WG 2022 10 17

Agenda

Time: 7:00 Pacific (fixed), 16:00 Central Europe

Zoom Link: https://us02web.zoom.us/j/85188125213?pwd=UHRUVlgweFJ0T0g4SVdDUytYSkxJUT09

Recording:

Preliminaries

• Start Recording
• Reminder: Community Specification License v1.0 and Working Group Code of Conduct
• Welcome and Introductions
• Announcements:
  • IIW -- Nov 15-17, Mountain View, Calif.

Main Agenda

• Open PRs Review

  • General updates for consistency, and content updates.

• RevReg Object updates -- enabling AnonCreds Methods to support both deltas and "full state" RevReg storage

• To Do: Ankur to add paragraph about philosophy of the AnonCreds API, styles

• Creating/sharing AnonCreds verifiable credential and presentation objects in W3C VC Data Model format]

  • Script to convert verifiable credential back and forth - easy!
  • Script to convert AnonCreds presentation to W3C VC (or VP) - more interesting
    • Proof request has arrays of requests for revealed attributes, predicates, self-attested attributes
    • Holder selects credentials to satisfy the requests
    • AnonCreds groups all revealed attributes and predicates by source credential and generates a proof (primary+predicates) per credential (plus an aggregate proof)
    • Need to have a mapping from the requested attributes/predicates to the proofs

• Moving open source AnonCreds implementations out of Indy

  • This Thursday (Oct 20) Hyperledger Technical Oversight Committee Meeting -- 7:00 Pacific / 16:00 Central Europe
    • Zoom (if you want to join): https://zoom.us/j/91447530149?pwd=NWRNQ1BhRjhQd29GNTdUcmVSTWNKQT09
  • Project proposal here
    • Soon to go into this GitHub repo: https://github.com/hyperledger/hyperledger-hip

• What's left?

  • To Dos:
    • Review the Issuing and Presentation sections to exclude Legacy Indy impacts, and to formalize the Abstract API for writing/reading published objects
    • Cred Def Generation + PRIVATE_CRED_DEF -- non revocation, and plus revocation
    • Revocation data elements -- definition
    • Normative/Non-normative references
      • Collect from documents mentioned below (under action items) and from previous meetings

Action Items From Previous Meetings:

• Issue -- should "encoded" generation be handled by the Issuer or within AnonCreds?
  • Formalize the encoding in the specification
  • Transition to "encoding in AnonCreds" ASAP
• Links to be referenced in the spec and used where needed:
  • From Will Abramson : https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.186.5994&rep=rep1&type=pdf
  • From Will Abramson : https://github.com/hyperledger/indy-hipe/blob/c761c583b1e01c1e9d3ceda2b03b35336fdc8cc1/text/anoncreds-protocol/README.md
• From Artur Philipp : Issue about raw/encoded values used in AnonCreds https://jira.hyperledger.org/browse/IS-786
• Latex in Spec-Up / (Re)Discovery of AnonCreds Protocols paper from Mike Lodder, Brent Zundel. There is a full latex version of the document -- that document uses images to get the calculations into the text.