Enigma - Non Fungable Token Lottery

About

Enigma is a secure computation protocol, where “secret nodes” in our network perform computations over encrypted data. Enigma brings privacy to any kind of computation - not just transactions - helping to improve the adoption and usability of decentralized technologies.

This application uses enigma's secret contracts and ethereum's smart contracts to create a private NFT lottery.

Key Features:

• client enables the contract owner can encrypt and send a list of 100 whitelisted Ethereum addresses
• client enables users encrypt and submit their addresses to the secret contract
• winner receives his token automatically

Using the scripts

This project comes with a few handy scripts to help you create ERC721 contracts and mint tokens.

• Create an ERC721 contract: npx truffle exec ./scripts/createERC721.js <name> <symbol>

  will printout the address of the contract

• Mint a token npx truffle exec ./scripts/mintToken.js <address> <tokenId>

Stack

• next-js
• react
• mobx-state-tree
• web3

Setup

Secret Contracts

1. npm install
2. rename .env-default to .env
3. modify .env "BUILD_CONTRACTS_PATH"
4. discovery compile
5. discovery start
6. once started: discovery migrate

Client

1. cd client
2. npm install
3. rename .env-default to .env
4. modify .env according to your setup
5. npm run dev

Pitfalls

• After doing discovery start make sure you reset metamask
• Cannot run discovery because docker.sock doesn't exist in windows OS.
• When using WSL, docker-compose mount paths don't work.
• Sometimes running tests fail: "incorrect epoch", fixed by delaying each test for 1 second.
• Secret contract's Cargo.toml must have name "contract".