Solidity Lottery Project

This project is a decentralized lottery system built with Solidity, leveraging the Foundry development framework. The lottery allows users to participate by sending a specified amount of cryptocurrency, with a verifiably random winner selected to receive the prize pool. This project is deployed and tested on the Sepolia test network.

Features

• Lottery Entry Mechanism: Participants can enter the lottery by sending the required entry fee to the contract.
• Random Winner Selection: We use Chainlink’s VRF (Verifiable Random Function) for transparent, verifiable randomness in selecting a winner, ensuring fairness and security.
• Automatic Payouts: After a winner is selected, the prize pool is automatically transferred to the winner’s wallet.
• Secure and Auditable: The contract includes security measures to prevent reentrancy and unauthorized access, and ensures transparency through on-chain randomness.

Project Structure

• Smart Contract: Written in Solidity, defining entry, prize distribution, and randomness functions.
• Testing: Unit tests are implemented using Foundry to ensure reliability of all key functions.
• Deployment: Deployed and tested on the Sepolia test network for smooth operation in real-world scenarios.

Requirements

• Foundry: Used for development and testing of the smart contract.
• Chainlink VRF: Ensures randomness for fair selection.
• Sepolia Test Network: Deployed for testing purposes.

Installation and Setup

1. Clone the Repository:

   git clone <repository-url>
   cd Foundary-Lottery
   
   

Foundry consists of:

• Forge: Ethereum testing framework (like Truffle, Hardhat and DappTools).
• Cast: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
• Anvil: Local Ethereum node, akin to Ganache, Hardhat Network.
• Chisel: Fast, utilitarian, and verbose solidity REPL.

Documentation

// Layout of the contract file: // version // imports // errors // interfaces, libraries, contract

// Inside Contract: // Type declarations // State variables // Events // Modifiers // Functions

// Layout of Functions: // constructor // receive function (if exists) // fallback function (if exists) // external // public // internal // private

// view & pure functions

https://book.getfoundry.sh/

Usage

Build

$ forge build

Test

$ forge test

Format

$ forge fmt

Gas Snapshots

$ forge snapshot

Anvil

$ anvil

Deploy

$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>

Cast

$ cast <subcommand>

Help

$ forge --help
$ anvil --help
$ cast --help

Contributions

THis project is open for Frontend and backend Contributions: Lets make WEB3 more user interactive ....!!!