BitGo abstract-utxo

This module provides the foundational AbstractUtxoCoin class and concrete implementations for Bitcoin and Bitcoin-like UTXO-based cryptocurrencies within the BitGo platform.

Overview

The AbstractUtxoCoin class serves as the base implementation for all UTXO-based coins, providing common functionality for transaction building, signing, verification, and recovery operations. Each supported cryptocurrency extends this class to provide coin-specific behavior while leveraging the shared UTXO infrastructure.

Supported Coins

Concrete implementations are provided in the src/impl/ directory:

• btc/ - Bitcoin (BTC) and Bitcoin testnet variants
• bch/ - Bitcoin Cash (BCH)
• bcha/ - Bitcoin Cash ABC (BCHA)
• bsv/ - Bitcoin SV (BSV)
• btg/ - Bitcoin Gold (BTG)
• ltc/ - Litecoin (LTC)
• dash/ - Dash (DASH)
• doge/ - Dogecoin (DOGE)
• zec/ - Zcash (ZEC)

Key Features

Transaction Operations

• Building & Signing: Support for both legacy and PSBT transaction formats
• Multi-signature: 2-of-3 multisig with various script types (P2SH, P2WSH, P2SH-P2WSH, P2TR-MuSig2)
• Verification: Comprehensive transaction intent verification before signing
• Explanation: Decode and explain transaction details (inputs, outputs, fees)

Wallet Types

• Fixed Script Wallets: Traditional HD wallets with deterministic address generation
• Descriptor Wallets: Modern wallet format using output script descriptors
• Distributed Custody: Support for enterprise custody configurations

Address Management

• Address validation and derivation verification
• Support for multiple address formats (base58, bech32, cashaddr for BCH)
• Chain/index-based address generation for fixed script wallets

Recovery Operations

• Backup Key Recovery: Recover funds using backup key when BitGo is unavailable
• Cross-Chain Recovery: Recover coins sent to wrong chain (e.g., BTC sent to LTC address)
• V1 Wallet Recovery: Support for legacy V1 wallet recovery

Advanced Features

• BIP322 message signing support
• MuSig2 for Taproot multisig
• Replay protection for chain splits
• Custom change address handling
• RBF (Replace-by-Fee) transaction support

Development Setup

VSCode Configuration

For an optimal development experience in VSCode, configure the Mocha Test Explorer with the following settings in .vscode/settings.json:

{
  "mochaExplorer.files": "test/**/*.ts",
  "mochaExplorer.nodeArgv": ["--import", "tsx"],
  "mochaExplorer.logpanel": true
}

This configuration enables:

• Test Discovery: Automatically finds all TypeScript test files in the test/ directory
• TypeScript Support: Uses tsx for running TypeScript tests without compilation
• Log Panel: Displays test output for easier debugging

Running Tests

With the Mocha Test Explorer configured, you can:

• View and run individual tests or test suites from the VSCode Test Explorer panel
• Set breakpoints and debug tests directly in the editor
• Monitor test output in the integrated log panel