OnchainRiddle Project

This repository is composed of two projects:

• A Hardhat project containing the OnchainRiddle.sol smart contract
• A Next.js project that serves as a front end for interacting with the contract

Key Points

• Here is the contract address on Sepolia (verified): https://sepolia.etherscan.io/address/0x06BC0F3cF252735E8C0AcD7A94577417790A50Fe#readContract
• I chose to generate an address to deploy it and to use it in my "script" (an API endpoint) to set a new riddle.
• I use Wagmi and Viem to generate the whole typing and hooks for the project.
• I had to modify the smart contract to prevent users from submitting an answer that has already been submitted for the riddle.
• I used hooks to listen to the events.
• It took me about 10 hours to do it (in several sessions)

How to Install

Hardhat Project Setup

1. Install dependencies in the Hardhat project
2. Run npx hardhat node to launch a local Hardhat node
3. Deploy OnchainRiddle smart contract to local blockchain using pnpm run deploy
4. The OnchainRiddle smart contract should be at address 0x5FbDB2315678afecb367f032d93F642f64180aa3 (deterministic address)

Note: If you want to deploy the smart contract to Sepolia, you need to add an Alchemy key and a private key to the Hardhat environment variables.

Next.js Project Setup

1. Install dependencies in the Next.js project
2. Run npx wagmi generate to generate typing
3. Create a .env environment file containing:

   NETWORK=hardhat # to connect to local hardhat instance
   PRIVATE_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80 # first account of hardhat used to deploy the SC
   

4. Launch the app with pnpm run dev