Ethereum: Chainlink VRF on Arbitrum Sepolia fork: requestRandomWords Failing

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Successful Lottery with Chainlink VRF on Arbitrum

Congratulations everyone! You have completed Patrick Collins (@Big Shoutout)’s casting course and successfully implemented your first Ethereum smart contract. In this article, we will take a closer look at how to create a lottery using Chainlink VRF (Value-Added Random Function) on Arbitrum Sepolia.

What is a lottery?

A lottery is a type of lottery system where participants are randomly entered to win a prize. It is a great way to generate interest and excitement about a project, as well as encourage users to engage with your ecosystem.

Publishing a Lottery on Ethereum Sepolia

To publish a lottery on Ethereum Sepolia, you will need to complete the following steps:

• Set up the Sepolia network

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

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

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

• Set up the Chainlink VRF provider: Set up the Chainlink VRF provider in the Sepolia network by creating a new VRFPovider object and associating it with the Sepolia contract.

Here’s some sample code to get you started:

pragma solidity ^0.8.0;
import "
contract lottery {
// Import the Chainlink VRF library
import "
// Set up the Chainlink VRF provider for Sepolia.
VRFProvider public vrf;
// Initialize the Chainlink VRF provider
constructor () {
// Set up the Chainlink VRF provider using the Sepolia contract address and private key
vrf = new VRFProvider(address(this), "0x...YOUR_PRIVATE_KEY...");
}
}

Request Random Words

To generate random words for your lottery, you can use the `requestRandomWordsfunction from the Chainlink VRF library. Here is 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 the list of random words
for (uint256 i = 0; i < count; i++) {
randomWords[uint256(i)] = vrf getRandomWord();
}
}
}

“ solidity

contract RequestRandomWords {

// Import the Chainlink VRF library

import “

// Initialize a map to store the random words

mapping (uint256 => string) public randomWords;

// Function to request random words

function requestRandomWords() public {

// Request 1000 random words

uint256 number = vrf.