Mathematically Prohibiting 'Cheating' in On-Chain RPS: A Midnight ZK dApp Case Study

Introduction Implementing Rock-Paper-Scissors (RPS) on-chain is surprisingly tricky. The moment you choose "Rock" and send a transaction, your opponent can read your move from the public ledger. The game is over before it even starts. I tried implementing a commit-reveal pattern manually, but managing salts, preventing front-running, and ensuring fair judging logic... it quickly became a rabbit hole. That's when I turned to Midnight . I built a full-stack RPS dApp where "cheating" (looking at th