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hardhat-smart-contract-lottery

"Hardhat Smart Contract Lottery" is a blockchain project that leverages Ethereum smart contracts to implement a lottery system. Developed using Hardhat, this project provides a comprehensive setup for Solidity development, testing, and deployment.

#bun#chainlink#chainlink-keepers#chainlink-vrf#ethereum#ethers

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README preview

Hardhat Smart Contract Lottery

This Ethereum project provides a decentralized, transparent lottery system built using Solidity and the Hardhat development environment. It leverages Chainlink VRF for secure randomness in winner selection.

Prerequisites

Node.js (https://nodejs.org/)
Bun (https://bun.sh/)
Knowledge of Solidity and smart contract development fundamentals.
Experience with Hardhat for development and testing.
Understanding of Chainlink VRF for a verifiable source of randomness.

Setup

Clone the Repository:

git clone https://github.com/nawodyaishan/hardhat-smart-contract-lottery.git
cd hardhat-smart-contract-lottery

Install Dependencies:
```
bun install
```
Environment Variables:
- Create a .env file in the project root (not tracked by version control).
- Use this file to store:
  - API Keys: Etherscan, Infura, CoinMarketCap.
  - Network RPC URLs (Sepolia, Mainnet, etc.).
  - Private keys or mnemonic phrases for testing and deployment.

Core Smart Contracts

Raffle.sol
- Entry management (purchase tickets).
- Chainlink VRF integration to obtain provably random numbers.
- Automated winner selection logic.
- Distribution of the prize pool to the winner.
VRFCoordinatorV2Mock.sol
- Implements essential VRF functionality for local development and testing.

Essential Hardhat Tasks

bun run compile: Compiles smart contracts.
bun run test: Executes the test suite.
bun run deploy:contracts: Deploys to the specified network.
bun run verify: Verifies contracts on Etherscan (use --network networkName).