eth coin flip
2 players stake ETH, flip a coin on-chain, winner takes all!
About
CoinFlip dApp is a simple decentralized application where two players connect their Ethereum wallets, each chooses heads or tails, stakes an equal amount of ETH, and the smart contract randomly flips a coin to decide the winner. The winner automatically receives the total pot (minus gas). It’s trustless, transparent, and runs fully on-chain! Perfect as a fun demo for simple escrow + randomness logic.
How it's made
Smart Contract: Built in Solidity, deployed with Hardhat. Uses pseudo-randomness (for demo — use Chainlink VRF for mainnet!). Uses ReentrancyGuard for basic security. Frontend: Built with Next.js, React, Wagmi, and Viem. Connect wallets using MetaMask Connector. Users pick sides, stake ETH, and call joinGame. Shows live status, transaction confirmations, and winner info. Network: Deploy on Ethereum Sepolia testnet (or Goerli, or local Hardhat). Easily extendable for real randomness and multi-room support.