public byte[] ToBytes()
{
byte[] blockHashBytes = BlockHash.ToBytes();
byte[] filterBytes = Filter is null ? new byte[0] : Filter.ToBytes();
byte[] filterLengthBytes = BitConverter.GetBytes(filterBytes.Length);
byte[] buffer = new byte[blockHashBytes.Length + filterLengthBytes.Length + filterBytes.Length];
Buffer.BlockCopy(blockHashBytes, 0, buffer, 0, blockHashBytes.Length);
Buffer.BlockCopy(filterLengthBytes, 0, buffer, blockHashBytes.Length, filterLengthBytes.Length);
Buffer.BlockCopy(filterBytes, 0, buffer, blockHashBytes.Length + filterLengthBytes.Length, filterBytes.Length);
return(buffer);
}