private PrivateKey ChildKeyDerive(byte[] keyPath)
{
byte[] childKey;
byte[] childChainCode;
byte nonce = 0;
do
{
List <byte> bytes = new List <byte>();
bytes.AddRange(Bytes);
bytes.AddRange(keyPath);
bytes.AddRange(ChainCode);
bytes.Add(nonce++);
byte[] keyAndChainCode = HashProvider.Hash512(bytes.ToArray());
childKey = keyAndChainCode.Left();
childChainCode = keyAndChainCode.Right();
} while (!Secp256k1.SecretKeyVerify(childKey));
return(new PrivateKey(childKey, childChainCode));
}