Electronic Signature: Traceability and Internal Audit in 2026

The proliferation of dematerialised document flows exposes businesses to a often underestimated risk: the inability to reconstruct, in the event of litigation or inspection, the complete chain of events surrounding the signing of a deed. Yet complete traceability of an electronic signature is not merely a technical convenience — it is a legal requirement, a lever for internal audit and a decisive argument before civil and commercial courts. This article explores the traceability mechanisms provided for by the eIDAS framework, their exploitation within a robust internal audit framework, best practices for preserving event logs and selection criteria for a compliant solution.

What is Traceability in Electronic Signature?

Components of a Complete Audit Trail

An audit trail associated with an electronically signed document is far more than a simple timestamp. It comprises all documented events from document issuance through to signature archiving, including each consultation, refusal, delegation or intermediate validation. Concretely, a reliable event log captures:

• Verified identity of the signatory: authentication method used (SMS OTP, qualified certificate, eIDAS digital identity), IP address, device fingerprint.

• Qualified timestamp: provided by an accredited Trust Service Provider (TSP), it anchors each action in time in an indisputable manner according to ETSI EN 319 421 standard.

• Document integrity: cryptographic hash (SHA-256 or SHA-3) calculated before and after each interaction, enabling detection of any alteration.

• Contextual metadata: browser, language, screen resolution, optional geolocation with GDPR consent, time zone.

This granularity is essential for the log to constitute admissible evidence before French and European courts. To learn more about the legal foundations of these mechanisms, consult our comprehensive guide to electronic signature.

Signature Levels and Associated Traceability Level

The eIDAS regulation distinguishes three signature levels — simple (SES), advanced (AdES) and qualified (QES) — and each implies a different degree of traceability:

The choice of level should be guided by risk analysis specific to each document flow. Our comparison of electronic signature solutions helps you identify the solution suited to your context.

Integrating Traceability into the Internal Audit Framework

Mapping Critical Document Flows

Before deploying a signature solution, the internal audit team must map all sensitive document flows: commercial contracts, HR amendments, board minutes, transfer orders, confidentiality commitments (NDAs). For each flow, it is appropriate to define:

• The required signature level according to the legal value and associated financial risk.

• The actors involved and their roles (initiator, validator, signatory, archivist).

• The retention period for logs, in line with applicable prescription deadlines (5 years for commercial matters, 10 years for authenticated deeds).

• Conditions of access to audit logs, ensuring separation of duties.

This mapping forms the basis of the internal control framework relating to electronic signature. It naturally fits within a broader approach to governance of electronic signature in the enterprise.

Exploiting Event Logs in Audit Assignments

During an internal audit assignment, event logs generated by the electronic signature platform enable:

• Verification of compliance with delegation of powers: who signed what, with what level of authorisation, on what date?

• Detection of temporal anomalies: a contract signed outside business hours, from an unusual location or within an abnormally short timeframe may reveal internal fraud.

• Corroboration of statements: in the event of a signatory contesting having affixed their signature, the audit log provides contradictory technical proof.

• Feeding compliance reporting: GDPR (processing register), ISO 27001 (access traceability), sectoral directives (PSD2, insurance sector, healthcare).

A point of vigilance: event logs must themselves be integral and unalterable. A good practice is to timestamp them regularly and store them in a separate digital safe from the production system, ideally via electronic archiving with probative value (AEVP) compliant with NF Z 42-013 standard.

Automating Audit Reporting via APIs

Modern electronic signature platforms expose REST APIs that allow automatic extraction of traceability data and injection into the organisation's GRC (Governance, Risk & Compliance) tools (ServiceNow, SAP GRC, IBM OpenPages, etc.). This automation significantly reduces the burden on internal auditors and eliminates the risk of human error when consolidating evidence manually. The electronic signature ROI calculator from Certyneo illustrates the measurable productivity gains linked to this integration.

Retention and Archiving of Signature Evidence

Legal Retention Periods and Prescription

Retention of signature evidence is subject to several overlapping legal regimes:

• Commercial law (art. L. 123-22 French Commercial Code): accounting documents and supporting documents must be retained for 10 years from the end of the financial year.

• General prescription (art. 2224 French Civil Code): 5 years for personal or moveable actions, starting from the day the holder knew or should have known the facts.

• Labour law: payslips must be retained for 50 years or until the employee reaches 75 years of age.

• Health data: 20 years from the last visit (art. R. 1112-7 French Public Health Code).

These periods require that the archiving solution guarantees readability of formats over the long term (PDF/A-3, XAdES-LTA for XML signatures) and accessibility of decryption keys.

Long-Lived Signature Formats

The XAdES-LT and XAdES-LTA profiles (Long Term Archival), defined by ETSI EN 319 132 standard, embed within the signed file all information necessary for deferred validation: complete certification chain, OCSP responses or CRL, archive timestamp. This documentary self-sufficiency is critical because Certification Authority certificates have limited lifespans (1 to 3 years) and PKI infrastructures evolve. Without this mechanism, a signature valid today could become technically unverifiable in five years, irreparably compromising its probative value.

Traceability Maturity Indicators: Assessing Your Posture

The Five-Level Maturity Model

To help audit and compliance directors situate their organisation, it is useful to employ a graduated maturity model:

• Level 1 — Non-existent: email signatures without formalised audit trail.

• Level 2 — Elementary: basic timestamp, no certificate, unstructured logs.

• Level 3 — Defined: eIDAS-compliant SaaS solution, exportable logs, 5-year retention.

