libocr consists of a Go library and a set of Solidity smart contracts that implements various versions of the Chainlink Offchain Reporting Protocol, a Byzantine fault tolerant "consensus" protocol that allows a set of oracles to generate offchain an aggregate report of the oracles' observations of some underlying data source. This report is then transmitted to an onchain contract in a single transaction.

You may also be interested in libocr's integration into the actual Chainlink node. (V1 V2 V3)

Please see the whitepapers available at https://chainlinklabs.com/research for detailed protocol descriptions.

• OCR1 is deprecated and being phased out.
• OCR2 & OCR3 are in production.
• OCR3.1 is in alpha and excluded from any bug bounties at this time. So are the associated Key-Value-Database in offchainreporting2plus/keyvaluedatabase/ and helpers in internal/jmt, internal/randmap, internal/singlewriter.

├── bigbigendian: helper package
├── commontypes: shared type definitions
├── contract: OCR1 Ethereum contracts
├── contract2: OCR2 Ethereum contracts
├── contract3: OCR3 Ethereum contracts
├── gethwrappers: go-ethereum bindings for the OCR1 contracts, generated with abigen
├── gethwrappers2: go-ethereum bindings for the OCR2 contracts, generated with abigen
├── gethwrappers3: go-ethereum bindings for the OCR3 contracts, generated with abigen
├── networking: OCR networking layer
├── offchainreporting: OCR1
├── offchainreporting2: OCR2-specific
├── offchainreporting2plus: OCR2 and beyond (These versions share many interface definitions to make integration of new versions easier)
├── permutation: helper package
├── quorumhelper: helper package
├── ragep2p: p2p networking
└── subprocesses: helper package