BIP-322 JavaScript Library

bip322-js is a TypeScript/JavaScript library providing utility functions for the BIP-322 signature scheme, enabling generic message signing and verification across various Bitcoin address types. It supports P2PKH, P2SH-P2WPKH, P2WPKH, and single-key-spend P2TR addresses on mainnet, testnet, and regtest. The current stable version is 3.0.0, released in April 2025. A key differentiator is its 'Loose BIP-137 Verification' by default, which allows backward compatibility with legacy BIP-137 signatures, even if they have non-standard header flags, by assuming ownership of the private key for all derivable addresses. It also provides functionalities to generate raw `toSpend` and `toSign` BIP-322 transactions.