data:', repr(e))
+            raise
 
     def send_message(self, message, pushbuf=False):
         if self.state != "connected" and not pushbuf:
@@ -1816,7 +1792,14 @@ def send_message(self, message, pushbuf=False):
             tmsg += h[:4]
         tmsg += data
         with mininode_lock:
-            self.sendbuf += tmsg
+            if (len(self.sendbuf) == 0 and not pushbuf):
+                try:
+                    sent = self.send(tmsg)
+                    self.sendbuf = tmsg[sent:]
+                except BlockingIOError:
+                    self.sendbuf = tmsg
+            else:
+                self.sendbuf += tmsg
             self.last_sent = time.time()
 
     def got_message(self, message):
@@ -1854,6 +1837,7 @@ def run(self):
                     disconnected.append(obj)
             [ obj.handle_close() for obj in disconnected ]
             asyncore.loop(0.1, use_poll=True, map=mininode_socket_map, count=1)
+        logger.debug("Network thread closing")
 
 
 # An exception we can raise if we detect a potential disconnect
diff --git a/test/functional/test_framework/netutil.py b/test/functional/test_framework/netutil.py
index 45d8e22d2..e5d415788 100644
--- a/test/functional/test_framework/netutil.py
+++ b/test/functional/test_framework/netutil.py
@@ -15,17 +15,17 @@
 import os
 from binascii import unhexlify, hexlify
 
-STATE_ESTABLISHED = '01'
-STATE_SYN_SENT  = '02'
-STATE_SYN_RECV = '03'
-STATE_FIN_WAIT1 = '04'
-STATE_FIN_WAIT2 = '05'
-STATE_TIME_WAIT = '06'
-STATE_CLOSE = '07'
-STATE_CLOSE_WAIT = '08'
-STATE_LAST_ACK = '09'
+# STATE_ESTABLISHED = '01'
+# STATE_SYN_SENT  = '02'
+# STATE_SYN_RECV = '03'
+# STATE_FIN_WAIT1 = '04'
+# STATE_FIN_WAIT2 = '05'
+# STATE_TIME_WAIT = '06'
+# STATE_CLOSE = '07'
+# STATE_CLOSE_WAIT = '08'
+# STATE_LAST_ACK = '09'
 STATE_LISTEN = '0A'
-STATE_CLOSING = '0B'
+# STATE_CLOSING = '0B'
 
 def get_socket_inodes(pid):
     '''
diff --git a/test/functional/test_framework/script.py b/test/functional/test_framework/script.py
index 3d9572788..a4c046bd3 100644
--- a/test/functional/test_framework/script.py
+++ b/test/functional/test_framework/script.py
@@ -23,9 +23,7 @@
 
 from .bignum import bn2vch
 
-MAX_SCRIPT_SIZE = 10000
 MAX_SCRIPT_ELEMENT_SIZE = 520
-MAX_SCRIPT_OPCODES = 201
 
 OPCODE_NAMES = {}
 
@@ -242,131 +240,6 @@ def __new__(cls, n):
 
 OP_INVALIDOPCODE = CScriptOp(0xff)
 
-VALID_OPCODES = {
-    OP_1NEGATE,
-    OP_RESERVED,
-    OP_1,
-    OP_2,
-    OP_3,
-    OP_4,
-    OP_5,
-    OP_6,
-    OP_7,
-    OP_8,
-    OP_9,
-    OP_10,
-    OP_11,
-    OP_12,
-    OP_13,
-    OP_14,
-    OP_15,
-    OP_16,
-
-    OP_NOP,
-    OP_VER,
-    OP_IF,
-    OP_NOTIF,
-    OP_VERIF,
-    OP_VERNOTIF,
-    OP_ELSE,
-    OP_ENDIF,
-    OP_VERIFY,
-    OP_RETURN,
-
-    OP_TOALTSTACK,
-    OP_FROMALTSTACK,
-    OP_2DROP,
-    OP_2DUP,
-    OP_3DUP,
-    OP_2OVER,
-    OP_2ROT,
-    OP_2SWAP,
-    OP_IFDUP,
-    OP_DEPTH,
-    OP_DROP,
-    OP_DUP,
-    OP_NIP,
-    OP_OVER,
-    OP_PICK,
-    OP_ROLL,
-    OP_ROT,
-    OP_SWAP,
-    OP_TUCK,
-
-    OP_CAT,
-    OP_SUBSTR,
-    OP_LEFT,
-    OP_RIGHT,
-    OP_SIZE,
-
-    OP_INVERT,
-    OP_AND,
-    OP_OR,
-    OP_XOR,
-    OP_EQUAL,
-    OP_EQUALVERIFY,
-    OP_RESERVED1,
-    OP_RESERVED2,
-
-    OP_1ADD,
-    OP_1SUB,
-    OP_2MUL,
-    OP_2DIV,
-    OP_NEGATE,
-    OP_ABS,
-    OP_NOT,
-    OP_0NOTEQUAL,
-
-    OP_ADD,
-    OP_SUB,
-    OP_MUL,
-    OP_DIV,
-    OP_MOD,
-    OP_LSHIFT,
-    OP_RSHIFT,
-
-    OP_BOOLAND,
-    OP_BOOLOR,
-    OP_NUMEQUAL,
-    OP_NUMEQUALVERIFY,
-    OP_NUMNOTEQUAL,
-    OP_LESSTHAN,
-    OP_GREATERTHAN,
-    OP_LESSTHANOREQUAL,
-    OP_GREATERTHANOREQUAL,
-    OP_MIN,
-    OP_MAX,
-
-    OP_WITHIN,
-
-    OP_RIPEMD160,
-    OP_SHA1,
-    OP_SHA256,
-    OP_HASH160,
-    OP_HASH256,
-    OP_CODESEPARATOR,
-    OP_CHECKSIG,
-    OP_CHECKSIGVERIFY,
-    OP_CHECKMULTISIG,
-    OP_CHECKMULTISIGVERIFY,
-
-    OP_NOP1,
-    OP_CHECKLOCKTIMEVERIFY,
-    OP_CHECKSEQUENCEVERIFY,
-    OP_NOP4,
-    OP_NOP5,
-    OP_NOP6,
-    OP_NOP7,
-    OP_NOP8,
-    OP_NOP9,
-    OP_NOP10,
-
-    OP_SMALLINTEGER,
-    OP_PUBKEYS,
-    OP_PUBKEYHASH,
-    OP_PUBKEY,
-}
-
 OPCODE_NAMES.update({
     OP_0 : 'OP_0',
     OP_PUSHDATA1 : 'OP_PUSHDATA1',
@@ -486,124 +359,6 @@ def __new__(cls, n):
     OP_INVALIDOPCODE : 'OP_INVALIDOPCODE',
 })
 
-OPCODES_BY_NAME = {
-    'OP_0' : OP_0,
-    'OP_PUSHDATA1' : OP_PUSHDATA1,
-    'OP_PUSHDATA2' : OP_PUSHDATA2,
-    'OP_PUSHDATA4' : OP_PUSHDATA4,
-    'OP_1NEGATE' : OP_1NEGATE,
-    'OP_RESERVED' : OP_RESERVED,
-    'OP_1' : OP_1,
-    'OP_2' : OP_2,
-    'OP_3' : OP_3,
-    'OP_4' : OP_4,
-    'OP_5' : OP_5,
-    'OP_6' : OP_6,
-    'OP_7' : OP_7,
-    'OP_8' : OP_8,
-    'OP_9' : OP_9,
-    'OP_10' : OP_10,
-    'OP_11' : OP_11,
-    'OP_12' : OP_12,
-    'OP_13' : OP_13,
-    'OP_14' : OP_14,
-    'OP_15' : OP_15,
-    'OP_16' : OP_16,
-    'OP_NOP' : OP_NOP,
-    'OP_VER' : OP_VER,
-    'OP_IF' : OP_IF,
-    'OP_NOTIF' : OP_NOTIF,
-    'OP_VERIF' : OP_VERIF,
-    'OP_VERNOTIF' : OP_VERNOTIF,
-    'OP_ELSE' : OP_ELSE,
-    'OP_ENDIF' : OP_ENDIF,
-    'OP_VERIFY' : OP_VERIFY,
-    'OP_RETURN' : OP_RETURN,
-    'OP_TOALTSTACK' : OP_TOALTSTACK,
-    'OP_FROMALTSTACK' : OP_FROMALTSTACK,
-    'OP_2DROP' : OP_2DROP,
-    'OP_2DUP' : OP_2DUP,
-    'OP_3DUP' : OP_3DUP,
-    'OP_2OVER' : OP_2OVER,
-    'OP_2ROT' : OP_2ROT,
-    'OP_2SWAP' : OP_2SWAP,
-    'OP_IFDUP' : OP_IFDUP,
-    'OP_DEPTH' : OP_DEPTH,
-    'OP_DROP' : OP_DROP,
-    'OP_DUP' : OP_DUP,
-    'OP_NIP' : OP_NIP,
-    'OP_OVER' : OP_OVER,
-    'OP_PICK' : OP_PICK,
-    'OP_ROLL' : OP_ROLL,
-    'OP_ROT' : OP_ROT,
-    'OP_SWAP' : OP_SWAP,
-    'OP_TUCK' : OP_TUCK,
-    'OP_CAT' : OP_CAT,
-    'OP_SUBSTR' : OP_SUBSTR,
-    'OP_LEFT' : OP_LEFT,
-    'OP_RIGHT' : OP_RIGHT,
-    'OP_SIZE' : OP_SIZE,
-    'OP_INVERT' : OP_INVERT,
-    'OP_AND' : OP_AND,
-    'OP_OR' : OP_OR,
-    'OP_XOR' : OP_XOR,
-    'OP_EQUAL' : OP_EQUAL,
-    'OP_EQUALVERIFY' : OP_EQUALVERIFY,
-    'OP_RESERVED1' : OP_RESERVED1,
-    'OP_RESERVED2' : OP_RESERVED2,
-    'OP_1ADD' : OP_1ADD,
-    'OP_1SUB' : OP_1SUB,
-    'OP_2MUL' : OP_2MUL,
-    'OP_2DIV' : OP_2DIV,
-    'OP_NEGATE' : OP_NEGATE,
-    'OP_ABS' : OP_ABS,
-    'OP_NOT' : OP_NOT,
-    'OP_0NOTEQUAL' : OP_0NOTEQUAL,
-    'OP_ADD' : OP_ADD,
-    'OP_SUB' : OP_SUB,
-    'OP_MUL' : OP_MUL,
-    'OP_DIV' : OP_DIV,
-    'OP_MOD' : OP_MOD,
-    'OP_LSHIFT' : OP_LSHIFT,
-    'OP_RSHIFT' : OP_RSHIFT,
-    'OP_BOOLAND' : OP_BOOLAND,
-    'OP_BOOLOR' : OP_BOOLOR,
-    'OP_NUMEQUAL' : OP_NUMEQUAL,
-    'OP_NUMEQUALVERIFY' : OP_NUMEQUALVERIFY,
-    'OP_NUMNOTEQUAL' : OP_NUMNOTEQUAL,
-    'OP_LESSTHAN' : OP_LESSTHAN,
-    'OP_GREATERTHAN' : OP_GREATERTHAN,
-    'OP_LESSTHANOREQUAL' : OP_LESSTHANOREQUAL,
-    'OP_GREATERTHANOREQUAL' : OP_GREATERTHANOREQUAL,
-    'OP_MIN' : OP_MIN,
-    'OP_MAX' : OP_MAX,
-    'OP_WITHIN' : OP_WITHIN,
-    'OP_RIPEMD160' : OP_RIPEMD160,
-    'OP_SHA1' : OP_SHA1,
-    'OP_SHA256' : OP_SHA256,
-    'OP_HASH160' : OP_HASH160,
-    'OP_HASH256' : OP_HASH256,
-    'OP_CODESEPARATOR' : OP_CODESEPARATOR,
-    'OP_CHECKSIG' : OP_CHECKSIG,
-    'OP_CHECKSIGVERIFY' : OP_CHECKSIGVERIFY,
-    'OP_CHECKMULTISIG' : OP_CHECKMULTISIG,
-    'OP_CHECKMULTISIGVERIFY' : OP_CHECKMULTISIGVERIFY,
-    'OP_NOP1' : OP_NOP1,
-    'OP_CHECKLOCKTIMEVERIFY' : OP_CHECKLOCKTIMEVERIFY,
-    'OP_CHECKSEQUENCEVERIFY' : OP_CHECKSEQUENCEVERIFY,
-    'OP_NOP4' : OP_NOP4,
-    'OP_NOP5' : OP_NOP5,
-    'OP_NOP6' : OP_NOP6,
-    'OP_NOP7' : OP_NOP7,
-    'OP_NOP8' : OP_NOP8,
-    'OP_NOP9' : OP_NOP9,
-    'OP_NOP10' : OP_NOP10,
-    'OP_SMALLINTEGER' : OP_SMALLINTEGER,
-    'OP_PUBKEYS' : OP_PUBKEYS,
-    'OP_PUBKEYHASH' : OP_PUBKEYHASH,
-    'OP_PUBKEY' : OP_PUBKEY,
-}
-
 class CScriptInvalidError(Exception):
     """Base class for CScript exceptions"""
     pass
@@ -615,7 +370,7 @@ def __init__(self, msg, data):
         super(CScriptTruncatedPushDataError, self).__init__(msg)
 
 # This is used, eg, for blockchain heights in coinbase scripts (bip34)
-class CScriptNum(object):
+class CScriptNum():
     def __init__(self, d=0):
         self.value = d
 
diff --git a/test/functional/test_framework/segwit_addr.py b/test/functional/test_framework/segwit_addr.py
new file mode 100644
index 000000000..02368e938
--- /dev/null
+++ b/test/functional/test_framework/segwit_addr.py
@@ -0,0 +1,107 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 Pieter Wuille
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Reference implementation for Bech32 and segwit addresses."""
+
+
+CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
+
+
+def bech32_polymod(values):
+    """Internal function that computes the Bech32 checksum."""
+    generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
+    chk = 1
+    for value in values:
+        top = chk >> 25
+        chk = (chk & 0x1ffffff) << 5 ^ value
+        for i in range(5):
+            chk ^= generator[i] if ((top >> i) & 1) else 0
+    return chk
+
+
+def bech32_hrp_expand(hrp):
+    """Expand the HRP into values for checksum computation."""
+    return [ord(x) >> 5 for x in hrp] + [0] + [ord(x) & 31 for x in hrp]
+
+
+def bech32_verify_checksum(hrp, data):
+    """Verify a checksum given HRP and converted data characters."""
+    return bech32_polymod(bech32_hrp_expand(hrp) + data) == 1
+
+
+def bech32_create_checksum(hrp, data):
+    """Compute the checksum values given HRP and data."""
+    values = bech32_hrp_expand(hrp) + data
+    polymod = bech32_polymod(values + [0, 0, 0, 0, 0, 0]) ^ 1
+    return [(polymod >> 5 * (5 - i)) & 31 for i in range(6)]
+
+
+def bech32_encode(hrp, data):
+    """Compute a Bech32 string given HRP and data values."""
+    combined = data + bech32_create_checksum(hrp, data)
+    return hrp + '1' + ''.join([CHARSET[d] for d in combined])
+
+
+def bech32_decode(bech):
+    """Validate a Bech32 string, and determine HRP and data."""
+    if ((any(ord(x) < 33 or ord(x) > 126 for x in bech)) or
+            (bech.lower() != bech and bech.upper() != bech)):
+        return (None, None)
+    bech = bech.lower()
+    pos = bech.rfind('1')
+    if pos < 1 or pos + 7 > len(bech) or len(bech) > 90:
+        return (None, None)
+    if not all(x in CHARSET for x in bech[pos+1:]):
+        return (None, None)
+    hrp = bech[:pos]
+    data = [CHARSET.find(x) for x in bech[pos+1:]]
+    if not bech32_verify_checksum(hrp, data):
+        return (None, None)
+    return (hrp, data[:-6])
+
+
+def convertbits(data, frombits, tobits, pad=True):
+    """General power-of-2 base conversion."""
+    acc = 0
+    bits = 0
+    ret = []
+    maxv = (1 << tobits) - 1
+    max_acc = (1 << (frombits + tobits - 1)) - 1
+    for value in data:
+        if value < 0 or (value >> frombits):
+            return None
+        acc = ((acc << frombits) | value) & max_acc
+        bits += frombits
+        while bits >= tobits:
+            bits -= tobits
+            ret.append((acc >> bits) & maxv)
+    if pad:
+        if bits:
+            ret.append((acc << (tobits - bits)) & maxv)
+    elif bits >= frombits or ((acc << (tobits - bits)) & maxv):
+        return None
+    return ret
+
+
+def decode(hrp, addr):
+    """Decode a segwit address."""
+    hrpgot, data = bech32_decode(addr)
+    if hrpgot != hrp:
+        return (None, None)
+    decoded = convertbits(data[1:], 5, 8, False)
+    if decoded is None or len(decoded) < 2 or len(decoded) > 40:
+        return (None, None)
+    if data[0] > 16:
+        return (None, None)
+    if data[0] == 0 and len(decoded) != 20 and len(decoded) != 32:
+        return (None, None)
+    return (data[0], decoded)
+
+
+def encode(hrp, witver, witprog):
+    """Encode a segwit address."""
+    ret = bech32_encode(hrp, [witver] + convertbits(witprog, 8, 5))
+    if decode(hrp, ret) == (None, None):
+        return None
+    return ret
diff --git a/test/functional/test_framework/socks5.py b/test/functional/test_framework/socks5.py
index a08b03ed2..7b40c47fb 100644
--- a/test/functional/test_framework/socks5.py
+++ b/test/functional/test_framework/socks5.py
@@ -31,7 +31,7 @@ def recvall(s, n):
     return rv
 
