3 ms·

Could you explain more how would it be possible?

• jsnathan 9y ago
  In the example code used, the random number which determines the winner is derived from the previous block hash. Since the lottery-owner determines when the function is run, they could call the function when the previous block hash favors their own bet, or else modify their bet before calling the function.
  • ym705 9y ago
    Yep that is why there is a notice and link about random number generation in the tutorial.
    • renas 9y ago
      try this lottery code instead https://github.com/renasboy/ETHLottery https://github.com/renasboy/ETHLottery
      • rmetzler 9y ago
        Is it correct that the betted value doesn't influence any winning chances? Also, is the last byte of the blockhash function return value guaranteed to be equidistributed?