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Merge bitcoindevkit/bdk#780: Update psbt_signer example to use descriptor! macro

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1331193800911bb8168e5d1c2689676af3c1fe86 Update psbt_signer example to use descriptor! macro (Steve Myers)

Pull request description:

  ### Description

  This is a small fix to the psbt_signer example to also use the `descriptor!` macro.

  ### Notes to the reviewers

  I also added more docs to at the beginning of the example.

  ### Changelog notice

  None

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

  #### New Example:

  * [x] I've added docs for the new example

ACKs for top commit:
  danielabrozzoni:
    ACK 1331193800911bb8168e5d1c2689676af3c1fe86

Tree-SHA512: 602fa317313dea77bc4804abce500db33d5834625704019c6590ae6b80cf339cbaddffef667eaef2696e8e769756a2c2405c84109409ef33816db60d3df4d53d
This commit is contained in:
Daniela Brozzoni 2022-10-12 11:05:22 +01:00
commit b627455b8f
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1 changed files with 24 additions and 6 deletions
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30
examples/psbt_signer.rs
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@ -9,20 +9,38 @@
use bdk::blockchain::{Blockchain, ElectrumBlockchain};
use bdk::database::MemoryDatabase;
use bdk::wallet::AddressIndex;
use bdk::SyncOptions;
use bdk::{descriptor, SyncOptions};
use bdk::{FeeRate, SignOptions, Wallet};
use bitcoin::secp256k1::Secp256k1;
use bitcoin::{Address, Network};
use electrum_client::Client;
use miniscript::descriptor::DescriptorSecretKey;
use std::error::Error;
use std::str::FromStr;
/// This example shows how to sign and broadcast the transaction for a PSBT (Partially Signed
/// Bitcoin Transaction) for a single key, witness public key hash (WPKH) based descriptor wallet.
/// The electrum protocol is used to sync blockchain data from the testnet bitcoin network and
/// wallet data is stored in an ephemeral in-memory database. The process steps are:
/// 1. Create a "signing" wallet and a "watch-only" wallet based on the same private keys.
/// 2. Deposit testnet funds into the watch only wallet.
/// 3. Sync the watch only wallet and create a spending transaction to return all funds to the testnet faucet.
/// 4. Sync the signing wallet and sign and finalize the PSBT created by the watch only wallet.
/// 5. Broadcast the transactions from the finalized PSBT.
fn main() -> Result<(), Box<dyn Error>> {
// test keys created with `bdk-cli key generate` and `bdk-cli key derive` commands
let signing_external_descriptor = "wpkh([e9824965/84'/1'/0']tprv8fvem7qWxY3SGCQczQpRpqTKg455wf1zgixn6MZ4ze8gRfHjov5gXBQTadNfDgqs9ERbZZ3Bi1PNYrCCusFLucT39K525MWLpeURjHwUsfX/0/*)";
let signing_internal_descriptor = "wpkh([e9824965/84'/1'/0']tprv8fvem7qWxY3SGCQczQpRpqTKg455wf1zgixn6MZ4ze8gRfHjov5gXBQTadNfDgqs9ERbZZ3Bi1PNYrCCusFLucT39K525MWLpeURjHwUsfX/1/*)";
// test key created with `bdk-cli key generate` and `bdk-cli key derive` commands
let external_secret_xkey = DescriptorSecretKey::from_str("[e9824965/84'/1'/0']tprv8fvem7qWxY3SGCQczQpRpqTKg455wf1zgixn6MZ4ze8gRfHjov5gXBQTadNfDgqs9ERbZZ3Bi1PNYrCCusFLucT39K525MWLpeURjHwUsfX/0/*").unwrap();
let internal_secret_xkey = DescriptorSecretKey::from_str("[e9824965/84'/1'/0']tprv8fvem7qWxY3SGCQczQpRpqTKg455wf1zgixn6MZ4ze8gRfHjov5gXBQTadNfDgqs9ERbZZ3Bi1PNYrCCusFLucT39K525MWLpeURjHwUsfX/1/*").unwrap();
let watch_only_external_descriptor = "wpkh([e9824965/84'/1'/0']tpubDCcguXsm6uj79fSQt4V2EF7SF5b26zCuG2ZZNsbNQuw5G9YWSJuGhg2KknQBywRq4VGTu41zYTCh3QeVFyBdbsymgRX9Mrts94SW7obEdqs/0/*)";
let watch_only_internal_descriptor = "wpkh([e9824965/84'/1'/0']tpubDCcguXsm6uj79fSQt4V2EF7SF5b26zCuG2ZZNsbNQuw5G9YWSJuGhg2KknQBywRq4VGTu41zYTCh3QeVFyBdbsymgRX9Mrts94SW7obEdqs/1/*)";
let secp = Secp256k1::new();
let external_public_xkey = external_secret_xkey.as_public(&secp).unwrap();
let internal_public_xkey = internal_secret_xkey.as_public(&secp).unwrap();
let signing_external_descriptor = descriptor!(wpkh(external_secret_xkey)).unwrap();
let signing_internal_descriptor = descriptor!(wpkh(internal_secret_xkey)).unwrap();
let watch_only_external_descriptor = descriptor!(wpkh(external_public_xkey)).unwrap();
let watch_only_internal_descriptor = descriptor!(wpkh(internal_public_xkey)).unwrap();
// create client for Blockstream's testnet electrum server
let blockchain =