Ethereum: Chainlink VRF on Arbitrum Sepolia fork: requestRandomWords Failing

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Building a Successful Raffle with Chainlink VRF on Arbitrum

Congratulations, everyone! You’ve completed the Foundry Course by Patrick Collins (@Big Shoutout) and have successfully deployed your first Ethereum smart contract. In this article, we’ll take a closer look at how to create a raffle using Chainlink VRF (Value-Added Random Function) on Arbitrum Sepolia.

What is a Raffle?

A raffle is a type of lottery system where participants enter a random process to win a prize. It’s a great way to generate interest and excitement around your project, while also providing an incentive for users to engage with your ecosystem.

Deploying the Raffle on Ethereum Sepolia

To deploy the raffle on Ethereum Sepolia, you’ll need to follow these steps:

• Set up the Sepolia Network

  : Make sure that your Sepolia network is set up and configured properly.

• Create a new Sepolia contract: Create a new Sepolia contract using the Sepolia Solidity compiler.

• Import Chainlink VRF library: Import the Chainlink VRF library into your Sepolia contract using the import statement.

• Set up the Chainlink VRF provider: Set up the Chainlink VRF provider on your Sepolia network by creating a new VRFProvider object and linking it to your Sepolia contract.

Here’s some sample code to get you started:

pragma solidity ^0.8.0;


import "


contract Raffle {

    // Import the Chainlink VRF library

    import "

    

    // Set up the Chainlink VRF provider on Sepolia

    VRFProvider public vrf;

    

    // Initialize the Chainlink VRF provider

    constructor() {

        // Set up the Chainlink VRF provider with your Sepolia contract address and private key

        vrf = new VRFProvider(address(this), "0x...YOUR_PRIVATE_KEY...");

    }

}

Request Random Words

To generate random words for your raffle, you can use the requestRandomWords function from the Chainlink VRF library. Here’s some sample code:

contract RequestRandomWords {

    // Import the Chainlink VRF library

    import "

    

    // Initialize a map to store random words

    mapping (uint256 => string) public randomWords;

    

    // Function to request random words

    function requestRandomWords() public {

        // Request 1000 random words

        uint256 count = vrf.requestRandomWords(1000);

        

        // Map the response to a list of random words

        for (uint256 i = 0; i < count; i++) {

            randomWords[uint256(i)] = vrf getRandomWord();

        }

    }

}

Failing and Debugging

If you encounter any issues during deployment, make sure to check the following:

• Private key: Double-check that your private key is correct.

• Sepolia network: Ensure that your Sepolia network is set up properly and configured correctly.

• VRF provider: Make sure that the VRF provider is initialized correctly.

If you’re still having issues, feel free to provide more details or ask for further assistance. Good luck with your project!

Request Random Words Failing

As we’ve just completed our raffle deployment on Ethereum Sepolia, let’s take a look at how to request random words using Chainlink VRF.

“`solidity

contract RequestRandomWords {

// Import the Chainlink VRF library

import “

// Initialize a map to store random words

mapping (uint256 => string) public randomWords;

// Function to request random words

function requestRandomWords() public {

// Request 1000 random words

uint256 count = vrf.

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