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Cometbft

Cometbft is a Go-based Byzantine fault-tolerant consensus engine and middleware that securely replicates a deterministic state machine across multiple machines.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Cometbft — OpenViST project profile in Infrastructure.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use Cometbft when an application needs replicated state-machine consensus across multiple machines and the development team wants to keep the application state machine separate from the consensus middleware.

Who it is for

  • Blockchain engineers building replicated applications.
  • Cosmos ecosystem developers needing a consensus layer.
  • Teams creating self-hosted or permissioned distributed systems.

Documented uses

  • Replicate a deterministic application state machine across machines.
  • Provide Byzantine fault-tolerant consensus for a blockchain network.
  • Create a Cosmos-compatible consensus layer.
  • Run a self-hosted distributed state replication component.
Before you choose

Requirements & limits

The project is publicly available as open-source software under the Apache-2.0 license. The documented deployment model includes self-hosted command-line and server environments.

  • The application state machine must be deterministic for replicated execution.
  • Cometbft is written in Go, while the replicated application state machine can be written in any programming language.
  • ABCI++ enables customization at every step of the consensus engine.
  • The repository documents single-node and Docker Compose local-start paths.
  • Production users should select a release; the project warns that minor-version upgrades can break existing blockchain compatibility.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Set up a local Cometbft development environment

Install Cometbft and prepare either a single-node setup or a local Docker Compose cluster.

Before you start

  • Go 1.26.6 or higher when working from the main branch, or Go 1.22 or higher for the v0.38.x line.
  • A release rather than the main branch for production use.
  • The Cometbft repository and its installation and quick-start documentation.

Steps

  1. Follow the Cometbft installation guide.

  2. Choose the documented single-node quick start or the local Docker Compose cluster guide.

  3. Use a released version for production-oriented work instead of depending on main.

Expected outcome

A documented local starting point for working with Cometbft as a consensus component.

Guide limitations

  • The supplied documentation describes setup paths but does not provide an application-specific state machine implementation.
  • Minor-version upgrades can introduce breaking changes and may require a new blockchain or custom data migration.
Documentation 1 ↗Documentation 2 ↗
Evidence and transparency

Sources & review

Official repository ↗Guide documentation ↗
Source record details
Source availability
Active
Sources checked
2 October 2026
Original website title
cometbft/cometbft · Official homepage title · retained in its source language
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