@unisat/wallet-utils/es/utils.js

UniSat Wallet Utils

import bitcore from "bitcore-lib";
export function verifyMessage(publicKey, text, sig) {
  var message = new bitcore.Message(text);
  var signature = bitcore.crypto.Signature.fromCompact(Buffer.from(sig, "base64"));
  var hash = message.magicHash();

  // recover the public key
  var ecdsa = new bitcore.crypto.ECDSA();
  ecdsa.hashbuf = hash;
  ecdsa.sig = signature;
  var pubkeyInSig = ecdsa.toPublicKey();
  var pubkeyInSigString = new bitcore.PublicKey(Object.assign({}, pubkeyInSig.toObject(), {
    compressed: true
  })).toString();
  if (pubkeyInSigString != publicKey) {
    return false;
  }
  return bitcore.crypto.ECDSA.verify(hash, signature, pubkeyInSig);
}