Aztec Passport

Aztec Passport is an identity verification platform that enables users to verify their social accounts, decentralized identifiers (DIDs), Biometrics and on-chain activities while preserving privacy.

How Aztec Passport leverages Aztec’s features:

• Social Accounts Verification: Uses zk-email proofs to validate ownership without exposing sensitive information.
• DID Verification: Utilizes zk-proofs to verify JWTs for secure validation of decentralized identifiers.
• Bio-metric Verification: Use of face descriptors to verify government issued IDs such as Driver's License, Passport, etc.
• On-Chain Activity Verification: Uses Aztec’s L1-to-L2 message portal to verify on-chain activities such as ETH Balance and ENS Names.

Challenge Selection

• ZKEmail Guardian
• Social Cipher

Note: You can change which challenges you've selected during the competition if you'd like. You are not bound by your choices or descriptions entered during the one week check-in.

Team information

• Vedant Chainani: github/Envoy-VC - Full Stack Developer.

Technical Approach

Smart Contracts

• Coordinator Contract: Central contract that manages interactions between different modules, coordinating the identity verification process and facilitating seamless integration of new modules.

• Module Whitelist Contract: Maintains a list of approved modules that the Coordinator Contract can interact with. This ensures only verified modules are used for identity verification.

  • Social Verification Module: Verifies social accounts using zk-email proofs, enabling private proof of ownership for platforms like Twitter, GitHub, or LinkedIn.

  • zkJWT Contracts: Verifies DIDs by processing JWTs using zk-proofs.

  • Biometric Verification Module: Verifies government-issued IDs using face descriptors, ensuring secure and private identity verification.

  • Message Portal Contracts: Utilize Aztec’s L1-to-L2 message portal to verify on-chain activities such as balances, transactions, and other blockchain interactions, ensuring cross-layer communication.

Front-End

• Web Application: A user interface that enables users to interact with the Coordinator Contract, granting access to all modules.

Specific Aztec Tools Used

• zk-email
• Portals

Expected Outcomes

• Modular, Scalable Identity Framework: Create a modular identity framework that supports various identification mechanisms and strategies.
• zkJWT Implementation on Noir: Successfully implement JWT Validation in Noir using primitives like RSA, SHA_256, Base64 and Finite point Arithmetic.
• On-Chain Verification: Implement on-chain verification of user activities using Aztec’s L1-to-L2 message portal.

Lessons Learned (For Submission)

• As on current state the Sandbox doesn't generate any proofs and we were verifying the whole Email Body during Twitter Verification, which could take a lot of time, so in future we would like to use body masking to decrease the body size to only the required sections.
• As Noir does not have a interfaces, we moved to a module pattern where there is a Entrypoint contract called Passport and all the modules have Ownable functions and passport_address in one of their storage slots, which can be used to invoke functions in the Entrypoint contract, which helped to achieve a modular architecture.
• There is a small snippet to compare BoundedVec to [u8] which helped in comparing extracted Twitter Usernames: here

Project Links (For Submission)

Entire Code for the project can be found here

https://github.com/Envoy-VC/ab2/tree/aztec-passport/Aztec-Passport

as well as some of the Libraries created during building this Project as developer tooling:

• noir_hmac: HMAC implementation in Noir Language over SHA-256 Hash Algorithm.
• noir_base64_lib: Extension of noir_base64 with support for Vectors and Base64 URL encoding and decoding
• noir_jwt: Verify JWTs and attest claims in Noir Language
• noir_social_verify: Wrapper around zkemailnr to verify social accounts and extract details like X username, and emails.

All of them can be found here

https://github.com/Envoy-VC/noir_hmac https://github.com/Envoy-VC/noir_base64_lib https://github.com/Envoy-VC/noir_jwt https://github.com/Envoy-VC/noir_social_verify

Video Demo (For Submission)

https://youtu.be/3IpaD-8wxCM