isValidSignature method

Future<bool> isValidSignature(String signature, Uint8List nonce)

Verifies the signature returned by Phantom Wallet.

• We will verify the signature with nonce and userPublicKey.

Implementation

Future<bool> isValidSignature(String signature, Uint8List nonce) async {
  Uint8List hashedNonce = Hash.sha256(nonce);
  var message =
      "Sign this message for authenticating with your wallet. Nonce: ${base58encode(hashedNonce)}";
  var messageBytes = message.codeUnits.toUint8List();
  var signatureBytes = base58decode(signature);
  bool verify = await verifySignature(
    message: messageBytes,
    signature: signatureBytes,
    publicKey: Ed25519HDPublicKey.fromBase58(userPublicKey),
  );
  nonce = Uint8List(0);
  return verify;
}