Blockchain raffle (Solidity EVM contracts)

Warning: These contracts have not been audited. I am not responsible for any loss of funds or damages incurred.

How does it work?

Allows the running of lottery games with startGame(), where players acquire tickets with gameToken (ERC20), at gameTicketPrice, with a total of gameMaxPlayers, playing up to gameMaxTicketsPlayer each. Players can buyTicket() at _numberOfTickets.

Player's gameToken are transfered to the contract, the winner receives the total _pot of all player gameToken on contract, and any additional game pots defined with addGamePotERC20Asset(), addGamePotERC721Asset() or addGamePotERC1155Asset(), in endGame(). Minus gameFeePercent (hundredth) fee to gameFeeAddress.

Caveat

Ideally needs a keeper bot to make frequent irregular calls of Oracle.feedRandomness(uint256), to make it difficult to determine game outcomes.

Requirements

Tools

npm install -g solc truffle

Configuration

Truffle optimizer MUST be true, in order to compile these contracts. Use a low run value, to compile faster in testing scenarios.

Local development

npm install

Testing

truffle test

A Next.js front-end

https://github.com/AlexanderGW/raffle-nextjs