private static byte[] signTransaction2Byte(byte[] transaction, byte[] privateKey)
{
ECKey ecKey = ECKey.FromPrivate(privateKey);
Transaction transaction1 = Transaction.Parser.ParseFrom(transaction);
byte[] rawdata = transaction1.RawData.ToByteArray();
byte[] hash = Sha256Keccak.Hash(rawdata);
byte[] sign = ecKey.GetSignature(hash);
Transaction clone = transaction1.Clone();
clone.Signature.Add(ByteString.CopyFrom(sign));
return(clone.ToByteArray());
}