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https://github.com/cometbft/cometbft

CometBFT: A distributed, Byzantine fault-tolerant, deterministic state machine replication engine. A fork and successor to Tendermint Core.
https://github.com/cometbft/cometbft

bft blockchain cosmos database distributed-systems go tendermint-consensus

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CometBFT: A distributed, Byzantine fault-tolerant, deterministic state machine replication engine. A fork and successor to Tendermint Core.

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README 

        
# CometBFT



[Byzantine-Fault Tolerant][bft] [State Machine Replication][smr]. Or

[Blockchain], for short.



[![Version][version-badge]][version-url]

[![API Reference][api-badge]][api-url]

[![Go version][go-badge]][go-url]

[![License][license-badge]][license-url]

[![Sourcegraph][sg-badge]][sg-url]



[![Discord chat][discord-badge]][discord-url]



| Branch  | Tests                                          | Linting                                     |

|---------|------------------------------------------------|---------------------------------------------|

| main    | [![Tests][tests-badge]][tests-url]             | [![Lint][lint-badge]][lint-url]             |

| v1.x    | [![Tests][tests-badge-v1x]][tests-url-v1x]     | [![Lint][lint-badge-v1x]][lint-url-v1x]     |

| v0.38.x | [![Tests][tests-badge-v038x]][tests-url-v038x] | [![Lint][lint-badge-v038x]][lint-url-v038x] |

| v0.37.x | [![Tests][tests-badge-v037x]][tests-url-v037x] | [![Lint][lint-badge-v037x]][lint-url-v037x] |

| v0.34.x | [![Tests][tests-badge-v034x]][tests-url-v034x] | [![Lint][lint-badge-v034x]][lint-url-v034x] |



CometBFT is a Byzantine Fault Tolerant (BFT) middleware that takes a

state transition machine - written in any programming language - and securely

replicates it on many machines. In modular blockchain terminology,

CometBFT can be thought of as a sequencer layer and is indeed used in

modern decentralized (shared) sequencer implementations.



CometBFT is the canonical implementation of the Tendermint consensus algorithm and is a

primary building block for the [Interchain Stack](https://interchain.io/). Historically,

CometBFT originated as a fork of [Tendermint Core][tm-core] in early 2023

(announcement [here][comet-announcement]) and since then it diverged significantly by adopting modern features such as [PBTS][pbts] or [ABCI v2][abci-v2]. CometBFT provides [optimistic responsiveness][optimistic-responsive] guarantees.



For protocol details, refer to the [CometBFT Specification](./spec/README.md).



For detailed analysis of the Tendermint consensus protocol, including safety and liveness

proofs, read our paper, "[The latest gossip on BFT

consensus](https://arxiv.org/abs/1807.04938)".



For general links, including communications and announcements: [![Linktree][linktree-badge] linktr.ee/cometbft][linktree-url]



## Documentation



Complete documentation can be found on the

[website](https://docs.cometbft.com/).



## Releases



Please do not depend on `main` as your production branch, as it may receive

significant breaking changes at any time. Use

[releases](https://github.com/cometbft/cometbft/releases) instead.



If you intend to run CometBFT in production, we're happy to help. To contact us,

in order of preference:



- [Create a new discussion on

  GitHub](https://github.com/cometbft/cometbft/discussions)

- Reach out to us via [Telegram](https://t.me/CometBFT)

- [Join the Cosmos Network Discord](https://discord.gg/interchain) and

  discuss in

  [`#cometbft`](https://discord.com/channels/669268347736686612/1069933855307472906)



More on how releases are conducted can be found [here](./RELEASES.md).



## Support Policy



CometBFT aligns with other components of the [Interchain Stack](https://interchain.io/)

and we offer long-term support (LTS) guarantees for certain releases. The

complete End of Life (EOL) schedule, LTS plans, and the general support policy is

in documented and regularly updated in the

discussion [Support policy for CometBFT releases #590](https://github.com/cometbft/cometbft/discussions/590).



## Security



Please see [SECURITY.md](./SECURITY.md).



## Minimum requirements



| CometBFT version | Requirement | Version        | Tested with  |

|------------------|-------------|----------------|--------------|

| main             | Go version  | 1.23 or higher | up to 1.23.1 |

| v1.x             | Go version  | 1.23 or higher | up to 1.23.1 |

| v0.38.x          | Go version  | 1.22 or higher | up to 1.22   |

| v0.37.x          | Go version  | 1.22 or higher | up to 1.22   |

| v0.34.x          | Go version  | 1.22 or higher | up to 1.22   |



### Install



See the [install guide](docs/tutorials/install.md).