 ### Implementation classes
-class Socks5Configuration(object):
+class Socks5Configuration():
     """Proxy configuration."""
     def __init__(self):
         self.addr = None # Bind address (must be set)
@@ -39,7 +39,7 @@ def __init__(self):
         self.unauth = False  # Support unauthenticated
         self.auth = False  # Support authentication
 
-class Socks5Command(object):
+class Socks5Command():
     """Information about an incoming socks5 command."""
     def __init__(self, cmd, atyp, addr, port, username, password):
         self.cmd = cmd # Command (one of Command.*)
@@ -51,7 +51,7 @@ def __init__(self, cmd, atyp, addr, port, username, password):
     def __repr__(self):
         return 'Socks5Command(%s,%s,%s,%s,%s,%s)' % (self.cmd, self.atyp, self.addr, self.port, self.username, self.password)
 
-class Socks5Connection(object):
+class Socks5Connection():
     def __init__(self, serv, conn, peer):
         self.serv = serv
         self.conn = conn
@@ -91,7 +91,7 @@ def handle(self):
                 self.conn.sendall(bytearray([0x01, 0x00]))
 
             # Read connect request
-            (ver,cmd,rsv,atyp) = recvall(self.conn, 4)
+            ver, cmd, _, atyp = recvall(self.conn, 4)
             if ver != 0x05:
                 raise IOError('Invalid socks version %i in connect request' % ver)
             if cmd != Command.CONNECT:
@@ -122,7 +122,7 @@ def handle(self):
         finally:
             self.conn.close()
 
-class Socks5Server(object):
+class Socks5Server():
     def __init__(self, conf):
         self.conf = conf
         self.s = socket.socket(conf.af)
diff --git a/test/functional/test_framework/test_framework.py b/test/functional/test_framework/test_framework.py
index 8d698a732..8df50474f 100755
--- a/test/functional/test_framework/test_framework.py
+++ b/test/functional/test_framework/test_framework.py
@@ -5,14 +5,12 @@
 """Base class for RPC testing."""
 
 from collections import deque
-import errno
 from enum import Enum
-import http.client
 import logging
 import optparse
 import os
+import pdb
 import shutil
-import subprocess
 import sys
 import tempfile
 import time
@@ -20,6 +18,7 @@
 
 from .authproxy import JSONRPCException
 from . import coverage
+from .test_node import TestNode
 from .util import (
     MAX_NODES,
     PortSeed,
@@ -27,12 +26,9 @@
     check_json_precision,
     connect_nodes_bi,
     disconnect_nodes,
-    get_rpc_proxy,
     initialize_datadir,
-    get_datadir_path,
     log_filename,
     p2p_port,
-    rpc_url,
     set_node_times,
     sync_blocks,
     sync_mempools,
@@ -47,63 +43,33 @@ class TestStatus(Enum):
 TEST_EXIT_FAILED = 1
 TEST_EXIT_SKIPPED = 77
 
-BITCOIND_PROC_WAIT_TIMEOUT = 60
-
-class BitcoinTestFramework(object):
+class BitcoinTestFramework():
     """Base class for a bitcoin test script.
 
-    Individual bitcoin test scripts should subclass this class and override the following methods:
+    Individual bitcoin test scripts should subclass this class and override the set_test_params() and run_test() methods.
+
+    Individual tests can also override the following methods to customize the test setup:
 
-    - __init__()
     - add_options()
     - setup_chain()
     - setup_network()
-    - run_test()
+    - setup_nodes()
 
-    The main() method should not be overridden.
+    The __init__() and main() methods should not be overridden.
 
     This class also contains various public and private helper methods."""
 
-    # Methods to override in subclass test scripts.
     def __init__(self):
-        self.num_nodes = 4
+        """Sets test framework defaults. Do not override this method. Instead, override the set_test_params() method"""
         self.setup_clean_chain = False
         self.nodes = []
-        self.bitcoind_processes = {}
         self.mocktime = 0
+        self.set_test_params()
 
-    def add_options(self, parser):
-        pass
-
-    def setup_chain(self):
-        self.log.info("Initializing test directory " + self.options.tmpdir)
-        if self.setup_clean_chain:
-            self._initialize_chain_clean(self.options.tmpdir, self.num_nodes)
-        else:
-            self._initialize_chain(self.options.tmpdir, self.num_nodes, self.options.cachedir)
-
-    def setup_network(self):
-        self.setup_nodes()
-
-        # Connect the nodes as a "chain".  This allows us
-        # to split the network between nodes 1 and 2 to get
-        # two halves that can work on competing chains.
-        for i in range(self.num_nodes - 1):
-            connect_nodes_bi(self.nodes, i, i + 1)
-        self.sync_all()
-
-    def setup_nodes(self):
-        extra_args = None
-        if hasattr(self, "extra_args"):
-            extra_args = self.extra_args
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, extra_args)
-
-    def run_test(self):
-        raise NotImplementedError
-
-    # Main function. This should not be overridden by the subclass test scripts.
+        assert hasattr(self, "num_nodes"), "Test must set self.num_nodes in set_test_params()"
 
     def main(self):
+        """Main function. This should not be overridden by the subclass test scripts."""
 
         parser = optparse.OptionParser(usage="%prog [options]")
         parser.add_option("--nocleanup", dest="nocleanup", default=False, action="store_true",
@@ -125,6 +91,8 @@ def main(self):
                           help="Write tested RPC commands into this directory")
         parser.add_option("--configfile", dest="configfile",
                           help="Location of the test framework config file")
+        parser.add_option("--pdbonfailure", dest="pdbonfailure", default=False, action="store_true",
+                          help="Attach a python debugger if test fails")
         self.add_options(parser)
         (self.options, self.args) = parser.parse_args()
 
@@ -134,8 +102,11 @@ def main(self):
 
         check_json_precision()
 
+        self.options.cachedir = os.path.abspath(self.options.cachedir)
+
         # Set up temp directory and start logging
         if self.options.tmpdir:
+            self.options.tmpdir = os.path.abspath(self.options.tmpdir)
             os.makedirs(self.options.tmpdir, exist_ok=False)
         else:
             self.options.tmpdir = tempfile.mkdtemp(prefix="test")
@@ -162,6 +133,10 @@ def main(self):
         except KeyboardInterrupt as e:
             self.log.warning("Exiting after keyboard interrupt")
 
+        if success == TestStatus.FAILED and self.options.pdbonfailure:
+            print("Testcase failed. Attaching python debugger. Enter ? for help")
+            pdb.set_trace()
+
         if not self.options.noshutdown:
             self.log.info("Stopping nodes")
             if self.nodes:
@@ -201,77 +176,120 @@ def main(self):
             logging.shutdown()
             sys.exit(TEST_EXIT_FAILED)
 
-    # Public helper methods. These can be accessed by the subclass test scripts.
+    # Methods to override in subclass test scripts.
+    def set_test_params(self):
+        """Tests must this method to change default values for number of nodes, topology, etc"""
+        raise NotImplementedError
 
-    def start_node(self, i, dirname, extra_args=None, rpchost=None, timewait=None, binary=None, stderr=None):
-        """Start a bitcoind and return RPC connection to it"""
+    def add_options(self, parser):
+        """Override this method to add command-line options to the test"""
+        pass
 
-        datadir = os.path.join(dirname, "node" + str(i))
-        if binary is None:
-            binary = os.getenv("BITCOIND", "bitcoind")
-        args = [binary, "-datadir=" + datadir, "-server", "-keypool=1", "-discover=0", "-rest", "-logtimemicros", "-debug", "-debugexclude=libevent", "-debugexclude=leveldb", "-mocktime=" + str(self.mocktime), "-uacomment=testnode%d" % i]
-        if extra_args is not None:
-            args.extend(extra_args)
-        self.bitcoind_processes[i] = subprocess.Popen(args, stderr=stderr)
-        self.log.debug("initialize_chain: bitcoind started, waiting for RPC to come up")
-        self._wait_for_bitcoind_start(self.bitcoind_processes[i], datadir, i, rpchost)
-        self.log.debug("initialize_chain: RPC successfully started")
-        proxy = get_rpc_proxy(rpc_url(datadir, i, rpchost), i, timeout=timewait)
+    def setup_chain(self):
+        """Override this method to customize blockchain setup"""
+        self.log.info("Initializing test directory " + self.options.tmpdir)
+        if self.setup_clean_chain:
+            self._initialize_chain_clean()
+        else:
+            self._initialize_chain()
 
-        if self.options.coveragedir:
-            coverage.write_all_rpc_commands(self.options.coveragedir, proxy)
+    def setup_network(self):
+        """Override this method to customize test network topology"""
+        self.setup_nodes()
+
+        # Connect the nodes as a "chain".  This allows us
+        # to split the network between nodes 1 and 2 to get
+        # two halves that can work on competing chains.
+        for i in range(self.num_nodes - 1):
+            connect_nodes_bi(self.nodes, i, i + 1)
+        self.sync_all()
+
+    def setup_nodes(self):
+        """Override this method to customize test node setup"""
+        extra_args = None
+        if hasattr(self, "extra_args"):
+            extra_args = self.extra_args
+        self.add_nodes(self.num_nodes, extra_args)
+        self.start_nodes()
+
+    def run_test(self):
+        """Tests must override this method to define test logic"""
+        raise NotImplementedError
 
-        return proxy
+    # Public helper methods. These can be accessed by the subclass test scripts.
 
-    def start_nodes(self, num_nodes, dirname, extra_args=None, rpchost=None, timewait=None, binary=None):
-        """Start multiple bitcoinds, return RPC connections to them"""
+    def add_nodes(self, num_nodes, extra_args=None, rpchost=None, timewait=None, binary=None):
+        """Instantiate TestNode objects"""
 
         if extra_args is None:
-            extra_args = [None] * num_nodes
+            extra_args = [[]] * num_nodes
         if binary is None:
             binary = [None] * num_nodes
         assert_equal(len(extra_args), num_nodes)
         assert_equal(len(binary), num_nodes)
-        rpcs = []
+        for i in range(num_nodes):
+            self.nodes.append(TestNode(i, self.options.tmpdir, extra_args[i], rpchost, timewait=timewait, binary=binary[i], stderr=None, mocktime=self.mocktime, coverage_dir=self.options.coveragedir))
+
+    def start_node(self, i, extra_args=None, stderr=None):
+        """Start a bitcoind"""
+
+        node = self.nodes[i]
+
+        node.start(extra_args, stderr)
+        node.wait_for_rpc_connection()
+
+        if self.options.coveragedir is not None:
+            coverage.write_all_rpc_commands(self.options.coveragedir, node.rpc)
+
+    def start_nodes(self, extra_args=None):
+        """Start multiple bitcoinds"""
+
+        if extra_args is None:
+            extra_args = [None] * self.num_nodes
+        assert_equal(len(extra_args), self.num_nodes)
         try:
-            for i in range(num_nodes):
-                rpcs.append(self.start_node(i, dirname, extra_args[i], rpchost, timewait=timewait, binary=binary[i]))
+            for i, node in enumerate(self.nodes):
+                node.start(extra_args[i])
+            for node in self.nodes:
+                node.wait_for_rpc_connection()
         except:
             # If one node failed to start, stop the others
-            # TODO: abusing self.nodes in this way is a little hacky.
-            # Eventually we should do a better job of tracking nodes
-            self.nodes.extend(rpcs)
             self.stop_nodes()
-            self.nodes = []
             raise
-        return rpcs
+
+        if self.options.coveragedir is not None:
+            for node in self.nodes:
+                coverage.write_all_rpc_commands(self.options.coveragedir, node.rpc)
 
     def stop_node(self, i):
         """Stop a bitcoind test node"""
-
-        self.log.debug("Stopping node %d" % i)
-        try:
-            self.nodes[i].stop()
-        except http.client.CannotSendRequest as e:
-            self.log.exception("Unable to stop node")
-        return_code = self.bitcoind_processes[i].wait(timeout=BITCOIND_PROC_WAIT_TIMEOUT)
-        del self.bitcoind_processes[i]
-        assert_equal(return_code, 0)
+        self.nodes[i].stop_node()
+        self.nodes[i].wait_until_stopped()
 
     def stop_nodes(self):
         """Stop multiple bitcoind test nodes"""
+        for node in self.nodes:
+            # Issue RPC to stop nodes
+            node.stop_node()
 
-        for i in range(len(self.nodes)):
-            self.stop_node(i)
-        assert not self.bitcoind_processes.values()  # All connections must be gone now
+        for node in self.nodes:
+            # Wait for nodes to stop
+            node.wait_until_stopped()
 
-    def assert_start_raises_init_error(self, i, dirname, extra_args=None, expected_msg=None):
+    def restart_node(self, i, extra_args=None):
+        """Stop and start a test node"""
+        self.stop_node(i)
+        self.start_node(i, extra_args)
+
+    def assert_start_raises_init_error(self, i, extra_args=None, expected_msg=None):
         with tempfile.SpooledTemporaryFile(max_size=2**16) as log_stderr:
             try:
-                self.start_node(i, dirname, extra_args, stderr=log_stderr)
+                self.start_node(i, extra_args, stderr=log_stderr)
                 self.stop_node(i)
             except Exception as e:
                 assert 'bitcoind exited' in str(e)  # node must have shutdown
+                self.nodes[i].running = False
+                self.nodes[i].process = None
                 if expected_msg is not None:
                     log_stderr.seek(0)
                     stderr = log_stderr.read().decode('utf-8')
@@ -285,7 +303,7 @@ def assert_start_raises_init_error(self, i, dirname, extra_args=None, expected_m
                 raise AssertionError(assert_msg)
 
     def wait_for_node_exit(self, i, timeout):
-        self.bitcoind_processes[i].wait(timeout)
+        self.nodes[i].process.wait(timeout)
 
     def split_network(self):
         """
@@ -355,16 +373,16 @@ def _start_logging(self):
             rpc_handler.setLevel(logging.DEBUG)
             rpc_logger.addHandler(rpc_handler)
 
-    def _initialize_chain(self, test_dir, num_nodes, cachedir):
+    def _initialize_chain(self):
         """Initialize a pre-mined blockchain for use by the test.
 
         Create a cache of a 200-block-long chain (with wallet) for MAX_NODES
         Afterward, create num_nodes copies from the cache."""
 
