Interoperable digital wallets available

“It’s great to see many interoperable solutions,” says Harmen van der Kooij from FIDES Labs, the organization facilitating the FIDES Community. “This provides freedom of choice to wallet users and makes it easier for relying parties to provide services to a larger ecosystem.”

Many of the DIIP-compliant wallets are multilingual. “We’re happy to see that our partners in the Finnish digital credential ecosystems can now recommend a selection of wallets to their customers who can use them in their preferred language,” says Findynet’s CTO, Samuel Rinnetmäki.

The interoperability testing process is conducted in the FIDES Open Interoperability Testbed. The hosting and technical facilitation of the Open Testbed is provided by the University of the Aegean. Further coordination and co-funding is provided by FIDES Labs, iLabs, and the EU 3DxVerse project.

Broad community involvement through GitHub discussions has been very productive. “The active participation and input from wallet providers have been invaluable,” says Rinnetmäki. “We have also gathered lots of findings that can be used in the development of the next version of DIIP, scheduled to be published in January 2026.”

Van der Kooij welcomes all providers of digital credential solutions to the FIDES Open Testbed. “We have test suites for wallets, issuers, and verifiers. Testing for DIIP conformance in the testbed is a more effective way to find interoperability issues than bilateral testing against all other solutions individually”.

The DIIP-compliant mobile wallets are:

• Heidi Wallet by Ubique, Switzerland
• Paradym Wallet by Animo Solutions, the Netherlands
• Sphereon Wallet by Sphereon International, the Netherlands
• Toppan Wallet by Toppan Security, Japan
• UniMe by Impierce, the Netherlands
• YourD Connect by YourD, South Korea

As more wallet providers are implementing DIIP compliance, additional wallets are expected to be announced soon.

The Decentralized Identity Interoperability Profile (DIIP) defines requirements to enable interoperable issuance and presentation of digital credentials. The profile specifies the credential formats, signature algorithms, identifier schemes, protocols, and revocation mechanisms that conformant implementations must support.  The profile makes choices within the standards, defining which optional features must be supported.

The DIIP profile should be considered complementary to the OpenID4VC High Assurance Interoperability Profile (HAIP), which is used for person identification data within the EUDI Wallet ecosystem. Both profiles build on the OID4VC specifications. DIIP, however, explicitly focuses on the use of W3C Decentralized Identifiers (DIDs) and the Verifiable Credentials Data Model 2.0, enabling Linked Data-based interoperability and organizational (business) wallet use cases. This makes DIIP particularly relevant for ecosystems such as Gaia-X and Catena-X (data spaces), UNTP, CIRPASS-2 (Digital Product Passports), Digital Twins, and Open Badges.

FIDES Community is an international movement dedicated to the continuous improvement of digital trust on the internet. It provides Community Tools, Tracks, and coordination to explore, align, and test real-world applications together. FIDES Labs currently facilitates these collaborative efforts in a neutral and sustainable way.

Findynet Cooperative is a public–private partnership organization advancing, promoting, and building infrastructure for enhanced trust and more fluent online transactions.