Digital Certificate, Electronic ID (DNIe), and Blockchain: Toward a More Robust and Verifiable Digital Identity

At a time when the digital transformation of government and private services is advancing rapidly, digital identity has emerged as a key component. Thanks to regulations such as Regulation (EU) 2024/1183, commonly known as eIDAS2, and the development of solutions such as digital identity wallets, citizens, businesses, and public administrations now operate within a regulated environment that enables secure identification, legally valid signatures, and cross-border credential sharing.

This article examines how three core elements—digital certificates, the electronic national identity card (DNIe), and blockchain-based technologies—can coexist and complement one another to build a stronger, more interoperable digital identity ecosystem that is better prepared to meet current challenges.

Each technology provides distinct value. A digital certificate offers a cryptographic key linked to a verified identity, making it useful for signing electronic documents and authenticating users in administrative or business procedures. The electronic ID card (DNIe) adds physical security through an embedded chip, reducing the risk of impersonation or fraud. Blockchain-based credentials, in turn, enable portability, user control, traceability, and verifiable attributes. Together, these technologies deliver a broader spectrum of functionalities than any single solution could guarantee on its own.

The challenge is not only technical, but also one of usability and trust. By integrating these technologies, it becomes possible to offer a coherent user experience in which the individual:

Authenticates with a verified identity (digital certificate or DNIe).

Signs digitally with full legal validity.

Manages verifiable, portable credentials under their own control, with full regulatory compliance.

This approach benefits citizens, businesses, and public administrations alike by streamlining procedures, reducing friction, enhancing security, and enabling mobility within the European framework.

Beyond the regulatory framework and the individual capabilities of each technology, what matters most is that they operate in a coordinated way in real-world environments. Citizens should not have to decide whether to use a certificate, the DNIe, or a blockchain-based credential; they should simply be able to identify themselves, sign, or present documentation seamlessly..

Digital Certificate

A digital certificate, issued by recognized trusted authorities, enables users to electronically sign documents, authenticate their identity, and carry out online procedures with full legal validity. Its versatility makes it suitable for numerous use cases, including contracts, electronic invoices, and public administrative processes. Its main limitation lies in portability: it is often tied to a specific device or browser, which can make its use on mobile devices or in highly mobile environments more complex.

Electronic National Identity Card (DNIe)

The electronic ID card (DNIe) incorporates a cryptographic chip that stores authentication and signature certificates. This combination provides a high level of security against impersonation, making it particularly suitable for sensitive procedures. However, it requires compatible hardware, such as a card reader, which can affect the user experience—especially when accessing services from mobile devices or in uncontrolled environments.

Blockchain: Decentralized Identity, Verifiable Credentials, and European-Scale Traceability

Blockchain-based solutions introduce a layer not provided by either digital certificates or the DNIe: decentralized identity and verifiable credentials (VCs) that can be validated by any entity without the need for intermediaries. This makes it possible to issue and share attributes, degrees, licenses, permits, or professional data that users control directly from their own digital identity wallet.

Within the framework of the eIDAS2 Regulation and the EU Digital Identity Wallet, these credentials play a central role: they are portable, interoperable across EU Member States, and verifiable within seconds. Moreover, cryptographic traceability helps detect alterations and strengthens document integrity, enabling a more secure, interoperable digital identity model prepared for cross-border services.

The main limitation today is still early-stage adoption and the need for both issuers and verifiers to adapt to these emerging technologies.

Friction in digital procedures: In many cases, a service accepts digital certificates but not the DNIe, or works properly on desktop computers while presenting issues on mobile devices. This lack of consistency in the user experience generates frustration, undermines trust, and hinders large-scale adoption by both citizens and businesses.

Complex renewal processes and technological dependency: Digital certificates and the DNIe have limited validity periods. Renewing them may involve cumbersome procedures, sometimes even in person, and may require specific hardware or reconfiguration on new devices. This technical dependency is impractical in highly mobile contexts, such as remote users or organizations with frequent equipment changes.

Lack of cross-border recognition: The absence of common standards among Member States prevents a digital identity from being automatically valid across the EU. This limits mobility and slows down cross-border processes. The European Digital Identity Wallet emerges as a response to this challenge, establishing an interoperability framework that ensures mutual recognition and simplifies the use of digital identities throughout Europe.

An integrated flow could operate as follows: a user authenticates with their digital certificate or DNIe, signs a contract with full legal validity, and then—either simultaneously or subsequently—generates a verifiable credential registered on a blockchain. That credential can be used to prove identity, licenses, permits, or professional certifications, with portability, security, and cross-border recognition.

By using blockchain to register only the cryptographic fingerprint of a document (its hash), the document’s content is not exposed. Yet it remains possible to prove its existence, issuance date, signature, integrity, and validity. This adds a third dimension of trust: traceability and non-repudiation, without compromising privacy. This approach is particularly valuable in high-risk, regulated contexts or scenarios involving multiple verifiers.

For regulated procedures or critical transactions, combining a qualified electronic signature as defined under eIDAS2 with registration on a trusted blockchain network provides a dual layer of assurance: both legal and technical security, enhanced traceability, and resistance to tampering.

What Do eIDAS2 and the EUDI Wallet Establish?

Regulation (EU) 2024/1183 updates the original eIDAS framework to establish a pan-European digital identity system. Among its key developments:

Obligation for Member States to provide at least one European Digital Identity Wallet to citizens, residents, and businesses.

Mutual recognition: electronic identification means issued in one Member State must be accepted in any other.

Trust services: electronic signatures, seals, time-stamping, issuance and validation of attributes, secure storage, and compliance with privacy and cybersecurity standards.

The European wallet places control of personal data in the hands of the user, who decides what to share, with whom, and when. The technical standards defined in the framework ensure interoperability among Member States and across private and public platforms.

This marks a decisive step toward a truly usable, trustworthy, and cross-border digital identity—essential for mobility, the digital economy, and institutional trust across the European Union.

For this vision to materialize, reliable technical infrastructures—public or public-private—are required to implement standards, ensure interoperability, and provide stable service delivery.

In this context, ISBE (Infraestructura de Servicios Blockchain de España) stands out as a national initiative designed to offer document integrity services, digital identity capabilities, traceability, and verifiable credentials aligned with the European framework.

Through a public-permissioned network model—featuring controlled nodes, shared governance, and regulatory compliance—ISBE can operate as a layer of technical and legal trust, connecting national certificates, the European Digital Identity Wallet, and verifiable credentials. This would enable digital identity—whether for citizens, businesses, or public administrations—to be operational, verifiable, and durable over time.

A hybrid and interoperable ecosystem delivers tangible benefits:For citizens: a reusable digital identity, European mobility, greater control over personal data, and reduced dependence on in-person or paper-based procedures.

For businesses: lower administrative costs, automated onboarding processes, rapid identity and credential verification, simplified regulatory compliance, and the ability to operate seamlessly across borders.

For public administrations: more agile processes, reduced operational costs, lower fraud exposure, enhanced institutional trust, improved traceability, and a better overall user experience.

In addition, this approach reduces national system fragmentation, strengthens European interoperability, and reinforces digital sovereignty.

Digital identity should not be viewed as an isolated technology, but as an ecosystem. Combining digital certificates, the DNIe, and blockchain-based credentials—supported by trusted infrastructures and aligned with the eIDAS2 regulatory framework—offers a realistic, coherent, and scalable model.

This is not a futuristic bet; it is a practical roadmap toward an operational and trustworthy European digital identity.

Do you work with digital identity or electronic signature solutions?
Integrate certificates, the DNIe, and blockchain-based credentials to deliver a secure, Europe-aligned user experience.