-        assert num_nodes <= MAX_NODES
+        assert self.num_nodes <= MAX_NODES
         create_cache = False
         for i in range(MAX_NODES):
-            if not os.path.isdir(os.path.join(cachedir, 'node' + str(i))):
+            if not os.path.isdir(os.path.join(self.options.cachedir, 'node' + str(i))):
                 create_cache = True
                 break
 
@@ -373,27 +391,22 @@ def _initialize_chain(self, test_dir, num_nodes, cachedir):
 
             # find and delete old cache directories if any exist
             for i in range(MAX_NODES):
-                if os.path.isdir(os.path.join(cachedir, "node" + str(i))):
-                    shutil.rmtree(os.path.join(cachedir, "node" + str(i)))
+                if os.path.isdir(os.path.join(self.options.cachedir, "node" + str(i))):
+                    shutil.rmtree(os.path.join(self.options.cachedir, "node" + str(i)))
 
             # Create cache directories, run bitcoinds:
             for i in range(MAX_NODES):
-                datadir = initialize_datadir(cachedir, i)
+                datadir = initialize_datadir(self.options.cachedir, i)
                 args = [os.getenv("BITCOIND", "bitcoind"), "-server", "-keypool=1", "-datadir=" + datadir, "-discover=0"]
                 if i > 0:
                     args.append("-connect=127.0.0.1:" + str(p2p_port(0)))
-                self.bitcoind_processes[i] = subprocess.Popen(args)
-                self.log.debug("initialize_chain: bitcoind started, waiting for RPC to come up")
-                self._wait_for_bitcoind_start(self.bitcoind_processes[i], datadir, i)
-                self.log.debug("initialize_chain: RPC successfully started")
+                self.nodes.append(TestNode(i, self.options.cachedir, extra_args=[], rpchost=None, timewait=None, binary=None, stderr=None, mocktime=self.mocktime, coverage_dir=None))
+                self.nodes[i].args = args
+                self.start_node(i)
 
-            self.nodes = []
-            for i in range(MAX_NODES):
-                try:
-                    self.nodes.append(get_rpc_proxy(rpc_url(get_datadir_path(cachedir, i), i), i))
-                except:
-                    self.log.exception("Error connecting to node %d" % i)
-                    sys.exit(1)
+            # Wait for RPC connections to be ready
+            for node in self.nodes:
+                node.wait_for_rpc_connection()
 
             # Create a 200-block-long chain; each of the 4 first nodes
             # gets 25 mature blocks and 25 immature.
@@ -418,48 +431,24 @@ def _initialize_chain(self, test_dir, num_nodes, cachedir):
             self.nodes = []
             self.disable_mocktime()
             for i in range(MAX_NODES):
-                os.remove(log_filename(cachedir, i, "debug.log"))
-                os.remove(log_filename(cachedir, i, "db.log"))
-                os.remove(log_filename(cachedir, i, "peers.dat"))
-                os.remove(log_filename(cachedir, i, "fee_estimates.dat"))
-
-        for i in range(num_nodes):
-            from_dir = os.path.join(cachedir, "node" + str(i))
-            to_dir = os.path.join(test_dir, "node" + str(i))
+                os.remove(log_filename(self.options.cachedir, i, "debug.log"))
+                os.remove(log_filename(self.options.cachedir, i, "db.log"))
+                os.remove(log_filename(self.options.cachedir, i, "peers.dat"))
+                os.remove(log_filename(self.options.cachedir, i, "fee_estimates.dat"))
+
+        for i in range(self.num_nodes):
+            from_dir = os.path.join(self.options.cachedir, "node" + str(i))
+            to_dir = os.path.join(self.options.tmpdir, "node" + str(i))
             shutil.copytree(from_dir, to_dir)
-            initialize_datadir(test_dir, i)  # Overwrite port/rpcport in bitcoin.conf
+            initialize_datadir(self.options.tmpdir, i)  # Overwrite port/rpcport in bitcoin.conf
 
-    def _initialize_chain_clean(self, test_dir, num_nodes):
+    def _initialize_chain_clean(self):
         """Initialize empty blockchain for use by the test.
 
         Create an empty blockchain and num_nodes wallets.
         Useful if a test case wants complete control over initialization."""
-        for i in range(num_nodes):
-            initialize_datadir(test_dir, i)
-
-    def _wait_for_bitcoind_start(self, process, datadir, i, rpchost=None):
-        """Wait for bitcoind to start.
-
-        This means that RPC is accessible and fully initialized.
-        Raise an exception if bitcoind exits during initialization."""
-        while True:
-            if process.poll() is not None:
-                raise Exception('bitcoind exited with status %i during initialization' % process.returncode)
-            try:
-                # Check if .cookie file to be created
-                rpc = get_rpc_proxy(rpc_url(datadir, i, rpchost), i, coveragedir=self.options.coveragedir)
-                rpc.getblockcount()
-                break  # break out of loop on success
-            except IOError as e:
-                if e.errno != errno.ECONNREFUSED:  # Port not yet open?
-                    raise  # unknown IO error
-            except JSONRPCException as e:  # Initialization phase
-                if e.error['code'] != -28:  # RPC in warmup?
-                    raise  # unknown JSON RPC exception
-            except ValueError as e:  # cookie file not found and no rpcuser or rpcassword. bitcoind still starting
-                if "No RPC credentials" not in str(e):
-                    raise
-            time.sleep(0.25)
+        for i in range(self.num_nodes):
+            initialize_datadir(self.options.tmpdir, i)
 
 class ComparisonTestFramework(BitcoinTestFramework):
     """Test framework for doing p2p comparison testing
@@ -469,8 +458,7 @@ class ComparisonTestFramework(BitcoinTestFramework):
     - 2 binaries: 1 test binary, 1 ref binary
     - n>2 binaries: 1 test binary, n-1 ref binaries"""
 
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 2
         self.setup_clean_chain = True
 
@@ -483,13 +471,13 @@ def add_options(self, parser):
                           help="bitcoind binary to use for reference nodes (if any)")
 
     def setup_network(self):
-        extra_args = [['-whitelist=127.0.0.1']]*self.num_nodes
+        extra_args = [['-whitelist=127.0.0.1']] * self.num_nodes
         if hasattr(self, "extra_args"):
             extra_args = self.extra_args
-        self.nodes = self.start_nodes(
-            self.num_nodes, self.options.tmpdir, extra_args,
-            binary=[self.options.testbinary] +
-            [self.options.refbinary] * (self.num_nodes - 1))
+        self.add_nodes(self.num_nodes, extra_args,
+                       binary=[self.options.testbinary] +
+                       [self.options.refbinary] * (self.num_nodes - 1))
+        self.start_nodes()
 
 class SkipTest(Exception):
     """This exception is raised to skip a test"""
diff --git a/test/functional/test_framework/test_node.py b/test/functional/test_framework/test_node.py
new file mode 100755
index 000000000..12dab57a0
--- /dev/null
+++ b/test/functional/test_framework/test_node.py
@@ -0,0 +1,190 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Class for bitcoind node under test"""
+
+import decimal
+import errno
+import http.client
+import json
+import logging
+import os
+import subprocess
+import time
+
+from .util import (
+    assert_equal,
+    get_rpc_proxy,
+    rpc_url,
+    wait_until,
+)
+from .authproxy import JSONRPCException
+
+BITCOIND_PROC_WAIT_TIMEOUT = 60
+
+class TestNode():
+    """A class for representing a bitcoind node under test.
+
+    This class contains:
+
+    - state about the node (whether it's running, etc)
+    - a Python subprocess.Popen object representing the running process
+    - an RPC connection to the node
+
+    To make things easier for the test writer, a bit of magic is happening under the covers.
+    Any unrecognised messages will be dispatched to the RPC connection."""
+
+    def __init__(self, i, dirname, extra_args, rpchost, timewait, binary, stderr, mocktime, coverage_dir):
+        self.index = i
+        self.datadir = os.path.join(dirname, "node" + str(i))
+        self.rpchost = rpchost
+        if timewait:
+            self.rpc_timeout = timewait
+        else:
+            # Wait for up to 60 seconds for the RPC server to respond
+            self.rpc_timeout = 60
+        if binary is None:
+            self.binary = os.getenv("BITCOIND", "bitcoind")
+        else:
+            self.binary = binary
+        self.stderr = stderr
+        self.coverage_dir = coverage_dir
+        # Most callers will just need to add extra args to the standard list below. For those callers that need more flexibity, they can just set the args property directly.
+        self.extra_args = extra_args
+        self.args = [self.binary, "-datadir=" + self.datadir, "-server", "-keypool=1", "-discover=0", "-rest", "-logtimemicros", "-debug", "-debugexclude=libevent", "-debugexclude=leveldb", "-mocktime=" + str(mocktime), "-uacomment=testnode%d" % i]
+
+        self.cli = TestNodeCLI(os.getenv("BITCOINCLI", "bitcoin-cli"), self.datadir)
+
+        self.running = False
+        self.process = None
+        self.rpc_connected = False
+        self.rpc = None
+        self.url = None
+        self.log = logging.getLogger('TestFramework.node%d' % i)
+
+    def __getattr__(self, *args, **kwargs):
+        """Dispatches any unrecognised messages to the RPC connection."""
+        assert self.rpc_connected and self.rpc is not None, "Error: no RPC connection"
+        return self.rpc.__getattr__(*args, **kwargs)
+
+    def start(self, extra_args=None, stderr=None):
+        """Start the node."""
+        if extra_args is None:
+            extra_args = self.extra_args
+        if stderr is None:
+            stderr = self.stderr
+        self.process = subprocess.Popen(self.args + extra_args, stderr=stderr)
+        self.running = True
+        self.log.debug("bitcoind started, waiting for RPC to come up")
+
+    def wait_for_rpc_connection(self):
+        """Sets up an RPC connection to the bitcoind process. Returns False if unable to connect."""
+        # Poll at a rate of four times per second
+        poll_per_s = 4
+        for _ in range(poll_per_s * self.rpc_timeout):
+            assert self.process.poll() is None, "bitcoind exited with status %i during initialization" % self.process.returncode
+            try:
+                self.rpc = get_rpc_proxy(rpc_url(self.datadir, self.index, self.rpchost), self.index, timeout=self.rpc_timeout, coveragedir=self.coverage_dir)
+                self.rpc.getblockcount()
+                # If the call to getblockcount() succeeds then the RPC connection is up
+                self.rpc_connected = True
+                self.url = self.rpc.url
+                self.log.debug("RPC successfully started")
+                return
+            except IOError as e:
+                if e.errno != errno.ECONNREFUSED:  # Port not yet open?
+                    raise  # unknown IO error
+            except JSONRPCException as e:  # Initialization phase
+                if e.error['code'] != -28:  # RPC in warmup?
+                    raise  # unknown JSON RPC exception
+            except ValueError as e:  # cookie file not found and no rpcuser or rpcassword. bitcoind still starting
+                if "No RPC credentials" not in str(e):
+                    raise
+            time.sleep(1.0 / poll_per_s)
+        raise AssertionError("Unable to connect to bitcoind")
+
+    def get_wallet_rpc(self, wallet_name):
+        assert self.rpc_connected
+        assert self.rpc
+        wallet_path = "wallet/%s" % wallet_name
+        return self.rpc / wallet_path
+
+    def stop_node(self):
+        """Stop the node."""
+        if not self.running:
+            return
+        self.log.debug("Stopping node")
+        try:
+            self.stop()
+        except http.client.CannotSendRequest:
+            self.log.exception("Unable to stop node.")
+
+    def is_node_stopped(self):
+        """Checks whether the node has stopped.
+
+        Returns True if the node has stopped. False otherwise.
+        This method is responsible for freeing resources (self.process)."""
+        if not self.running:
+            return True
+        return_code = self.process.poll()
+        if return_code is None:
+            return False
+
+        # process has stopped. Assert that it didn't return an error code.
+        assert_equal(return_code, 0)
+        self.running = False
+        self.process = None
+        self.rpc_connected = False
+        self.rpc = None
+        self.log.debug("Node stopped")
+        return True
+
+    def wait_until_stopped(self, timeout=BITCOIND_PROC_WAIT_TIMEOUT):
+        wait_until(self.is_node_stopped, timeout=timeout)
+
+    def node_encrypt_wallet(self, passphrase):
+        """"Encrypts the wallet.
+
+        This causes bitcoind to shutdown, so this method takes
+        care of cleaning up resources."""
+        self.encryptwallet(passphrase)
+        self.wait_until_stopped()
+
+class TestNodeCLI():
+    """Interface to bitcoin-cli for an individual node"""
+
+    def __init__(self, binary, datadir):
+        self.args = []
+        self.binary = binary
+        self.datadir = datadir
+        self.input = None
+
+    def __call__(self, *args, input=None):
+        # TestNodeCLI is callable with bitcoin-cli command-line args
+        self.args = [str(arg) for arg in args]
+        self.input = input
+        return self
+
+    def __getattr__(self, command):
+        def dispatcher(*args, **kwargs):
+            return self.send_cli(command, *args, **kwargs)
+        return dispatcher
+
+    def send_cli(self, command, *args, **kwargs):
+        """Run bitcoin-cli command. Deserializes returned string as python object."""
+
+        pos_args = [str(arg) for arg in args]
+        named_args = [str(key) + "=" + str(value) for (key, value) in kwargs.items()]
+        assert not (pos_args and named_args), "Cannot use positional arguments and named arguments in the same bitcoin-cli call"
+        p_args = [self.binary, "-datadir=" + self.datadir] + self.args
+        if named_args:
+            p_args += ["-named"]
+        p_args += [command] + pos_args + named_args
+        process = subprocess.Popen(p_args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
+        cli_stdout, cli_stderr = process.communicate(input=self.input)
+        returncode = process.poll()
+        if returncode:
+            # Ignore cli_stdout, raise with cli_stderr
+            raise subprocess.CalledProcessError(returncode, self.binary, output=cli_stderr)
+        return json.loads(cli_stdout, parse_float=decimal.Decimal)
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index 044d47988..b5d1f3ca1 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -7,11 +7,13 @@
 from base64 import b64encode
 from binascii import hexlify, unhexlify
 from decimal import Decimal, ROUND_DOWN
+import hashlib
 import json
 import logging
 import os
 import random
 import re
+from subprocess import CalledProcessError
 import time
 
 from . import coverage
@@ -49,6 +51,8 @@ def assert_raises(exc, fun, *args, **kwds):
 def assert_raises_message(exc, message, fun, *args, **kwds):
     try:
         fun(*args, **kwds)
+    except JSONRPCException:
+        raise AssertionError("Use assert_raises_rpc_error() to test RPC failures")
     except exc as e:
         if message is not None and message not in e.error['message']:
             raise AssertionError("Expected substring not found:" + e.error['message'])
@@ -57,22 +61,53 @@ def assert_raises_message(exc, message, fun, *args, **kwds):
     else:
         raise AssertionError("No exception raised")
 
-def assert_raises_jsonrpc(code, message, fun, *args, **kwds):
+def assert_raises_process_error(returncode, output, fun, *args, **kwds):
+    """Execute a process and asserts the process return code and output.
+
+    Calls function `fun` with arguments `args` and `kwds`. Catches a CalledProcessError
+    and verifies that the return code and output are as expected. Throws AssertionError if
+    no CalledProcessError was raised or if the return code and output are not as expected.
+
+    Args:
+        returncode (int): the process return code.
+        output (string): [a substring of] the process output.
+        fun (function): the function to call. This should execute a process.
+        args*: positional arguments for the function.
+        kwds**: named arguments for the function.
+    """
+    try:
+        fun(*args, **kwds)
+    except CalledProcessError as e:
+        if returncode != e.returncode:
+            raise AssertionError("Unexpected returncode %i" % e.returncode)
+        if output not in e.output:
+            raise AssertionError("Expected substring not found:" + e.output)
+    else:
+        raise AssertionError("No exception raised")
+
+def assert_raises_rpc_error(code, message, fun, *args, **kwds):
     """Run an RPC and verify that a specific JSONRPC exception code and message is raised.
 
     Calls function `fun` with arguments `args` and `kwds`. Catches a JSONRPCException
     and verifies that the error code and message are as expected. Throws AssertionError if
-    no JSONRPCException was returned or if the error code/message are not as expected.
+    no JSONRPCException was raised or if the error code/message are not as expected.
 
