A minimum viable architecture for eIDAS 2.0 compliance consists of four core components: a verified identity layer, at least one integrated qualified trust service, a relying party registration mechanism, and a connection point for EUDI Wallet interactions. You do not need to implement every element of the full framework to become compliant — but you do need to cover these foundations before you can legally accept or issue identity data under eIDAS 2.0. The sections below walk through each building block, the trade-offs between minimal and full compliance, and the practical steps to get started.

What components make up an eIDAS 2.0-compliant architecture?

An eIDAS 2.0-compliant architecture is built around four interconnected layers: identity verification and issuance, trust service integration, wallet interoperability, and a policy and audit layer. Together, these layers allow your organization to issue, receive, and verify digital identity data in a way that meets the legal and technical requirements set by the updated regulation.

The Architecture and Reference Framework (ARF), developed by the European Digital Identity Cooperation Group (EDICG) and the European Commission, defines the technical specifications that underpin the entire ecosystem. These specifications cover everything from how credentials are formatted and exchanged to how wallet solutions are certified and how relying parties are registered.

In practical terms, a compliant architecture needs to handle the following:

• Identity proofing and credential issuance: verifying who a person or organization is and issuing cryptographically signed credentials
• Trust service integration: connecting to qualified trust services such as qualified electronic signatures (QES) or qualified electronic attestations of attributes (QEAAs)
• Relying party registration: formally registering your organization as a party that requests and accepts identity data from wallets
• EUDI Wallet compatibility: implementing the protocols and interfaces required to interact with certified wallet solutions
• Audit and evidence trail: maintaining tamper-proof records of identity transactions to support compliance reporting

The good news is that you do not need to build all of this yourself. Many organizations work with specialist providers who already have the certified infrastructure in place, which significantly reduces time to production and compliance risk.

What is the difference between a minimum viable and a full eIDAS 2.0 architecture?

A minimum viable eIDAS 2.0 architecture covers the components required to legally accept wallet-based identity credentials and issue basic attestations. A full architecture extends this to cover all supported use cases, including cross-border identity matching, advanced attribute sharing, qualified preservation services, and deep integration with sector-specific compliance requirements.

The distinction matters because organizations often feel pressure to implement everything at once. In reality, a phased approach is both practical and permitted. A minimum viable setup allows you to meet your immediate regulatory obligations, test your processes, and build confidence in the ecosystem before expanding.

A minimum viable architecture typically includes:

1. Relying party registration with the relevant national authority
2. Integration with at least one qualified trust service provider (QTSP)
3. Support for the core wallet protocols defined in the ARF (protocols and interfaces)
4. A basic credential verification flow with an audit trail

A full architecture adds layers such as cross-border identity matching, support for multiple credential formats, integration with sector-specific attestation schemes, and automated policy enforcement at scale. Most organizations will grow into this over time rather than deploying it all upfront.

Which eIDAS 2.0 trust services must be integrated from the start?

From the start, organizations must integrate with trust services that directly support their core use case. For most organizations, this means connecting to a Qualified Trust Service Provider (QTSP) for at least one of the following: qualified electronic signatures (QES), qualified electronic attestations of attributes (QEAAs), or qualified electronic registered delivery services (QERDS).

The eIDAS 2.0 regulation introduces several new categories of qualified trust services beyond those in the original eIDAS framework. These include qualified electronic ledgers, qualified electronic archiving services, and qualified remote signing and sealing. Not all of these are required from day one, but those that support your primary compliance obligation should be in place before you go live.

For organizations in financial services, qualified electronic signatures and strong customer authentication integration are typically the most urgent. For public sector bodies, the priority is often issuing and accepting person identification data (PID) and electronic attestations of attributes (EAAs). For healthcare organizations, consent-linked signatures and secure attribute sharing tend to be the primary focus.

The practical starting point is to identify which trust services your specific use case requires, confirm that your chosen QTSP is listed on the EU Trusted List, and ensure your integration follows the implementing regulations covering protocols, interfaces, and certification requirements.

How does the EUDI Wallet fit into a minimum viable architecture?

The EUDI Wallet fits into a minimum viable architecture as the primary channel through which users present verified identity credentials to your organization. In technical terms, your system needs to function as a registered relying party — a service that can request and verify credentials from a certified wallet, without storing more data than necessary.

Member states are legally required to make at least one certified EUDI Wallet available to all citizens, residents, and businesses by 24 December 2026. Public sector bodies and public service providers are also required to accept notified wallets as a means of identification from that date. For private organizations in regulated sectors — including banking, healthcare, telecoms, energy, transport, education, social security, drinking water, postal services, digital infrastructure, digital services, and very large online platforms with more than 45 million users in the EU — the obligation to accept the EUDI Wallet applies from 24 December 2027, within contexts where strong user authentication is legally or contractually required. The 2026 deadline is therefore an important milestone for testing wallet interactions and preparing your systems ahead of your own acceptance deadline.

