def calc_hdr_hash(blk_hdr):
#hash1 = hashlib.sha256()
#hash1.update(blk_hdr)
#hash1_o = hash1.digest()
#hash2 = hashlib.sha256()
#hash2.update(hash1_o)
#hash2_o = hash2.digest()
#return hash2_o
pow_hash = gobyte_hash.getPoWHash(blk_hdr)
return pow_hash
def gobytehash(s):
return gobyte_hash.getPoWHash(s)