We built a Coinflip PoC using multiparty contracts on Ark! Bonus points: it uses Nostr on the backend. Ark's client-server architecture, built around presigned transactions, provides an interesting framework for coordinating complex multi-party interactions. A key insight from our Coinflip implementation: Ark operators validate spending conditions off-chain, such that in the optimistic case, complex validation logic doesn't hit the blockchain at all. Once the game concludes, players settle their balance without intermediary trust. It's available here: Coinflip is available here:

CoinFlip

Bitcoin-powered coin flipping game

Check it out! 👾