namespace
{
	unsigned char zero_hash[32]={
	7, 133, 77, 47, 239, 41, 122, 6,
	186, 129, 104, 94, 102, 12, 51, 45,
	227, 109, 93, 24, 213, 70, 146, 125,
	48, 218, 173, 109, 127, 218, 21, 65
	};
}