abci/

README

Application BlockChain Interface (ABCI)

Blockchains are systems for multi-master state machine replication. ABCI is an interface that defines the boundary between the replication engine (the blockchain), and the state machine (the application). Using a socket protocol, a consensus engine running in one process can manage an application state running in another.

Application BlockChain Interface (ABCI)

Basically, see the Tendermint v0.34.20 ABCI spec.