<div align="center">
<h1>BDK</h1>
<img src="./static/bdk.png" width="220" />
<p>
<strong>A modern, lightweight, descriptor-based wallet library written in Rust!</strong>
</p>
<p>
<a href="https://crates.io/crates/bdk"><img alt="Crate Info" src="https://img.shields.io/crates/v/bdk.svg"/></a>
<a href="https://github.com/bitcoindevkit/bdk/blob/master/LICENSE"><img alt="MIT or Apache-2.0 Licensed" src="https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg"/></a>
<a href="https://github.com/bitcoindevkit/bdk/actions?query=workflow%3ACI"><img alt="CI Status" src="https://github.com/bitcoindevkit/bdk/workflows/CI/badge.svg"></a>
<a href="https://coveralls.io/github/bitcoindevkit/bdk?branch=master"><img src="https://coveralls.io/repos/github/bitcoindevkit/bdk/badge.svg?branch=master"/></a>
<a href="https://docs.rs/bdk"><img alt="API Docs" src="https://img.shields.io/badge/docs.rs-bdk-green"/></a>
<a href="https://blog.rust-lang.org/2021/12/02/Rust-1.57.0.html"><img alt="Rustc Version 1.57.0+" src="https://img.shields.io/badge/rustc-1.57.0%2B-lightgrey.svg"/></a>
<a href="https://discord.gg/d7NkDKm"><img alt="Chat on Discord" src="https://img.shields.io/discord/753336465005608961?logo=discord"></a>
</p>
<h4>
<a href="https://bitcoindevkit.org">Project Homepage</a>
<span> | </span>
<a href="https://docs.rs/bdk">Documentation</a>
</h4>
</div>
## About
The `bdk` library aims to be the core building block for Bitcoin wallets of any kind.
* It uses [Miniscript](https://github.com/rust-bitcoin/rust-miniscript) to support descriptors with generalized conditions. This exact same library can be used to build
single-sig wallets, multisigs, timelocked contracts and more.
* It supports multiple blockchain backends and databases, allowing developers to choose exactly what's right for their projects.
* It's built to be cross-platform: the core logic works on desktop, mobile, and even WebAssembly.
* It's very easy to extend: developers can implement customized logic for blockchain backends, databases, signers, coin selection, and more, without having to fork and modify this library.
## Examples
### Sync the balance of a descriptor
```rust,no_run
use bdk::Wallet;
use bdk::database::MemoryDatabase;
use bdk::blockchain::ElectrumBlockchain;
use bdk::SyncOptions;
use bdk::electrum_client::Client;
use bdk::bitcoin::Network;
fn main() -> Result<(), bdk::Error> {
let blockchain = ElectrumBlockchain::from(Client::new("ssl://electrum.blockstream.info:60002")?);
let wallet = Wallet::new(
"wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)",
Some("wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/*)"),
Network::Testnet,
MemoryDatabase::default(),
)?;
wallet.sync(&blockchain, SyncOptions::default())?;
println!("Descriptor balance: {} SAT", wallet.get_balance()?);
Ok(())
}
```
### Generate a few addresses
```rust
use bdk::{Wallet, database::MemoryDatabase};
use bdk::wallet::AddressIndex::New;
use bdk::bitcoin::Network;
fn main() -> Result<(), bdk::Error> {
let wallet = Wallet::new(
"wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)",
Some("wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/*)"),
Network::Testnet,
MemoryDatabase::default(),
)?;
println!("Address #0: {}", wallet.get_address(New)?);
println!("Address #1: {}", wallet.get_address(New)?);
println!("Address #2: {}", wallet.get_address(New)?);
Ok(())
}
```
### Create a transaction
```rust,no_run
use bdk::{FeeRate, Wallet, SyncOptions};
use bdk::database::MemoryDatabase;
use bdk::blockchain::ElectrumBlockchain;
use bdk::electrum_client::Client;
use bdk::wallet::AddressIndex::New;
use bitcoin::base64;
use bdk::bitcoin::consensus::serialize;
use bdk::bitcoin::Network;
fn main() -> Result<(), bdk::Error> {
let blockchain = ElectrumBlockchain::from(Client::new("ssl://electrum.blockstream.info:60002")?);
let wallet = Wallet::new(
"wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)",
Some("wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/*)"),
Network::Testnet,
MemoryDatabase::default(),
)?;
wallet.sync(&blockchain, SyncOptions::default())?;
let send_to = wallet.get_address(New)?;
let (psbt, details) = {
let mut builder = wallet.build_tx();
builder
.add_recipient(send_to.script_pubkey(), 50_000)
.enable_rbf()
.do_not_spend_change()
.fee_rate(FeeRate::from_sat_per_vb(5.0));
builder.finish()?
