Try

The goal of the project is to implement TRY, a lottery offering users collectibles as winning prizes. The rules of the lottery are inspired by Powerball, a popular type of lottery played in the United States. The lottery logic is implemented with a Solidity smart contract on the Ethereum blockchain. Before operating the lottery, the lottery manager buys a batch of collectibles and mints a Non Fungible Token (NFT) for each of them. Each lottery’s winner may receive as a prize one of these collectibles. See the rules in rules.pdf. Details regarding the implementation are in the report.pdf.

Folders

• contracts: contains the smart contracts

• • Lottery.sol: The main contract with the lottery logic
• • LotteryFactory.sol: utility contract to create new lotteries
• • NFT.sol: utility contract to mint NFTs
• • Migrations.sol: Truffle's

• migrations: Truffle's migration scripts folder

• src: contains the DApp html, js, and css files

• test: contains the Javascript test scripts

Test the smart contracts

• Run ganache with ganache -p 8545
• Compile the contracts with truffle compile
• Test with truffle test or truffle test test/file.js

Execute the DApp

• Install the dependencies web3, truffle-contract, lite-server (see package.json) with npm install
• Run ganache with ganache -p 8545
• Compile the contracts with truffle compile
• Migrate the contracts with truffle migrate
• • Be aware the contracts are migrated on ganache at port 8545 (check truffle-config.js)
• • run the lite server with npm run dev
• • Go to the browser, open Metamask, connect Metamask to ganache and to the DApp (there should be a button "connect to DApp"), and import an account by copying and pasting a ganache private key under "import account"
• • Play with the DApp