Comprehensive Cross-Chain Interaction Tutorial Using Scroll Messenger

[LamsyA]

Create a comprehensive tutorial demonstrating cross-chain interaction between Layer 1 (L1) and Layer 2 (L2) Ethereum networks using Scroll Messenger. This tutorial should include detailed explanations, code examples, and step-by-step instructions for setting up, deploying, and executing cross-chain transactions.

[DTopGoat]

Video tutorial or a medium thread?

[Traicye]

Can the tutorial be added as a comment under this issue?

[Traicye]

This illustrates sending a message from an L1 smart contract to an L2 smart contract using Scroll Messenger.

Prerequisites:

• Node.js and npm installed

• Basic understanding of Solidity and Ethereum development

• Scroll L1 and L2 development environment set up (e.g., Hardhat, Alchemy)

Steps:

Create L1 Contract (L1Messenger.sol):

pragma solidity ^0.8.0;

contract L1Messenger {
    address public l2Messenger; // Address of L2 Messenger contract

    function setL2Messenger(address _l2Messenger) public {
        l2Messenger = _l2Messenger;
    }

    function sendMessage(string memory message) public {
        L2ScrollMessenger(l2Messenger).receiveMessage(message);
    }
}

Create L2 Contract (L2Messenger.sol):

pragma solidity ^0.8.0;

contract L2Messenger {
    string public message;

    function receiveMessage(string memory _message) public {
        message = _message;
    }
}

Deploy Contracts:

• Deploy L2Messenger on the L2 Scroll network. Get the deployed address of L2Messenger.

• Deploy L1Messenger on the L1 Ethereum network. Set the l2Messenger address in L1Messenger to the deployed L2 address.

• Send Message from L1: Call the sendMessage function in L1Messenger with your desired message.

• Verify Message: Check the message variable in the deployed L2Messenger contract on the L2 network. The message you sent from L1 should be displayed.

[LamsyA]

I already solved this issue by providing the comprehensive guide and more scripts on how to interact with the cross-chain interaction using the scroll messenger.

Admin, kindly check this PR https://github.com/scroll-tech/scroll-guides/pull/8.