BDK

A modern, lightweight, descriptor-based wallet library written in Rust!

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About

The bdk library aims to be the core building block for Bitcoin wallets of any kind.

• It uses 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,norun use bdk::Wallet; use bdk::database::MemoryDatabase; use bdk::blockchain::{noopprogress, ElectrumBlockchain};

use bdk::electrum_client::Client;

fn main() -> Result<(), bdk::Error> { let client = 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/)"), bitcoin::Network::Testnet, MemoryDatabase::default(), ElectrumBlockchain::from(client) )?;

wallet.sync(noop_progress(), None)?;

println!("Descriptor balance: {} SAT", wallet.get_balance()?);

Ok(())

} ```

Generate a few addresses

```rust use bdk::{Wallet, database::MemoryDatabase};

fn main() -> Result<(), bdk::Error> { let wallet = Wallet::new_offline( "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/)", Some("wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/)"), bitcoin::Network::Testnet, MemoryDatabase::default(), )?;

println!("Address #0: {}", wallet.get_new_address()?);
println!("Address #1: {}", wallet.get_new_address()?);
println!("Address #2: {}", wallet.get_new_address()?);

Ok(())

} ```

Create a transaction

```rust,norun use bdk::{FeeRate, Wallet}; use bdk::database::MemoryDatabase; use bdk::blockchain::{noopprogress, ElectrumBlockchain};

use bdk::electrum_client::Client;

use bitcoin::consensus::serialize;

fn main() -> Result<(), bdk::Error> { let client = 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/)"), bitcoin::Network::Testnet, MemoryDatabase::default(), ElectrumBlockchain::from(client) )?;

wallet.sync(noop_progress(), None)?;

let send_to = wallet.get_new_address()?;
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(&serialize(&psbt)));

Ok(())

} ```

Sign a transaction

```rust,no_run use bdk::{Wallet, database::MemoryDatabase};

use bitcoin::consensus::deserialize;

fn main() -> Result<(), bdk::Error> { let wallet = Wallet::new_offline( "wpkh([c258d2e4/84h/1h/0h]tprv8griRPhA7342zfRyB6CqeKF8CJDXYu5pgnj1cjL1u2ngKcJha5jjTRimG82ABzJQ4MQe71CV54xfn25BbhCNfEGGJZnxvCDQCd6JkbvxW6h/0/)", Some("wpkh([c258d2e4/84h/1h/0h]tprv8griRPhA7342zfRyB6CqeKF8CJDXYu5pgnj1cjL1u2ngKcJha5jjTRimG82ABzJQ4MQe71CV54xfn25BbhCNfEGGJZnxvCDQCd6JkbvxW6h/1/)"), bitcoin::Network::Testnet, MemoryDatabase::default(), )?;

let psbt = "...";
let psbt = deserialize(&base64::decode(psbt).unwrap())?;

let (signed_psbt, finalized) = wallet.sign(psbt, None)?;

Ok(())

} ```