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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

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

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

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

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

Setup Mumbai on MetaMask

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

Add LINK Token on Mumbai

Get LINK from 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

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

Review on CCIP Explorer

View Your NFT on OpenSea

Watch the Tutorial

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

Resources