ZK Offchain Sentinel

Overview

Using our protocol, you can collateralize your off-chain assets to mint GHO tokens on-chain using our secure Offchain-Sentinel Facilitator. We are using TLSN to generate ZK proofs stating your locked off-chain assets. For this hackathon, we have used Stripe in which users can pay in USD to a third party that can maintain an on-chain balance, which will be locked to mint the GHO tokens on-chain. Let's understand it from the perspective of users and the third party:-

1. User
   • You pay in USD to a third party using Stripe
   • You get the respective amount of GHO tokens you have collateralized off-chain assets for.
2. ThirdParty
   • Maintains assets on-chain
   • Receives USD payment off-chain from the user
   • Locks the on-chain assets to mint GHO tokens for the user.

How it works

TLSN is used to generate proofs for payments made from users to third parties and vice-versa. These TLSN proving mechanisms are written in Rust as they need to be time and memory-efficient. We have designed two nodes for this project:-

1. Validator Node(Third Party):- Receives the webhook from Stripe generates a TLSN proof for the payment and shares it with the Sentinel Node.

2. Sentinel Node:- Receives and verifies the proof from the Validator node and calls the smart contract to mint GHO tokens. Similarly, receives payment proofs(TLSN) from the user and burns GHO tokens.

Contract Addresses(Sepolia)

• Sentinel Facilitator: 0xDd81096cd08f4503C92036892968f55eff422cEC
• Demo GHO: 0x6389d8ac913FDFcE1dF2082305Bb7a9F5A9202C8
• Sentinal Node Address(EOA): 0x53d973560A9cF4576f4427bD5081e4BfcfBe9938