Chainlink-bootcamp-day3

The Demo codes for CCIP cross-chain NFT use case.

Instructions

1. Get ETH tokens on Ethereum Sepolia testnet from Chainlink Faucets.

2. Get AVAX and LINK tokens on Avalanche Fuji testnet from Chainlink Fuji Faucet

3. Open Remix online IDE.

4. Swtich metamask to Sepolia testnet.

5. Deploy the smart contract MyNFT.sol on Sepolia testnet.

6. Get the address of MyNFT.sol.

7. Deploy the smart contract DestChainReceiver.sol on Sepolia testnet with address of MyNFT.sol and CCIP Sepolia router address. You can find the address here.

8. Switch metamask to Avalanche Fuji network, and find the RPC info here if you do not have the network in you metamask.

9. Deploy the smart contract SourceChainMinter.sol on Avalanche Fuji testnet. You will need deploy with CCIP Fuji router address and LINK token Address on Fuji.

10. Transfer 2 AVAX and 3 LINK tokens to SourceChainMinter.sol.

11. Call function sendMessage to mint NFT with AVAX tokens as gas fee. Parameters are as follow:

    1. destinationChainSelector: find ChainSelector for Sepolia here.
    2. receiver: this is the address of DestChainReceiver.sol in step 6.
    3. feeToken: select 0 to pay AVAX for gas fee.

12. Call function sendMessage to mint NFT with LINK tokens as gas fee. Parameters are as follow:

    1. destinationChainSelector: find ChainSelector for Sepolia here.
    2. receiver: this is the address of DestChainReceiver.sol in step 6.
    3. feeToken: select 1 to pay LINK for gas fee.

13. Head to Opensea testnet to check your minted NFT. You will find 2 NFT collected under your profile

Smart contracts

• MyNFT.sol: ERC-721 smart contract.
• DestChainReceiver.sol: Receive message from Chainlink CCIP on destination chain.
• SourceChainMinter.sol: Send mint message to Chainlink CCIP on source chain.

Tips

• Please use Avalanche Fuji as source chain since the source finalized faster than others.
• You can choose Polygon Mumbai and Ethereum Sepolia as destination chain since the NFT can be displayed on Opensea testnet.
• Ask Frank if you cannot get the test tokens.

Certificate

• If you complete the CCIP steps above, let Frank know and you can get a gift and NFT certificate.