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Build a successful lottery with Chainlink VRF on arbitrum
Congratulations, everyone! You have finished the course of the Foundry of Patrick Collins (@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 arouse interest and excitement for your project, offering users an incentive 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:
- Configure the Sepolia
network: Make sure that the Setia Network is configured and configured correctly.
- Create a new Setal contract: Create a new Sepolia contract using the Sépolia solidity compiler.
- Imports the VRF bookshop of Chainlink
: import the VRF chains bookcase into the Sectolia contract using the `
import 'education'.
- Configure the VRF Chainlink supplier: configure the VRF chains supplier on the Settolia network by creating a newVrfProvider ‘object and linking it to the Sepolia contract.
Here is an example of code to start:
`Solidity
Pragma solidity ^ 0.8.0;
Import " olidity";
Design of the fate of the contract {
// Imports the Chainlink VRF library
Import " olidity";
// configures the VRF Chainlink supplier on Settolia
VRFOrposider Public VRF;
// Initialize the VRF Chainlink supplier
Manufacturer () {
// configures the VRF chains supplier with the address of the Sépolia contract and the private key
VRF = New Vrfosteer (address (this), "0x ... Your_private_key ...");
}
}
'
Asking random words
To generate random words for your lottery, you can use the "Requestrandomwords" function of the VRF chain library. Here is an example of code:
Solidity
Requestomwords contract {
// Imports the Chainlink VRF library
Import " olidity";
// Initialize a card to store random words
Uint256 => string) public random;
// works to ask for random words
Requestrandomwords () Public ()
// Request 1000 random words
Uint256 Count = VRF.requestrandomwords (1000);
// Card the answer to a list of random words
For (Uint256 I = 0; i <Count; I ++) {
Randomwords [Uint256 (i)] = VRF Getrandomword ();
}
}
}
'
Bankruptcy and Debug
If you find problems during distribution, be sure to check the following:
* Private key : Check that the private key is correct.
* Network Settolia : Make sure the Setia Network is configured correctly and configured correctly.
* VRF Provider: Make sure the VRF supplier is initialized correctly.
If you always find problems, do not hesitate to provide more details or request further help. Good luck with your project!
Ask random words that fail
Since we have just finished our lottery distribution on Ethereum Setololia, we examine how to ask for random words using Chainlink VRF.
` Solidity
Requestomwords contract {
// Imports the Chainlink VRF library
Import ” olidity”;
// Initialize a card to store random words
Uint256 => string) public random;
// works to ask for random words
Requestrandomwords () Public ()
// Request 1000 random words
Uint256 Count = VRF.