# pip install pyblake2 base58

from pyblake2 import blake2s
import base58
import binascii

import sys

b2sum = blake2s(sys.argv[1]) # e.g. "/Volumes/ISOIMAGE/discA"
with open(sys.argv[1], "rb") as f:
    v = blake2s(f.read()).digest()
    d = blake2s(v).digest()[-4:]
print base58.b58encode(v+d)