sign method

@override void sign()

Implementation

@override
void sign() {
  final message = txData.solanaTransaction.message;
  final Uint8List serializedMessage = message.serialize().asUint8List();
  txData.message = dynamicToString(serializedMessage);
  txData.signature = wallet.sign(txData.message);
  txData.isSigned = true;
  txData.solanaTransaction.signatures[0] = txData.signature.toUint8List();
}