AttempWinnerCaller

The goal of this project is to Emit the winner event on this Alchemy smart contract on the Goerli testnet:

https://goerli.etherscan.io/address/0xcF469d3BEB3Fc24cEe979eFf83BE33ed50988502#code

If you take a look at the code tab, you'll see that the source code for this contract looks like this:

// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

contract Contract {
    event Winner(address);

    function attempt() external {
        require(msg.sender != tx.origin, "msg.sender is equal to tx.origin");
        emit Winner(msg.sender);
    }
}

Key Learnings

• Contract deployment via Hardhat

• Contract interaction

• Difference between msg.sender and tx.origin.

Step to reproduce

1. Install dependencies:

npm i -D hardhat -- yes to all
npm i dotenv

2. Deploy your contract in Goerli Testnet:

npx hardhat run scripts/deploy.js --network goerli

3. Replace the variable CONTRACT_ADDRESS in the script triggerWinner.js with your deployed contract address and run:

npx hardhat run scripts/triggerWinner.js --network goerli

4. DONE

P.S: You should see an event emitted on the Alchemy smart contract address above:

This is also the solution for the Telephone challenge on Ethernaut