};
println!("Transaction details: {:#?}", details);
println!("Unsigned PSBT: {}", base64::encode(psbt.serialize()));
Ok(())
}
```
### Sign a transaction
```rust,no_run
use bdk::{Wallet, SignOptions, database::MemoryDatabase};
use bitcoin::base64;
use bdk::bitcoin::consensus::deserialize;
use bdk::bitcoin::{psbt::Psbt, Network};
fn main() -> Result<(), bdk::Error> {
let wallet = Wallet::new(
"wpkh([c258d2e4/84h/1h/0h]tprv8griRPhA7342zfRyB6CqeKF8CJDXYu5pgnj1cjL1u2ngKcJha5jjTRimG82ABzJQ4MQe71CV54xfn25BbhCNfEGGJZnxvCDQCd6JkbvxW6h/0/*)",
Some("wpkh([c258d2e4/84h/1h/0h]tprv8griRPhA7342zfRyB6CqeKF8CJDXYu5pgnj1cjL1u2ngKcJha5jjTRimG82ABzJQ4MQe71CV54xfn25BbhCNfEGGJZnxvCDQCd6JkbvxW6h/1/*)"),
Network::Testnet,
MemoryDatabase::default(),
)?;
let psbt = "...";
let mut psbt = Psbt::deserialize(&base64::decode(psbt).unwrap())?;
let _finalized = wallet.sign(&mut psbt, SignOptions::default())?;
Ok(())
}
```
## Testing
### Unit testing
```bash
cargo test
```
### Integration testing
Integration testing require testing features, for example:
```bash
cargo test --features test-electrum
```
The other options are `test-esplora`, `test-rpc` or `test-rpc-legacy` which runs against an older version of Bitcoin Core.
Note that `electrs` and `bitcoind` binaries are automatically downloaded (on mac and linux), to specify you already have installed binaries you must use `--no-default-features` and provide `BITCOIND_EXE` and `ELECTRS_EXE` as environment variables.
## Running under WASM
If you want to run this library under WASM you will probably have to add the following lines to you `Cargo.toml`:
```toml
[dependencies]
getrandom = { version = "0.2", features = ["js"] }
```
This enables the `rand` crate to work in environments where JavaScript is available. See [this link](https://docs.rs/getrandom/0.2.8/getrandom/#webassembly-support) to learn more.
## License
Licensed under either of
* Apache License, Version 2.0
([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license
([LICENSE-MIT](LICENSE-MIT) or http://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.
## Minimum Supported Rust Version (MSRV)
This library should compile with any combination of features with Rust 1.57.0.
To build with the MSRV you will need to pin dependencies as follows:
```shell
# log 0.4.19 has MSRV 1.60.0
cargo update -p log --precise "0.4.18"
# tempfile 3.7.0 has MSRV 1.63.0
cargo update -p tempfile --precise "3.6.0"
# required for sqlite feature, hashlink 0.8.2 has MSRV 1.61.0
cargo update -p hashlink --precise "0.8.1"
# required for compact_filters feature, regex after 1.7.3 has MSRV 1.60.0
cargo update -p regex --precise "1.7.3"
# zip 0.6.3 has MSRV 1.59.0 but still works
cargo update -p zip:0.6.6 --precise "0.6.3"
# rustix 0.38.0 has MSRV 1.65.0
cargo update -p rustix --precise "0.37.23"
# tokio 1.30 has MSRV 1.63.0+
cargo update -p tokio --precise "1.29.1"
# tokio-util 0.7.9 doesn't build with MSRV 1.57.0
cargo update -p tokio-util --precise "0.7.8"
# cc 1.0.82 is throwing error with rust 1.57.0, "error[E0599]: no method named `retain_mut`..."
cargo update -p cc --precise "1.0.81"
# rustls 0.20.9 has MSRV 1.60.0+
cargo update -p rustls:0.20.9 --precise "0.20.8"
# rustls 0.21.2 has MSRV 1.60.0+
cargo update -p rustls:0.21.7 --precise "0.21.1"
# flate2 1.0.27 has MSRV 1.63.0+
cargo update -p flate2:1.0.27 --precise "1.0.26"
# reqwest 0.11.19 has MSRV 1.63.0+
cargo update -p reqwest --precise "0.11.18"
# h2 0.3.21 has MSRV 1.63.0+
cargo update -p h2 --precise "0.3.20"
# rustls-webpki 0.100.2 has MSRV 1.60+
cargo update -p rustls-webpki:0.100.3 --precise "0.100.1"
# rustls-webpki 0.101.6 has MSRV 1.60+
cargo update -p rustls-webpki:0.101.6 --precise "0.101.1"
```