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Subject: XDI TC Unofficial Telecon Notes: Monday 2018-04-09

XDI TC Notes

Following are the notes of the unofficial telecon of the XDI TC held on:

Date: Monday, 9 April 2018 USA
Time: 9:00AM - 10:00AM Pacific Time (16:00-17:00 UTC)

The TC operates under a standing rule approved 17 July 2008 under which the TC does not hold regular official meetings and conducts all business by electronic ballot only. Unofficial weekly meetings are held to enable discussion among members but no business is conducted nor actions taken.


Drummond Reed
Markus Sabadello
Phil Windley
Joseph Boyle


Report from Internet Identity Workshop #26

Drummond, Phil, Joseph and Markus were are IIW #26 in Mountain View. Major topics included DIDs, DID Auth, Agents, Zero-Knowledge Proofs, and others. Another subject was convergence of different efforts such as Agents with Hubs, or Zero-Knowledge Proofs with JSON-LD Verifiable Credentials.

Markus talked about the CULedger project and how it will be using XDI. This network involves the Sovrin ledger, a Swirlds hashgraph-based ledger, and XDI for communication between the nodes of the CULedger network.

We discussed how the participants in the CULedger network would have DIDs and DID documents that contain XDI endpoints. Some of those DID documents would also contain Sovrin agent endpoints so they can speak the Sovrin protocol.

Markus is also looking at a proof-of-concept in Austria between several banks and insurance companies where the KYC information needed by the banks can be reused by the insurance companies. It also involves a change-of-address from the Post Office to the others.

In this POC, the Sovrin protocol is only used for discovery of DIDs and DID documents and XDI is used for all other data exchange. This is because in some areas, the Sovrin protocol is redoing various features of XDI, such as link contract requests and offers. There are other areas where the Sovrin protocol is more advanced, such as the use of default pairwise pseudonymous DIDs and zero-knowledge proofs (ZKP) for privacy protection.

Markus is still looking at the two protocols separately in the context of the CULedger project. In the Austrian project, he is currently just using XDI.

Markus is anticipating how Sovrin proofs could be inputs to XDI link contract policies.

We discussed the need to model digital credentials in XDI to meet the same requirements being addressed by the W3C Verifiable Claims Working Group. The basic pattern would be that the credential is a signed XDI graph sent from the issuer to the holder, and then the holder would present this XDI graph inside an inner graph containing the holder’s countersignature to a verifier. This basic structure would not have the properties of the zero-knowledge proof crypto in the Sovrin protocol; incorporating those would be another set of transformations to these graph structures.


The next call will be next week at the usual time (Monday 9AM PT). The link where agenda items can be posted for the next meeting is: https://docs.google.com/document/d/19oDl0lbb56Grehx2a5flZnhrgnua5l8cVvC_dJ8fTXk/edit?usp=sharing

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