  function setSafeManager(address _safeManager) external onlyGovernor {
    _setSafeManager(_safeManager);
  }
  function _setSafeManager(address _safeManager) internal nonZero(_safeManager) {
    safeManager = IODSafeManager(_safeManager);
  }
  function openSAFE(bytes32 _cType, address _usr) external returns (uint256 _id) {
   //some code...

    ++_safeId;

   //some code...

    vault721.mint(_usr, _safeId);

    //some code...
  }
function mint(address _proxy, uint256 _safeId) external {
    require(msg.sender == address(safeManager), 'V721: only safeManager');
    require(_proxyRegistry[_proxy] != address(0), 'V721: non-native proxy');
    address _user = _proxyRegistry[_proxy];
    _safeMint(_user, _safeId);
  }
