def is_sha256(content):
        digits58 = ('0123456789ABCDEFGHJKLMNPQRSTUVWXYZ'
                    'abcdefghijkmnopqrstuvwxyz')
        for i in range(len(content)):
            if not content[i] in digits58:
                return False
        return len(content) == 64
Make sure this is actually an valid SHA256 hash.
dataset/ETHPy150Open Storj/dataserv/dataserv/Validator.py/is_sha256