@unchainedshop/plugins/lib/payment/cryptopay/derive-btc-address.js

Official plugin collection for the Unchained Engine with payment, delivery, and pricing adapters

import { HDKey } from '@scure/bip32';
import { NETWORK, p2wpkh, TEST_NETWORK } from '@scure/btc-signer';
const resolveNetwork = (prefix) => {
    if (['x', 'y', 'z'].includes(prefix))
        return NETWORK;
    return TEST_NETWORK;
};
export default (xpub, index) => {
    const prefix = xpub.slice(0, 1);
    if (prefix !== 'z' && prefix !== 'v')
        throw new Error('Cryptopay only supports native segwit (zpub/vpub) extended key format for BTC');
    const hardenedMaster = HDKey.fromExtendedKey(xpub, prefix === 'z'
        ? {
            public: 0x04b24746,
            private: 0x04b2430c,
        }
        : {
            public: 0x045f1cf6,
            private: 0x045f18bc,
        });
    hardenedMaster.wipePrivateData();
    const child = hardenedMaster.deriveChild(0).deriveChild(index);
    if (!child.publicKey)
        throw new Error('Cannot derive public key from extended public key');
    const network = resolveNetwork(prefix);
    const pubKey = p2wpkh(child.publicKey, network);
    return pubKey.address;
};