The Bitcoin Dev Kit

A suite of libraries for building modern, lightweight, descriptor-based wallets written in Rust!

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About

The bdk libraries aim to provide well engineered and reviewed components for Bitcoin wallets and other applications. They are built upon the excellent rust-bitcoin and rust-miniscript crates.

Architecture

The workspace in this repository contains several crates in the /crates directory:

Sub-Directory	Description	Badges
chain	Tools for storing and indexing chain data.
core	A collection of core structures used by the bdk_chain, bdk_wallet, and BDK's chain data source crates.
esplora	Extends the esplora-client crate with methods to fetch chain data from an esplora HTTP server in the form that bdk_chain and Wallet can consume.
electrum	Extends the electrum-client crate with methods to fetch chain data from an electrum server in the form that bdk_chain and Wallet can consume.
bitcoind_rpc	Extends bitcoincore-rpc for emitting blockchain data from the bitcoind RPC interface in the form that bdk_chain and Wallet can consume.
file_store	Persistence backend for storing chain data in a single file. Intended for testing and development purposes, not for production.

The bdk_wallet repository and crate contains a higher level Wallet type that depends on the above lower-level mechanism crates.

Fully working examples of how to use these components are in /examples:

• example_cli: Library used by the example_* crates. Provides utilities for syncing, showing the balance, generating addresses and creating transactions without using the bdk_wallet Wallet.
• example_electrum: A command line Bitcoin wallet application built on top of example_cli and the electrum crate. It shows the power of the bdk tools (chain + file_store + electrum), without depending on the main bdk_wallet library.
• example_esplora: A command line Bitcoin wallet application built on top of example_cli and the esplora crate. It shows the power of the bdk tools (chain + file_store + esplora), without depending on the main bdk_wallet library.
• example_bitcoind_rpc_polling: A command line Bitcoin wallet application built on top of example_cli and the bitcoind_rpc crate. It shows the power of the bdk tools (chain + file_store + bitcoind_rpc), without depending on the main bdk_wallet library.

Minimum Supported Rust Version (MSRV)

The following BDK crates maintains a MSRV of 1.63.0. To build these crates with the MSRV of 1.63.0 you will need to pin dependencies by running the pin-msrv.sh script.

• bdk_core
• bdk_chain
• bdk_bitcoind_rpc
• bdk_esplora
• bdk_file_store

The MSRV of the bdk_electrum crate is 1.75.0.

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.