A simple banking application based on blockchain technology.

This is a banking application that allows users to deposit and withdraw ethers using a crypto wallet.

The objective of this project is to help developers understand the basics of smart contracts, payable functions, deploying a smart contract to a test network, creating a react frontend application, how to interact with the deployed smart contract through our frontend application, and how to host the frontend application atlast.

Why build this project?

A while ago when I wanted to build a similar project, I noticed a lack of resources available to guide through the above mentioned concepts. It took me a while to figure out all these things from various sources and get them to work. So I wanted to build a simple application that might help someone to get started and understand these concepts easily.

How to run this project?

• Clone this repository to your PC.

• Navigate to the cloned repo and run

  npm install
  

  Assuming you have node.js installed. If now install from here.

• Go to Alchemy.

  • Signup if you do not have an account already.
  • Create a new app

  

  Make sure to select Staging, Ethereum and Rinkeby in respective fields.

• Go to Metamask and download it to your browser. Follow the instructions to create an account.

• Once you have your metamask wallet ready, go to rinkeby faucet and follow their instructions to get some test ethers.

• Now create a .env file in the root directory and add

  ALCHEMY_API_URL = <YOUR_ALCHEMY_APP_API_URL>
  RINKEBY_PRIVATE_KEY = <YOUR_PRIVATE_KEY>
  

  You can get the alchemy api url from the app you created earlier, copy the http version.

  And you can get the private key from metamask as shown here. This is needed to deploy our contract to the test network. Private Key is a very sensitive information, so make sure not to reveal it to anyone.

• Once you have them in place, now it's time to compile our smart contract. Run the following command.

  npx hardhat compile
  

• Now we'll deploy our smart contract to rinkeby test network.

  npx hardhat run ./scripts/deploy.js --network rinkeby

  Before running the above command, make sure you have received your test ethers to your account or else it will through an error saying insufficient fund.

• Now switch to frontend dir.

  cd frontend
  

• Install packages

  npm install
  

• Now create a .env file in the frontend directory and add

  REACT_APP_ALCHEMY_KEY = <YOUR_ALCHEMY_APP_API_URL>
  

  Use the same API Key as above.

• Run the app.

  npm start
  

  If you followed all the above instructions properly, the app should now run on localhost.

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This project is also hosted here, take a look.

This project is intented to help people getting started, understand the full stack process of developing a DApp. I have written a blog series explaining the whole process. If you're interested here is the link to the series.