### Quick Start



- [Single node](docs/tutorials/quick-start.md)



## Contributing



Please abide by the [Code of Conduct](CODE_OF_CONDUCT.md) in all interactions.



Before contributing to the project, please take a look at the [contributing

guidelines](CONTRIBUTING.md) and the [style guide](STYLE_GUIDE.md). You may also

find it helpful to read the [specifications](./spec/README.md), and familiarize

yourself with our [Architectural Decision Records

(ADRs)](docs/references/architecture/README.md) and [Request For Comments

(RFCs)](docs/references/rfc/README.md).



## Versioning



As of v1, CometBFT uses the following approach to versioning:



- **Major version** bumps, such as v1.0.0 to v2.0.0, would generally involve

  changes that _force_ users to perform a coordinated upgrade in order to use

  the new version, such as protocol-breaking changes (e.g. changes to how block

  hashes are computed and thus what the network considers to be "valid blocks",

  or how the consensus protocol works, or changes that affect network-level

  compatibility between nodes, etc.).

- **Minor version** bumps, such as v1.1.0 to v1.2.0, are reserved for rolling

  out new features or substantial changes that do not force a coordinated

  upgrade (i.e. not protocol-breaking), but could potentially break Go APIs.

- **Patch version** bumps, such as v1.0.0 to v1.0.1, are reserved for

  bug/security fixes that are not protocol- or Go API-breaking.



### Upgrades



We do not guarantee compatibility between major releases of CometBFT. Minor

releases of the same major release series (v1.1, v1.2, etc.) should, unless

otherwise specified, be compatible with each other. Patch releases of the same

minor release series (v1.0.1, v1.0.2, etc.) are guaranteed to be compatible with

each other.



For more detailed information on upgrading from one version to another, see

[UPGRADING.md](./UPGRADING.md).



### Supported Versions



Because we are a small core team, we have limited capacity to ship patch

updates, including security updates. Consequently, we strongly recommend keeping

CometBFT up-to-date. Upgrading instructions can be found in

[UPGRADING.md](./UPGRADING.md).



Currently supported versions include:



- v1.x: Currently in pre-release with no guarantees as to API stability until a

  release candidate is cut. See [RELEASES.md](./RELEASES.md) for details on our

  process as to API stability guarantees that can be expected of CometBFT

  pre-releases.

- v0.38.x: CometBFT v0.38 introduces ABCI 2.0, which implements the entirety of

  ABCI++

- v0.37.x: CometBFT v0.37 introduces ABCI 1.0, which is the first major step

  towards the full ABCI++ implementation in ABCI 2.0

- v0.34.x: The CometBFT v0.34 series is compatible with the Tendermint Core

  v0.34 series



## Resources



### Libraries



- [Cosmos SDK](http://github.com/cosmos/cosmos-sdk): A framework for building

  high-value public blockchain applications in Go

- [Tendermint in Rust](https://github.com/informalsystems/tendermint-rs)

- [ABCI Tower](https://github.com/penumbra-zone/tower-abci)



### Applications



- [Cosmos Hub](https://hub.cosmos.network/)

- [Celestia](https://celestia.org/)

- [Anoma](https://anoma.network/)

- [Vocdoni](https://developer.vocdoni.io/)



### Research



Below are links to the original Tendermint consensus algorithm and relevant

whitepapers, which CometBFT will continue to build on.



- [The latest gossip on BFT consensus](https://arxiv.org/abs/1807.04938)

- [Master's Thesis on Tendermint](https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9769)

- [Original Whitepaper: "Tendermint: Consensus Without Mining"](https://tendermint.com/static/docs/tendermint.pdf)



## Join us



CometBFT is currently maintained by [Informal

Systems](https://informal.systems). If you'd like to work full-time on CometBFT,

[we're hiring](https://informal.systems/careers)!



Funding for CometBFT development comes primarily from the [Interchain

Foundation](https://interchain.io), a Swiss non-profit. Informal Systems also

maintains [cometbft.com](https://cometbft.com).



