Cornell Token

ERC20 token with Solidity, Brownie and Python

Demo

Check out Cornell Token on Rinnkeby network with Etherscan.

Installation

1. Install brownie with pipx

   $ python3 -m pip install --user pipx
   $ python3 -m pipx ensurepath
   $ pipx install eth-brownie
   
   # test installation
   $ brownie 

2. Install ganache-cli with npm

   npm install -g ganache-cli

Create the Project

1. Initialize the project

   $ mkdir cornell_token ; cd cornell_token
   $ brownie init

2. Create token contract in ./contracts/CornellToken.sol

   • inherit ERC20 implementation from OpenZeppelin to avoid re-inventing the wheel.

3. Add ./brownie-config.yaml

   1. create mapping @openzeppelin to the github repo
   2. add other config:
      • dotenv
      • private key of local dev

4. Add .env for the environment variables

   • dotenv -> for private key stuff, as a safer way

5. Change the name of the Token (e.g. CornellToken)

6. Creat deploy script deploy_cornell_token.py

   • define initial supply, token name, token sybol

7. Creat deploy script helper.py

   • get account function

Deploy to local blockchain development environment

$ brownie run scripts/deploy_cornell_token.sol

Deploy to live network

1. in brownie-config.yaml, add:

   networks:
   rinkeby: active

2. in .env, add:

   export WEB3_INFURA_PROJECT_ID=<YOUR INFURA PROJECT ID>
   export PRIVATE_KEY=<YOUR PRIVATE KEY>

   
   To have infura project id, you need to create an infura account and a new project. The id is the endpoint to the live network.
   
   To access your private key, you can check out the metamask -> account details
   
   

3. run the same script with an extra --network option

   $ brownie run scripts/deploy_cornell_token.sol --network rinkeby

   then wait for a moment to see the address being active on the live network.

4. add this token to metamask

   • Metamask -> assets -> import tokens
   • grab the token contract address and add it into metamask.