func: function addSideService(address _service, uint _block) public returns (uint _code) {
          if (sideServices[_service]) {
              return SERVICE_CONTROLLER_SERVICE_EXIST;
          }
          _code = _multisig(keccak256(_service), _block);
          if (OK != _code) {
              return _code;
          }
  
          sideServices[_service] = true;
          uint _count = sideServicesCount + 1;
          index2sideService[_count] = _service;
          sideService2index[_service] = _count;
          sideServicesCount = _count;
  
          return OK;
      }