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README.md
Rust Bitcoin
Library with support for de/serialization, parsing and executing on data-structures and network messages related to Bitcoin.
Supports (or should support)
- De/serialization of Bitcoin protocol network messages
- De/serialization of blocks and transactions
- Script de/serialization
- Private keys and address creation, de/serialization and validation (including full BIP32 support)
- PSBT v0 de/serialization and all but the Input Finalizer role. Use rust-miniscript to finalize.
For JSONRPC interaction with Bitcoin Core, it is recommended to use rust-bitcoincore-rpc.
It is recommended to always use cargo-crev to verify the trustworthiness of each of your dependencies, including this one.
Known limitations
Consensus
This library must not be used for consensus code (i.e. fully validating blockchain data). It technically supports doing this, but doing so is very ill-advised because there are many deviations, known and unknown, between this library and the Bitcoin Core reference implementation. In a consensus based cryptocurrency such as Bitcoin it is critical that all parties are using the same rules to validate data, and this library is simply unable to implement the same rules as Core.
Given the complexity of both C++ and Rust, it is unlikely that this will ever be fixed, and there are no plans to do so. Of course, patches to fix specific consensus incompatibilities are welcome.
Support for 16-bit pointer sizes
16-bit pointer sizes are not supported and we can't promise they will be. If you care about them please let us know, so we can know how large the interest is and possibly decide to support them.
Documentation
Currently can be found on docs.rs/bitcoin. Patches to add usage examples and to expand on existing docs would be extremely appreciated.
Contributing
Contributions are generally welcome. If you intend to make larger changes please discuss them in an issue before PRing them to avoid duplicate work and architectural mismatches. If you have any questions or ideas you want to discuss please join us in #bitcoin-rust on libera.chat.
For more information please see CONTRIBUTING.md.
Minimum Supported Rust Version (MSRV)
This library should always compile with any combination of features on Rust 1.63.0.
Use Cargo-minimal.lock to build the MSRV by copying to Cargo.lock and building.
External dependencies
We integrate with a few external libraries, most notably serde. These
are available via feature flags. To ensure compatibility and MSRV stability we
provide two lock files as a means of inspecting compatible versions:
Cargo-minimal.lock containing minimal versions of dependencies and
Cargo-recent.lock containing recent versions of dependencies tested in our CI.
We do not provide any guarantees about the content of these lock files outside of "our CI didn't fail with these versions". Specifically, we do not guarantee that the committed hashes are free from malware. It is your responsibility to review them.
Installing Rust
Rust can be installed using your package manager of choice or rustup.rs. The
former way is considered more secure since it typically doesn't involve trust in the CA system. But
you should be aware that the version of Rust shipped by your distribution might be out of date.
Generally this isn't a problem for rust-bitcoin since we support much older versions than the
current stable one (see MSRV section).
Building
The cargo feature std is enabled by default. At least one of the features std or no-std or
both must be enabled.
Enabling the no-std feature does not disable std. To disable the std feature you must disable
default features. The no-std feature only enables additional features required for this crate to
be usable without std. Both can be enabled without conflict.
The library can be built and tested using cargo:
git clone git@github.com:rust-bitcoin/rust-bitcoin.git
cd rust-bitcoin
cargo build
You can run tests with:
cargo test
Please refer to the cargo documentation for more
detailed instructions.
Just
We support just for running dev workflow commands. Run just from
your shell to see list available sub-commands.
Building the docs
We build docs with the nightly toolchain, you may wish to use the following shell alias to check your documentation changes build correctly.
alias build-docs='RUSTDOCFLAGS="--cfg docsrs" cargo +nightly rustdoc --features="$FEATURES" -- -D rustdoc::broken-intra-doc-links'
Testing
Unit and integration tests are available for those interested, along with benchmarks. For project developers, especially new contributors looking for something to work on, we do:
There are always more tests to write and more bugs to find, contributions to our testing efforts extremely welcomed. Please consider testing code a first class citizen, we definitely do take PRs improving and cleaning up test code.
Unit/Integration tests
Run as for any other Rust project cargo test --all-features.
Benchmarks
We use a custom Rust compiler configuration conditional to guard the bench mark code. To run the
bench marks use: RUSTFLAGS='--cfg=bench' cargo +nightly bench.
Mutation tests
We have started doing mutation testing with mutagen. To run
these tests first install the latest dev version with cargo +nightly install --git https://github.com/llogiq/mutagen
then run with RUSTFLAGS='--cfg=mutate' cargo +nightly mutagen.
Code verification
We have started using kani, install with cargo install --locked kani-verifier
(no need to run cargo kani setup). Run the tests with cargo kani.
Pull Requests
Every PR needs at least two reviews to get merged. During the review phase maintainers and
contributors are likely to leave comments and request changes. Please try to address them, otherwise
your PR might get closed without merging after a longer time of inactivity. If your PR isn't ready
for review yet please mark it by prefixing the title with WIP: .
CI Pipeline
The CI pipeline requires approval before being run on each MR.
In order to speed up the review process the CI pipeline can be run locally using
act. The fuzz and Cross jobs will be skipped when using act
due to caching being unsupported at this time. We do not actively support act but will merge PRs
fixing act issues.
Githooks
To assist devs in catching errors before running CI we provide some githooks. Copy the hooks in githooks/
to your githooks folder or run just githooks-install to copy them all.
Policy on Altcoins/Altchains
Since the altcoin landscape includes projects which frequently appear and disappear, and are poorly designed anyway we do not support any altcoins. Supporting Bitcoin properly is already difficult enough and we do not want to increase the maintenance burden and decrease API stability by adding support for other coins.
Our code is public domain so by all means fork it and go wild :)
Release Notes
Release notes are done per crate, see:
Licensing
The code in this project is licensed under the Creative Commons CC0 1.0 Universal license. We use the SPDX license list and SPDX IDs.