For your architecture, integrating EUDI Wallet support means implementing the protocols and interfaces defined in the ARF. This includes support for the OpenID4VP and OpenID4VCI protocols, which govern how credentials are presented and issued. Your system also needs to handle selective disclosure — the wallet’s ability to share only the specific attributes you need, rather than a full identity document.

This selective disclosure capability is one of the most significant user-facing benefits of the wallet model. A user proving their age does not need to share their full date of birth, address, or document number. Your architecture should be designed to request only the minimum necessary attributes, both for regulatory compliance and to build user trust. Explore the available solutions to see how this can be implemented in practice.

What are the biggest compliance gaps organizations face when building for eIDAS 2.0?

The biggest compliance gaps organizations face when building for eIDAS 2.0 are relying party registration delays, underestimating the certification requirements for wallet interactions, and failing to establish a tamper-proof audit trail from the start. These gaps are not always visible until an organization tries to go live, which is why early architecture decisions matter.

Registration as a relying party is a formal process governed by implementing regulations. Many organizations assume they can handle this late in the project, but delays in registration can block your entire go-live timeline. This should be treated as a parallel workstream, not a final step.

A second common gap is underestimating what it means to be “wallet-ready.” Supporting the EUDI Wallet is not simply a matter of adding an API connection. It requires certified protocols, correct credential format handling, and alignment with the ARF specifications. Organizations that build on uncertified infrastructure risk non-compliance even if their user experience looks correct.

The third gap is the audit trail. eIDAS 2.0 requires that identity transactions are verifiable and that evidence of compliance is maintained. Many existing systems were not designed with this requirement in mind. Retrofitting an audit layer after the fact is significantly harder than building it in from the beginning.

Other gaps worth noting include insufficient attention to cross-border identity matching requirements, incomplete handling of attribute revocation, and a lack of clarity around which national supervisory body governs your specific trust services.

When should organizations start building their eIDAS 2.0 architecture?

Organizations should start building their eIDAS 2.0 architecture now. With the EUDI Wallet rollout deadline set for 24 December 2026 and implementing regulations already in force, the window for preparation is narrowing. Organizations that wait until compliance becomes mandatory risk rushed implementations, missed registrations, and costly retrofits.

The regulatory timeline has moved faster than many expected. The large-scale pilot programs concluded their core testing phase, the ARF has been updated to reflect the adopted implementing regulations, and member states are progressing toward wallet availability by the December 2026 deadline. This means the technical specifications are no longer moving targets — they are stable enough to build against.

A practical starting point is a readiness assessment: map your current identity infrastructure against the minimum viable architecture requirements, identify your primary use case, and determine which trust services and wallet interactions you need to support. From there, you can prioritize your build sequence and avoid over-engineering in the early stages.

Organizations in regulated sectors such as banking, healthcare, telecoms, energy, transport, education, social security, drinking water, postal services, digital infrastructure, and digital services face additional urgency because sector-specific requirements — including the acceptance obligation under Article 5f of the eIDAS 2.0 regulation, which takes effect on 24 December 2027 — layer on top of the baseline obligations. The earlier you start, the more time you have to align your compliance, legal, and technical teams before deadlines arrive. You can find sector-specific guidance for government organizations and other regulated industries to help frame your planning.

How TrustTech helps with eIDAS 2.0 compliance

Building an eIDAS 2.0-compliant architecture involves navigating a complex set of technical specifications, regulatory requirements, and integration challenges. TrustTech is designed to make that process practical and manageable for organizations across regulated sectors.

TrustTech provides the infrastructure and expertise to help you build and operate a compliant digital identity architecture, including:

• Verified identity and credential issuance — cryptographically signed credentials tied to your users’ verified identity, ready for wallet-based interactions
• Qualified trust service integration — seamless connection to qualified electronic signatures, attestations, and other trust services required under eIDAS 2.0
• EUDI Wallet readiness — built-in support for the protocols and interfaces defined in the ARF, so your systems can interact with certified wallets from day one
• Reusable compliance flows — onboarding and verification processes that can be reused across interactions, reducing friction and repeat checks
• Audit-ready evidence trail — tamper-proof records of every identity transaction to support regulatory reporting and supervisory requirements

TrustTech works with organizations in finance, government, healthcare, and other regulated sectors, combining deep technical knowledge with practical implementation experience. Whether you are starting from scratch or updating an existing architecture, TrustTech helps you move from complexity to clarity. Get in touch to discuss your eIDAS 2.0 readiness and find out what your next step should be.