Letters for the future - a decentralized application (dapp) where you send messages to the world of the future, your messages will be permanently stored on the blockchain.

Smart contract deployed on Goerli testnet: 0x089FC8Af90891508F5826d55daee98f566553626

Web Application deployed on Vercel: https://letter3.vercel.app/

Get goerli test: https://faucets.chain.link/

• Add message
• Identify your message
• Pagination
• Scan transaction
• Detecting network and account changes

• Hardhat framework (Write, test and deploy smart contract)
• Solidity 0.8.0
• Chai (Test smart contract)
• Reactjs (Use function component)
• Bootstrap (UI)
• Firebase (Use to save transactions)
• Etherjs
• Vercel (Deploy web app)
• Quicknode, Goerli (Deploy smart contract)

1. cd smart-contract
2. npm install

• Deploy smart contract (local)

1. npx hardhat node (keep terminal run, import accounts to metamask)
2. npx hardhat run scripts/deploy.js --network localhost (open another terminal)

• Deploy smart contract (Goerli testnet)

1. Create .env file and add:
   QUICKNODE_API_KEY_URL: "goerli-network-endpoint-from-quicknode"
   GOERLI_PRIVATE_KEY: "account-private-key"
2. npx hardhat run scripts/deploy.js --network goerli

1. cd application
2. npm install
3. Add .env in application/src/ and add firebase config:
   REACT_APP_FBC_APIKEY=
   REACT_APP_FBC_AUTHDOMAIN=
   REACT_APP_FBC_PROJECTID=
   REACT_APP_FBC_STORAGEBUCKET=
   REACT_APP_FBC_MESSAGINGSENDERID=
   REACT_APP_FBC_APPID=
   REACT_APP_FBC_MEASUREMENTID=
4. npm start