Re: Reminder and Agenda for Confidential Storage Spec Call - Mar 11, 2021

Neil Thomson

As input to the discussion of [data] hub vs. the EDV sub-system  [secure data} services:


I’d suggest that the expectations I’m hearing across working groups (DIF, ToIP,…) on “data hubs” is that it is a basket of distributed data services packaged as a single point of contact for an organization (about their data) that includes, but is not limited to the following:


  • A collection of data exchange services which replaces customized point to point solutions for individual sources & targets
  • A data exchange broker between data sources and targets that may have different schema, semantics + languages, etc.
  • Provider of different data exchange types, including streaming, subscription, notifications and batch updates
  • Providing industry standard interfaces to data organized for different purposes and delivered in different ways
    • Raw – data lake
    • (real time) raw transactions as a stream (the same feed as populates the data lake)
    • Standardized transactions (common transaction schema)
    • Data event notification services (e.g., value from IoT device type X over threshold Y for period Z)
    • Operational data (transactions + transaction management logs) – which might use industry specific common schema
    • Analytical structured data (relational. dimensional , OLAP and data mining processed)
    • Standardized data exchange services, mapping/translating: data schemas, semantics, data types, formats, languages – based on the Human Colossus Foundation OCA – Overlay Capture Architecture model


Such a collection of data services is being promoted by several (not yet SSI/ZKP) offerings/solutions of “data hub” services and applications.


What differentiates that for SSI based Secured Data Services is: standards for  ZKP/encryptically secured data hubs.


  • From an EDV perspective (from what I have heard to in a few SDS wg meetings is), it:
    • It plugs into and is accessed - directly or indirectly (e.g., via co-located direct wallet access) via data hub services.
    • it is one of (and perhaps the most important) of the data sources/targets provided (transparently) to the clients using the data hub services


Thank you,

Neil Thomson


From: sds-wg@... [mailto:sds-wg@...] On Behalf Of Michael Herman (Trusted Digital Web)
Sent: March-10-21 7:27 PM
To: sds-wg@...;; Credentials Community Group <public-credentials@...>
Subject: Re: [sds-wg] Reminder and Agenda for Confidential Storage Spec Call - Mar 11, 2021


RE: 3. Review ‘Division of Responsibilities between Hubs and EDVs’ list, call for objections or additions. Proposed list so far:


Dimitri and WG colleagues,


I’d like to suggest either before tomorrow’s SDS WG call or, as an early part of the call, that we establish a few things we don’t have:

  1. A working/workable definition of/simple litmus test for what a [Identity] Hub is?
  2. A working/workable definition of/simple litmus test for what an Encrypted Data Vault (EDV) is?
  3. That is, two definitions that clearly contrast these 2 terms.


Without the above, I believe it is difficult (impossible) to continue with agenda item #3 with any additional depth.  After completing a description of the lengthy Distributed Twitter (Dewitter) app scenario, I know what an EDV is but I didn’t need and don’t expect to need anything called a Hub. I have no idea what a Hub is or if the Hub concept is even needed.


To facilitate this discussion, can someone (e.g. @DanielB) take a stab at drawing a boundary what might be considered to be an [Identity] Hub?  I’ve attached the PPTX source slide as well as a rendered image (below).



Is this a reasonable request?  Can we agree to precede the agenda item #3 discussion with an initial determination of these 2 definitions: EDVs and [Identity] Hubs?


Best regards,



From: sds-wg@... <sds-wg@...> On Behalf Of Dmitri Zagidulin
Sent: March 8, 2021 7:59 PM
To:; Credentials Community Group <public-credentials@...>
Subject: [sds-wg] Reminder and Agenda for Confidential Storage Spec Call - Mar 11, 2021


Dear all,

This is a reminder that the DIF / CCG Secure Data Storage Working group weekly call will be happening on Thursday at 4pm Eastern / 1pm Pacific / 22:00 CEST.

Meeting link:

Specification repository:

Audio recordings and transcripts of previous meetings:

As always, the IPR policy requires that you can only make substantive contributions if you sign the IPR Release Form. Please follow the instructions at

Confidential Storage Spec Call Agenda

1. IPR Reminder
2. Introductions and Re-Introductions

3. Review ‘Division of Responsibilities between Hubs and EDVs’ list, call for objections or additions.

4. Issue review


Thank you,

The Chairs

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