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Version: V3

Quick setup

Semaphore provides an official CLI to set up your project with Hardhat. If your NPM version is 5.2 or higher you can use NPX:

npx @semaphore-protocol/[email protected] create my-app

Otherwise, install @semaphore-protocol/cli globally and run the create command:

npm i -g @semaphore-protocol/[email protected]
semaphore create my-app
info

The semaphore CLI can also be used to get group data from a supported network (e.g semaphore get-groups --network goerli).

To start working on your project, install the dependencies:

cd my-app
npm i

Output​

The create command will create a directory called my-app (or whatever name you choose) inside the current folder. That directory will contain the initial project structure, which includes a simple contract, a task to deploy that contract and some tests.

my-app
├── contracts
│   └── Greeter.sol
├── .env.example
├── .gitignore
├── hardhat.config.ts
├── package.json
├── README.md
├── tasks
│   └── deploy.ts
├── test
│   └── Greeter.ts
└── tsconfig.json

The Greeter.sol contract creates a Semaphore group, allows users to join that group with their Semaphore identity, and finally allows group members to send an anonymous greeting.

Usage​

Compile​

Compile your contracts by running:

npm run compile

Test​

Test your contracts by running:

npm test

You can also generate a test coverage report:

npm run test:coverage

Or a test gas report:

npm run test:report-gas

Deploy​

Follow the instructions below to deploy your contracts:

  1. Copy the .env.example file as .env.

    cp .env.example .env

  2. Add your environment variables.

    note

    You should at least set a valid Ethereum URL (e.g. Infura) and a private key with some ethers.

  3. And deploy your contract.

    npm run deploy --semaphore <semaphore-address> --group <group-id> --network goerli
    note

    Check the Semaphore contract addresses here.

    caution

    The group id is a number.