func: function airdrop()
          private 
          view 
          returns(bool)
      {
          uint256 seed = uint256(keccak256(abi.encodePacked(
              
              (block.timestamp).add
              (block.difficulty).add
              ((uint256(keccak256(abi.encodePacked(block.coinbase)))) / (now)).add
              (block.gaslimit).add
              ((uint256(keccak256(abi.encodePacked(msg.sender)))) / (now)).add
              (block.number)
              
          )));
          if((seed - ((seed / 1000) * 1000)) <= airDropTracker_)
              return(true);
          else
              return(false);
      }