
Interoperable decentralized identity and wallet infrastructure


Coach Name
Jordi Bosch Garcia
EU Organization
walt.id GmbH
Members
- Dominik Beron
- Phil Potisk
- Severin Stampler
- Kevin Burgmann
- Tamino Baumann
- Mike Plotean
- Dinkar Jain
- Khaled Battiche
- Justin Davreaux
CA Organization
AffinitiQuest
Members
Project Overview
The DDIP (Decentralized Digital Identity Profile) project addresses the growing demand for secure, interoperable, and user-centric digital identity solutions across borders. By creating a standardized framework rooted in decentralized identity protocols, DDIP offers organizations, governments, and users an accessible and reliable digital identity model. The project leverages open-source technology and protocols to facilitate secure issuance, management, and verification of digital identities and credentials, enhancing user autonomy and privacy while adhering to regulatory standards.
The DDIP project is particularly aligned with the needs of organizations that handle sensitive data and require strong compliance frameworks, such as GDPR, to ensure data sovereignty and privacy. This project represents a significant step towards bridging interoperability gaps in digital identity infrastructure, positioning itself as a foundational component of a global digital identity ecosystem.
Methods and approaches
Interoperability Testing
Back-end components essential for interoperability were implemented and rigorously tested, ensuring smooth integration between decentralized identity systems.
Technical Requirement Definition:
The teams reviewed architectures, credential standards (e.g., Decentralized Identifiers, Verifiable Credentials), and protocols to ensure technical feasibility and alignment for cross-border interoperability.
Open-Source Community Engagement
Active participation in global events such as the OpenID Foundation and eIDAS2, which helped refine decentralized identity solutions and ensured alignment with global standards.
Open-Source Community Engagement
Active participation in global events such as the OpenID Foundation and eIDAS2, which helped refine decentralized identity solutions and ensured alignment with global standards.
Key Achievements
Project Roadmap and User Journey Definition
Successfully defined the business context and user flows, establishing a clear roadmap and distribution of responsibilities between European and Canadian teams.
Technical Documentation for Implementers
Produced detailed technical documentation to facilitate community adoption and the reuse of the open-source project, supporting broader implementation efforts.
Backend Technology for Interoperability Testing
Implemented back-end components crucial for interoperability testing, ensuring effective coordination between both teams.
Application Development for Interoperability Demonstration
Developed and rigorously tested user-friendly applications and front-end interfaces to demonstrate real-world interoperability and facilitate intuitive interactions.
Impact & Results
Scientific Impact
The project contributed to advancing decentralized identity solutions by validating the technical feasibility of cross-border interoperability between European and Canadian identity systems.
Economic and Social Impact
By offering an open-source, interoperable solution, INTEROP4DID empowers smaller vendors and end-users to engage with decentralized identity ecosystems. The demonstrated use cases exemplify the project’s potential in the travel industry, where identity verification and secure data exchange are crucial.
Team Expansion and Job Creation
Although not solely driven by this project, walt.id expanded its team, adding three full-stack developers who contributed to product development and community engagement.
Long-Term Collaboration
The project fostered lasting partnerships, with Canadian organizations continuing to explore applications of walt.id’s solutions in government and commercial identity initiatives.
Publications and Open-Source Contributions
INTEROP4DID’s open-source software can be found in our GitHub
Additional publications related to the project:

Future directions
In its next phase, INTEROP4DID will extend beyond the travel sector to support cross-border digital identity in government and commercial use cases. By introducing new credential types, strengthening privacy features, and collaborating with the open-source community, the project aims to accelerate global adoption of decentralized identity solutions.