Byzantine-Fault Tolerant
State Machines.
Or Blockchain, for short.

API Reference
Go version
Discord chat

Branch Tests Coverage Linting
master Tests codecov Lint

Tendermint Core 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.

For protocol details, see the specification.

For detailed analysis of the consensus protocol, including safety and liveness proofs,
see our recent paper, “The latest gossip on BFT consensus“.


Please do not depend on master as your production branch. Use releases instead.

Tendermint has been in the production of private and public environments, most notably the blockchains of the Cosmos Network. we haven’t released v1.0 yet since we are making breaking changes to the protocol and the APIs.
See below for more details about versioning.

In any case, if you intend to run Tendermint in production, we’re happy to help. You can
contact us over email or join the chat.

More on how releases are conducted can be found here.


To report a security vulnerability, see our bug bounty
For examples of the kinds of bugs we’re looking for, see our security policy.

We also maintain a dedicated mailing list for security updates. We will only ever use this mailing list
to notify you of vulnerabilities and fixes in Tendermint Core. You can subscribe here.

Minimum requirements

Requirement Notes
Go version Go1.16 or higher


Complete documentation can be found on the website.


See the install instructions.

Quick Start


Please abide by the Code of Conduct in all interactions.

Before contributing to the project, please take a look at the contributing guidelines
and the style guide. You may also find it helpful to read the
specifications, watch the Developer Sessions,
and familiarize yourself with our
Architectural Decision Records.


Semantic Versioning

Tendermint uses Semantic Versioning to determine when and how the version changes.
According to SemVer, anything in the public API can change at any time before version 1.0.0

To provide some stability to users of 0.X.X versions of Tendermint, the MINOR version is used
to signal breaking changes across Tendermint’s API. This API includes all
publicly exposed types, functions, and methods in non-internal Go packages as well as
the types and methods accessible via the Tendermint RPC interface.

Breaking changes to these public APIs will be documented in the CHANGELOG.


In an effort to avoid accumulating technical debt prior to 1.0.0,
we do not guarantee that breaking changes (ie. bumps in the MINOR version)
will work with existing Tendermint blockchains. In these cases you will
have to start a new blockchain, or write something custom to get the old
data into the new chain. However, any bump in the PATCH version should be
compatible with existing blockchain histories.

For more information on upgrading, see UPGRADING.md.

Supported Versions

Because we are a small core team, we only ship patch updates, including security updates,
to the most recent minor release and the second-most recent minor release. Consequently,
we strongly recommend keeping Tendermint up-to-date. Upgrading instructions can be found


Tendermint Core

We keep a public up-to-date version of our roadmap here

For details about the blockchain data structures and the p2p protocols, see the
Tendermint specification.

For details on using the software, see the documentation which is also
hosted at: https://docs.tendermint.com/master/


Benchmarking is provided by tm-load-test.
Additional tooling can be found in /docs/tools.



Join us!

Tendermint Core is maintained by Interchain GmbH.
If you’d like to work full-time on Tendermint Core, we’re hiring!

Funding for Tendermint Core development comes primarily from the Interchain Foundation,
a Swiss non-profit. The Tendermint trademark is owned by Tendermint Inc., the for-profit entity
that also maintains tendermint.com.


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