     Args:
         code (int), optional: the error code returned by the RPC call (defined
             in src/rpc/protocol.h). Set to None if checking the error code is not required.
         message (string), optional: [a substring of] the error string returned by the
-            RPC call. Set to None if checking the error string is not required
+            RPC call. Set to None if checking the error string is not required.
         fun (function): the function to call. This should be the name of an RPC.
         args*: positional arguments for the function.
         kwds**: named arguments for the function.
     """
+    assert try_rpc(code, message, fun, *args, **kwds), "No exception raised"
+
+def try_rpc(code, message, fun, *args, **kwds):
+    """Tries to run an rpc command.
+
+    Test against error code and message if the rpc fails.
+    Returns whether a JSONRPCException was raised."""
     try:
         fun(*args, **kwds)
     except JSONRPCException as e:
@@ -81,10 +116,11 @@ def assert_raises_jsonrpc(code, message, fun, *args, **kwds):
             raise AssertionError("Unexpected JSONRPC error code %i" % e.error["code"])
         if (message is not None) and (message not in e.error['message']):
             raise AssertionError("Expected substring not found:" + e.error['message'])
+        return True
     except Exception as e:
         raise AssertionError("Unexpected exception raised: " + type(e).__name__)
     else:
-        raise AssertionError("No exception raised")
+        return False
 
 def assert_is_hex_string(string):
     try:
@@ -148,6 +184,13 @@ def count_bytes(hex_string):
 def bytes_to_hex_str(byte_str):
     return hexlify(byte_str).decode('ascii')
 
+def hash256(byte_str):
+    sha256 = hashlib.sha256()
+    sha256.update(byte_str)
+    sha256d = hashlib.sha256()
+    sha256d.update(sha256.digest())
+    return sha256d.digest()[::-1]
+
 def hex_str_to_bytes(hex_str):
     return unhexlify(hex_str.encode('ascii'))
 
@@ -157,6 +200,28 @@ def str_to_b64str(string):
 def satoshi_round(amount):
     return Decimal(amount).quantize(Decimal('0.00000001'), rounding=ROUND_DOWN)
 
+def wait_until(predicate, *, attempts=float('inf'), timeout=float('inf'), lock=None):
+    if attempts == float('inf') and timeout == float('inf'):
+        timeout = 60
+    attempt = 0
+    timeout += time.time()
+
+    while attempt < attempts and time.time() < timeout:
+        if lock:
+            with lock:
+                if predicate():
+                    return
+        else:
+            if predicate():
+                return
+        attempt += 1
+        time.sleep(0.05)
+
+    # Print the cause of the timeout
+    assert_greater_than(attempts, attempt)
+    assert_greater_than(timeout, time.time())
+    raise RuntimeError('Unreachable')
+
 # RPC/P2P connection constants and functions
 ############################################
 
@@ -204,7 +269,7 @@ def rpc_port(n):
     return PORT_MIN + PORT_RANGE + n + (MAX_NODES * PortSeed.n) % (PORT_RANGE - 1 - MAX_NODES)
 
 def rpc_url(datadir, i, rpchost=None):
-    rpc_u, rpc_p = get_auth_cookie(datadir, i)
+    rpc_u, rpc_p = get_auth_cookie(datadir)
     host = '127.0.0.1'
     port = rpc_port(i)
     if rpchost:
@@ -232,7 +297,7 @@ def initialize_datadir(dirname, n):
 def get_datadir_path(dirname, n):
     return os.path.join(dirname, "node" + str(n))
 
-def get_auth_cookie(datadir, n):
+def get_auth_cookie(datadir):
     user = None
     password = None
     if os.path.isfile(os.path.join(datadir, "chips.conf")):
diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py
index dfd3b8989..80a5ffefb 100755
--- a/test/functional/test_runner.py
+++ b/test/functional/test_runner.py
@@ -79,7 +79,9 @@
     'rawtransactions.py',
     'reindex.py',
     # vv Tests less than 30s vv
+    'keypool-topup.py',
     'zmq_test.py',
+    'bitcoin_cli.py',
     'mempool_resurrect_test.py',
     'txn_doublespend.py --mineblock',
     'txn_clone.py',
@@ -96,6 +98,7 @@
     'disconnect_ban.py',
     'decodescript.py',
     'blockchain.py',
+    'deprecated_rpc.py',
     'disablewallet.py',
     'net.py',
     'keypool.py',
@@ -118,6 +121,10 @@
     'bipdersig-p2p.py',
     'bip65-cltv-p2p.py',
     'uptime.py',
+    'resendwallettransactions.py',
+    'minchainwork.py',
+    'p2p-fingerprint.py',
+    'uacomment.py',
 ]
 
 EXTENDED_SCRIPTS = [
@@ -143,7 +150,7 @@
     'example_test.py',
     'txn_doublespend.py',
     'txn_clone.py --mineblock',
-    'forknotify.py',
+    'notifications.py',
     'invalidateblock.py',
     'p2p-acceptblock.py',
     'replace-by-fee.py',
@@ -168,7 +175,7 @@ def main():
     Help text and arguments for individual test script:''',
                                      formatter_class=argparse.RawTextHelpFormatter)
     parser.add_argument('--coverage', action='store_true', help='generate a basic coverage report for the RPC interface')
-    parser.add_argument('--exclude', '-x', help='specify a comma-seperated-list of scripts to exclude.')
+    parser.add_argument('--exclude', '-x', help='specify a comma-separated-list of scripts to exclude.')
     parser.add_argument('--extended', action='store_true', help='run the extended test suite in addition to the basic tests')
     parser.add_argument('--force', '-f', action='store_true', help='run tests even on platforms where they are disabled by default (e.g. windows).')
     parser.add_argument('--help', '-h', '-?', action='store_true', help='print help text and exit')
@@ -277,6 +284,7 @@ def run_tests(test_list, src_dir, build_dir, exeext, tmpdir, jobs=1, enable_cove
     #Set env vars
     if "BITCOIND" not in os.environ:
         os.environ["BITCOIND"] = build_dir + '/src/bitcoind' + exeext
+        os.environ["BITCOINCLI"] = build_dir + '/src/bitcoin-cli' + exeext
 
     tests_dir = src_dir + '/test/functional/'
 
@@ -350,7 +358,7 @@ def print_results(test_results, max_len_name, runtime):
 
 class TestHandler:
     """
-    Trigger the testscrips passed in via the list.
+    Trigger the test scripts passed in via the list.
     """
 
     def __init__(self, num_tests_parallel, tests_dir, tmpdir, test_list=None, flags=None):
@@ -452,7 +460,7 @@ def check_script_list(src_dir):
             # On travis this warning is an error to prevent merging incomplete commits into master
             sys.exit(1)
 
-class RPCCoverage(object):
+class RPCCoverage():
     """
     Coverage reporting utilities for test_runner.
 
diff --git a/test/functional/txn_clone.py b/test/functional/txn_clone.py
index 9b81af96c..740bb2d4c 100755
--- a/test/functional/txn_clone.py
+++ b/test/functional/txn_clone.py
@@ -8,11 +8,8 @@
 from test_framework.util import *
 
 class TxnMallTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 4
-        self.setup_clean_chain = False
 
     def add_options(self, parser):
         parser.add_option("--mineblock", dest="mine_block", default=False, action="store_true",
diff --git a/test/functional/txn_doublespend.py b/test/functional/txn_doublespend.py
index 1bd3b3271..69629ef95 100755
--- a/test/functional/txn_doublespend.py
+++ b/test/functional/txn_doublespend.py
@@ -8,11 +8,8 @@
 from test_framework.util import *
 
 class TxnMallTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.num_nodes = 4
-        self.setup_clean_chain = False
 
     def add_options(self, parser):
         parser.add_option("--mineblock", dest="mine_block", default=False, action="store_true",
diff --git a/test/functional/uacomment.py b/test/functional/uacomment.py
new file mode 100755
index 000000000..0b2c64ab6
--- /dev/null
+++ b/test/functional/uacomment.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test the -uacomment option."""
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal
+
+class UacommentTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 1
+        self.setup_clean_chain = True
+
+    def run_test(self):
+        self.log.info("test multiple -uacomment")
+        test_uacomment = self.nodes[0].getnetworkinfo()["subversion"][-12:-1]
+        assert_equal(test_uacomment, "(testnode0)")
+
+        self.restart_node(0, ["-uacomment=foo"])
+        foo_uacomment = self.nodes[0].getnetworkinfo()["subversion"][-17:-1]
+        assert_equal(foo_uacomment, "(testnode0; foo)")
+
+        self.log.info("test -uacomment max length")
+        self.stop_node(0)
+        expected = "Total length of network version string (286) exceeds maximum length (256). Reduce the number or size of uacomments."
+        self.assert_start_raises_init_error(0, ["-uacomment=" + 'a' * 256], expected)
+
+        self.log.info("test -uacomment unsafe characters")
+        for unsafe_char in ['/', ':', '(', ')']:
+            expected = "User Agent comment (" + unsafe_char + ") contains unsafe characters"
+            self.assert_start_raises_init_error(0, ["-uacomment=" + unsafe_char], expected)
+
+if __name__ == '__main__':
+    UacommentTest().main()
diff --git a/test/functional/uptime.py b/test/functional/uptime.py
index b20d6f5cb..78236b239 100755
--- a/test/functional/uptime.py
+++ b/test/functional/uptime.py
@@ -13,9 +13,7 @@
 
 
 class UptimeTest(BitcoinTestFramework):
-    def __init__(self):
-        super().__init__()
-
+    def set_test_params(self):
         self.num_nodes = 1
         self.setup_clean_chain = True
 
diff --git a/test/functional/wallet-accounts.py b/test/functional/wallet-accounts.py
index 158aa9ae8..40726d2a7 100755
--- a/test/functional/wallet-accounts.py
+++ b/test/functional/wallet-accounts.py
@@ -17,9 +17,7 @@
 from test_framework.util import assert_equal
 
 class WalletAccountsTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
         self.extra_args = [[]]
diff --git a/test/functional/wallet-dump.py b/test/functional/wallet-dump.py
index 569cc46e6..47de8777a 100755
--- a/test/functional/wallet-dump.py
+++ b/test/functional/wallet-dump.py
@@ -7,7 +7,7 @@
 import os
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal
+from test_framework.util import (assert_equal, assert_raises_rpc_error)
 
 
 def read_dump(file_name, addrs, hd_master_addr_old):
@@ -56,10 +56,7 @@ def read_dump(file_name, addrs, hd_master_addr_old):
 
 
 class WalletDumpTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = False
+    def set_test_params(self):
         self.num_nodes = 1
         self.extra_args = [["-keypool=90"]]
 
@@ -68,7 +65,8 @@ def setup_network(self, split=False):
         # longer than the default 30 seconds due to an expensive
         # CWallet::TopUpKeyPool call, and the encryptwallet RPC made later in
         # the test often takes even longer.
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, self.extra_args, timewait=60)
+        self.add_nodes(self.num_nodes, self.extra_args, timewait=60)
+        self.start_nodes()
 
     def run_test (self):
         tmpdir = self.options.tmpdir
@@ -94,19 +92,21 @@ def run_test (self):
         assert_equal(found_addr_rsv, 90*2) # 90 keys plus 100% internal keys
 
         #encrypt wallet, restart, unlock and dump
-        self.nodes[0].encryptwallet('test')
-        self.bitcoind_processes[0].wait()
-        self.nodes[0] = self.start_node(0, self.options.tmpdir, self.extra_args[0])
+        self.nodes[0].node_encrypt_wallet('test')
+        self.start_node(0)
         self.nodes[0].walletpassphrase('test', 10)
         # Should be a no-op:
         self.nodes[0].keypoolrefill()
         self.nodes[0].dumpwallet(tmpdir + "/node0/wallet.encrypted.dump")
 
-        found_addr, found_addr_chg, found_addr_rsv, hd_master_addr_enc = \
+        found_addr, found_addr_chg, found_addr_rsv, _ = \
             read_dump(tmpdir + "/node0/wallet.encrypted.dump", addrs, hd_master_addr_unenc)
         assert_equal(found_addr, test_addr_count)
         assert_equal(found_addr_chg, 90*2 + 50)  # old reserve keys are marked as change now
         assert_equal(found_addr_rsv, 90*2) 
 
+        # Overwriting should fail
+        assert_raises_rpc_error(-8, "already exists", self.nodes[0].dumpwallet, tmpdir + "/node0/wallet.unencrypted.dump")
+
 if __name__ == '__main__':
     WalletDumpTest().main ()
diff --git a/test/functional/wallet-encryption.py b/test/functional/wallet-encryption.py
index ba72918fe..db62e1e30 100755
--- a/test/functional/wallet-encryption.py
+++ b/test/functional/wallet-encryption.py
@@ -6,16 +6,14 @@
 
 import time
 
-from test_framework.test_framework import BitcoinTestFramework, BITCOIND_PROC_WAIT_TIMEOUT
+from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
-    assert_raises_jsonrpc,
+    assert_raises_rpc_error,
 )
 
 class WalletEncryptionTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
 
@@ -30,12 +28,11 @@ def run_test(self):
         assert_equal(len(privkey), 52)
 
         # Encrypt the wallet
-        self.nodes[0].encryptwallet(passphrase)
-        self.bitcoind_processes[0].wait(timeout=BITCOIND_PROC_WAIT_TIMEOUT)
-        self.nodes[0] = self.start_node(0, self.options.tmpdir)
+        self.nodes[0].node_encrypt_wallet(passphrase)
+        self.start_node(0)
 
         # Test that the wallet is encrypted
-        assert_raises_jsonrpc(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].dumpprivkey, address)
+        assert_raises_rpc_error(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].dumpprivkey, address)
 
         # Check that walletpassphrase works
         self.nodes[0].walletpassphrase(passphrase, 2)
@@ -43,20 +40,20 @@ def run_test(self):
 
         # Check that the timeout is right
         time.sleep(2)
-        assert_raises_jsonrpc(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].dumpprivkey, address)
+        assert_raises_rpc_error(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].dumpprivkey, address)
 
         # Test wrong passphrase
-        assert_raises_jsonrpc(-14, "wallet passphrase entered was incorrect", self.nodes[0].walletpassphrase, passphrase + "wrong", 10)
+        assert_raises_rpc_error(-14, "wallet passphrase entered was incorrect", self.nodes[0].walletpassphrase, passphrase + "wrong", 10)
 
         # Test walletlock
         self.nodes[0].walletpassphrase(passphrase, 84600)
         assert_equal(privkey, self.nodes[0].dumpprivkey(address))
         self.nodes[0].walletlock()
-        assert_raises_jsonrpc(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].dumpprivkey, address)
+        assert_raises_rpc_error(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].dumpprivkey, address)
 
         # Test passphrase changes
         self.nodes[0].walletpassphrasechange(passphrase, passphrase2)
-        assert_raises_jsonrpc(-14, "wallet passphrase entered was incorrect", self.nodes[0].walletpassphrase, passphrase, 10)
+        assert_raises_rpc_error(-14, "wallet passphrase entered was incorrect", self.nodes[0].walletpassphrase, passphrase, 10)
         self.nodes[0].walletpassphrase(passphrase2, 10)
         assert_equal(privkey, self.nodes[0].dumpprivkey(address))
 
diff --git a/test/functional/wallet-hd.py b/test/functional/wallet-hd.py
index dfd3dc83c..9b6ce6860 100755
--- a/test/functional/wallet-hd.py
+++ b/test/functional/wallet-hd.py
@@ -9,25 +9,22 @@
     assert_equal,
     connect_nodes_bi,
 )
-import os
 import shutil
-
+import os
 
 class WalletHDTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
-        self.extra_args = [['-usehd=0'], ['-usehd=1', '-keypool=0']]
+        self.extra_args = [[], ['-keypool=0']]
 
     def run_test (self):
         tmpdir = self.options.tmpdir
 
         # Make sure can't switch off usehd after wallet creation
         self.stop_node(1)
-        self.assert_start_raises_init_error(1, self.options.tmpdir, ['-usehd=0'], 'already existing HD wallet')
-        self.nodes[1] = self.start_node(1, self.options.tmpdir, self.extra_args[1])
+        self.assert_start_raises_init_error(1, ['-usehd=0'], 'already existing HD wallet')
+        self.start_node(1)
         connect_nodes_bi(self.nodes, 0, 1)
 
         # Make sure we use hd, keep masterkeyid
@@ -43,7 +40,7 @@ def run_test (self):
         non_hd_add = self.nodes[0].getnewaddress()
         self.nodes[1].importprivkey(self.nodes[0].dumpprivkey(non_hd_add))
 
-        # This should be enough to keep the master key and the non-HD key 
+        # This should be enough to keep the master key and the non-HD key
         self.nodes[1].backupwallet(tmpdir + "/hd.bak")
         #self.nodes[1].dumpwallet(tmpdir + "/hd.dump")
 
@@ -55,7 +52,7 @@ def run_test (self):
         for i in range(num_hd_adds):
             hd_add = self.nodes[1].getnewaddress()
             hd_info = self.nodes[1].validateaddress(hd_add)
-            assert_equal(hd_info["hdkeypath"], "m/0'/0'/"+str(i+1)+"'")
+            assert_equal(hd_info["hdkeypath"], "m/0'/0'/"+str(i)+"'")
             assert_equal(hd_info["hdmasterkeyid"], masterkeyid)
             self.nodes[0].sendtoaddress(hd_add, 1)
             self.nodes[0].generate(1)
@@ -72,24 +69,43 @@ def run_test (self):
 
         self.log.info("Restore backup ...")
         self.stop_node(1)
-        os.remove(self.options.tmpdir + "/node1/regtest/wallet.dat")
-        shutil.copyfile(tmpdir + "/hd.bak", tmpdir + "/node1/regtest/wallet.dat")
-        self.nodes[1] = self.start_node(1, self.options.tmpdir, self.extra_args[1])
-        #connect_nodes_bi(self.nodes, 0, 1)
+        # we need to delete the complete regtest directory
+        # otherwise node1 would auto-recover all funds in flag the keypool keys as used
+        shutil.rmtree(os.path.join(tmpdir, "node1/regtest/blocks"))
+        shutil.rmtree(os.path.join(tmpdir, "node1/regtest/chainstate"))
+        shutil.copyfile(os.path.join(tmpdir, "hd.bak"), os.path.join(tmpdir, "node1/regtest/wallet.dat"))
+        self.start_node(1)
 
         # Assert that derivation is deterministic
         hd_add_2 = None
         for _ in range(num_hd_adds):
             hd_add_2 = self.nodes[1].getnewaddress()
             hd_info_2 = self.nodes[1].validateaddress(hd_add_2)
-            assert_equal(hd_info_2["hdkeypath"], "m/0'/0'/"+str(_+1)+"'")
+            assert_equal(hd_info_2["hdkeypath"], "m/0'/0'/"+str(_)+"'")
             assert_equal(hd_info_2["hdmasterkeyid"], masterkeyid)
         assert_equal(hd_add, hd_add_2)
+        connect_nodes_bi(self.nodes, 0, 1)
+        self.sync_all()
 
