🚩 🥩 Decentralized Staking App v2 - simpler state logic

This takes the Decentralized Stacking challenge that is part of the speedrun and simplifies the state transition logic.

Instead of having state logic spread across multiple modifiers and state variables, we use a single state variable to track the current state and execute transition logic based on its value.

We define three states for the Staker: Opened, Completed & OpenForWithdrawals.

This state will be manipulated by the event handling logic for each of the three events: stake, execute and withdraw.

This results in easier to reason about logic that is less error prone.

NB: For local dev, we need to generate blocks manually in some cases. Triggering the generateBlocks method from the Debug Contract tab will help with this.

The rest of the description follows.

🦸 A superpower of Ethereum is allowing you, the builder, to create a simple set of rules that an adversarial group of players can use to work together. In this challenge, you create a decentralized application where users can coordinate a group funding effort. If the users cooperate, the money is collected in a second smart contract. If they defect, the worst that can happen is everyone gets their money back. The users only have to trust the code.

🏦 Build a Staker.sol contract that collects ETH from numerous addresses using a payable stake() function and keeps track of balances. After some deadline if it has at least some threshold of ETH, it sends it to an ExampleExternalContract and triggers the complete() action sending the full balance. If not enough ETH is collected, allow users to withdraw().

🎛 Building the frontend to display the information and UI is just as important as writing the contract. The goal is to deploy the contract and the app to allow anyone to stake using your app. Use a Stake(address,uint256) event to list all stakes.

🌟 The final deliverable is deploying a Dapp that lets users send ether to a contract and stake if the conditions are met, then yarn vercel your app to a public webserver. Submit the url on SpeedRunEthereum.com!

⚠️ Test it!

Run yarn test to run the automated testing function. It will test that you hit the core checkpoints. You are looking for all green checkmarks and passing tests!

💾 Deploy your contract! 🛰

📡 Edit the defaultNetwork to your choice of public EVM networks in packages/hardhat/hardhat.config.ts

🔐 You will need to generate a deployer address using yarn generate This creates a mnemonic and saves it locally.

👩‍🚀 Use yarn account to view your deployer account balances.

⛽️ You will need to send ETH to your deployer address with your wallet, or get it from a public faucet of your chosen network.

📝 If you plan on submitting this challenge, be sure to set your deadline to at least block.timestamp + 72 hours

🚀 Run yarn deploy to deploy your smart contract to a public network (selected in hardhat.config.ts)

💬 Hint: You can set the defaultNetwork in hardhat.config.ts to sepolia OR you can yarn deploy --network sepolia.

💬 Hint: For faster loading of your "Stake Events" page, consider updating the fromBlock passed to useScaffoldEventHistory in packages/nextjs/pages/stakings.tsx to blocknumber - 10 at which your contract was deployed. Example: fromBlock: 3750241n (where n represents its a BigInt). To find this blocknumber, search your contract's address on Etherscan and find the Contract Creation transaction line.

🚢 Ship your frontend! 🚁

✏️ Edit your frontend config in packages/nextjs/scaffold.config.ts to change the targetNetwork to chains.sepolia or any other public network.

💻 View your frontend at http://localhost:3000/stakerUI and verify you see the correct network.

📡 When you are ready to ship the frontend app...

📦 Run yarn vercel to package up your frontend and deploy.

Follow the steps to deploy to Vercel. Once you log in (email, github, etc), the default options should work. It'll give you a public URL.

If you want to redeploy to the same production URL you can run yarn vercel --prod. If you omit the --prod flag it will deploy it to a preview/test URL.

🦊 Since we have deployed to a public testnet, you will now need to connect using a wallet you own or use a burner wallet. By default 🔥 burner wallets are only available on hardhat . You can enable them on every chain by setting onlyLocalBurnerWallet: false in your frontend config (scaffold.config.ts in packages/nextjs/)

Configuration of Third-Party Services for Production-Grade Apps.

By default, 🏗 Scaffold-ETH 2 provides predefined API keys for popular services such as Alchemy and Etherscan. This allows you to begin developing and testing your applications more easily, avoiding the need to register for these services.
This is great to complete your SpeedRunEthereum.

For production-grade applications, it's recommended to obtain your own API keys (to prevent rate limiting issues). You can configure these at:

🔷ALCHEMY_API_KEY variable in packages/hardhat/.env and packages/nextjs/.env.local. You can create API keys from the Alchemy dashboard.
📃ETHERSCAN_API_KEY variable in packages/hardhat/.env with your generated API key. You can get your key here.

💬 Hint: It's recommended to store env's for nextjs in Vercel/system env config for live apps and use .env.local for local testing.

📜 Contract Verification

Run the yarn verify --network your_network command to verify your contracts on etherscan 🛰

🏃 Head to your next challenge here.