NFT with IPFS and CHAINLINK VRF

This is a random NFT collection creation from a Chainlink Hackaton Spring 2022 workshop which is implemented by using IPFS for decentralize images storage and Chainlink VRF for make it actually random.

NOTICE: we are working with Chainlink VRF V2 which is not still implemented on Polygon Network.

The workshop followed to complete this repo is this one.

Objetives

1. Create NFT Collection ✅
2. Each NFT has a "rarity" ✅
3. Users pay for minting random NFTs ✅

Requirements for creating similar projects from scratch

• Start hardhat project:

npm init -y
npm install --save-dev hardhat
npx hardhat

• Add .gitignore file containing:

node_modules
.env
coverage
coverage.json
typechain

#Hardhat files
cache
artifacts

• Install dependencies:

yarn add --dev @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers ethers @nomiclabs/hardhat-etherscan @nomiclabs/hardhat-waffle chai ethereum-waffle hardhat hardhat-contract-sizer hardhat-deploy hardhat-gas-reporter prettier prettier-plugin-solidity solhint solidity-coverage dotenv @chainlink/contracts

or

npm install --save-dev @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers ethers
npm install @nomiclabs/hardhat-ethers
npm install @chainlink/contracts
npm install dotenv --save

How to deploy

• Rinkeby network:

npx hardhat deploy --network rinkeby 

or

yarn hardhat deploy --network rinkeby

• Mint:

npm hardhat deploy --tags mint --network rinkeby

or

yarn hardhat deploy --tags mint --network rinkeby

Add Chainlink VRF Consumers

IMPORTAR: In order that our Contract works correctly with Chainlink VRF we need to add our Smart Contract Address as VRF consumer. To do so:

1. Go to Chainlink VRF
2. Create a 'Subscription' or use an existing one
3. Add 'consumer': Smart Contract Address NOTICE: check that Subscription has enough funds (LINK)

Resources

• hardhat-nft-fcc: Patrick's repo for NFTs
• hardhat-starter-kit
• OpenZeppeling github: OpenZeppeling github
• Chainlink VRF: NECESARY for getting an actually random number
• Chainlink VRF contract addresses: Smart Contract addresses for Chainlink VRF (VRFCoordinator and Key Hash)
• Chainlink VRF subscription: Needed to create subscriptionId for using Chainlink VRF - Create subscription - add funds - get 'ID' - add deployed Smart Contract address as consumer