Derive address using ``RIPEMD160(SHA512(x))``

def derivesha512address(self):
        """ Derive address using ``RIPEMD160(SHA512(x))`` """
        pkbin = unhexlify(repr(self._pubkey))
        addressbin = ripemd160(hexlify(hashlib.sha512(pkbin).digest()))
        return Base58(hexlify(addressbin).decode('ascii'))