         # Needs rescan
         self.stop_node(1)
-        self.nodes[1] = self.start_node(1, self.options.tmpdir, self.extra_args[1] + ['-rescan'])
-        #connect_nodes_bi(self.nodes, 0, 1)
+        self.start_node(1, extra_args=self.extra_args[1] + ['-rescan'])
+        assert_equal(self.nodes[1].getbalance(), num_hd_adds + 1)
+
+        # Try a RPC based rescan
+        self.stop_node(1)
+        shutil.rmtree(os.path.join(tmpdir, "node1/regtest/blocks"))
+        shutil.rmtree(os.path.join(tmpdir, "node1/regtest/chainstate"))
+        shutil.copyfile(os.path.join(tmpdir, "hd.bak"), os.path.join(tmpdir, "node1/regtest/wallet.dat"))
+        self.start_node(1, extra_args=self.extra_args[1])
+        connect_nodes_bi(self.nodes, 0, 1)
+        self.sync_all()
+        out = self.nodes[1].rescanblockchain(0, 1)
+        assert_equal(out['start_height'], 0)
+        assert_equal(out['stop_height'], 1)
+        out = self.nodes[1].rescanblockchain()
+        assert_equal(out['start_height'], 0)
+        assert_equal(out['stop_height'], self.nodes[1].getblockcount())
         assert_equal(self.nodes[1].getbalance(), num_hd_adds + 1)
 
         # send a tx and make sure its using the internal chain for the changeoutput
@@ -99,7 +115,7 @@ def run_test (self):
         for out in outs:
             if out['value'] != 1:
                 keypath = self.nodes[1].validateaddress(out['scriptPubKey']['addresses'][0])['hdkeypath']
-        
+
         assert_equal(keypath[0:7], "m/0'/1'")
 
 if __name__ == '__main__':
diff --git a/test/functional/wallet.py b/test/functional/wallet.py
index 3e3e8fcdd..9d8ae5035 100755
--- a/test/functional/wallet.py
+++ b/test/functional/wallet.py
@@ -7,28 +7,27 @@
 from test_framework.util import *
 
 class WalletTest(BitcoinTestFramework):
-
-    def check_fee_amount(self, curr_balance, balance_with_fee, fee_per_byte, tx_size):
-        """Return curr_balance after asserting the fee was in range"""
-        fee = balance_with_fee - curr_balance
-        assert_fee_amount(fee, tx_size, fee_per_byte * 1000)
-        return curr_balance
-
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = True
+    def set_test_params(self):
         self.num_nodes = 4
-        self.extra_args = [['-usehd={:d}'.format(i%2==0)] for i in range(4)]
+        self.setup_clean_chain = True
 
     def setup_network(self):
-        self.nodes = self.start_nodes(3, self.options.tmpdir, self.extra_args[:3])
+        self.add_nodes(4)
+        self.start_node(0)
+        self.start_node(1)
+        self.start_node(2)
         connect_nodes_bi(self.nodes,0,1)
         connect_nodes_bi(self.nodes,1,2)
         connect_nodes_bi(self.nodes,0,2)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
 
-    def run_test(self):
+    def check_fee_amount(self, curr_balance, balance_with_fee, fee_per_byte, tx_size):
+        """Return curr_balance after asserting the fee was in range"""
+        fee = balance_with_fee - curr_balance
+        assert_fee_amount(fee, tx_size, fee_per_byte * 1000)
+        return curr_balance
 
+    def run_test(self):
         # Check that there's no UTXO on none of the nodes
         assert_equal(len(self.nodes[0].listunspent()), 0)
         assert_equal(len(self.nodes[1].listunspent()), 0)
@@ -42,9 +41,9 @@ def run_test(self):
         assert_equal(walletinfo['immature_balance'], 50)
         assert_equal(walletinfo['balance'], 0)
 
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
         self.nodes[1].generate(101)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
 
         assert_equal(self.nodes[0].getbalance(), 50)
         assert_equal(self.nodes[1].getbalance(), 50)
@@ -56,6 +55,15 @@ def run_test(self):
         assert_equal(len(self.nodes[1].listunspent()), 1)
         assert_equal(len(self.nodes[2].listunspent()), 0)
 
+        self.log.info("test gettxout")
+        confirmed_txid, confirmed_index = utxos[0]["txid"], utxos[0]["vout"]
+        # First, outputs that are unspent both in the chain and in the
+        # mempool should appear with or without include_mempool
+        txout = self.nodes[0].gettxout(txid=confirmed_txid, n=confirmed_index, include_mempool=False)
+        assert_equal(txout['value'], 50)
+        txout = self.nodes[0].gettxout(txid=confirmed_txid, n=confirmed_index, include_mempool=True)
+        assert_equal(txout['value'], 50)
+        
         # Send 21 BTC from 0 to 2 using sendtoaddress call.
         # Locked memory should use at least 32 bytes to sign each transaction
         self.log.info("test getmemoryinfo")
@@ -65,10 +73,9 @@ def run_test(self):
         memory_after = self.nodes[0].getmemoryinfo()
         assert(memory_before['locked']['used'] + 64 <= memory_after['locked']['used'])
 
-        self.log.info("test gettxout")
+        self.log.info("test gettxout (second part)")
         # utxo spent in mempool should be visible if you exclude mempool
         # but invisible if you include mempool
-        confirmed_txid, confirmed_index = utxos[0]["txid"], utxos[0]["vout"]
         txout = self.nodes[0].gettxout(confirmed_txid, confirmed_index, False)
         assert_equal(txout['value'], 50)
         txout = self.nodes[0].gettxout(confirmed_txid, confirmed_index, True)
@@ -88,20 +95,20 @@ def run_test(self):
 
         # Have node0 mine a block, thus it will collect its own fee.
         self.nodes[0].generate(1)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
 
         # Exercise locking of unspent outputs
         unspent_0 = self.nodes[2].listunspent()[0]
         unspent_0 = {"txid": unspent_0["txid"], "vout": unspent_0["vout"]}
         self.nodes[2].lockunspent(False, [unspent_0])
-        assert_raises_jsonrpc(-4, "Insufficient funds", self.nodes[2].sendtoaddress, self.nodes[2].getnewaddress(), 20)
+        assert_raises_rpc_error(-4, "Insufficient funds", self.nodes[2].sendtoaddress, self.nodes[2].getnewaddress(), 20)
         assert_equal([unspent_0], self.nodes[2].listlockunspent())
         self.nodes[2].lockunspent(True, [unspent_0])
         assert_equal(len(self.nodes[2].listlockunspent()), 0)
 
         # Have node1 generate 100 blocks (so node0 can recover the fee)
         self.nodes[1].generate(100)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
 
         # node0 should end up with 100 btc in block rewards plus fees, but
         # minus the 21 plus fees sent to node2
@@ -130,7 +137,7 @@ def run_test(self):
 
         # Have node1 mine a block to confirm transactions:
         self.nodes[1].generate(1)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
 
         assert_equal(self.nodes[0].getbalance(), 0)
         assert_equal(self.nodes[2].getbalance(), 94)
@@ -142,14 +149,14 @@ def run_test(self):
         self.nodes[2].settxfee(fee_per_byte * 1000)
         txid = self.nodes[2].sendtoaddress(address, 10, "", "", False)
         self.nodes[2].generate(1)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
         node_2_bal = self.check_fee_amount(self.nodes[2].getbalance(), Decimal('84'), fee_per_byte, count_bytes(self.nodes[2].getrawtransaction(txid)))
         assert_equal(self.nodes[0].getbalance(), Decimal('10'))
 
         # Send 10 BTC with subtract fee from amount
         txid = self.nodes[2].sendtoaddress(address, 10, "", "", True)
         self.nodes[2].generate(1)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
         node_2_bal -= Decimal('10')
         assert_equal(self.nodes[2].getbalance(), node_2_bal)
         node_0_bal = self.check_fee_amount(self.nodes[0].getbalance(), Decimal('20'), fee_per_byte, count_bytes(self.nodes[2].getrawtransaction(txid)))
@@ -157,7 +164,7 @@ def run_test(self):
         # Sendmany 10 BTC
         txid = self.nodes[2].sendmany('from1', {address: 10}, 0, "", [])
         self.nodes[2].generate(1)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
         node_0_bal += Decimal('10')
         node_2_bal = self.check_fee_amount(self.nodes[2].getbalance(), node_2_bal - Decimal('10'), fee_per_byte, count_bytes(self.nodes[2].getrawtransaction(txid)))
         assert_equal(self.nodes[0].getbalance(), node_0_bal)
@@ -165,7 +172,7 @@ def run_test(self):
         # Sendmany 10 BTC with subtract fee from amount
         txid = self.nodes[2].sendmany('from1', {address: 10}, 0, "", [address])
         self.nodes[2].generate(1)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
         node_2_bal -= Decimal('10')
         assert_equal(self.nodes[2].getbalance(), node_2_bal)
         node_0_bal = self.check_fee_amount(self.nodes[0].getbalance(), node_0_bal + Decimal('10'), fee_per_byte, count_bytes(self.nodes[2].getrawtransaction(txid)))
@@ -176,9 +183,9 @@ def run_test(self):
         # EXPECT: nodes[3] should have those transactions in its mempool.
         txid1 = self.nodes[0].sendtoaddress(self.nodes[1].getnewaddress(), 1)
         txid2 = self.nodes[1].sendtoaddress(self.nodes[0].getnewaddress(), 1)
-        sync_mempools(self.nodes)
+        sync_mempools(self.nodes[0:2])
 
-        self.nodes.append(self.start_node(3, self.options.tmpdir, self.extra_args[3]))
+        self.start_node(3)
         connect_nodes_bi(self.nodes, 0, 3)
         sync_blocks(self.nodes)
 
@@ -206,7 +213,7 @@ def run_test(self):
         signedRawTx = self.nodes[1].signrawtransaction(rawTx)
         decRawTx = self.nodes[1].decoderawtransaction(signedRawTx['hex'])
         zeroValueTxid= decRawTx['txid']
-        sendResp = self.nodes[1].sendrawtransaction(signedRawTx['hex'])
+        self.nodes[1].sendrawtransaction(signedRawTx['hex'])
 
         self.sync_all()
         self.nodes[1].generate(1) #mine a block
@@ -222,22 +229,24 @@ def run_test(self):
 
         #do some -walletbroadcast tests
         self.stop_nodes()
-        self.nodes = self.start_nodes(3, self.options.tmpdir, [["-walletbroadcast=0"],["-walletbroadcast=0"],["-walletbroadcast=0"]])
+        self.start_node(0, ["-walletbroadcast=0"])
+        self.start_node(1, ["-walletbroadcast=0"])
+        self.start_node(2, ["-walletbroadcast=0"])
         connect_nodes_bi(self.nodes,0,1)
         connect_nodes_bi(self.nodes,1,2)
         connect_nodes_bi(self.nodes,0,2)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
 
         txIdNotBroadcasted  = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), 2)
         txObjNotBroadcasted = self.nodes[0].gettransaction(txIdNotBroadcasted)
         self.nodes[1].generate(1) #mine a block, tx should not be in there
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
         assert_equal(self.nodes[2].getbalance(), node_2_bal) #should not be changed because tx was not broadcasted
 
         #now broadcast from another node, mine a block, sync, and check the balance
         self.nodes[1].sendrawtransaction(txObjNotBroadcasted['hex'])
         self.nodes[1].generate(1)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
         node_2_bal += 2
         txObjNotBroadcasted = self.nodes[0].gettransaction(txIdNotBroadcasted)
         assert_equal(self.nodes[2].getbalance(), node_2_bal)
@@ -247,14 +256,16 @@ def run_test(self):
 
         #restart the nodes with -walletbroadcast=1
         self.stop_nodes()
-        self.nodes = self.start_nodes(3, self.options.tmpdir)
+        self.start_node(0)
+        self.start_node(1)
+        self.start_node(2)
         connect_nodes_bi(self.nodes,0,1)
         connect_nodes_bi(self.nodes,1,2)
         connect_nodes_bi(self.nodes,0,2)
-        sync_blocks(self.nodes)
+        sync_blocks(self.nodes[0:3])
 
         self.nodes[0].generate(1)
-        sync_blocks(self.nodes)
+        sync_blocks(self.nodes[0:3])
         node_2_bal += 2
 
         #tx should be added to balance because after restarting the nodes tx should be broadcastet
@@ -275,17 +286,17 @@ def run_test(self):
         assert_equal(txObj['amount'], Decimal('-0.0001'))
 
         # This will raise an exception because the amount type is wrong
-        assert_raises_jsonrpc(-3, "Invalid amount", self.nodes[0].sendtoaddress, self.nodes[2].getnewaddress(), "1f-4")
+        assert_raises_rpc_error(-3, "Invalid amount", self.nodes[0].sendtoaddress, self.nodes[2].getnewaddress(), "1f-4")
 
         # This will raise an exception since generate does not accept a string
-        assert_raises_jsonrpc(-1, "not an integer", self.nodes[0].generate, "2")
+        assert_raises_rpc_error(-1, "not an integer", self.nodes[0].generate, "2")
 
         # Import address and private key to check correct behavior of spendable unspents
         # 1. Send some coins to generate new UTXO
         address_to_import = self.nodes[2].getnewaddress()
         txid = self.nodes[0].sendtoaddress(address_to_import, 1)
         self.nodes[0].generate(1)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
 
         # 2. Import address from node2 to node1
         self.nodes[1].importaddress(address_to_import)
@@ -311,15 +322,15 @@ def run_test(self):
         cbAddr = self.nodes[1].getnewaddress()
         blkHash = self.nodes[0].generatetoaddress(1, cbAddr)[0]
         cbTxId = self.nodes[0].getblock(blkHash)['tx'][0]
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
 
         # Check that the txid and balance is found by node1
         self.nodes[1].gettransaction(cbTxId)
 
         # check if wallet or blockchain maintenance changes the balance
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
         blocks = self.nodes[0].generate(2)
-        self.sync_all()
+        self.sync_all([self.nodes[0:3]])
         balance_nodes = [self.nodes[i].getbalance() for i in range(3)]
         block_count = self.nodes[0].getblockcount()
 
@@ -350,7 +361,9 @@ def run_test(self):
             self.log.info("check " + m)
             self.stop_nodes()
             # set lower ancestor limit for later
-            self.nodes = self.start_nodes(3, self.options.tmpdir, [[m, "-limitancestorcount="+str(chainlimit)]] * 3)
+            self.start_node(0, [m, "-limitancestorcount="+str(chainlimit)])
+            self.start_node(1, [m, "-limitancestorcount="+str(chainlimit)])
+            self.start_node(2, [m, "-limitancestorcount="+str(chainlimit)])
             while m == '-reindex' and [block_count] * 3 != [self.nodes[i].getblockcount() for i in range(3)]:
                 # reindex will leave rpc warm up "early"; Wait for it to finish
                 time.sleep(0.1)
@@ -398,7 +411,7 @@ def run_test(self):
         # Try with walletrejectlongchains
         # Double chain limit but require combining inputs, so we pass SelectCoinsMinConf
         self.stop_node(0)
-        self.nodes[0] = self.start_node(0, self.options.tmpdir, ["-walletrejectlongchains", "-limitancestorcount="+str(2*chainlimit)])
+        self.start_node(0, extra_args=["-walletrejectlongchains", "-limitancestorcount="+str(2*chainlimit)])
 
         # wait for loadmempool
         timeout = 10
@@ -409,7 +422,7 @@ def run_test(self):
 
         node0_balance = self.nodes[0].getbalance()
         # With walletrejectlongchains we will not create the tx and store it in our wallet.
-        assert_raises_jsonrpc(-4, "Transaction has too long of a mempool chain", self.nodes[0].sendtoaddress, sending_addr, node0_balance - Decimal('0.01'))
+        assert_raises_rpc_error(-4, "Transaction has too long of a mempool chain", self.nodes[0].sendtoaddress, sending_addr, node0_balance - Decimal('0.01'))
 
         # Verify nothing new in wallet
         assert_equal(total_txs, len(self.nodes[0].listtransactions("*",99999)))
diff --git a/test/functional/walletbackup.py b/test/functional/walletbackup.py
index ff51cba4b..15ea26afa 100755
--- a/test/functional/walletbackup.py
+++ b/test/functional/walletbackup.py
@@ -37,11 +37,9 @@
 from test_framework.util import *
 
 class WalletBackupTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = True
+    def set_test_params(self):
         self.num_nodes = 4
+        self.setup_clean_chain = True
         # nodes 1, 2,3 are spenders, let's give them a keypool=100
         self.extra_args = [["-keypool=100"], ["-keypool=100"], ["-keypool=100"], []]
 
@@ -78,9 +76,9 @@ def do_one_round(self):
 
