Why Signing Portals Have Identity Check Gaps

Most enterprise signing portals verify a document was signed. Fewer verify who signed it. That gap, between the act of signing and the proof of identity behind it, is where disputes, failed audits and regulatory exposure accumulate.

If your organisation runs signing workflows through one platform and identity checks through another, the two rarely produce a single, auditable evidence chain. ZealiD, an eIDAS Qualified Trust Service Provider, builds identity verification directly into the signing workflow to close this gap.

This article explains why the inconsistency happens, what it costs, and what structural change looks like.

Key Takeaways: Identity Check Gaps in Signing Portals

• Signing portals and identity verification systems often operate as separate, disconnected workflows with no shared evidence chain.
• When authentication and signing run on different platforms, audit trails fragment and disputes become harder to defend.
• eIDAS requires qualified trust service providers to verify the signer's identity before issuing a qualified certificate.
• ZealiD binds identity verification directly to the signing event, producing a single auditable record of who signed.
• Enterprises that unify identity proofing and signing reduce regulatory exposure and cut the cost of handling disputes.

What Is Authentication Inconsistency in Signing Portals?

Authentication inconsistency occurs when the method used to verify a signer's identity does not match the assurance level of the signature itself. A qualified electronic signature (QES) carries the highest legal weight under eIDAS Regulation (EU) No 910/2014. But the signature is only as strong as the identity check behind it.

Many enterprise signing portals rely on email-based authentication. The platform sends a link, the recipient clicks it, and the system records a signature event. That process proves someone with access to an inbox performed an action. It does not prove a specific natural person was present.

Why Do Identity Verification and Signing End Up in Separate Systems?

Procurement is the most common reason. Your organisation likely bought a signing platform for contract execution and a separate identity verification service for onboarding or KYC. The two systems are purchased at different times, owned by different teams and governed by different policies.

The signing platform records that a document was signed at a given timestamp. The identity system records that a person was verified on a different date. No single record links the verified identity to the signing event.

When a counterparty or regulator asks for proof, the enterprise must stitch together logs from two systems and hope the timestamps and session identifiers align. That fragmentation is a consequence of treating identity and signing as two separate procurement decisions.

What Does eIDAS Require for Identity Proofing Before Signing?

Article 24 of the eIDAS Regulation requires a qualified trust service provider (QTSP) to verify the identity of the person to whom a qualified certificate is issued. Regulation (EU) 2024/1183 clarifies the acceptable methods: a European Digital Identity Wallet, a notified eID at assurance level high, an existing qualified certificate, a conformity-assessed identification method, or physical presence.

Commission Implementing Regulation (EU) 2025/1566 sets the reference standards for that verification. It requires equivalent treatment across all QTSPs.

When a signing portal delegates identity verification to a third party without a certified binding to the signing event, the chain breaks. The signature may be technically valid, but the evidence trail may not satisfy the implementing regulation's requirements.

How Fragmented Audit Trails Create Regulatory Exposure

A signing platform generates an audit log: document hash, timestamp, IP address, email of the signer. An identity verification provider generates a separate record: document scan result, liveness check, proofing level. If these two records do not reference each other, an auditor sees two independent assertions rather than one continuous chain.

Under the Anti-Money Laundering Regulation (AMLR), which applies from 10 July 2027, regulated entities must demonstrate they know who they are dealing with. A signing event without a linked identity check may not meet that standard. The same logic applies under GDPR and NIS2.

ZealiD addresses this directly. Because ZealiD issues the qualified certificate and performs the identity proofing as a single certified service, the audit trail is one record. The identity verification, the certificate issuance and the signing event share the same session and the same conformity assessment.

Where Email-Based Authentication Falls Short

Email authentication proves control of an inbox. It does not prove identity. An attacker with a compromised mailbox can sign a document, and the audit log will show no anomaly. A colleague with shared mailbox access can sign on someone else's behalf.

These are not theoretical risks. ENISA's Remote ID Proofing Good Practices report catalogues the attack surface that opens when proofing is decoupled from the transaction it supports. A 2026 vulnerability in an open-source signing platform (CVE-2026-92794) confirmed the pattern: disabling one-time-password verification allowed unauthenticated retrieval of signer information because identity checks were optional, not structurally bound to the signing event.

