Awesome

Scaffold-ETH Noir

This is a sandbox educational project for testing age-restricted contracts using Noir, a Domain Specific Language for writing ZKP-circuits. This project was built using Scaffold-ETH 2, refer to SE2 README for set-up.

In the UI a story is told of how Alice gets a free balloon. But you can also see the overview below.

Running the project

1. Run yarn && yarn chain in terminal 1 to start the hardhat chain locally
2. Run yarn deploy --reset in terminal 2 to deploy the contracts
3. Run yarn start in terminal 3 to run the UI

Prerequisites

• requires nargo (tested with v0.17.0)
• requires [node] (https://nodejs.org/en) (tested with v18.8.0)
• requires [yarn] (https://yarnpkg.com/getting-started/install) (tested with 3.2.3)

Inspiration

• Age proof circuit from "noir by example"
• Noir-wasm set-up from "noir-starter"

food for thought

• If the balloon store instead wanted to check the complete birth date, what would we need to change in this implementation?
• What happens if Bob who is now 8 y/o tries to call the current contract in two years. Would he succeed?
• If we instead wanted to make an age restricted contract, but checking "older than", what would we need to change?
• How would you change the contract so that it's possible for the balloon store to have multiple trusted third parties?
• Try to create the proof manually using nargo prove and use that proof to call the contract. Does it work?
• What happens if Alice, instead of getting her balloon token, shares her privateKey with Charlie who is 14 y/o, is there something stopping him from getting a free balloon? What could we change or add to this implementation to prevent that from happening?