     # As above, this mirrors the original bash test.
     def start_three(self):
-        self.nodes[0] = self.start_node(0, self.options.tmpdir)
-        self.nodes[1] = self.start_node(1, self.options.tmpdir)
-        self.nodes[2] = self.start_node(2, self.options.tmpdir)
+        self.start_node(0)
+        self.start_node(1)
+        self.start_node(2)
         connect_nodes(self.nodes[0], 3)
         connect_nodes(self.nodes[1], 3)
         connect_nodes(self.nodes[2], 3)
diff --git a/test/functional/zapwallettxes.py b/test/functional/zapwallettxes.py
index af867d7a5..8cd622dc8 100755
--- a/test/functional/zapwallettxes.py
+++ b/test/functional/zapwallettxes.py
@@ -15,14 +15,14 @@
   been zapped.
 """
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import (assert_equal,
-                                 assert_raises_jsonrpc,
-                                 )
+from test_framework.util import (
+    assert_equal,
+    assert_raises_rpc_error,
+    wait_until,
+)
 
 class ZapWalletTXesTest (BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
 
@@ -48,7 +48,7 @@ def run_test(self):
 
         # Stop-start node0. Both confirmed and unconfirmed transactions remain in the wallet.
         self.stop_node(0)
-        self.nodes[0] = self.start_node(0, self.options.tmpdir)
+        self.start_node(0)
 
         assert_equal(self.nodes[0].gettransaction(txid1)['txid'], txid1)
         assert_equal(self.nodes[0].gettransaction(txid2)['txid'], txid2)
@@ -56,7 +56,9 @@ def run_test(self):
         # Stop node0 and restart with zapwallettxes and persistmempool. The unconfirmed
         # transaction is zapped from the wallet, but is re-added when the mempool is reloaded.
         self.stop_node(0)
-        self.nodes[0] = self.start_node(0, self.options.tmpdir, ["-persistmempool=1", "-zapwallettxes=2"])
+        self.start_node(0, ["-persistmempool=1", "-zapwallettxes=2"])
+
+        wait_until(lambda: self.nodes[0].getmempoolinfo()['size'] == 1, timeout=3)
 
         assert_equal(self.nodes[0].gettransaction(txid1)['txid'], txid1)
         assert_equal(self.nodes[0].gettransaction(txid2)['txid'], txid2)
@@ -64,13 +66,13 @@ def run_test(self):
         # Stop node0 and restart with zapwallettxes, but not persistmempool.
         # The unconfirmed transaction is zapped and is no longer in the wallet.
         self.stop_node(0)
-        self.nodes[0] = self.start_node(0, self.options.tmpdir, ["-zapwallettxes=2"])
+        self.start_node(0, ["-zapwallettxes=2"])
 
         # tx1 is still be available because it was confirmed
         assert_equal(self.nodes[0].gettransaction(txid1)['txid'], txid1)
 
         # This will raise an exception because the unconfirmed transaction has been zapped
-        assert_raises_jsonrpc(-5, 'Invalid or non-wallet transaction id', self.nodes[0].gettransaction, txid2)
+        assert_raises_rpc_error(-5, 'Invalid or non-wallet transaction id', self.nodes[0].gettransaction, txid2)
 
 if __name__ == '__main__':
     ZapWalletTXesTest().main()
diff --git a/test/functional/zmq_test.py b/test/functional/zmq_test.py
index 26c946d21..165f9192d 100755
--- a/test/functional/zmq_test.py
+++ b/test/functional/zmq_test.py
@@ -2,7 +2,7 @@
 # Copyright (c) 2015-2016 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
-"""Test the ZMQ API."""
+"""Test the ZMQ notification interface."""
 import configparser
 import os
 import struct
@@ -10,12 +10,30 @@
 from test_framework.test_framework import BitcoinTestFramework, SkipTest
 from test_framework.util import (assert_equal,
                                  bytes_to_hex_str,
-                                 )
+                                 hash256,
+                                )
+
+class ZMQSubscriber:
+    def __init__(self, socket, topic):
+        self.sequence = 0
+        self.socket = socket
+        self.topic = topic
+
+        import zmq
+        self.socket.setsockopt(zmq.SUBSCRIBE, self.topic)
+
+    def receive(self):
+        topic, body, seq = self.socket.recv_multipart()
+        # Topic should match the subscriber topic.
+        assert_equal(topic, self.topic)
+        # Sequence should be incremental.
+        assert_equal(struct.unpack('<I', seq)[-1], self.sequence)
+        self.sequence += 1
+        return body
 
-class ZMQTest (BitcoinTestFramework):
 
-    def __init__(self):
-        super().__init__()
+class ZMQTest (BitcoinTestFramework):
+    def set_test_params(self):
         self.num_nodes = 2
 
     def setup_nodes(self):
@@ -25,90 +43,79 @@ def setup_nodes(self):
         except ImportError:
             raise SkipTest("python3-zmq module not available.")
 
-        # Check that bitcoin has been built with ZMQ enabled
+        # Check that bitcoin has been built with ZMQ enabled.
         config = configparser.ConfigParser()
         if not self.options.configfile:
-            self.options.configfile = os.path.dirname(__file__) + "/../config.ini"
+            self.options.configfile = os.path.abspath(os.path.join(os.path.dirname(__file__), "../config.ini"))
         config.read_file(open(self.options.configfile))
 
         if not config["components"].getboolean("ENABLE_ZMQ"):
             raise SkipTest("bitcoind has not been built with zmq enabled.")
 
-        self.zmqContext = zmq.Context()
-        self.zmqSubSocket = self.zmqContext.socket(zmq.SUB)
-        self.zmqSubSocket.set(zmq.RCVTIMEO, 60000)
-        self.zmqSubSocket.setsockopt(zmq.SUBSCRIBE, b"hashblock")
-        self.zmqSubSocket.setsockopt(zmq.SUBSCRIBE, b"hashtx")
-        ip_address = "tcp://127.0.0.1:28332"
-        self.zmqSubSocket.connect(ip_address)
-        extra_args = [['-zmqpubhashtx=%s' % ip_address, '-zmqpubhashblock=%s' % ip_address], []]
-        self.nodes = self.start_nodes(self.num_nodes, self.options.tmpdir, extra_args)
+        # Initialize ZMQ context and socket.
+        # All messages are received in the same socket which means
+        # that this test fails if the publishing order changes.
+        # Note that the publishing order is not defined in the documentation and
+        # is subject to change.
+        address = "tcp://127.0.0.1:28332"
+        self.zmq_context = zmq.Context()
+        socket = self.zmq_context.socket(zmq.SUB)
+        socket.set(zmq.RCVTIMEO, 60000)
+        socket.connect(address)
+
+        # Subscribe to all available topics.
+        self.hashblock = ZMQSubscriber(socket, b"hashblock")
+        self.hashtx = ZMQSubscriber(socket, b"hashtx")
+        self.rawblock = ZMQSubscriber(socket, b"rawblock")
+        self.rawtx = ZMQSubscriber(socket, b"rawtx")
+
+        self.extra_args = [["-zmqpub%s=%s" % (sub.topic.decode(), address) for sub in [self.hashblock, self.hashtx, self.rawblock, self.rawtx]], []]
+        self.add_nodes(self.num_nodes, self.extra_args)
+        self.start_nodes()
 
     def run_test(self):
         try:
             self._zmq_test()
         finally:
-            # Destroy the zmq context
-            self.log.debug("Destroying zmq context")
-            self.zmqContext.destroy(linger=None)
+            # Destroy the ZMQ context.
+            self.log.debug("Destroying ZMQ context")
+            self.zmq_context.destroy(linger=None)
 
     def _zmq_test(self):
-        genhashes = self.nodes[0].generate(1)
+        num_blocks = 5
+        self.log.info("Generate %(n)d blocks (and %(n)d coinbase txes)" % {"n": num_blocks})
+        genhashes = self.nodes[0].generate(num_blocks)
         self.sync_all()
 
-        self.log.info("Wait for tx")
-        msg = self.zmqSubSocket.recv_multipart()
-        topic = msg[0]
-        assert_equal(topic, b"hashtx")
-        body = msg[1]
-        msgSequence = struct.unpack('<I', msg[-1])[-1]
-        assert_equal(msgSequence, 0)  # must be sequence 0 on hashtx
-
-        self.log.info("Wait for block")
-        msg = self.zmqSubSocket.recv_multipart()
-        topic = msg[0]
-        body = msg[1]
-        msgSequence = struct.unpack('<I', msg[-1])[-1]
-        assert_equal(msgSequence, 0)  # must be sequence 0 on hashblock
-        blkhash = bytes_to_hex_str(body)
-
-        assert_equal(genhashes[0], blkhash)  # blockhash from generate must be equal to the hash received over zmq
-
-        self.log.info("Generate 10 blocks (and 10 coinbase txes)")
-        n = 10
-        genhashes = self.nodes[1].generate(n)
-        self.sync_all()
+        for x in range(num_blocks):
+            # Should receive the coinbase txid.
+            txid = self.hashtx.receive()
+
+            # Should receive the coinbase raw transaction.
+            hex = self.rawtx.receive()
+            assert_equal(hash256(hex), txid)
+
+            # Should receive the generated block hash.
+            hash = bytes_to_hex_str(self.hashblock.receive())
+            assert_equal(genhashes[x], hash)
+            # The block should only have the coinbase txid.
+            assert_equal([bytes_to_hex_str(txid)], self.nodes[1].getblock(hash)["tx"])
 
-        zmqHashes = []
-        blockcount = 0
-        for x in range(n * 2):
-            msg = self.zmqSubSocket.recv_multipart()
-            topic = msg[0]
-            body = msg[1]
-            if topic == b"hashblock":
-                zmqHashes.append(bytes_to_hex_str(body))
-                msgSequence = struct.unpack('<I', msg[-1])[-1]
-                assert_equal(msgSequence, blockcount + 1)
-                blockcount += 1
-
-        for x in range(n):
-            assert_equal(genhashes[x], zmqHashes[x])  # blockhash from generate must be equal to the hash received over zmq
+            # Should receive the generated raw block.
+            block = self.rawblock.receive()
+            assert_equal(genhashes[x], bytes_to_hex_str(hash256(block[:80])))
 
         self.log.info("Wait for tx from second node")
-        # test tx from a second node
-        hashRPC = self.nodes[1].sendtoaddress(self.nodes[0].getnewaddress(), 1.0)
+        payment_txid = self.nodes[1].sendtoaddress(self.nodes[0].getnewaddress(), 1.0)
         self.sync_all()
 
-        # now we should receive a zmq msg because the tx was broadcast
-        msg = self.zmqSubSocket.recv_multipart()
-        topic = msg[0]
-        body = msg[1]
-        assert_equal(topic, b"hashtx")
-        hashZMQ = bytes_to_hex_str(body)
-        msgSequence = struct.unpack('<I', msg[-1])[-1]
-        assert_equal(msgSequence, blockcount + 1)
+        # Should receive the broadcasted txid.
+        txid = self.hashtx.receive()
+        assert_equal(payment_txid, bytes_to_hex_str(txid))
 
-        assert_equal(hashRPC, hashZMQ)  # txid from sendtoaddress must be equal to the hash received over zmq
+        # Should receive the broadcasted raw transaction.
+        hex = self.rawtx.receive()
+        assert_equal(payment_txid, bytes_to_hex_str(hash256(hex)))
 
 if __name__ == '__main__':
     ZMQTest().main()
diff --git a/test/util/bitcoin-util-test.py b/test/util/bitcoin-util-test.py
index d15d6a601..ef34955d9 100755
--- a/test/util/bitcoin-util-test.py
+++ b/test/util/bitcoin-util-test.py
@@ -9,9 +9,14 @@
 
 Can also be run manually."""
 
+from __future__ import division,print_function,unicode_literals
+
 import argparse
 import binascii
-import configparser
+try:
+    import configparser
+except ImportError:
+    import ConfigParser as configparser
 import difflib
 import json
 import logging
@@ -22,7 +27,9 @@
 
 def main():
     config = configparser.ConfigParser()
-    config.read_file(open(os.path.dirname(__file__) + "/../config.ini"))
+    config.optionxform = str
+    config.readfp(open(os.path.join(os.path.dirname(__file__), "../config.ini")))
+    env_conf = dict(config.items('environment'))
 
     parser = argparse.ArgumentParser(description=__doc__)
     parser.add_argument('-v', '--verbose', action='store_true')
@@ -37,7 +44,7 @@ def main():
     # Add the format/level to the logger
     logging.basicConfig(format=formatter, level=level)
 
-    bctester(config["environment"]["SRCDIR"] + "/test/util/data", "bitcoin-util-test.json", config["environment"])
+    bctester(os.path.join(env_conf["SRCDIR"], "test/util/data"), "bitcoin-util-test.json", env_conf)
 
