Scriptless scripts is an approach to designing cryptographic protocol on top of Bitcoin which avoids execution of explicit smart contracts.

WARNING: Unless specified otherwise, the presented schemes are ad-hoc constructions and have no formal security model or security proof. They may miss crucial details, are outright insecure or seriously flawed in other ways.

• Adaptor Signatures and Atomic Swaps from Scriptless Scripts
  • This document describes adaptor signatures and multisignatures, which are the original building blocks of scriptless scripts. It also describes an atomic swap protocol using these building blocks.
• Partially Blind Atomic Swap Using Adaptor Signatures
  • In this scheme one of the participants of the swap does not learn which coins are being swapped.
• Atomic Pedersen Swap Using Adaptor Signatures
  • An atomic Pedersen swap exchanges a coin with the opening (r, x) of a Pedersen commitment r*G + x*H.
• Multi-Hop Locks from Scriptless Scripts
  • Multi-hop locks are protocols that allow two parties to exchange coins and proof of payment without requiring a mutual funding multisig output (also known as "Lightning with Scriptless Scripts").
• Non-Interactive Threshold Escrow (NITE)
  • NITE allows non-interactively setting up certain threshold policies on-chain, as well as off-chain if it is combined with multi-hop locks.
• Thresh Metr MuSig
  • This document discusses approaches to express THRESHold spending policies with MErkle TRees and MuSig.