Playce

Playce turns real-world venues into interactive social arenas. Attendees check in inside a geofenced zone, onboard with email via Privy embedded wallets, and instantly claim a personal ENS subname ticket (e.g. you-ethglobal-nyc.playce.eth) their portable onchain identity and pass for the venue. From there they jump into sponsor-skinned mini-games: head-to-head chess on Lichess with staked USDC, or "The 67," a camera-based AR battle where players rep Chainlink, Pyth, or Blink and compete for the pot.

Winners collect soulbound proof-of-presence NFTs and chain-battle badges minted on Base, with cross-chain wins routed over Chainlink CCIP. Rewards reveal as 3D collectibles you can share and gallery-browse. The loop is simple: show up, get your name, play, earn your moment. Fun on the surface, verifiable onchain underneath.

Built with Next.js 16 (App Router) + TypeScript, Tailwind v4, and Framer Motion for a mobile-first arcade UX. Privy provisions embedded wallets on signup; viem/wagmi handle Base mainnet staking and mints.

ENS gives every attendee an identity. On check-in we issue an event-scoped subname off the parent playce.eth (e.g. alice-ethglobal-nyc.playce.eth) through a Durin-style L2 subname registry on Sepolia. The backend minter (which owns the parent name) registers the subname to the user's wallet and writes resolver records: addr points to the attendee, plus tier (GA/VIP) and event text records, entirely gasless for the user. Names resolve live via viem's ENSv2 Universal Resolver, and the app re-resolves each ticket to confirm it points back onchain. A mock fallback keeps the flow working before ENS is configured.

Smart contracts (Foundry): PlaycePass (soulbound venue proofs), StakeEscrow (Blink USDC pots), ChessArbiter + Chainlink CRE workflow polling Lichess results for trust-minimized settlement, and Chainlink CCIP (ProofSender to ProofReceiverPass) for cross-chain win badges when players rep Ethereum vs Arbitrum.

"The 67" uses the device camera + MediaPipe for scoring, with sponsor 3D AR skins via React Three Fiber. Reward reveals are Three.js collectibles. A custom Node/WebSocket server + Redis powers realtime lobbies. Off-chain geofence/game verification feeds a gasless backend minter so users never pay gas, for ENS subnames, proofs, and reward badges alike.

Notable hacks: full demo with mainnet fork to simulate CRE settlement locally (impersonate the DON forwarder, deliver onReport, pay the pot); and a broadcast-settle script for chess payouts before CRE is live on a DON, using custom feeds.