My plan is to have a Put/Call game on top of a Bitcoin Casino's Bankroll. The Casino already has a house edge of 1%. So a user can guess if it will rise or fall after a certain amount of games have been played on the Casino. Then the payout is adjusted accordingly. So if they call the bankroll they will make less profit since they're more likely to win by doing so. If I'm right it is not possible to cheat in this game or manipulate it without losing. For example is somebody tries to cheat by doing this: - Bankroll is 100 BTC - Player calls the bankroll for 2 BTC - Bankroll is now at 102 BTC - Player loses 1 BTC on purpose - Bankroll is now at 101 BTC - Player is now even more likely to lose A friend however tells me it is still prone to manipulation because somebody could make small bets at the same number and then a bigger one, I didn't quite understand him but you might. I said I don't think it will work because the casino still has a house edge of 1% and so they'd likely be losing anyway. Is this game prone to manipulation in a way that makes it more likely for a player to win than lose even if they lose money (BTC) in the process?