This the blockchain project that sold 3K+ NFTs in 4 hours on Ethereum using JavaScript and Solidity. OPENSEA SeatBelt On!

on testnet rinkeby: https://rinkeby.etherscan.io/address/0xf49a30a3205E9E1f1AC748481f26BAeD344Fb3A9

use package hardhat...

once install packga "hardhat-shorthand", we can replace "hardhat" in cml by "hh"

1. yarn install
2. set your .env file
3. check the network settings in hardhat.config.js

• all contract

  // assign network
  yarn hardhat deploy --network rinkeby
  
  // local network
  yarn hardhat deploy
  

• specific contract

  // tags decide in ./depoly/deploy.js
  yarn hardhat deploy --network rinkeby --tags "XXX"
  

Normally, it would verify automatically when deploy
If not, can run

• without argument

  yarn hardhat verify --network rinkeby "CONTRACT_ADDRESS"
  

• with argument first create an argument.js file

  yarn hardhat verify --network rinkeby --constructor-args arguments.js "CONTRACT_ADDRESS"
  

At the same time, can get the gas report

yarn hardhat test

• IPFS use filebase
• composite image HashLips/hashlips_art_enginePublic

Sructure

• The more often use function, put more ahead
• Replace if-else by ?:, and put easier fire situation into if statement

Function using

• Not override tokenURI(), by get rid of ".json" for each filename
• Use merkle tree, not array mapping
• Don't use totalSupply() from ERC721Enumerable.sol, which needs 2 override function, and cost 400000 gas more.
• Import Ownable.sol, not write on my own
• Less math calculate

yarn hardhat clean