erc20_token

• This explains how to mint/send/show ERC20 tokens on goerli testnet

• ERC20 Contract https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol

Install nodejs, npm, git

sudo apt install nodejs npm
sudo apt install git

sudo add-apt-repository ppa:ethereum/ethereum
sudo add-apt-repository ppa:ethereum/ethereum-dev
sudo apt update
sudo apt install solchereum/ethereum-dev
sudo apt update
sudo apt install solc

Install brownie and ganache

sudo pip3 install eth-brownie

sudo npm install -g ganache-cli

or

sudo npm install -g ganache

Settings of ethereum goerli testnet

• Insert web3 infura project ID from infura https://infura.io into ***

export WEB3_INFURA_PROJECT_ID='***'

• Inset your private key from your metamask account into ***

export PRIVATE_KEY=***

When you use bloxberg network, please run the following command

brownie networks add Bloxberg bloxberg host=https://core.bloxberg.org chainid=8995

Get ETH of goerli testnet from faucet

• Install Metamask https://metamask.io/ To do this, you can follow the instruction from . (Thanks to Hikaru!)
• Then, get an account address
• Get some ETH from faucent (more than 0.004 ETH is recommended) https://goerlifaucet.com/

git clone

git clone https://github.com/fujihalab/erc20_token.git

Edit contract

cd erc20_token

• Edit token name (default: FujihaLab Token) and symbol (default: FLT) in contracts/MyERC20Token.sol

Test minting tokens using ganache

• Open 1st terminal, then run the following command

$ ganache-cli 

• Open 2nd terminal, then run the following command

brownie run scripts/mint_token.py

Mint token

• Then, run the following command

brownie run scripts/mint_token.py --network goerli

The standard output goes like this:

Brownie v1.18.1 - Python development framework for Ethereum

Compiling contracts...
  Solc version: 0.8.13
  Optimizer: Enabled  Runs: 200
  EVM Version: Istanbul
Generating build data...
 - OpenZeppelin/[email protected]/ERC20
 - OpenZeppelin/[email protected]/IERC20
 - OpenZeppelin/[email protected]/IERC20Metadata
 - OpenZeppelin/[email protected]/Context
 - MyERC20Token

Erc20TokenProject is the active project.

Running 'scripts/mint_token.py::main'...
account: 0x3d5E61c1Bc6e882478ec3b6f814e7C95bEe7928a
Transaction sent: 0x7423851904ac9a15b5a7a16fa316e89315b25965f48fb34f0f5d4e3644892039
  Gas price: 2.500000007 gwei   Gas limit: 703000   Nonce: 6
  MyERC20Token.constructor confirmed   Block: 31509506   Gas used: 639091 (90.91%)
  MyERC20Token deployed at: 0x28E71A57454b0003632adc80279970925aDf96b2

• See Etherscan (Insert corresponding information into *)

https://goerli.etherscan.io/address/*

https://goerli.etherscan.io/tx/*

https://goerli.etherscan.io/token/*

• For example,

https://goerli.etherscan.io/address/0x3d5E61c1Bc6e882478ec3b6f814e7C95bEe7928a https://goerli.etherscan.io/tx/0x7423851904ac9a15b5a7a16fa316e89315b25965f48fb34f0f5d4e3644892039 https://goerli.etherscan.io/token/0x28E71A57454b0003632adc80279970925aDf96b2

Send token

• Edit contract and recipient addresses in script/send_token.py
• Edit the amount of tokens to send in script/send_token.py (default: 100 tokens)
• Then, run the following command

brownie run scripts/send_token.py --network goerli

The standard output goes like this:

Brownie v1.18.1 - Python development framework for Ethereum

Erc20TokenProject is the active project.

Running 'scripts/send_token.py::main'...
Transaction sent: 0x9bb39dbf10843b9c922c1b326a2487305ec9ce4ce0e67fc7dc0cc84078af3e6a
  Gas price: 2.500000007 gwei   Gas limit: 56756   Nonce: 7
  MyERC20Token.transfer confirmed   Block: 31509687   Gas used: 51597 (90.91%)

  MyERC20Token.transfer confirmed   Block: 31509687   Gas used: 51597 (90.91%)

Show token status

• Edit contract and owner addresses in script/show_token_status.py
• Then, run the following command

brownie run scripts/show_token_status.py --network goerli

The standard output goes like this:

Brownie v1.18.1 - Python development framework for Ethereum

Erc20TokenProject is the active project.

Running 'scripts/show_token_status.py::main'...
Token Name = FujihaLab Token
Token Symbol = FLT
Token Decimals = 18
Token Total Supply = 1000000000000000000000000
Token Balance = 999900000000000000000000

Check token using Metamask

• Import tokens --> Insert token import address --> Add custom token --> Import tokens

https://www.followchain.org/add-custom-token-metamask/