Cross-Chain Messaging App

(Ethereum Sepolia ↔ Polygon Amoy using Hyperlane)

Overview

This project is a blockchain-based messaging app that lets users send messages between two different blockchains: Ethereum's Sepolia testnet and Polygon's Amoy testnet. It uses Hyperlane, a cross-chain communication protocol, to make this possible.

What It Does

• ✅ Send Messages Across Blockchains
  You can send a message from one test network (like Sepolia) to another (like Amoy), even though they are separate blockchains.

• 🔁 Live Message Tracking
  Once a message is sent, the app checks its delivery status regularly and updates you in real-time (e.g., pending, delivered, failed).

• 🕒 View Message History
  The app shows a complete list of all sent and received messages, along with timestamps and whether the message was delivered or not.

Why This Project is Useful

• It demonstrates how different blockchains can “talk” to each other—something that’s becoming more and more important in Web3.
• Helps developers and testers try out cross-chain features in a safe, low-cost testnet environment.
• Can be a base for building more complex cross-chain apps, like sending data or tokens between networks.

Built With

• Hyperlane – to handle the actual message sending across chains
• Ethereum Sepolia + Polygon Amoy – as the two test blockchains
• Smart Contracts + Frontend UI – to send, receive, track, and show messages
• Polling Logic – to keep checking if the message arrived on the other chain

What’s Next

• Add support for more testnets and eventually mainnets
• Improve message delivery speed and user experience
• Possibly expand to token transfers or other cross-chain use cases

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