CrossChainPriceNFT Comprehensive Guide

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This guide provides a step-by-step walkthrough for deploying and interacting with the CrossChainPriceNFT smart contract, enabling the creation and management of dynamic NFTs across different blockchain networks. Utilizing Chainlink's Cross-Chain Interoperability Protocol (CCIP), this guide also includes a challenge for deploying on Polygon Mumbai.

Step 1: Initial Setup and Contract Deployment

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MetaMask & Network

• Ensure MetaMask is set to the Sepolia network.

Remix IDE

• Open Remix IDE.
• Navigate to "DEPLOY & RUN TRANSACTIONS" and select "Injected provider - MetaMask" as the environment.
• Confirm you're on the Sepolia (11155111) network.

Contract Preparation

• In "FILE EXPLORER", create a new file named CrossChainPriceNFT.sol.
• Copy the provided Solidity contract code into this file.

Deployment

• Deploy the CrossChainPriceNFT contract via Remix, using the specified constructor arguments.

Step 2: Minting and Viewing Your NFT

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Collection on OpenSea

• Navigate to OpenSea testnets.
• Search for your CrossChainPriceNFT contract address to view your collection.

Minting NFTs

• Back in Remix, under the CrossChainPriceNFT contract, use the mint function with your wallet address.

CrossDestinationMinter Contract

• Create a new file named CrossDestinationMinter.sol in Remix.
• Copy the respective Solidity code into this file and deploy on the Sepolia network.

Step 3: Testing Cross-Chain Functionality

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Tests

• Run the testMint and testMessage functions from your deployed CrossDestinationMinter contract.

Switch Networks

• In MetaMask, switch to the Avalanche FUJI network.
• Verify the network change in Remix to Custom (43113).

CrossSourceMinter Contract

• Create and deploy the CrossSourceMinter.sol contract on FUJI, inputting the CrossDestinationMinter address as a parameter.

Step 4: Cross-Chain Minting and Link Token Transfer

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Send LINK Tokens

• Add LINK tokens to MetaMask for the FUJI network using the provided address.
• Transfer 5 LINK to your CrossSourceMinter address.

Minting Across Chains

• Use the mintOnSepolia function to mint an NFT from the FUJI network to Sepolia.
• Confirm the transaction ID via the CCIP Explorer.

Step 5: Mint from Polygon Mumbai

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Setup Mumbai on MetaMask

• Add Mumbai Network following instructions on Chainlist or manually with the specified details.

Add LINK Token on Mumbai

• Add LINK token to your wallet using the LINK token contract for Mumbai.

Get LINK from Faucet

• Obtain LINK tokens from the Mumbai faucet.

Deploy CrossSourceMinterMumbai Contract

• Create a new file CrossSourceMinterMumbai.sol in Remix and paste the provided code.
• Deploy, setting the CrossDestinationMinter address (from Sepolia) as a parameter.

Step 6: Minting and Funding

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Send LINK to CrossSourceMinterMumbai

• Transfer 5 LINK to your CrossSourceMinterMumbai address on MetaMask.

Check Balance and Mint

• Verify LINK balance in Remix and use the mintOnSepolia function to mint an NFT from Mumbai to Sepolia.

Step 7: Review and Verification

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Review on CCIP Explorer

• Verify the cross-chain minting operation on CCIP Explorer.

View Your NFT on OpenSea

• Your new NFT should be visible on OpenSea Testnets upon successful minting.

Watch the Tutorial

For a detailed walkthrough of this project, watch our YouTube tutorial.

Resources

• Chainlink CCIP Supported Networks
• Chainlink Data Feeds
• LINK Token Contracts