Basic Smart Contract Hardhat Project

This project was created to research about smart contracts on Solidity to be deployed and executed in Mumbai testnet and Polygon mainet.

It uses Hardhat, OpenZeppelin, Alchemy... etc.

Assumes you have installed nodejs and npm

Getting Started

Start Hardhat Project

Create a new directory and install hardhat

mkdir NFTutorial
cd NFTutorial
npm install --save-dev hardhat

We recommend reviewing the hardhat documentation and tutorial.

Next, start a hardhat project

npx hardhat

Select "Create a sample hardhat project". You can say yes to everything.

Now you have a hardhat project ready to go!

Write NFT Contract Code or copy ThreeDigitals.sol and rename de Collection

First, install Open Zeppelin contracts

npm install @openzeppelin/contracts

Install waffle, ethers dependencies

npm install --save-dev @nomiclabs/hardhat-waffle ethereum-waffle chai @nomiclabs/hardhat-ethers ethers

Install EtherScan

npm install --save-dev @nomiclabs/hardhat-etherscan

Install dotenv

npm install dotenv --save

You can delete Greeter.sol and use ThreeDigitals.sol ( rename de Collection )

Try customizing the solidity code with the name of your NFT if you want.

Compile the contract

To compile the contract, just go

npx hardhat compile

Set up .env file

Copy the .env.example file in this directory to .env (which will be ignored by Git)

cp .env.example .env

Then set each variable on .env:

• MUMBAI_URL: The Alchemy URL to mumbai testnet got from your account.
• MATIC_URL: The Alchemy URL to Polygon mainet (MATIC) got from your account.
• PRIVATE_KEY: Private key of the account being used to deploy contract in polygon mainet.
• POLYGONSCAN_API_KEY: Polygon API Key got from https://polygonscan.com/ website.

Use https://alchemy.com, blockchain developer platform.

Deploy to testnet or mainet

To deploy smart contract to mumbai (Polygon testnet):

npx hardhat  run --network mumbai scripts/deploy.js

To deploy smart contract to Polygon mainet (MATIC):

npx hardhat  run --network matic scripts/deploy.js

Deploy on localhost

First need create a virtual enviroment

npx hardhat node

Deploy smart contract on localhost

npx hardhat  run --network localhost scripts/deploy.js

Verify

When you deploy you can verify your smart contract in polygonscan Chance DEPLOYED_YOUR_NFT_CONTRACT by the smart contract code followed by the fields that the constructor initializes

to Polygon mainet

npx hardhat verify --network matic <DEPLOYED_YOUR_NFT_CONTRACT>

to Polygon mumbai testnet

npx hardhat verify --network mumbai <DEPLOYED_YOUR_NFT_CONTRACT>

Interact with the smart contract (network and local)

Use the Hardhat console

npx hardhat console

Steps to release contract (outdated)

1. contracts > Run test on smart contract
2. generate > Generate X number of NFT images
3. ipfs > Upload these images to ipfs using Pinata. Get CID (i.e. QmTiEQ4LLmaMFpsUTbDJthgnCoPygXmiaXRFU8DvsZvUD2)
4. ipfs > Upload json metadata to Pinata. Get CID
5. contracts > Update deploy.js to set X as max supply and https://ipfs.io/ipfs/<CID> as baseURL
6. contracts > Deploy smart contract
7. polygonscan > Complete form

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