Chainlink CCIP Demo Repository

This repository is for storing code that demonstrates how Chainlinks CCIP works and how you can use it to transfer messages across blockchains.

I have written a blog post that explains the entire project in detail here

And I have created a video that will demonstrate how it works here

Supported Networks by CCIP

https://docs.chain.link/ccip/supported-networks

How to run the demo

Prerequisites

1. Create the .env file with approriate values. You can use the .env_example file as a template.

   # SENDER AND RECEIVER URLS are RPC Endpoints for 
   # sender and receiver chains
   SENDER_URL=
   RECEIVER_URL=
   # Private key is the private key of account which you own
   # and you wish to use to deploy the contracts and interact with them
   # you need to have native tokens and LINK tokens on both chains 
   # at this address
   PRIVATE_KEY=
   
   # Sender Router Contract is Chainlinks Router Contract Address on 
   # Sender chain
   SENDER_ROUTER_CONTRACT=
   # Sender Link Contract is LINK Contract Address on 
   # Sender chain
   SENDER_LINK_CONTRACT=
   # Receiver Router Contract is Chainlinks Router Contract Address on 
   # Receiver chain
   RECEIVER_ROUTER_CONTRACT=
   # Each chain that is supported by Chainlinks CCIP has its own selector
   # you need your destination chain address here
   DESTINATION_CHAIN_SELECTOR=
   
   # You can set these after deployment of Actual contracts
   # you dont need to worry about it in beginning.
   # Address of Sender contract you just deployed
   SENDER_CONTRACT_ADDRESS=
   # Address of Receiver contract you just deployed.
   RECEIVER_CONTRACT_ADDRESS=
   

2. Install the dependencies

   npm install

3. Deploy the sender smart contracts

   npx hardhat run scripts/deploy-sender.ts --network sender

4. Deploy the receiver smart contracts

   npx hardhat run scripts/deploy-receiver.ts --network receiver

5. Send a message from sender to receiver

   npx hardhat run scripts/send-message.ts --network sender

6. Read the message sent from sender to receiver

   npx hardhat run scripts/receive-message.ts --network receiver