iGrant.io and University of the Aegean present Large-Scale Pilot interoperability at OpenWallet Foundation WISIG

Specifications promise interoperability; large-scale deployments are where you find out whether it holds. That is the experience iGrant.io and the University of the Aegean bring to the OpenWallet Foundation Wallet Interoperability Special Interest Group (WISIG), presenting together what the EU Large-Scale Pilots reveal about making EUDI Wallets, issuers, and verifiers work together in the real world.

The OpenWallet Foundation, a project of the Linux Foundation Europe, brings together developers, standards bodies, academia, and ecosystem stakeholders to build a trusted digital future on open, standards-based components. Issuers, wallet providers, and relying parties reuse these building blocks to ship secure, privacy-preserving wallets rather than reinventing the plumbing each time.

WISIG carries that mission into the messy middle ground between standards and shipping code. The group defines, publishes, and tests Wallet Interoperability Profiles (WIPs): practical, testable descriptions of how wallets should issue, hold, present, and verify credentials across the main technical stacks in play today, namely AIP 2.0, OpenID4VCs, and mDL/mDocs.

Highlights of the session

• Session: Interoperability and conformance testing for the eIDAS 2.0 era and beyond
• Date: Monday, 1 June 2026, 17:00 CET
• Location: Online

Interoperability lessons from the Large-Scale Pilots

In this session, Lal Chandran from iGrant.io, together with Nikolaos Triantafyllou and Petros Kavassalis from the University of the Aegean (UAegean), present their interoperability experience from the EU Large-Scale Pilots (LSPs), including the EU Digital Identity Wallet Consortium (EWC) and the WE BUILD Consortium. Drawing on running EUDI Wallet deployments, they show how interoperability moves from a paper requirement to a demonstrated property: how wallets, issuers, and verifiers are exercised against Wallet Interoperability Profiles in shared test beds, where the gaps surface in practice, and how those findings feed back into the profiles and into conformance testing for the eIDAS 2.0 era and beyond.

Why interoperability decides whether wallets scale

As EUDI Wallet and EU Business Wallet ecosystems move from pilots towards production, the EU Digital Identity Wallet’s success rests on more than regulation and specifications. It depends on whether wallets, issuers, verifiers, and relying parties interact reliably in real deployments, whether the holder is a citizen, a professional, or a legal entity.

For organisations preparing to adopt the EUDI Wallet, that technical consistency is a procurement question as much as an engineering one. Shared profiles ease integration, cut implementation uncertainty, and give teams an objective way to check whether a wallet solution behaves as expected across standards and use cases before they commit to it.

What iGrant.io brings from the pilots

This is grounded in delivery, not theory. Through the EWC and WE BUILD Large-Scale Pilots, alongside its own EUDI Wallet conformance testing, cross-wallet validation, and live deployments via the Organisation Wallet Suite (EU Business Wallet for organisations) and the Data Wallet for individuals, iGrant.io has met the practical interoperability issues first-hand. Bringing that experience to WISIG helps the profiles reflect production reality and helps the wider ecosystem converge faster.

About iGrant.io

iGrant.io is a Swedish software provider of the Data Wallet (EU Digital Identity Wallet) for individuals and the Organisation Wallet Suite (EU Business Wallet) for businesses and public sector organisations, enabling individuals and organisations to securely manage, issue, verify, and share digital credentials. iGrant.io actively contributes to European digital identity initiatives, EUDI Wallet interoperability programmes, and eIDAS 2.0-aligned wallet ecosystems.

▶️ Watch the demo on YouTube: Onboarding with EUDI Wallets. Read our article on the European Business Wallet and its use cases for regulated industries.

Download the EUDI Wallet Data Wallet for individuals and try our demo use cases.

Contact [email protected] for more information.