google/longfellow-zk

Health v2 · maintenance only

Adoption not part of the score

1303 stars · 123 forks observed · 2026-09-03

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A C++ library from Google implementing zero-knowledge proof protocols for identity verification, supporting standards like ISO MDOC, JWT, and W3C Verifiable Credentials. It enables anonymous credential construction from ECDSA signatures and is the reference implementation for an IETF draft specification.

Use cases

• prove identity attributes without revealing personal data
• verify digital identity documents with zero-knowledge proofs
• build anonymous credentials from ECDSA signatures
• implement privacy-preserving age or citizenship verification
• integrate ZK proofs into MDOC or verifiable credential workflows
• evaluate zero-knowledge proof benchmarks in C++

When to choose

• you need standards-based ZK proofs for identity documents like MDOC or verifiable credentials
• you want a Google-backed, actively developed C++ ZK library with an IETF draft specification
• you need anonymous credentials derived from ECDSA signatures

When to avoid

• you need a general-purpose ZK-SNARK framework for arbitrary circuits
• your stack is not C++ or lacks bindings
• you require a library with completed, not in-progress, security reviews

Facets

library · maturity active

cryptography security auth sdk security privacy developer-tools cpp cross-platform zero-knowledge-proofs identity-verification mdoc verifiable-credentials jwt anonymous-credentials ecdsa privacy-preserving-authentication identity cryptography linux macos

Member repositories

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