BDK

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

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BDK Wallet

The bdk_wallet crate provides the Wallet type which is a simple, high-level interface built from the low-level components of bdk_chain. Wallet is a good starting point for many simple applications as well as a good demonstration of how to use the other mechanisms to construct a wallet. It has two keychains (external and internal) which are defined by miniscript descriptors and uses them to generate addresses. When you give it chain data it also uses the descriptors to find transaction outputs owned by them. From there, you can create and sign transactions.

For details about the API of Wallet see the module-level documentation.

Blockchain data

In order to get blockchain data for Wallet to consume, you should configure a client from an available chain source. Typically you make a request to the chain source and get a response that the Wallet can use to update its view of the chain.

Blockchain Data Sources

• bdk_esplora: Grabs blockchain data from Esplora for updating BDK structures.
• bdk_electrum: Grabs blockchain data from Electrum for updating BDK structures.
• bdk_bitcoind_rpc: Grabs blockchain data from Bitcoin Core for updating BDK structures.

Examples

• example-crates/wallet_esplora_async
• example-crates/wallet_esplora_blocking
• example-crates/wallet_electrum
• example-crates/wallet_rpc

Persistence

To persist Wallet state data use a data store crate that reads and writes ChangeSet.

Implementations

• bdk_file_store: Stores wallet changes in a simple flat file.

Example

use bdk_wallet::{bitcoin::Network, KeychainKind, ChangeSet, Wallet};

// Open or create a new file store for wallet data.
let mut db =
    bdk_file_store::Store::<ChangeSet>::open_or_create_new(b"magic_bytes", "/tmp/my_wallet.db")
        .expect("create store");

// Create a wallet with initial wallet data read from the file store.
let network = Network::Testnet;
let descriptor = "wpkh(tprv8ZgxMBicQKsPdcAqYBpzAFwU5yxBUo88ggoBqu1qPcHUfSbKK1sKMLmC7EAk438btHQrSdu3jGGQa6PA71nvH5nkDexhLteJqkM4dQmWF9g/84'/1'/0'/0/*)";
let change_descriptor = "wpkh(tprv8ZgxMBicQKsPdcAqYBpzAFwU5yxBUo88ggoBqu1qPcHUfSbKK1sKMLmC7EAk438btHQrSdu3jGGQa6PA71nvH5nkDexhLteJqkM4dQmWF9g/84'/1'/0'/1/*)";
let wallet_opt = Wallet::load()
    .descriptor(KeychainKind::External, Some(descriptor))
    .descriptor(KeychainKind::Internal, Some(change_descriptor))
    .extract_keys()
    .check_network(network)
    .load_wallet(&mut db)
    .expect("wallet");
let mut wallet = match wallet_opt {
    Some(wallet) => wallet,
    None => Wallet::create(descriptor, change_descriptor)
        .network(network)
        .create_wallet(&mut db)
        .expect("wallet"),
};

// Get a new address to receive bitcoin.
let receive_address = wallet.reveal_next_address(KeychainKind::External);
// Persist staged wallet data changes to the file store.
wallet.persist(&mut db).expect("persist");
println!("Your new receive address is: {}", receive_address.address);

Testing

Unit testing

cargo test

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.