Smart Lottery Contract

A decentralized and verifiably random lottery system built with Solidity and Chainlink VRF.

Overview

SmartLottery is a decentralized lottery system that allows users to:

• Create and participate in multiple concurrent lottery instances
• Enter lotteries by purchasing tickets
• Have winners selected automatically and fairly using Chainlink's Verifiable Random Function (VRF)
• Operate lotteries with customizable parameters like ticket price and expiration time

Key Features

• Multiple Concurrent Lotteries: Support for running multiple lottery instances simultaneously
• Verifiable Randomness: Uses Chainlink VRF for provably fair winner selection
• Customizable Parameters: Configurable ticket prices and expiration times
• Role-Based Access: Lottery operators have special privileges for managing their lotteries
• Automated Winner Selection: Winners are selected and paid out automatically
• Gas Efficient: Optimized for minimal gas consumption

Contract Architecture

The system consists of the following main components:

• SmartLottery.sol: The main contract handling lottery logic
• HelperConfig.sol: Configuration helper for different networks
• DeployLottery.s.sol: Deployment script

Technical Details

Key Dependencies

• Solidity ^0.8.20
• Chainlink VRF V2 Plus
• Foundry for development and testing

Network Configurations

• Supports Sepolia testnet and local development
• Configurable VRF parameters per network

Development

Prerequisites

• Foundry
• Chainlink VRF Subscription (for live networks)

Installation

1. Clone the repository:

   git clone https://github.com/yourusername/smart-lottery
   cd smart-lottery

2. Install dependencies:

   forge install

3. Build the project:

   forge build

4. Run tests:

   forge test