func: function _airDrop(MobiusRound storage rnd, uint value) internal {
          require(msg.sender == tx.origin, "ONLY HOOMANS (or scripts that don't use smart contracts)!");
          if(value > 100 finney) {
              
              uint chance = uint(keccak256(abi.encodePacked(blockhash(block.number - 1), now)));
              if(chance % 200 == 0) {
                  uint prize = rnd.airdropPot / 2;
                  rnd.airdropPot = rnd.airdropPot / 2;
                  vaults[msg.sender].totalReturns = add(vaults[msg.sender].totalReturns, prize);
                  unclaimedReturns = add(unclaimedReturns, prize);
                  totalJackpotsWon += prize;
                  emit AirdropWon(msg.sender, prize);
              }
          }
      }