Ethereum: Chainlink VRF on Arbitrum Sepolia fork: requestRandomWords Failing

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Building a successful lottery with Chainlink VRF on arbitrum

Congratulations, everyone! You completed Patrick Collins’ Foundry course (@big Shoutout) and successfully distributed your first intelligent Ethereum contract. In this article, we will take a closer look at how to create a lottery using Chainlink VRF (random value -added function) on Arbitrum Settolia.

What is a lottery?

A lottery is a type of lottery system in which participants insert a random process to win a prize. It is a great way to generate interest and excitement for your project, while providing an incentive for users to interact with your ecosystem.

Distribution of the lottery on Ethereum Sepolia

To distribute the lottery on Ethereum Sepolia, you will have to follow these steps:

• Sets the Settolia network: Make sure the Sepolia network is set and configured correctly.

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

• VRF library of chain import : it matters the chain VRF bookcase in the Sectolia contract using the `import 'education'.

• Sets the VRF a chain provider

  

  : set up the VRF chain provider on the Sectolia network by creating a new objectVrfostere ‘and connecting it to the Setia contract.

Here is an example code to start:

Solidity `

Pragma solidity ^0.8.0;

import » olidity»;

Raffle Contract {

// matters the VRF chain bookcase

import » olidity»;

// Sets the VRF chain provider on Sepolia

VRFOrposider Public VRF;

// Initializes the VRF chain provider

CONSTRUTOR () {

// Sets the VRF chain provider with the address of the Setia contract and the private key

VRF = New Vrfosteer (address (this), «0x … Your_private_key …»);

}

}

`

Request random words

To generate random words for the lottery, you can use theRequestrandomwords» function from the VRF to chain bookshop. Here is an example code:

Solidity `

Requestrandomwords contract {

// matters the VRF chain bookcase

import » olidity»;

// Initialize a map to store random words

Mapping (Uint256 => string) Public casualwords;

// Function to request random words

Requestrandomwords function () Public {

// Request 1000 random words

Uint256 Count = VRF.requestrandomwords (1000);

// Map The answer to a list of random words

For (Uint256 I = 0; i <Count; I ++) {

Randomwords [Uint256 (i)] = VRF Getrandomword ();

}

}

}

`

Bankruptcy and Debug

If there are problems during distribution, be sure to check the following:

* Private key : Wetting that the private key is correct.

* Network Settolia : Make sure the Setia Network is set correctly and configured correctly.

* VRF Provider: Make sure the VRF provider is initialized correctly.

If you still have problems, feel free to provide more details or ask for further assistance. Good luck with your project!

REQUEST CLASSIMAL WORDS FAILS

While we have just completed our distribution of the lottery on Ethereum Sepolia, let's take a look at how to request random words using Chainlink VRF.

Solidity

Requestrandomwords contract {

// matters the VRF chain bookcase

import » olidity»;

// Initialize a map to store random words

Mapping (Uint256 => string) Public casualwords;

// Function to request random words

Requestrandomwords function () Public {

// Request 1000 random words

Uint256 Count = VRF.