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Exercise 4: Create Your Own Tokens

Create, Test, and Deploy Your ERC‑20 Contract on Anvil

  • Initialize a Foundry project. 
    forge init erc20
cd erc20
  • Install OpenZeppelin 
    forge install OpenZeppelin/openzeppelin-contracts --no-commit
  • Move src/Counter.sol elsewhere (e.g., the orig folder).
  • Move test/Counter.t.sol elsewhere (e.g., the orig folder).
  • Move test/Counter.s.sol elsewhere (e.g., the orig folder).
  • code .
  • Copy the contract file from /smart_contracts/code/solidity/erc20/src/MyToken.sol to your src folder.
  • Copy the test script file from /smart_contracts/code/solidity/erc20/test/MyToken.t.sol to your test folder.
  • Copy the deployment script file from /smart_contracts/code/solidity/erc20/script/MyToken.s.sol to your script folder.
  • anvil
  • Build the contract. 
    forge build
  • Test the contract. 
    forge test -vv
  • Deploy the contract using command (and using your private key). 
    forge create src/MyToken.sol:MyToken --rpc-url http://127.0.0.1:8545 --private-key 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80 --broadcast --constructor-args "MyToken" "MTK" 1000
  • Alternatively, deploy the contract using deployment script (and using your private key). 
    forge script script/MyToken.s.sol --rpc-url http://127.0.0.1:8545 --private-key 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80 --broadcast
  • Import your tokens into your wallet.
  • Now, you should be able to tranfer your tokens to another account on anvil.

Deploy Your ERC‑20 Contract on Sepolia (an Ethereum Testnet)

  • Prerequisites

    1. Install a MetaMask wallet and generate a new account. (Use THIS account in the follwoing exercise!)
    2. Visit Ethereum Sepolia Faucet to obtain Sepolia ETH (Ethereum test tokens).
      • You can obtain only 0.05 Sepolia ETH per day.
      • If there is any error, try to use another Google account.

  • Select "Sepolia" as your network.

  • For security reasons, do not reveal your private key in commnad line interface. So, set your private key as an environmental varaible.

    export PRIVATE_KEY=<your_private_key>

  • Deploy your ERC-20 contract onto Sepolia. (Your could change the RPC URL to other Sepolia RPC URLs, such as Infura and Alchemy.)

    forge script script/MyToken.s.sol --rpc-url https://ethereum-sepolia-rpc.publicnode.com --private-key $PRIVATE_KEY --broadcast

  • Check the deployed contract on Etherscan Sepolia by typing your contract address.

  • Import your tokens into your wallet.

  • Transfer your tokens to your friends.

  • Set your contract address as an environmental varaible.

    export CONTRACT_ADDRESS=<your_contract_address>

  • Query the supply of your tokens.

    cast call $CONTRACT_ADDRESS "totalSupply()(uint256)" --rpc-url https://ethereum-sepolia-rpc.publicnode.com

  • Query your token name.

    cast call $CONTRACT_ADDRESS "name()(string)" --rpc-url https://ethereum-sepolia-rpc.publicnode.com

  • Query your token symbol.

    cast call $CONTRACT_ADDRESS "symbol()(string)" --rpc-url https://ethereum-sepolia-rpc.publicnode.com

  • Query the number of your token decimals.

    cast call $CONTRACT_ADDRESS "decimals()(uint8)" --rpc-url https://ethereum-sepolia-rpc.publicnode.com

  • Mint new tokens. (Change the amount as you wish. But remember to multiply it by the number of decimals.)

    cast send $CONTRACT_ADDRESS "mint(address,uint256)" <recipient_address> 1000000000000000000000 --rpc-url https://ethereum-sepolia-rpc.publicnode.com --private-key $PRIVATE_KEY

  • Transfer tokens. (Change the amount as you wish. But remember to multiply it by the number of decimals.)

    cast send $CONTRACT_ADDRESS "transfer(address,uint256)" <recipient_address> 1000000000000000000000 --rpc-url https://ethereum-sepolia-rpc.publicnode.com --private-key $PRIVATE_KEY

  • Fill in the form.

  • Think: How to move Exercise 3 onto Sepolia?