 def bctester(testDir, input_basename, buildenv):
     """ Loads and parses the input file, runs all tests and reports results"""
diff --git a/test/util/data/bitcoin-util-test.json b/test/util/data/bitcoin-util-test.json
index b61a4f7f8..89b28bba6 100644
--- a/test/util/data/bitcoin-util-test.json
+++ b/test/util/data/bitcoin-util-test.json
@@ -261,6 +261,13 @@
     "output_cmp": "txcreateoutpubkey3.json",
     "description": "Creates a new transaction with a single pay-to-pub-key output, wrapped in P2SH (output as json)"
   },
+  { "exec": "./bitcoin-tx",
+    "args":
+    ["-json", "-create", "outpubkey=0:047d1368ba7ae01c94bc32293efd70bd7e3be7aa7912d07d0b1c659c1008d179b8642f5fb90f47580feb29f045e216ff5a4716d3a0fed36da414d332046303c44a:WS", "nversion=1"],
+    "return_code": 1,
+    "error_txt": "error: Uncompressed pubkeys are not useable for SegWit outputs",
+    "description": "Creates a new transaction with a single pay-to-pub-key output, wrapped in P2SH (output as json)"
+  },
   { "exec": "./bitcoin-tx",
     "args":
     ["-create",
@@ -388,5 +395,16 @@
     "args": ["-json", "-create", "outmultisig=1:2:3:02a5613bd857b7048924264d1e70e08fb2a7e6527d32b7ab1bb993ac59964ff397:021ac43c7ff740014c3b33737ede99c967e4764553d1b2b83db77c83b8715fa72d:02df2089105c77f266fa11a9d33f05c735234075f2e8780824c6b709415f9fb485:WS", "nversion=1"],
     "output_cmp": "txcreatemultisig4.json",
     "description": "Creates a new transaction with a single 2-of-3 multisig in a P2WSH output, wrapped in P2SH (output in json)"
+  },
+  { "exec": "./bitcoin-tx",
+    "args": ["-json", "-create", "outmultisig=1:2:3:02a5613bd857b7048924264d1e70e08fb2a7e6527d32b7ab1bb993ac59964ff397:021ac43c7ff740014c3b33737ede99c967e4764553d1b2b83db77c83b8715fa72d:047d1368ba7ae01c94bc32293efd70bd7e3be7aa7912d07d0b1c659c1008d179b8642f5fb90f47580feb29f045e216ff5a4716d3a0fed36da414d332046303c44a:S"],
+    "output_cmp": "txcreatemultisig5.json",
+    "description": "Uncompressed pubkeys should work just fine for non-witness outputs"
+  },
+  { "exec": "./bitcoin-tx",
+    "args": ["-json", "-create", "outmultisig=1:2:3:02a5613bd857b7048924264d1e70e08fb2a7e6527d32b7ab1bb993ac59964ff397:021ac43c7ff740014c3b33737ede99c967e4764553d1b2b83db77c83b8715fa72d:047d1368ba7ae01c94bc32293efd70bd7e3be7aa7912d07d0b1c659c1008d179b8642f5fb90f47580feb29f045e216ff5a4716d3a0fed36da414d332046303c44a:WS"],
+    "return_code": 1,
+    "error_txt": "error: Uncompressed pubkeys are not useable for SegWit outputs",
+    "description": "Ensure adding witness outputs with uncompressed pubkeys fails"
   }
 ]
diff --git a/test/util/data/tt-delin1-out.json b/test/util/data/tt-delin1-out.json
index 0b3235dd4..de647f98b 100644
--- a/test/util/data/tt-delin1-out.json
+++ b/test/util/data/tt-delin1-out.json
@@ -14,7 +14,7 @@
                 "hex": "493046022100b4251ecd63778a3dde0155abe4cd162947620ae9ee45a874353551092325b116022100db307baf4ff3781ec520bd18f387948cedd15dc27bafe17c894b0fe6ffffcafa012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "752f7f69b915637dc1c2f7aed1466ad676f6f3e24cf922809705f664e97ab3c1",
             "vout": 1,
@@ -23,7 +23,7 @@
                 "hex": "473044022079bd62ee09621a3be96b760c39e8ef78170101d46313923c6b07ae60a95c90670220238e51ea29fc70b04b65508450523caedbb11cb4dd5aa608c81487de798925ba0121027a759be8df971a6a04fafcb4f6babf75dc811c5cdaa0734cddbe9b942ce75b34"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "b0ac9cca2e69cd02410e31b1f4402a25758e71abd1ab06c265ef9077dc05d0ed",
             "vout": 209,
@@ -32,7 +32,7 @@
                 "hex": "48304502207722d6f9038673c86a1019b1c4de2d687ae246477cd4ca7002762be0299de385022100e594a11e3a313942595f7666dcf7078bcb14f1330f4206b95c917e7ec0e82fac012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "a135eafb595eaf4c1ea59ccb111cdc0eae1b2c979b226a1e5aa8b76fe2d628df",
             "vout": 0,
@@ -41,7 +41,7 @@
                 "hex": "483045022100a63a4788027b79b65c6f9d9e054f68cf3b4eed19efd82a2d53f70dcbe64683390220526f243671425b2bd05745fcf2729361f985cfe84ea80c7cfc817b93d8134374012103a621f08be22d1bbdcbe4e527ee4927006aa555fc65e2aafa767d4ea2fe9dfa52"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "a5d6bf53ba21140b8a4d554feb00fe8bb9a62430ff9e4624aa2f58a120232aae",
             "vout": 1,
@@ -50,7 +50,7 @@
                 "hex": "493046022100b200ac6db16842f76dab9abe807ce423c992805879bc50abd46ed8275a59d9cf022100c0d518e85dd345b3c29dd4dc47b9a420d3ce817b18720e94966d2fe23413a408012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "1b299cf14f1a22e81ea56d71b7affbd7cf386807bf2b4d4b79a18a54125accb3",
             "vout": 0,
@@ -59,7 +59,7 @@
                 "hex": "483045022100ededc441c3103a6f2bd6cab7639421af0f6ec5e60503bce1e603cf34f00aee1c02205cb75f3f519a13fb348783b21db3085cb5ec7552c59e394fdbc3e1feea43f967012103a621f08be22d1bbdcbe4e527ee4927006aa555fc65e2aafa767d4ea2fe9dfa52"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "071df1cdcb3f0070f9d6af7b0274f02d0be2324a274727cfd288383167531485",
             "vout": 21,
@@ -68,7 +68,7 @@
                 "hex": "483045022100d9eed5413d2a4b4b98625aa6e3169edc4fb4663e7862316d69224454e70cd8ca022061e506521d5ced51dd0ea36496e75904d756a4c4f9fb111568555075d5f68d9a012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "b012e500eb7adf7a13ed332dd6ece849f94f7a62bb3eac5babab356d1fc19282",
             "vout": 9,
@@ -77,7 +77,7 @@
                 "hex": "48304502207e84b27139c4c19c828cb1e30c349bba88e4d9b59be97286960793b5ddc0a2af0221008cdc7a951e7f31c20953ed5635fbabf228e80b7047f32faaa0313e7693005177012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "58840fee9c833f2f2d40575842f30f4b8d2553094d06ad88b03d06869acf3d88",
             "vout": 30,
@@ -86,7 +86,7 @@
                 "hex": "4730440220426540dfed9c4ab5812e5f06df705b8bcf307dd7d20f7fa6512298b2a6314f420220064055096e3ca62f6c7352c66a5447767c53f946acdf35025ab3807ddb2fa404012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "e69f9cd16946e570a665245354428a3f507ea69f4568b581e4af98edb3db9766",
             "vout": 114,
@@ -95,7 +95,7 @@
                 "hex": "47304402200a5e673996f2fc88e21cc8613611f08a650bc0370338803591d85d0ec5663764022040b6664a0d1ec83a7f01975b8fde5232992b8ca58bf48af6725d2f92a936ab2e012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "595d1257f654ed2cbe5a65421e8aefd2b4d70b5b6c89a03f1d7e518221fc3f02",
             "vout": 103,
@@ -104,7 +104,7 @@
                 "hex": "493046022100d93b30219c5735f673be5c3b4688366d96f545561c74cb62c6958c00f6960806022100ec8200adcb028f2184fa2a4f6faac7f8bb57cb4503bb7584ac11051fece31b3d012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "06fc818f9555a261248ecd7aad0993eafb5a82ceb2b5c87c3ddfb06671c7f816",
             "vout": 1,
@@ -113,7 +113,7 @@
                 "hex": "483045022100a13934e68d3f5b22b130c4cb33f4da468cffc52323a47fbfbe06b64858162246022047081e0a70ff770e64a2e2d31e5d520d9102268b57a47009a72fe73ec766901801210234b9d9413f247bb78cd3293b7b65a2c38018ba5621ea9ee737f3a6a3523fb4cd"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "fb416c8155d6bb1d43f9395466ca90a638a7c2dd3ff617aadf3a7ac8f3967b19",
             "vout": 0,
@@ -122,7 +122,7 @@
                 "hex": "49304602210097f1f35d5bdc1a3a60390a1b015b8e7c4f916aa3847aafd969e04975e15bbe70022100a9052eb25517d481f1fda1b129eb1b534da50ea1a51f3ee012dca3601c11b86a0121027a759be8df971a6a04fafcb4f6babf75dc811c5cdaa0734cddbe9b942ce75b34"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "3940b9683bd6104ad24c978e640ba4095993cafdb27d2ed91baa27ee61a2d920",
             "vout": 221,
@@ -131,7 +131,7 @@
                 "hex": "483045022012b3138c591bf7154b6fef457f2c4a3c7162225003788ac0024a99355865ff13022100b71b125ae1ffb2e1d1571f580cd3ebc8cd049a2d7a8a41f138ba94aeb982106f012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "711b5714d3b5136147c02194cd95bde94a4648c4263ca6f972d86cd1d579f150",
             "vout": 1,
@@ -140,7 +140,7 @@
                 "hex": "483045022100f834ccc8b22ee72712a3e5e6ef4acb8b2fb791b5385b70e2cd4332674d6667f4022024fbda0a997e0c253503f217501f508a4d56edce2c813ecdd9ad796dbeba907401210234b9d9413f247bb78cd3293b7b65a2c38018ba5621ea9ee737f3a6a3523fb4cd"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "6364b5c5efe018430789e7fb4e338209546cae5d9c5f5e300aac68155d861b55",
             "vout": 27,
@@ -149,7 +149,7 @@
                 "hex": "48304502203b2fd1e39ae0e469d7a15768f262661b0de41470daf0fe8c4fd0c26542a0870002210081c57e331f9a2d214457d953e3542904727ee412c63028113635d7224da3dccc012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "0bb57f6e38012c86d4c5a28c904f2675082859147921a707d48961015a3e5057",
             "vout": 1095,
@@ -158,7 +158,7 @@
                 "hex": "48304502206947a9c54f0664ece4430fd4ae999891dc50bb6126bc36b6a15a3189f29d25e9022100a86cfc4e2fdd9e39a20e305cfd1b76509c67b3e313e0f118229105caa0e823c9012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "9b34274814a2540bb062107117f8f3e75ef85d953e9372d8261a3e9dfbc1163f",
             "vout": 37,
@@ -167,7 +167,7 @@
                 "hex": "483045022100c7128fe10b2d38744ae8177776054c29fc8ec13f07207723e70766ab7164847402201d2cf09009b9596de74c0183d1ab832e5edddb7a9965880bb400097e850850f8012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "b86b5cc0d8a7374d94e277850b0a249cb26a7b42ddf014f28a49b8859da64241",
             "vout": 20,
@@ -176,7 +176,7 @@
                 "hex": "48304502203b89a71628a28cc3703d170ca3be77786cff6b867e38a18b719705f8a326578f022100b2a9879e1acf621faa6466c207746a7f3eb4c8514c1482969aba3f2a957f1321012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "3d0a2353eeec44d3c10aed259038db321912122cd4150048f7bfa4c0ecfee236",
             "vout": 242,
@@ -200,7 +200,7 @@
                     "1E7SGgAZFCHDnVZLuRViX3gUmxpMfdvd2o"
                 ]
             }
-        }, 
+        },
         {
             "value": 0.01000001,
             "n": 1,
diff --git a/test/util/data/tt-delout1-out.json b/test/util/data/tt-delout1-out.json
index 5b69d0cd8..067ffe74e 100644
--- a/test/util/data/tt-delout1-out.json
+++ b/test/util/data/tt-delout1-out.json
@@ -14,7 +14,7 @@
                 "hex": "493046022100b4251ecd63778a3dde0155abe4cd162947620ae9ee45a874353551092325b116022100db307baf4ff3781ec520bd18f387948cedd15dc27bafe17c894b0fe6ffffcafa012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "a72ec96bd0d022d1b0c2f9078cdd46b3725b8eecdd001e17b21e3ababad14ecb",
             "vout": 0,
@@ -23,7 +23,7 @@
                 "hex": "493046022100a9b617843b68c284715d3e02fd120479cd0d96a6c43bf01e697fb0a460a21a3a022100ba0a12fbe8b993d4e7911fa3467615765dbe421ddf5c51b57a9c1ee19dcc00ba012103e633b4fa4ceb705c2da712390767199be8ef2448b3095dc01652e11b2b751505"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "752f7f69b915637dc1c2f7aed1466ad676f6f3e24cf922809705f664e97ab3c1",
             "vout": 1,
@@ -32,7 +32,7 @@
                 "hex": "473044022079bd62ee09621a3be96b760c39e8ef78170101d46313923c6b07ae60a95c90670220238e51ea29fc70b04b65508450523caedbb11cb4dd5aa608c81487de798925ba0121027a759be8df971a6a04fafcb4f6babf75dc811c5cdaa0734cddbe9b942ce75b34"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "b0ac9cca2e69cd02410e31b1f4402a25758e71abd1ab06c265ef9077dc05d0ed",
             "vout": 209,
@@ -41,7 +41,7 @@
                 "hex": "48304502207722d6f9038673c86a1019b1c4de2d687ae246477cd4ca7002762be0299de385022100e594a11e3a313942595f7666dcf7078bcb14f1330f4206b95c917e7ec0e82fac012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "a135eafb595eaf4c1ea59ccb111cdc0eae1b2c979b226a1e5aa8b76fe2d628df",
             "vout": 0,
@@ -50,7 +50,7 @@
                 "hex": "483045022100a63a4788027b79b65c6f9d9e054f68cf3b4eed19efd82a2d53f70dcbe64683390220526f243671425b2bd05745fcf2729361f985cfe84ea80c7cfc817b93d8134374012103a621f08be22d1bbdcbe4e527ee4927006aa555fc65e2aafa767d4ea2fe9dfa52"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "a5d6bf53ba21140b8a4d554feb00fe8bb9a62430ff9e4624aa2f58a120232aae",
             "vout": 1,
@@ -59,7 +59,7 @@
                 "hex": "493046022100b200ac6db16842f76dab9abe807ce423c992805879bc50abd46ed8275a59d9cf022100c0d518e85dd345b3c29dd4dc47b9a420d3ce817b18720e94966d2fe23413a408012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "1b299cf14f1a22e81ea56d71b7affbd7cf386807bf2b4d4b79a18a54125accb3",
             "vout": 0,
@@ -68,7 +68,7 @@
                 "hex": "483045022100ededc441c3103a6f2bd6cab7639421af0f6ec5e60503bce1e603cf34f00aee1c02205cb75f3f519a13fb348783b21db3085cb5ec7552c59e394fdbc3e1feea43f967012103a621f08be22d1bbdcbe4e527ee4927006aa555fc65e2aafa767d4ea2fe9dfa52"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "071df1cdcb3f0070f9d6af7b0274f02d0be2324a274727cfd288383167531485",
             "vout": 21,
@@ -77,7 +77,7 @@
                 "hex": "483045022100d9eed5413d2a4b4b98625aa6e3169edc4fb4663e7862316d69224454e70cd8ca022061e506521d5ced51dd0ea36496e75904d756a4c4f9fb111568555075d5f68d9a012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "b012e500eb7adf7a13ed332dd6ece849f94f7a62bb3eac5babab356d1fc19282",
             "vout": 9,
@@ -86,7 +86,7 @@
                 "hex": "48304502207e84b27139c4c19c828cb1e30c349bba88e4d9b59be97286960793b5ddc0a2af0221008cdc7a951e7f31c20953ed5635fbabf228e80b7047f32faaa0313e7693005177012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "58840fee9c833f2f2d40575842f30f4b8d2553094d06ad88b03d06869acf3d88",
             "vout": 30,
@@ -95,7 +95,7 @@
                 "hex": "4730440220426540dfed9c4ab5812e5f06df705b8bcf307dd7d20f7fa6512298b2a6314f420220064055096e3ca62f6c7352c66a5447767c53f946acdf35025ab3807ddb2fa404012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "e69f9cd16946e570a665245354428a3f507ea69f4568b581e4af98edb3db9766",
             "vout": 114,
@@ -104,7 +104,7 @@
                 "hex": "47304402200a5e673996f2fc88e21cc8613611f08a650bc0370338803591d85d0ec5663764022040b6664a0d1ec83a7f01975b8fde5232992b8ca58bf48af6725d2f92a936ab2e012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "595d1257f654ed2cbe5a65421e8aefd2b4d70b5b6c89a03f1d7e518221fc3f02",
             "vout": 103,
@@ -113,7 +113,7 @@
                 "hex": "493046022100d93b30219c5735f673be5c3b4688366d96f545561c74cb62c6958c00f6960806022100ec8200adcb028f2184fa2a4f6faac7f8bb57cb4503bb7584ac11051fece31b3d012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "06fc818f9555a261248ecd7aad0993eafb5a82ceb2b5c87c3ddfb06671c7f816",
             "vout": 1,
@@ -122,7 +122,7 @@
                 "hex": "483045022100a13934e68d3f5b22b130c4cb33f4da468cffc52323a47fbfbe06b64858162246022047081e0a70ff770e64a2e2d31e5d520d9102268b57a47009a72fe73ec766901801210234b9d9413f247bb78cd3293b7b65a2c38018ba5621ea9ee737f3a6a3523fb4cd"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "fb416c8155d6bb1d43f9395466ca90a638a7c2dd3ff617aadf3a7ac8f3967b19",
             "vout": 0,
@@ -131,7 +131,7 @@
                 "hex": "49304602210097f1f35d5bdc1a3a60390a1b015b8e7c4f916aa3847aafd969e04975e15bbe70022100a9052eb25517d481f1fda1b129eb1b534da50ea1a51f3ee012dca3601c11b86a0121027a759be8df971a6a04fafcb4f6babf75dc811c5cdaa0734cddbe9b942ce75b34"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "3940b9683bd6104ad24c978e640ba4095993cafdb27d2ed91baa27ee61a2d920",
             "vout": 221,
@@ -140,7 +140,7 @@
                 "hex": "483045022012b3138c591bf7154b6fef457f2c4a3c7162225003788ac0024a99355865ff13022100b71b125ae1ffb2e1d1571f580cd3ebc8cd049a2d7a8a41f138ba94aeb982106f012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "711b5714d3b5136147c02194cd95bde94a4648c4263ca6f972d86cd1d579f150",
             "vout": 1,
@@ -149,7 +149,7 @@
