NFT Minting from Celo to Ethereum Using Chainlink CCIP

This project demonstrates how to mint an NFT on the Sepolia network from the Celo Alfajores testnet using Chainlink's Cross-Chain Interoperability Protocol (CCIP).

Overview

The project includes three main smart contracts:

• SourceMinter: Deployed on Celo Alfajores, sends cross-chain mint requests.
• DestinationMinter: Deployed on Sepolia, receives cross-chain mint requests and triggers the minting process.
• CeloNFT: Deployed on Sepolia, the actual NFT contract.

Prerequisites

• Node.js and npm installed
• Hardhat installed
• A wallet with testnet funds on both Alfajores and Sepolia
• Chainlink tokens for transaction fees on Alfajores (available from the Chainlink Faucet)

Setup

• Clone the repository and navigate to the project directory.

• Install dependencies:

cd packages/hardhat
npm install

• Create a .env file from the template and fill in your private key and API keys:

cp .env.template .env

Edit the .env file and add your details:

PRIVATE_KEY="your-private-key"
CELOSCAN_API_KEY="your-celoscan-api-key"
ETHERSCAN_API_KEY="your-etherscan-api-key"

Deployment

• Deploy SourceMinter on Alfajores

Run the deployment script:

npx hardhat run scripts/1.deploy.source.alfajores.js --network alfajores

Copy the deployed contract address and add it to addresses.txt under SourceMinter (alfajores).

• Deploy CeloNFT on Sepolia

Run the deployment script:

npx hardhat run scripts/2.deploy.celonft.sepolia.js --network sepolia

Copy the deployed contract address and add it to addresses.txt under CeloNFT (Sepolia).

• Deploy DestinationMinter on Sepolia

Update the celoNFTAddress variable in scripts/3.deploy.destination.sepolia.js with the address of the deployed CeloNFT contract. Then run the deployment script:

npx hardhat run scripts/3.deploy.destination.sepolia.js --network sepolia

Copy the deployed contract address and add it to addresses.txt under DestinationMinter (Sepolia).

• Transfer Ownership of CeloNFT

Update the newOwner variable in scripts/4.transfer-ownership.sepolia.js with the address of the deployed DestinationMinter contract. Then run the script:

npx hardhat run scripts/4.transfer-ownership.sepolia.js --network sepolia

Note

After transferring ownership, ensure you send LINK tokens to the SourceMinter contract. These tokens will be used to pay the fees for CCIP transactions.

• Mint an NFT from Alfajores

Update the necessary variables in scripts/5.mint-nft.alfajores.js from addresses.txt, then run the script to mint an NFT:

npx hardhat run scripts/5.mint-nft.alfajores.js --network alfajores

Notes

• Ensure you have enough LINK tokens in your wallet on the Alfajores network for the cross-chain fee. You can get test LINK tokens from the Chainlink Faucet.
• Keep track of your contract addresses in the addresses.txt file for reference during interactions.