Hrm...apparently the "proof" that the game was played is the combination of the player's input record plus the need to submit the proof immediately after the ga

Hrm...apparently the "proof" that the game was played is the combination of the player's input record plus the need to submit the proof immediately after the game ends (so that the timestamp of the commit is within a few seconds of when the game would have ended according to the input). Disregarding writing bots to play the game, the first cheat that comes to mind is locally speeding the game up 25%, building up an ever-growing rewind buffer, and then giving the cheating player a "back up a few seconds" button to undo some input at the cost of their buffer.