code: def _verify(self, rj, token):
          
          keys = self.key_jar.get_jwt_verify_keys(rj.jwt)
          return rj.verify_compact(token, keys)
docs: Verify a signed JSON Web Token
  
          :param rj: A :py:class:`cryptojwt.jws.JWS` instance
          :param token: The signed JSON Web Token
          :return: A verified message