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Summary

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This specification creating group operates under the Linux Foundation Community Specification License v1.0.

Meeting Attendees

Stephen Curran (BC Gov / Cloud Compass Computing Inc.) <swcurran@cloudcompass.ca>

Steve McCown (Anonyome Labs) <smccown@anonyome.com>

Related Repositories:

• AnonCreds Specification: https://hyperledger.github.io/anoncreds-spec/
• AnonCreds Methods Registry: https://hyperledger.github.io/anoncreds-methods-registry
• AnonCreds Rust Open Source Code: https://github.com/hyperledger/anoncreds-rs
  • Ledger Agnostic AnonCreds Project Page: https://github.com/orgs/hyperledger/projects/16

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• Welcome and Introductions
• Announcements:Request for a host for the meeting next week – Timo
• Updates the Agenda

Agenda

Open Issue

• PRs for review and merging
• Issues to Discuss
  • Revocation Interval
    • Further discussion from last week.
    • Approach to determine if the holder used an acceptable RevRegistry – see this Issue comment
    • Who calls the AnonCreds method to get the Revocation Registry for verification
      • Verifier or AnonCreds?
        • Stephen Curran claims it is the verifier, and therefore the verifier can decide if the provided NRP used an acceptable revocation registry
        • AnonCreds is NOT responsible for deciding if the right RevRegEntry was used – only if the NRP based on a given rev reg value is valid.
    • To set "validation" to true/false based on the RevRegEntry timestamp in relation to the revocation interval?  Presentation 
    • Key points:
      • 1. an RevRegEntry is “current” from the time it is written, to the time of the next RevRegEntry
      • 2. “within the interval” is based on when a RevRegEntry is “current” (see 1.), not its timestamp.
      • 3. AnonCreds or the Verifier (calling AnonCreds) should calculate “within interval” (using 2.) and mark verification true if the RevRegEntry used by the Prover is within the interval, else false.
        • Dangers:
          • False-Negatives: If a strict "timestamp used is between from, to" and not based on when a RevReg is "current" (per 2.), we will get "not verified" incorrectly.
          • False-Positives: If we don't do any checking of the timestamp and the interval, the holder could incorrectly use an old RevRegEntry.
      • 4. General point: AnonCreds should return both a summary (true/false) and if false, additional data about why it was false.
  • Issue #137 added regarding further investigation into what happens to the issuance data flow nonce(s) by Belsy
• Discussion: Mike Lodder has proposed that a group start on "Next Gen" AnonCreds based on his this recorded presentation at out 2022-11-28 meeting
• Checkin: anoncreds-rs implementation progress, requests
• Open Discussion

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