[bft]: https://en.wikipedia.org/wiki/Byzantine_fault_tolerance

[smr]: https://en.wikipedia.org/wiki/State_machine_replication

[optimistic-responsive]: https://informal.systems/blog/tendermint-responsiveness

[Blockchain]: https://en.wikipedia.org/wiki/Blockchain

[version-badge]: https://img.shields.io/github/v/release/cometbft/cometbft.svg

[version-url]: https://github.com/cometbft/cometbft/releases/latest

[api-badge]: https://pkg.go.dev/badge/github.com/cometbft/cometbft.svg

[api-url]: https://pkg.go.dev/github.com/cometbft/cometbft

[go-badge]: https://img.shields.io/badge/go-1.21-blue.svg

[go-url]: https://github.com/moovweb/gvm

[discord-badge]: https://img.shields.io/discord/669268347736686612.svg

[discord-url]: https://discord.gg/interchain

[license-badge]: https://img.shields.io/github/license/cometbft/cometbft.svg

[license-url]: https://github.com/cometbft/cometbft/blob/main/LICENSE

[sg-badge]: https://sourcegraph.com/github.com/cometbft/cometbft/-/badge.svg

[sg-url]: https://sourcegraph.com/github.com/cometbft/cometbft?badge

[tests-url]: https://github.com/cometbft/cometbft/actions/workflows/tests.yml

[tests-url-v1x]: https://github.com/cometbft/cometbft/actions/workflows/tests.yml?query=branch%3Av1.x

[tests-url-v038x]: https://github.com/cometbft/cometbft/actions/workflows/tests.yml?query=branch%3Av0.38.x

[tests-url-v037x]: https://github.com/cometbft/cometbft/actions/workflows/tests.yml?query=branch%3Av0.37.x

[tests-url-v034x]: https://github.com/cometbft/cometbft/actions/workflows/tests.yml?query=branch%3Av0.34.x

[tests-badge]: https://github.com/cometbft/cometbft/actions/workflows/tests.yml/badge.svg?branch=main

[tests-badge-v1x]: https://github.com/cometbft/cometbft/actions/workflows/tests.yml/badge.svg?branch=v1.x

[tests-badge-v038x]: https://github.com/cometbft/cometbft/actions/workflows/tests.yml/badge.svg?branch=v0.38.x

[tests-badge-v037x]: https://github.com/cometbft/cometbft/actions/workflows/tests.yml/badge.svg?branch=v0.37.x

[tests-badge-v034x]: https://github.com/cometbft/cometbft/actions/workflows/tests.yml/badge.svg?branch=v0.34.x

[lint-badge]: https://github.com/cometbft/cometbft/actions/workflows/lint.yml/badge.svg?branch=main

[lint-badge-v034x]: https://github.com/cometbft/cometbft/actions/workflows/lint.yml/badge.svg?branch=v0.34.x

[lint-badge-v037x]: https://github.com/cometbft/cometbft/actions/workflows/lint.yml/badge.svg?branch=v0.37.x

[lint-badge-v038x]: https://github.com/cometbft/cometbft/actions/workflows/lint.yml/badge.svg?branch=v0.38.x

[lint-badge-v1x]: https://github.com/cometbft/cometbft/actions/workflows/lint.yml/badge.svg?branch=v1.x

[lint-url]: https://github.com/cometbft/cometbft/actions/workflows/lint.yml

[lint-url-v034x]: https://github.com/cometbft/cometbft/actions/workflows/lint.yml?query=branch%3Av0.34.x

[lint-url-v037x]: https://github.com/cometbft/cometbft/actions/workflows/lint.yml?query=branch%3Av0.37.x

[lint-url-v038x]: https://github.com/cometbft/cometbft/actions/workflows/lint.yml?query=branch%3Av0.38.x

[lint-url-v1x]: https://github.com/cometbft/cometbft/actions/workflows/lint.yml?query=branch%3Av1.x

[tm-core]: https://github.com/tendermint/tendermint

[pbts]: https://docs.cometbft.com/v1.0/explanation/core/proposer-based-timestamps

[abci-v2]: https://docs.cometbft.com/v1.0/spec/abci/

[comet-announcement]: https://informal.systems/blog/cosmos-meet-cometbft

[linktree-url]: https://linktr.ee/cometbft

[linktree-badge]: https://www.google.com/s2/favicons?domain=https://linktr.ee/