🌉 NFT Bridge 🚀

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This repository demonstrates how to create NFTs based on ERC721 standards and how to bridge NFTs from Ethereum (ETH) to Polygon (Matic). The core contract is an ERC721A contract which is an extension of ERC721 smart contract named MetaToken that allows you to mint NFTs on Ethereum and Polygon networks.

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Technologies Used 🤖

• Solidity: The smart contract language used to write the MetaToken ERC721 contract.
• Hardhat: A development environment to compile, deploy, and test smart contracts.
• IPFS: A decentralized storage system used to host NFT images.
• FxPortal: A protocol that facilitates interoperability between different blockchain networks. It provides the infrastructure to bridge assets between Ethereum and Polygon.
• DALL-E DALL-E is a cutting-edge AI model developed by OpenAI that can generate images from textual descriptions. In this project, DALL-E was used to generate the NFT images hosted on IPFS.

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Steps to Mint and Bridge NFTs 🪜

0. Download or clone the project and run npm install to install all the required dependencies.

ℹ️Note
1. Update the ".env" file with your private key 2. Make sure you have some Test-Matic and GoETH in your account for gas fee 3. Update the contractAddress, walletAddress variables inside the scripts before executing them

1. Mint NFTs: Deploy the MetaToken contract to the Goerli Ethereum testnet using npx hardhat run scripts/deploy.js --network goerli and mint NFTs using the npx hardhat run scripts/mint.js --network goerli command. You can specify the number of NFTs that will be minted for an address by modifying the noOfNFTs variable inside "mint.js" script.

2. Upload Images to IPFS: You can use Pinata to upload your folder containing NFT images to IPFS and get the baseURI of your IPFS directory.

3. Approve and Deposit: Approve and deposit your NFTs to the Polygon network using the FxERC721RootTunnel contract. Use npx hardhat run scripts/approveDeposit.js --network goerli for this process.

4. Wait for Completion: Allow some time (approximately 20-30 minutes) for the tokens to appear on your Polygon account after depositing them. You can learn more about how fxportal works here : how fx-portal works

5. Check Balance: To verify the successful bridging of NFTs, use npx hardhat run scripts/getBalance.js --network mumbai to check the number of NFTs associated with an address on Polygon.

Hurray 🥳, you have sucessfully bridged your NFTs from Ethereum to Polygon. Now you can enjoy lower gas fees and faster speeds for your transactions 🙌

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Accessing Image Descriptions 🎨

To explore the textual descriptions associated with each NFT image, you can utilize the npx hardhat run scripts/promptDescription.js --network goerli command after deploying the MetaToken contract.

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Accessing NFT Details 🔍

After successfully minting the NFTs using the MetaToken contract, you can easily access the details of each NFT using the npx hardhat run scripts/nftDescription.js --network goerli command.

The script will display the following details for each NFT:

• The unique identifier of the NFT.
• The textual prompt used to generate the corresponding NFT image using DALL-E.
• The address of the owner of the NFT.
• The URI associated with the NFT.
• The public URL where the NFT image can be viewed on IPFS.

Feel free to change the tokenId variable inside the nftDescription.js script to view the details of different NFTs.

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Acknowledgments 🌟

This project was completed as part of the MetaCrafts assessment.I have gained an immense amount of knowledge from this project. Special thanks to Chris Gold for providing valuable assistance throughout the development process.

Feel free to explore and experiment with this project! Happy bridging! 🎉

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