Longfellow ZK

License: Apache 2.0 eprint IETF Draft

Overview

The Longfellow library enables the construction of zero-knowledge protocols concerning legacy identity verification standards such as the ISO MDOC standard, the JWT standard, and W3 Verifiable Credentials. This implementation is described in:

It is named after the bridge outside the Google Cambridge office.

Ongoing Security Reviews

This project is currently undergoing two independent security reviews by panels of academic and industry experts in the field. See reviews for the latest.

Last modified September 10, 2025: Updated docs, added security review pdf (88cc2ba)