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COMIT is an open protocol facilitating cross-blockchain applications. For example, with COMIT you can exchange Bitcoin for Ether or any ERC20 token directly with another person.

This repository contains the reference implementation of the protocol written in Rust.

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The Rust reference implementation of the COMIT protocol (comit-rs) implements atomic swaps using constructs like Hash Time-Locked Contracts (HTLCs) to keep your funds safe at any time.


This repository is a cargo workspace:

  • cnd: a non-custodial COMIT network daemon, designed to be driven by a client with wallets (f.e. Ambrosia)
  • nectar: a custodial COMIT network daemon, designed for automated trades
  • comit: a library implementing primitives of the COMIT protocol like libp2p-protocols, the decentralized orderbook and locking- as well as swap-protocols

cnd and nectar are released as binaries.

The comit library will be released to once its interface stabilizes.

Setup build environment

All you need is love Rust: curl -sSf | sh

Build binaries

  • cargo build --release --package cnd
  • cargo build --release --package nectar

Run binaries

Both, cnd and nectar require a connection to a Bitcoin and an Ethereum full node. All config file options have sensible defaults but can also be overridden. Run cnd dump-config or nectar dump-config for more information.

Setup testing/dev environment

  1. Install docker,
  2. Install node (check the version required in tests/package.json) & yarn,
  3. Run make in the root folder of the repository, this will install various crates & tools such as clippy.


  • make test is just a wrapper around cargo test --all
  • make e2e will run all the end-to-end tests

To run individual end-to-end tests, use yarn inside the tests folder:

  • yarn run test: run all tests
  • yarn run test <directory>: run all tests in the directory
  • yarn run test <path to test file>: run all tests in this test file, supports shell glob on the path
  • yarn run fix: run prettier and linter to fix format
  • yarn run check: run tsc (to check validity of TypeScript code) and verify format

Cnd over Tor

If you would like to maintain anonymity while using cnd for atomic swaps we support running cnd over Tor. You will need to configure an onion service (previously hidden service), virtual port can be anything but cnd expects the local port to be 9939.

HiddenServiceDir /var/lib/tor/hidden_service/
HiddenServicePort 9939

After starting Tor for the first time get the onion service address from your local file system (e.g. /var/lib/tor/hidden_service/hostname) and add it to your cnd config file.

listen = ["/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd:9939"]

All cnd traffic will now be routed over the Tor network.


Contributions are welcome, please visit CONTRIBUTING for more details.

If you have any question please reach out to the team in our Gitter chat!


This project is licensed under the terms of the GNU GENERAL PUBLIC LICENSE v3.

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