1. Tải ERC20 contract <a href="https://github.com/ethereum-optimism/Truffle-ERC20-Example/tree/master/contracts" target="_blank">tại đây</a>
2. Sửa file <code>truffle-config.js</code> thế này:

   module.exports = {
       networks: {
           development: {
               host: "localhost",
               port: 8545,
               network_id: "*",
               gas: 0,
               from: "0x3c31b4b9d6c24bad29498f99aaa6914231362c7f"
           }
       },
       compilers: {
           solc: {
               version: "0.7.6" 
           }
       }
   };
   

3. Sửa file <code>1_initial_migration.js</code> thế này:

   const ERC20 = artifacts.require("ERC20");
   
   module.exports = function (deployer) {
       const tokenName = 'My First Coin';
       const tokenSymbol = 'MFC';
       const tokenDecimals = 1;
       
       deployer.deploy(
           ERC20, 
           10000, 
           tokenName, 
           tokenDecimals, 
           tokenSymbol,
           { gasPrice: 0 }
       );
   };
   

4. Chạy truffle compile
5. Chạy trufle migrate
6. Sau khi đã deploy contract thành công chúng ta sẽ chạy <code>truffle console</code> và gọi thử các lệnh:

   let contract = await ERC20.deployed()
   contract.totalSupply()
   contract.transfer("0xf6de26f382078d34446b133fd54191fe49c77273", 1000)
   contract.balanceOf("0xf6de26f382078d34446b133fd54191fe49c77273")
   

truffle(development)> contract.totalSupply()
BN {
  negative: 0,
  words: [ 10000,  ],
  length: 1,
  red: null
}
truffle(development)> contract.transfer("0xf6de26f382078d34446b133fd54191fe49c77273", 1000)
....
truffle(development)> contract.balanceOf("0xf6de26f382078d34446b133fd54191fe49c77273")
BN {
  negative: 0,
  words: [ 1000,  ],
  length: 1,
  red: null
}