This product is developped for ETH Tokyo 2024 Hackthon ( https://www.ethtokyo.com/ ).

The huckathon details are found at https://app.akindo.io/hackathons/3dXM7ZO2WsxvlkXp .

What it does

• We build a multi-play treasure hunt game, which is based on ZKP technology, as the project name says. Prover sets a hidden treasure spot secretly, and users moves around on the map to find the spot. Each user provides information about the move (source and destination positions), then Prover generates a ZK proof which shows if the move is towards the hidden spot (or apart from the spot), and publishes the proof onto a blockchain. (with this step, users are able to identify whether the move is towards a right direction to the treasure spot, while the spot location is not exposed) A user decides on his/her next move, based on the published the proofs. Upon a preset time comes, a nearly user will be awarded.

The problem it solves

• Our problem is that how we can share a user's location is closer to the treasure spot location without exposing the spot location itself.

Challenges I ran into

• We took a long time to reach to this idea, while we set our domain as a kind of location plus ZKP.

Technologies I used

• We used ZKP platform. We wrote circuits in 'circom' and comiled them for 'groth16' with 'snarkJS'.

How we built it

• We divided our activities into two pieces, such as frontend and backend; the frontend team works mainly on map UI, the backend team works on ZK circuit and related libraries and contracts.