NFT whitelist

NFT whitelist showcases two methods for granting whitelists to users in the context of NFTs. It also utilizes secure random number generators provided by ChainLink VRF to mint NFTs randomly.

• Website Link
• NFT Backend code
• This NFT is deployed on Arbitrum Sepolia testnet

Main Features

• Efficient Gas Usage: Save whitelists in a Merkle tree to reduce gas costs.
• Flexible Whitelist Issuance: Issue whitelists to users with EIP-191 signatures.
• Tamper-Proof RNG: Utilize ChainLink VRF to prevent manipulation of the random number generator by hackers.

Smart contract Technique

• Merkle tree
• EIP-191 signature
• ChainLink VRF
• ERC721

Backend Technique

• Ethers.js
• Express.js
• Openzeppelin/merkle-tree

Demo

• Mint by signature

• Mint by proof (Merkle tree)

How to start my project

• Claim ETH and $Link from Alchemy and Chainlink.
• Fill in .env (private key, arbitrum sepolia rpc url, etherscan api key).
• Run generate_merkle_tree.js to calculate a root value.
• Create VRF2.5 subscription and get subscription id.
• Change parameters of constructor in script/NFT.s.sol.
• Install foundry.
• Run: forge install smartcontractkit/chainlink
• Run: forge install OpenZeppelin/openzeppelin-contracts
• Run: source .env
• Run: forge script script/NFT.s.sol:NFTScript --rpc-url $SEPOLIA_RPC_URL --broadcast --verify -vvvv
• Add the consumer (address of the NFT just deployed) to your subscription.