howellsy / smart-contract-lottery

A provably fair and verifiably random lottery using Chainlink VRF and Chainlink Automation.

Smart Contract Lottery

A provably fair and verifiably random lottery written in Solidity leveraging:

• Chainlink VRF for randomness
• Chainlink Automation for time based trigger

You can see this smart contract deployed on Sepolia here.

⚒️ Built with Foundry

This project is built with Foundry a portable and modular toolkit for Ethereum application development, which is required to build and deploy the project.

🏗️ Getting started

Create a .env file with the following entries:

SEPOLIA_RPC_URL=<sepolia_rpc_url>
PRIVATE_KEY=<private_key>
ETHERSCAN_API_KEY=<etherscan_api_key>

Install project dependencies

make install

Deploy the smart contract on Anvil

make anvil
make deploy

Deploy the smart contract on Sepolia

make deploy ARGS="--network sepolia"

🧪 Running tests

To run against a local Anvil Ethereum node:

forge test

To run against a forked environment (e.g. a forked Sepolia testnet):

forge test --fork-url <sepolia_rpc_url>