eIDAS Trust Services Compared: Electronic Seal vs Signature vs Timestamp (2026)

The Three eIDAS Qualified Trust Services Explained

eIDAS Regulation (EU) No 910/2014 defines a legal framework for electronic identification and trust services across all 27 EU member states. Within that framework, three qualified trust services are directly relevant to document protection and IP ownership: the qualified electronic signature, the qualified electronic seal, and the qualified electronic timestamp.

Choosing the wrong service is not a minor administrative error. A qualified electronic signature issued to a company does not exist under eIDAS — only natural persons can hold one. A timestamp alone does not bind a specific person or organisation to a document. Selecting the wrong trust service means the legal presumption you need may not apply when you need it most: in a dispute, an audit, or a court proceeding.

This guide explains exactly what each qualified trust service does, which article of eIDAS governs it, and when each is appropriate for your business.

1. Qualified Electronic Signature (QES)

Under eIDAS Art. 25 and Art. 28, a qualified electronic signature is a signature issued to a natural person — an individual human being — after verified identity authentication. It is the highest form of electronic signature recognised under EU law.

The legal effect (Art. 25(1) + 25(2)): A qualified electronic signature carries the equivalent legal effect of a handwritten signature (Art. 25(1)) — not merely a presumption, but a direct legal equivalence. Under Art. 25(2), a QES issued in one EU member state is recognised as a qualified electronic signature in all 27 others. Challenging a QES in court requires the opposing party to rebut its authenticity.

Requirements: Issued only by a Qualified Trust Service Provider (QTSP) after in-person or equivalent identity verification of the individual. The signatory must hold a qualified certificate for electronic signatures.

When to use it:

• Signing employment contracts, commercial agreements, or legal filings
• Personal approvals where individual accountability is required
• Any situation requiring the equivalent of a handwritten signature under EU law

Swiss equivalent: ZertES SR 943.03 governs qualified electronic signatures in Switzerland, requiring issuance by a ZertES-accredited certification service provider.

Critical limitation: A qualified electronic signature cannot be issued to a company, organisation, or automated process. For organisations, the correct instrument is the qualified electronic seal.

2. Qualified Electronic Seal (QES for Legal Persons)

Under eIDAS Art. 35 and Art. 36, a qualified electronic seal is the organisational equivalent of a qualified electronic signature. It is issued to a legal entity — a company, government body, or other organisation — rather than to an individual.

The legal presumption (Art. 35(2)): A qualified electronic seal carries the presumption of data integrity and origin. When a document bears a qualified electronic seal, it is presumed to originate from the sealed organisation and to be unaltered since sealing. Courts in all EU member states must apply this presumption.

Requirements: Issued by a QTSP accredited for seal services, using the organisation's company registration credentials. No individual identity verification is required — the legal entity is the seal holder.

When to use it:

• IP protection: Seal creative works, technical specifications, software source code, or design files to establish verifiable ownership and creation date
• Batch document workflows: Automatically seal hundreds of contracts, certificates, or records without individual signature steps
• Automated pipelines: Integrate via API to seal documents at issuance — invoices, certificates, compliance reports
• Audit trails: Create tamper-evident records of document states at specific points in time

Swiss equivalent: ZertES SR 943.03 provides the Swiss framework for electronic seals issued to legal entities by ZertES-accredited providers.

Why this matters for IP: For organisations protecting intellectual property, a qualified electronic seal is often the correct first instrument. It establishes that the sealed document originated from your organisation at the time of sealing — providing evidence of ownership without requiring manual signature steps on every file.

3. Qualified Electronic Timestamp (QET)

Under eIDAS Art. 41 and Art. 42, a qualified electronic timestamp binds a specific point in time to a document's data. It is issued by a QTSP using RFC 3161-compliant protocols and an accurate time source.

The legal presumption (Art. 41(2)): A qualified electronic timestamp carries the presumption of accuracy of the date and time it indicates, and the integrity of the data to which it refers. In practical terms: when you need to prove a document existed in a specific form before a specific date, a qualified timestamp is the legally correct instrument.

Requirements: Any person or legal entity can obtain a qualified timestamp. No identity verification is required. The QTSP must use an accurate time source and RFC 3161 protocol.

When to use it:

• IP ownership disputes: Prove that a design, invention, creative work, or codebase existed before a competitor's filing date
• Copyright evidence: Establish the creation date of written works, music, software, or other copyrightable material
• Court evidence: Submit verifiable, tamper-proof records of document states for litigation
• Audit trails and regulatory compliance: Record when data existed in a specific state for GDPR, financial, or contractual purposes

Swiss equivalent: ZertES SR 943.03 recognises qualified electronic timestamps issued by ZertES-accredited providers as having equivalent legal standing under Swiss law.

QTSP for Switzerland and EU: Swisscom Trust Services holds dual accreditation — accredited under both ZertES (Swiss) and eIDAS (EU) — making timestamps issued via Swisscom Trust Services legally effective in both legal systems simultaneously.

Comparison Table

Which eIDAS Service Does Swiss Trust Layer Provide?

Swiss Trust Layer issues qualified electronic seals (eIDAS Art. 35) and qualified electronic timestamps (eIDAS Art. 41) via Swisscom Trust Services — a QTSP accredited under both EU eIDAS and Swiss ZertES SR 943.03.

This dual accreditation means every sealed document is legally presumed authentic under Swiss law and carries the eIDAS Art. 35 / Art. 41 presumption across all EU member states — without requiring separate filings in each jurisdiction.

What this means for your organisation:

• Upload a document, specify recipients or seal in bulk — sealed documents carry legal presumption immediately
• Combine a qualified seal (origin + integrity) with a qualified timestamp (creation date) in a single operation
• Verify sealed documents at verify.swisstrustlayer.com — no account required, no login, publicly accessible
• Available from CHF 5 per document

For organisations that also require qualified electronic signatures for individual signatories (personal contracts, board resolutions), Swiss Trust Layer integrates with QTSP partners that offer QES issuance directly.

To see the full technical and legal specification, visit the eIDAS compliance overview or the ZertES framework page. For IP-specific workflows, see software IP protection.

Ready to seal your organisation's documents with qualified EU-recognised trust services?

See Pricing — or learn how eIDAS qualified trust works for your specific use case.