[DPP R24.08] Digital Product Pass Verification Add-on v2.1 Documentation & CertifiedDataCredential Implementation Released!

[matbmoser]

Introduction

If you have already saw in the previous release, the Digital Product Pass Verification initial documentation [v1.0] was already released in the R24.05! It gave guidelines on how to certify and verify the aspects!

Howewer, you have probably saw some messages like this:

or

and now... They are gone!

The documentation is now complete and it's really detailed! It contains explanations and real test data which can be used for the implementation of this Catena-X Data Certification/Verification Framework!

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Changelog

Structural Changes

Based on the feedback from existing readers, we have reordered some sections, so that the documentation reading flow it optimized, allowing you to understand step by step, what do you need to understand the concept, what is it about and how to implement it.

Typos Fixed

There were several spelling mistakes that were fixed so that the reading can be easily done. Also, some more technical wording was now added to the glossary, to ease the understanding.

New Sections

We have added some new sections that were not there yet in the previous version

• Knowledge Prerequisites
  • Allowing you to understand, where can you find base knowledge resources to understand the documentation better.
  • Also, the "Abstract" header was renamed to "Introduction" which matched more with the content of the text.
• Scope
  • We have defined a better scope for you to understand better the goals and objectives of the concept.
  • We also added a Context Diagram which shows what is the concept aiming.
• Previous Investigation
  • Now the previous investigation is there! Containing the resumed findings when we broadcasted the Tractus-X Community for their requirements and "needs" of a verification concept.
• Trust and Value of having certified aspects
• We have added a section that explains what is the real value of having certified aspects instead of plain JSON payloads.
• Verification Processes
  • The same way as the Certification Process, now the Verification Process is also available, defining the actions that are done by each actor in order to verify the complete aspect, or just some attributes in case of the auditor
• Technical Specification
  • This section is now really detailed, so that with examples and technical specifications the implementation and understanding of the technical structure of the models can be easier done.
  • Detailed Description of how Certification Aspects Specification can be done.
  • How does a Certified Snapshot Credential Schema looks like.
  • How does a Attribute Certification Record Schema looks like.
• Technical Integration Design
  • The technical integration design contains the explanation of how the integration in between different systems like Digital Twin Registry, Simple Wallet and other different systems can be done. It also reveals how in this release r24.08 new components like the simple-wallet were developed to enable the implementation of the concept.
  • Digital Twin Configuration Shows you how to configure the Digital Twins for enabling the verification aspects like CDC and ACR.
• Verification Implementation in the Digital Product Pass
  • Shows the demonstrator and implementation that was done in the Digital Product Pass during this R24.08. It shows the user manual for the frontend and how it was implemented, challanges that we faced when implementing the concept, api specification a sequence diagram explaining how it is done, and much more!
• Additional Information
• Since the Verification Aspects can be also verified/certified in type level, during the previous investigation it was investigated with the Industry Core team how to link digital twins in type level: Linking Digital Twins in Type Level
• There you will find the decision on how to do the linking to find from instance to type and type to instance digital twins.
• Also there was added a proposal for how to link Type to Type digital twins with linking submodel aspects.

Simple Wallet Component

In order to implement the concept a MVP identity wallet needed to be developed! It uses the Gaia-X standards and is based in the functionality of the Managed Identity Wallet tractus-x component.
It allows data providers to generate JSON-LD contextes from SAMM JSON Schemas. It also allows to issue and verify verifiable credentials with version v2 and JsonWebSignature2020. Its a functional wallet that can retrieve also JsonWebKey2020 public keys from DID Methods, resolving the DID Web ids.

The simple wallet docs can be found here

Backend and Frontend Implementation

It was implemented the Certified Data Credential Verification flow in the Digital Product Pass Application. In this way, complete aspect model payloads can be Certified using a "provider" simple-wallet and verified using the DPP, that will call its own "consumer" simple-wallet, doing the verification decentrally using DID methods.

More details in Verification Implementation in the Digital Product Pass.

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We hope this documentation and implementation can serve as lighthouse for all the Catena-X Network!

It should really be a Catena-X Data Certification/Verification Framework, not just to the Digital Product Passport, but for all Catena-X!

Feel free to add your feedback here!

Happy Reading!

Mathias Brunkow Moser
Digital Product Pass Software Architect