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CometBFT Protocol Buffers Definitions

This is the set of Protobuf definitions of types used by various parts of CometBFT:

  • The Application Blockchain Interface (ABCI), especially in the context of remote applications.
  • The P2P layer, in how CometBFT nodes interact with each other over the network.
  • In interaction with remote signers ("privval").
  • The RPC, in that the native JSON serialization of certain Protobuf types is used when accepting and responding to RPC requests.
  • The storage layer, in how data is serialized to and deserialized from on-disk storage.

The canonical Protobuf definitions live in the proto folder of the relevant release branch of CometBFT. These definitions are published to the Buf registry for integrators' convenience.

The Protobuf files are organized under two domains: cometbft and tendermint. The cometbft.* packages use version suffixes to let application developers target versions of the protocols as they have evolved between CometBFT releases.

Which CometBFT release does each package belong to?

By the 1.0.0 release, the entire set of Protobuf definitions used by CometBFT is published in packages suffixed with .v1. Earlier revisions of the definitions, where they differed, are provided alongside in .v1betaN packages. The correspondence between package suffixes and releases is as follows:

Domain 0.34 0.37 0.38 1.0
abci v1beta1 v1beta2 v1beta3 v1
blocksync v1beta1 v1 v1
consensus v1beta1 v1beta1 v1beta1 v1
crypto v1 v1 v1 v1
libs/bits v1 v1 v1 v1
mempool v1 v1 v1 v1
p2p v1 v1 v1 v1
privval v1beta1 v1beta1 v1 v1
rpc/grpc1 v1beta1 v1beta2 v1beta3
state v1beta1 v1beta2 v1beta3 v1
statesync v1 v1 v1 v1
types v1beta1 v1beta2 v1 v1
version v1 v1 v1 v1

Why does CometBFT provide tendermint Protobuf definitions?

This is as a result of CometBFT being a fork of Tendermint Core and wanting to provide integrators with as painless a way as possible of transitioning from Tendermint Core to CometBFT.

As of CometBFT v1, however, the project will transition to using and providing a cometbft package of Protobuf definitions (see #1330).

Protobuf definitions for each respective release are also, for convenience, published to a corresponding branch in the tendermint/tendermint Buf repository.

CometBFT version Canonical Protobufs Buf registry
v0.38.x v0.38.x Protobuf definitions Buf repository v0.38.x branch
v0.37.x v0.37.x Protobuf definitions Buf repository v0.37.x branch
v0.34.x v0.34.x Protobuf definitions Buf repository v0.34.x branch

Footnotes

  1. Retired in 1.0 ↩