When the identity check is built into the qualified signature itself, inbox access alone cannot produce a valid signature. The signer must complete a liveness selfie and document scan tied to the signing event.

What Trust Service Design Means for Portal Security

A trust service under eIDAS creates, verifies or validates electronic signatures, seals, timestamps or certificates. A qualified trust service meets additional requirements: conformity assessment, national supervision and listing on the EU Trusted List.

Most signing portals are not trust services. They are document workflow platforms that integrate with one or more QTSPs for the cryptographic layer. That architecture introduces a handoff: the portal manages the workflow, and the QTSP handles identity and certificate issuance.

When the handoff is loose, the QTSP must trust the portal's claim about who is requesting the signature. If that claim is wrong, the qualified certificate is issued to the wrong person, and the signature is worthless in court.

How Unified Identity and Signing Workflows Reduce Disputes

When identity verification and signing are performed by the same certified provider in a single session, three things change. First, the audit trail is atomic: one record, one provider, one conformity assessment covers the entire event.

Second, the evidence is contemporaneous. The liveness check, the document scan and the signature happen within the same session. There is no gap an adversary can exploit between an old identity check and a current signing event.

Third, liability is clear. Under eIDAS, the QTSP is liable for the accuracy of information in a qualified certificate. ZealiD, as a QTSP listed on the EU Trusted List under Sweden, takes full liability for identity verification and certificate issuance.

What the EUDI Wallet Changes for Signing Portal Authentication

The European Digital Identity Wallet, required by Regulation (EU) 2024/1183, will give every EU citizen a mobile app capable of storing identity credentials and creating qualified electronic signatures. Once available, the wallet becomes another accepted method for identity verification under Article 24.

For signing portals, this raises a practical question. Will the portal integrate directly with the wallet, or continue to rely on a separate identity provider? If the portal treats the wallet as just another factor without binding the wallet's identity assertion to the signing event at the cryptographic level, the same inconsistency problem persists.

ZealiD's position on the wallet is straightforward. The wallet is a container. A certified provider still does the cryptography. It becomes a new front door, not a replacement for the trust service behind it.

In Conclusion: Closing Identity Gaps Requires Structural Change

The gap between identity verification and enterprise signing portals is not a configuration problem you can patch. It is an architectural one. Buying a signing tool and a separate ID verification service and hoping the logs will align when challenged is a strategy that works until it does not.

Closing the gap means choosing a provider where identity proofing and certificate issuance are the same certified service. That is what ZealiD does: one registration, one identity-bound signing workflow, one audit trail that answers the question a regulator will actually ask.

FAQs About Identity Verification in Signing Portals

Why do signing portals have identity check gaps?

Signing portals and identity verification services are usually procured separately, run by different teams and governed by different policies. Because neither system references the other's evidence, the audit trails do not connect. A regulator or court must reconcile two independent records manually.

What is a qualified electronic signature under eIDAS?

A qualified electronic signature is an advanced electronic signature created by a qualified signature creation device and based on a qualified certificate issued by a QTSP. Under eIDAS, it carries the same legal effect as a handwritten signature across all EU member states. ZealiD issues qualified certificates after certified identity proofing, binding the signer's verified identity to the signature.

How does ZealiD prevent authentication inconsistency?

ZealiD performs identity verification and certificate issuance as a single certified service. The signer completes a liveness selfie and document scan during registration. Every subsequent signing event is bound to that verified identity through biometric authentication, so there is no gap between the identity check and the signature.

Does the EUDI Wallet eliminate the need for a trust service provider?

No. The EUDI Wallet is a container for identity credentials and a new way to initiate signing. The cryptographic operations behind a qualified signature still require a certified QTSP. ZealiD treats the wallet as a new front door to its existing trust service, not a replacement for it.

What happens if you cannot prove who signed a document?

The document's legal weight drops. In a dispute, a court may treat the signature as unreliable. Under AMLR obligations, a regulated entity may face enforcement action for failing to demonstrate it knew who it was dealing with. ZealiD's atomic audit trail links the signer's verified identity to the signing event in a single record.