rustywallet-coinjoin

CoinJoin and PayJoin (BIP78) utilities for rustywallet.

Features

• PayJoin (BIP78): Sender and receiver PayJoin protocol
• CoinJoin Building: Create CoinJoin transactions with equal outputs
• Output Mixing: Shuffle and equalize outputs for privacy
• Coordinator-less: P2P CoinJoin without central coordinator

Installation

[dependencies]
rustywallet-coinjoin = "0.1"

Quick Start

PayJoin (BIP78)

use rustywallet_coinjoin::prelude::*;

// Receiver creates PayJoin request
let receiver = PayJoinReceiver::new(receiver_address, amount);
let request = receiver.create_request(&original_psbt)?;

// Sender processes PayJoin
let sender = PayJoinSender::new();
let payjoin_psbt = sender.process_request(&request, &sender_utxos)?;

CoinJoin Transaction

use rustywallet_coinjoin::prelude::*;

// Create CoinJoin with equal outputs
let mut builder = CoinJoinBuilder::new();
builder.add_participant(inputs1, output_address1);
builder.add_participant(inputs2, output_address2);

let coinjoin_tx = builder.build(output_amount)?;

BIP78 PayJoin

PayJoin improves privacy by having the receiver contribute inputs:

1. Sender creates original PSBT
2. Receiver adds their inputs and adjusts outputs
3. Both parties sign
4. Transaction looks like regular payment

CoinJoin

CoinJoin combines multiple users' transactions:

• Equal output amounts break amount correlation
• Multiple inputs from different users
• Shuffled outputs hide ownership

Security

• Verify all inputs before signing
• Use equal output amounts
• Randomize output order
• Validate fee calculations

License

MIT