                 "hex": "483045022100f834ccc8b22ee72712a3e5e6ef4acb8b2fb791b5385b70e2cd4332674d6667f4022024fbda0a997e0c253503f217501f508a4d56edce2c813ecdd9ad796dbeba907401210234b9d9413f247bb78cd3293b7b65a2c38018ba5621ea9ee737f3a6a3523fb4cd"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "6364b5c5efe018430789e7fb4e338209546cae5d9c5f5e300aac68155d861b55",
             "vout": 27,
@@ -158,7 +158,7 @@
                 "hex": "48304502203b2fd1e39ae0e469d7a15768f262661b0de41470daf0fe8c4fd0c26542a0870002210081c57e331f9a2d214457d953e3542904727ee412c63028113635d7224da3dccc012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "0bb57f6e38012c86d4c5a28c904f2675082859147921a707d48961015a3e5057",
             "vout": 1095,
@@ -167,7 +167,7 @@
                 "hex": "48304502206947a9c54f0664ece4430fd4ae999891dc50bb6126bc36b6a15a3189f29d25e9022100a86cfc4e2fdd9e39a20e305cfd1b76509c67b3e313e0f118229105caa0e823c9012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "9b34274814a2540bb062107117f8f3e75ef85d953e9372d8261a3e9dfbc1163f",
             "vout": 37,
@@ -176,7 +176,7 @@
                 "hex": "483045022100c7128fe10b2d38744ae8177776054c29fc8ec13f07207723e70766ab7164847402201d2cf09009b9596de74c0183d1ab832e5edddb7a9965880bb400097e850850f8012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "b86b5cc0d8a7374d94e277850b0a249cb26a7b42ddf014f28a49b8859da64241",
             "vout": 20,
@@ -185,7 +185,7 @@
                 "hex": "48304502203b89a71628a28cc3703d170ca3be77786cff6b867e38a18b719705f8a326578f022100b2a9879e1acf621faa6466c207746a7f3eb4c8514c1482969aba3f2a957f1321012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "3d0a2353eeec44d3c10aed259038db321912122cd4150048f7bfa4c0ecfee236",
             "vout": 242,
diff --git a/test/util/data/tt-locktime317000-out.json b/test/util/data/tt-locktime317000-out.json
index cf1ebcdf3..af7903d1d 100644
--- a/test/util/data/tt-locktime317000-out.json
+++ b/test/util/data/tt-locktime317000-out.json
@@ -14,7 +14,7 @@
                 "hex": "493046022100b4251ecd63778a3dde0155abe4cd162947620ae9ee45a874353551092325b116022100db307baf4ff3781ec520bd18f387948cedd15dc27bafe17c894b0fe6ffffcafa012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "a72ec96bd0d022d1b0c2f9078cdd46b3725b8eecdd001e17b21e3ababad14ecb",
             "vout": 0,
@@ -23,7 +23,7 @@
                 "hex": "493046022100a9b617843b68c284715d3e02fd120479cd0d96a6c43bf01e697fb0a460a21a3a022100ba0a12fbe8b993d4e7911fa3467615765dbe421ddf5c51b57a9c1ee19dcc00ba012103e633b4fa4ceb705c2da712390767199be8ef2448b3095dc01652e11b2b751505"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "752f7f69b915637dc1c2f7aed1466ad676f6f3e24cf922809705f664e97ab3c1",
             "vout": 1,
@@ -32,7 +32,7 @@
                 "hex": "473044022079bd62ee09621a3be96b760c39e8ef78170101d46313923c6b07ae60a95c90670220238e51ea29fc70b04b65508450523caedbb11cb4dd5aa608c81487de798925ba0121027a759be8df971a6a04fafcb4f6babf75dc811c5cdaa0734cddbe9b942ce75b34"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "b0ac9cca2e69cd02410e31b1f4402a25758e71abd1ab06c265ef9077dc05d0ed",
             "vout": 209,
@@ -41,7 +41,7 @@
                 "hex": "48304502207722d6f9038673c86a1019b1c4de2d687ae246477cd4ca7002762be0299de385022100e594a11e3a313942595f7666dcf7078bcb14f1330f4206b95c917e7ec0e82fac012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "a135eafb595eaf4c1ea59ccb111cdc0eae1b2c979b226a1e5aa8b76fe2d628df",
             "vout": 0,
@@ -50,7 +50,7 @@
                 "hex": "483045022100a63a4788027b79b65c6f9d9e054f68cf3b4eed19efd82a2d53f70dcbe64683390220526f243671425b2bd05745fcf2729361f985cfe84ea80c7cfc817b93d8134374012103a621f08be22d1bbdcbe4e527ee4927006aa555fc65e2aafa767d4ea2fe9dfa52"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "a5d6bf53ba21140b8a4d554feb00fe8bb9a62430ff9e4624aa2f58a120232aae",
             "vout": 1,
@@ -59,7 +59,7 @@
                 "hex": "493046022100b200ac6db16842f76dab9abe807ce423c992805879bc50abd46ed8275a59d9cf022100c0d518e85dd345b3c29dd4dc47b9a420d3ce817b18720e94966d2fe23413a408012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "1b299cf14f1a22e81ea56d71b7affbd7cf386807bf2b4d4b79a18a54125accb3",
             "vout": 0,
@@ -68,7 +68,7 @@
                 "hex": "483045022100ededc441c3103a6f2bd6cab7639421af0f6ec5e60503bce1e603cf34f00aee1c02205cb75f3f519a13fb348783b21db3085cb5ec7552c59e394fdbc3e1feea43f967012103a621f08be22d1bbdcbe4e527ee4927006aa555fc65e2aafa767d4ea2fe9dfa52"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "071df1cdcb3f0070f9d6af7b0274f02d0be2324a274727cfd288383167531485",
             "vout": 21,
@@ -77,7 +77,7 @@
                 "hex": "483045022100d9eed5413d2a4b4b98625aa6e3169edc4fb4663e7862316d69224454e70cd8ca022061e506521d5ced51dd0ea36496e75904d756a4c4f9fb111568555075d5f68d9a012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "b012e500eb7adf7a13ed332dd6ece849f94f7a62bb3eac5babab356d1fc19282",
             "vout": 9,
@@ -86,7 +86,7 @@
                 "hex": "48304502207e84b27139c4c19c828cb1e30c349bba88e4d9b59be97286960793b5ddc0a2af0221008cdc7a951e7f31c20953ed5635fbabf228e80b7047f32faaa0313e7693005177012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "58840fee9c833f2f2d40575842f30f4b8d2553094d06ad88b03d06869acf3d88",
             "vout": 30,
@@ -95,7 +95,7 @@
                 "hex": "4730440220426540dfed9c4ab5812e5f06df705b8bcf307dd7d20f7fa6512298b2a6314f420220064055096e3ca62f6c7352c66a5447767c53f946acdf35025ab3807ddb2fa404012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "e69f9cd16946e570a665245354428a3f507ea69f4568b581e4af98edb3db9766",
             "vout": 114,
@@ -104,7 +104,7 @@
                 "hex": "47304402200a5e673996f2fc88e21cc8613611f08a650bc0370338803591d85d0ec5663764022040b6664a0d1ec83a7f01975b8fde5232992b8ca58bf48af6725d2f92a936ab2e012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "595d1257f654ed2cbe5a65421e8aefd2b4d70b5b6c89a03f1d7e518221fc3f02",
             "vout": 103,
@@ -113,7 +113,7 @@
                 "hex": "493046022100d93b30219c5735f673be5c3b4688366d96f545561c74cb62c6958c00f6960806022100ec8200adcb028f2184fa2a4f6faac7f8bb57cb4503bb7584ac11051fece31b3d012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "06fc818f9555a261248ecd7aad0993eafb5a82ceb2b5c87c3ddfb06671c7f816",
             "vout": 1,
@@ -122,7 +122,7 @@
                 "hex": "483045022100a13934e68d3f5b22b130c4cb33f4da468cffc52323a47fbfbe06b64858162246022047081e0a70ff770e64a2e2d31e5d520d9102268b57a47009a72fe73ec766901801210234b9d9413f247bb78cd3293b7b65a2c38018ba5621ea9ee737f3a6a3523fb4cd"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "fb416c8155d6bb1d43f9395466ca90a638a7c2dd3ff617aadf3a7ac8f3967b19",
             "vout": 0,
@@ -131,7 +131,7 @@
                 "hex": "49304602210097f1f35d5bdc1a3a60390a1b015b8e7c4f916aa3847aafd969e04975e15bbe70022100a9052eb25517d481f1fda1b129eb1b534da50ea1a51f3ee012dca3601c11b86a0121027a759be8df971a6a04fafcb4f6babf75dc811c5cdaa0734cddbe9b942ce75b34"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "3940b9683bd6104ad24c978e640ba4095993cafdb27d2ed91baa27ee61a2d920",
             "vout": 221,
@@ -140,7 +140,7 @@
                 "hex": "483045022012b3138c591bf7154b6fef457f2c4a3c7162225003788ac0024a99355865ff13022100b71b125ae1ffb2e1d1571f580cd3ebc8cd049a2d7a8a41f138ba94aeb982106f012103091137f3ef23f4acfc19a5953a68b2074fae942ad3563ef28c33b0cac9a93adc"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "711b5714d3b5136147c02194cd95bde94a4648c4263ca6f972d86cd1d579f150",
             "vout": 1,
@@ -149,7 +149,7 @@
                 "hex": "483045022100f834ccc8b22ee72712a3e5e6ef4acb8b2fb791b5385b70e2cd4332674d6667f4022024fbda0a997e0c253503f217501f508a4d56edce2c813ecdd9ad796dbeba907401210234b9d9413f247bb78cd3293b7b65a2c38018ba5621ea9ee737f3a6a3523fb4cd"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "6364b5c5efe018430789e7fb4e338209546cae5d9c5f5e300aac68155d861b55",
             "vout": 27,
@@ -158,7 +158,7 @@
                 "hex": "48304502203b2fd1e39ae0e469d7a15768f262661b0de41470daf0fe8c4fd0c26542a0870002210081c57e331f9a2d214457d953e3542904727ee412c63028113635d7224da3dccc012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "0bb57f6e38012c86d4c5a28c904f2675082859147921a707d48961015a3e5057",
             "vout": 1095,
@@ -167,7 +167,7 @@
                 "hex": "48304502206947a9c54f0664ece4430fd4ae999891dc50bb6126bc36b6a15a3189f29d25e9022100a86cfc4e2fdd9e39a20e305cfd1b76509c67b3e313e0f118229105caa0e823c9012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "9b34274814a2540bb062107117f8f3e75ef85d953e9372d8261a3e9dfbc1163f",
             "vout": 37,
@@ -176,7 +176,7 @@
                 "hex": "483045022100c7128fe10b2d38744ae8177776054c29fc8ec13f07207723e70766ab7164847402201d2cf09009b9596de74c0183d1ab832e5edddb7a9965880bb400097e850850f8012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "b86b5cc0d8a7374d94e277850b0a249cb26a7b42ddf014f28a49b8859da64241",
             "vout": 20,
@@ -185,7 +185,7 @@
                 "hex": "48304502203b89a71628a28cc3703d170ca3be77786cff6b867e38a18b719705f8a326578f022100b2a9879e1acf621faa6466c207746a7f3eb4c8514c1482969aba3f2a957f1321012103f1575d6124ac78be398c25b31146d08313c6072d23a4d7df5ac6a9f87346c64c"
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "3d0a2353eeec44d3c10aed259038db321912122cd4150048f7bfa4c0ecfee236",
             "vout": 242,
@@ -209,7 +209,7 @@
                     "1E7SGgAZFCHDnVZLuRViX3gUmxpMfdvd2o"
                 ]
             }
-        }, 
+        },
         {
             "value": 0.01000001,
             "n": 1,
diff --git a/test/util/data/txcreate1.json b/test/util/data/txcreate1.json
index edb091f94..83a86649e 100644
--- a/test/util/data/txcreate1.json
+++ b/test/util/data/txcreate1.json
@@ -14,7 +14,7 @@
                 "hex": ""
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "bf829c6bcf84579331337659d31f89dfd138f7f7785802d5501c92333145ca7c",
             "vout": 18,
@@ -23,7 +23,7 @@
                 "hex": ""
             },
             "sequence": 4294967295
-        }, 
+        },
         {
             "txid": "22a6f904655d53ae2ff70e701a0bbd90aa3975c0f40bfc6cc996a9049e31cdfc",
             "vout": 1,
@@ -47,7 +47,7 @@
                     "13tuJJDR2RgArmgfv6JScSdreahzgc4T6o"
                 ]
             }
-        }, 
+        },
         {
             "value": 4.00000000,
             "n": 1,
diff --git a/test/util/data/txcreatedata1.json b/test/util/data/txcreatedata1.json
index e66a6bb9a..15a4246ae 100644
--- a/test/util/data/txcreatedata1.json
+++ b/test/util/data/txcreatedata1.json
@@ -29,7 +29,7 @@
                     "13tuJJDR2RgArmgfv6JScSdreahzgc4T6o"
                 ]
             }
-        }, 
+        },
         {
             "value": 4.00000000,
             "n": 1,
diff --git a/test/util/data/txcreatedata2.json b/test/util/data/txcreatedata2.json
index 0f8edcafd..cb93c2797 100644
--- a/test/util/data/txcreatedata2.json
+++ b/test/util/data/txcreatedata2.json
@@ -29,7 +29,7 @@
                     "13tuJJDR2RgArmgfv6JScSdreahzgc4T6o"
                 ]
             }
-        }, 
+        },
         {
             "value": 0.00000000,
             "n": 1,
diff --git a/test/util/data/txcreatedata_seq1.json b/test/util/data/txcreatedata_seq1.json
index 771ff1bb1..dea48ba37 100644
--- a/test/util/data/txcreatedata_seq1.json
+++ b/test/util/data/txcreatedata_seq1.json
@@ -14,7 +14,7 @@
                 "hex": ""
             },
             "sequence": 4294967293
-        }, 
+        },
         {
             "txid": "5897de6bd6027a475eadd57019d4e6872c396d0716c4875a5f1a6fcfdf385c1f",
             "vout": 0,
diff --git a/test/util/data/txcreatemultisig1.json b/test/util/data/txcreatemultisig1.json
index 7c814dad8..72e20c869 100644
--- a/test/util/data/txcreatemultisig1.json
+++ b/test/util/data/txcreatemultisig1.json
@@ -17,8 +17,8 @@
                 "reqSigs": 2,
                 "type": "multisig",
                 "addresses": [
-                    "1FoG2386FG2tAJS9acMuiDsKy67aGg9MKz", 
-                    "1FXtz9KU8JNmQDyHdiEm5HDiALuP3zdHvV", 
+                    "1FoG2386FG2tAJS9acMuiDsKy67aGg9MKz",
+                    "1FXtz9KU8JNmQDyHdiEm5HDiALuP3zdHvV",
                     "14LuavcBbXZYJ6Tsz3cAUQj9SuQoL2xCQX"
                 ]
             }
diff --git a/test/util/data/txcreatemultisig3.json b/test/util/data/txcreatemultisig3.json
index 06e093e22..6c5b49d87 100644
--- a/test/util/data/txcreatemultisig3.json
+++ b/test/util/data/txcreatemultisig3.json
@@ -14,7 +14,11 @@
             "scriptPubKey": {
                 "asm": "0 e15a86a23178f433d514dbbce042e87d72662b8b5edcacfd2e37ab7a2d135f05",
                 "hex": "0020e15a86a23178f433d514dbbce042e87d72662b8b5edcacfd2e37ab7a2d135f05",
-                "type": "witness_v0_scripthash"
+                "reqSigs": 1,
+                "type": "witness_v0_scripthash",
+                "addresses": [
+                    "bc1qu9dgdg330r6r84g5mw7wqshg04exv2uttmw2elfwx74h5tgntuzs44gyfg"
+                ]
             }
         }
     ],
diff --git a/test/util/data/txcreatemultisig5.json b/test/util/data/txcreatemultisig5.json
new file mode 100644
index 000000000..20e9bb077
--- /dev/null
+++ b/test/util/data/txcreatemultisig5.json
@@ -0,0 +1,26 @@
+{
+    "txid": "813cf75e1f08debd242ef7c8192b7d478fb651355209369499a0de779ba7eb2f",
+    "hash": "813cf75e1f08debd242ef7c8192b7d478fb651355209369499a0de779ba7eb2f",
+    "version": 2,
+    "size": 42,
+    "vsize": 42,
+    "locktime": 0,
+    "vin": [
+    ],
+    "vout": [
+        {
+            "value": 1.00000000,
+            "n": 0,
+            "scriptPubKey": {
+                "asm": "OP_HASH160 a4051c02398868af83f28f083208fae99a769263 OP_EQUAL",
+                "hex": "a914a4051c02398868af83f28f083208fae99a76926387",
+                "reqSigs": 1,
+                "type": "scripthash",
+                "addresses": [
+                    "3GeGs1eHUxPz5YyuFe9WPpXid2UsUb5Jos"
+                ]
+            }
+        }
+    ],
+    "hex": "02000000000100e1f5050000000017a914a4051c02398868af83f28f083208fae99a7692638700000000"
+}
diff --git a/test/util/data/txcreateoutpubkey2.json b/test/util/data/txcreateoutpubkey2.json
index 514472223..4ba5dcb28 100644
--- a/test/util/data/txcreateoutpubkey2.json
+++ b/test/util/data/txcreateoutpubkey2.json
@@ -14,7 +14,11 @@
             "scriptPubKey": {
                 "asm": "0 a2516e770582864a6a56ed21a102044e388c62e3",
                 "hex": "0014a2516e770582864a6a56ed21a102044e388c62e3",
-                "type": "witness_v0_keyhash"
+                "reqSigs": 1,
+                "type": "witness_v0_keyhash",
+                "addresses": [
+                    "bc1q5fgkuac9s2ry56jka5s6zqsyfcugcchry5cwu0"
+                ]
             }
         }
     ],
diff --git a/test/util/data/txcreatescript3.json b/test/util/data/txcreatescript3.json
index 980da2fb3..31b645921 100644
--- a/test/util/data/txcreatescript3.json
+++ b/test/util/data/txcreatescript3.json
@@ -14,7 +14,11 @@
             "scriptPubKey": {
                 "asm": "0 0bfe935e70c321c7ca3afc75ce0d0ca2f98b5422e008bb31c00c6d7f1f1c0ad6",
                 "hex": "00200bfe935e70c321c7ca3afc75ce0d0ca2f98b5422e008bb31c00c6d7f1f1c0ad6",
-                "type": "witness_v0_scripthash"
+                "reqSigs": 1,
+                "type": "witness_v0_scripthash",
+                "addresses": [
+                    "bc1qp0lfxhnscvsu0j36l36uurgv5tuck4pzuqytkvwqp3kh78cupttqyf705v"
+                ]
             }
         }
     ],