Smart Contract Lottery - Prooveably Random Raffle Contract

About

This project is a simple smart contract lottery that uses a prooveably uses randomness to draw a winner. It is based on the Chainlink VRF and Chainlink Automation to automate the draw.

TODO / How it works:

• Users can enter the lottery by buying a ticket
  • 90% of the ticket fees sum up to the prize pool and are distributed to the winner
  • 10% of the ticket fees are distributed to the owner of the raffle
  • the owner is responsible for refunding the chainlink subscription and chainlink automation
  • there is no way for the owner to withdraw the prize pool
• After a certain amount of time, the lottery is closed and a winner is drawn
  • This will be done utilising Chainlink's VRF for Randomness and Chainlink's Automation for executing the draw

Foundry

Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.

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

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