♠ Lottery ♣

Lottery contract with VRF2 Contract is using VRFv2 for generating random numbers. Therefore, for the correct operation of the contract, it is necessary to create subscription on > https://vrf.chain.link/goerli for rinkeby testnet or https://vrf.chain.link/mainnet for mainnet, replenish the balance of LINK and add contract address as a consumer

📁 Table of Contents

• General Info
• Technologies Used
• Features
• Requirements For Initial Setup
• Setup
• Contact

🚩 General Information

• Owner(admin) of the contract can start/end lottery
• Every user can participate and price of ticket is based on LOT ERC20 tokens. Each ticket represents itself an ERC721 token
• After owner end lottery, the winner will be picked using randomness from Chainlink VRFv2 Coordinator

💻 Technologies Used

• Chainlink VRFv2
• hh coverage
• slither
• docgen

🌟 Features

• Trully random contract(Ideally for lottery)
• Ticket price is based LOT tokens
• The contract has been properly reviewed.

👀 Requirements For Initial Setup

• Install NodeJS, should work with any node version below 16.16.0
• Install Hardhat

📟 Setup

1. 💾 Clone/Download the Repository

2. 📦 Install Dependencies:

$ cd lottery_file
$ npm install

3. 🔍 .env environment variables required to set up

Create .env file inside project folder

• You can get your ethereum or testnet API key here,here or any other service that allow you to connect to the nodes
• You can get your private key from your wallet (Don't share your private key with untrusted parties)
• Subscription id can be obtained here after creation of subscription here
• Key Hash and address of vrf coordinator can be obtained from here here Just choose network and copy:)
• You can get your etherscan API -key here.
• LOT_ADDRESS be available after deploying contracts

GOERLI_API = <Goerli API key>
MAINNET_API = <Ethereum mainnet API key>
PRIVATE_KEY = <Private key of your wallet u want to deploy contracts from>
ETHERSCAN_KEY = <Etherscan API key in order to verify your contracts>
SUBSCRIPTION_ID = <VRFv2 subcription id>
KEY_HASH = <Key Hash>
AGGREGATOR = <Aggregator address(depends on network)>
VRF_COORDINATOR = <VRF coordinator address(depends on network)>
PERCENT_WINNER = <Percent of total collected funds of lottery winner will receive(PERCENT_WINNER+PERCENT_OWNER must be 100)>
PERCENT_OWNER = <Percent of total collected funds of lottery winner will receive(PERCENT_WINNER+PERCENT_OWNER must be 100)>
TICKET_PRICE = <Price in LOT tokens in order to participate in Lottery>

4. ⚠️ Run Tests

$ npm run test

$ npm run coverage

5. 🚀 Deploy to GORELI or Mainnet

$ npm run deploy:goerli

$ npm run deploy:polygon

$ npm run deploy:mainnet

Note:

deploy.ts implements the verification script and you don't need to complete any additional steps in order to verify the contract.

💬 Contact

Created by @LESKOV - feel free to contact me!