ABCI stands for "Application Blockchain Interface".
ABCI is the interface between Tendermint (a state-machine replication engine)
and your application (the actual state machine). It consists of a set of
methods, each with a corresponding
To perform state-machine replication, Tendermint calls the ABCI methods on the
ABCI application by sending the
Request* messages and receiving the
Response* messages in return.
All ABCI messages and methods are defined in protocol buffers (opens new window). This allows Tendermint to run with applications written in many programming languages.
This specification is split as follows: