Scaffold Garaga app

This is a Noir+Garaga+Starknet starter with in-browser proving and a step-by-step guide how to:

• Generate and deploy UltraHonk proof verifier contract to Starknet devnet
• Add state to your privacy preserving app
• Add wallet connection and deploy to public testnet

Install

Ensure you have node.js >= 20 installed.

Bun is used for package management, install it with:

make install-bun

For compiling Noir circuits and generating proofs we need specific versions of Aztec packages:

make install-noir
make install-barretenberg

Starknet toolkit comes in a single bundle via asdf (the following command will install it if you don't have it):

make install-starknet

We also need to install a tool for spawning local Starknet chain:

make install-devnet

Finally we need to install Garaga. Make sure you have Python 3.10 in your system. You may also need to start a separate Python virtual environment for this to work. You can do that with python3.10 -m venv garaga-venv && source garaga-venv/bin/activate. Then install with:

make install-garaga

Note that we need specific versions of Noir, Barretenberg, and Garaga to work well together. If you are experiencing any issues with code generation, proving, and verification — first of all ensure you have the correct package versions.

Tutorial

This repo is organized in layers: each app iteration is a new git branch.

Follow the steps and checkout the necessary branch:

1. master — in-browser proof generation and stateless proof verification in devnet
2. 1-app-logic — more involved Noir circuit logic
3. 2-app-state — extend onchain part with a storage for nullifiers
4. 3-testnet — deploy to public Starknet testnet and interact via wallet

Run app

First of all we need to build our Noir circuit:

make build-circuit

Sample inputs are already provided in Prover.toml, execute to generate witness:

make exec-circuit

Generate verification key:

make gen-vk

Now we can generate the verifier contract in Cairo using Garaga:

make gen-verifier

Let's start our local development network in other terminal instance:

make devnet

You now need to start a new terminal window. Initialize the account we will be using for deployment:

make accounts-file

First we need to declare out contract ("upload" contract code):

make declare-verifier

Now we can instantiate the contract class we obtained (you might need to update the command in Makefile):

make deploy-verifier

Great! Now let's copy necessary artifacts:

make artifacts

Prepare the app and its requirements so you can run it. Go to the app folder and:

1. Update the contract address in the app code (change App.tsx).
2. Make sure you have tsc installed. If not, you can install it with bun add -d typescript@next.
3. Install vite with npm install -D vite
4. Build the app with bun run build
5. Finally we can run the app: bun run dev

Useful links

• Noir quickstart https://noir-lang.org/docs/getting_started/quick_start
• Garaga docs https://garaga.gitbook.io/garaga/deploy-your-snark-verifier-on-starknet/noir
• Starknet.js docs https://starknetjs.com/docs/guides/intro
• Starknet quickstart https://docs.starknet.io/quick-start/overview/
• Sncast 101 https://foundry-rs.github.io/starknet-foundry/starknet/101.html
• Cairo book https://book.cairo-lang.org/