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bitcoin-core Haskell integration

bitcoind-rpc

This is a Haskell interface to the bitcoin-core daemon RPC. It expresses parameters and return values with types from haskoin-core where possible. Not all RPC methods are supported, but there are enough to be useful for many applications.

bitcoind-regtest

This package provides some tooling for testing a bitcoin-core integration. Features include:

  • Spin up ephemeral regtest nodes
  • Fund outputs in one line
  • Simple HD wallet
  • Autominer to generate blocks with many transactions

Supported bitcoin-core versions

Full support only for v27.0.

Limited support for:

  • v25.2
  • v26.1

Test suite

The test suite is in bitcoind-regtest and only runs on Linux. There is also a nix derivation to run the test suite against multiple bitcoind versions:

nix-build nix/multi-version-test.nix
./result

To dump a representation of each bitcoind RPC version suitable for diffing:

nix-build nix/rpc-versions.nix
./result

Development

git clone https://github.com/bitnomial/bitcoind-rpc
cd bitcoind-rpc
cabal build all && cabal test all

Please use ormolu or fourmolu (with the default configuration) for code formatting.

Known issues

  • A bug in servant-client regarding the mishandling of empty query string parameters causes bad requests to be sent to bitcoin's RPC server using this library; the issue has since been fixed upstream in servant by haskell-servant/servant#1589, however the fix is only released on servant-client-0.20 or newer, if you need a build plan where only servant-client-0.19 is available (e.g. stackage LTS <21.22) make sure to include that fix, or pin 58aa0d1c0c19f7b1c26ffc52bfd65c70934704c9 which is the latest release on servant-0.19.* series that's known to work reliably. Most likely if using GHC 9.6 or greater there's no need to worry about this.