• Level 4 — Managed: GRC integration, automatic alerts on anomalies, AEVP compliant with NF Z 42-013.

• Level 5 — Optimised: real-time audit trail, AI anomaly detection, automated GDPR reporting, annual reference framework review.

The majority of French SMEs fall between levels 2 and 3 according to Adobe's State of Digital Trust report (2025). Large CAC 40 companies tend towards level 4, driven by the requirements of their statutory auditors and sectoral regulators.

Selection Criteria for a Traceable and Auditable Solution

When selecting or migrating to a new signature platform, traceability criteria must weigh at least as heavily as ergonomics or price. Key questions to ask the service provider:

• Is the audit log immutable (protection against alteration by the publisher itself)?

• Is the timestamp provided by a qualified TSA registered on the eIDAS Trust List?

• Is traceability data hosted in Europe (sovereignty, GDPR)?

• Are logs exportable in open formats (JSON, XML, CSV) without proprietary dependency?

• Is there an audit API enabling integration with existing GRC tools?

• Is the service provider itself subject to a SOC 2 Type II audit or ISO 27001 certified?

If you are considering changing solutions, our migration guide from DocuSign or YouSign to Certyneo details the steps to preserve continuity of existing audit trails without documentary discontinuity.

Legal Framework Applicable to Traceability of Electronic Signatures

Civil Code and Probative Value

Article 1366 of the French Civil Code establishes the founding principle: "Electronic writing has the same probative force as writing on paper support, provided that the person from whom it emanates can be duly identified and that it is established and maintained under conditions such as to guarantee its integrity." Article 1367 clarifies that electronic signature "consists in the use of a reliable identification procedure guaranteeing its link with the deed to which it attaches". These two articles make traceability and integrity essential legal conditions for the admissibility of electronic evidence.

eIDAS Regulation No. 910/2014 and eIDAS 2.0

The European regulation eIDAS No. 910/2014 establishes the legal framework for electronic signatures in the European Union. Its article 25 provides that a qualified electronic signature (QES) has a legal effect equivalent to a manuscript signature in all Member States. Articles 26 (advanced signature) and 27 (cross-border recognition) impose precise technical requirements on authentication and integrity that translate directly into traceability obligations. eIDAS 2.0 regulation (EU Regulation 2024/1183, which entered into force on 20 May 2024) strengthens these requirements by integrating the European digital identity wallet (EUDIW) and extending obligations to Qualified Trust Service Providers.

GDPR No. 2016/679 and Traceability Data

Audit logs contain personal data (IP addresses, signatory identities, behavioural metadata). They therefore constitute a processing of personal data subject to GDPR. Main obligations:

• Legal basis: legitimate interest (art. 6.1.f) or legal obligation (art. 6.1.c), to be documented in the processing register.

• Minimisation: collect only data strictly necessary for the probative purpose.

• Retention period: limited to applicable prescription deadlines, with automatic deletion at expiry.

• Security: encryption of logs at rest and in transit, strict access control (art. 32).

• Transfers outside the EU: prohibited without adequate safeguards (standard contractual clauses, adequacy decision).

ETSI Standards and Archiving with Probative Value

The standards ETSI EN 319 132 (XAdES), ETSI EN 319 122 (CAdES) and ETSI EN 319 102 (generation and validation procedures) define technical requirements for long-lived signature formats. The French standard NF Z 42-013 governs systems for electronic archiving with probative value (SAEVP). Any organisation wishing its audit logs to constitute irrefutable evidence over the long term must ensure that its service provider or internal SAE is compliant with these reference frameworks.

NIS 2 and Resilience of Trust Infrastructures

The NIS 2 directive (transposed into French law by law No. 2024-659 of 9 July 2024) imposes on essential service operators and important entities obligations of risk management and incident notification that explicitly include trust infrastructures used for electronic signature. A failure in the traceability system of a TSP may constitute a notifiable incident to ANSSI within 24 hours.

Use Scenarios: Traceability in Action

Scenario 1 — A Mid-Sized Industrial Group and Its 1,200 Annual Supplier Contracts

An industrial group of around 3,500 employees, spread across six sites in France and two in Central Europe, manages more than 1,200 supplier contracts each year (framework orders, confidentiality agreements, price amendments). Before implementing an electronic signature solution with integrated audit trail, its procurement department stored signed contracts in a shared network folder, without versioning or event log. During an external audit commissioned by an institutional shareholder, the auditor could not reconstruct the validation history for 23% of the examined contracts: impossible to prove that the signatory had the required delegation of powers at the time of signature.

After deploying an advanced signature platform (AdES) with immutable audit logs timestamped by a qualified TSA, the group now has, for each contract, a downloadable PDF audit trail report at the click of a button. At the following audit (18 months later), the rate of reconstruction of validation chains had risen to 100%, and the time spent by the audit team collecting documentary evidence had decreased by 65%.

Scenario 2 — A Management Consulting Firm (40 Consultants) Subject to GDPR Requirements of Its Clients

A management consulting firm assisting financial departments of large companies is regularly audited by the legal departments of its clients, who require proof that engagement letters and confidentiality agreements were properly signed by authorised persons, within contractual deadlines. The firm previously used simple email signature (screenshot + PDF), without solid probative value.

By migrating to a qualified electronic signature solution (QES) for the most sensitive documents and advanced signature (AdES) for operational commitments, the firm can now provide its clients with a standardised evidence package: signature certificate, audit trail report, qualified timestamp and authentication metadata. This package enabled the firm to win two tenders for which documentary traceability was an explicit elimination criterion, representing additional revenue estimated at €180,000 in the first year.

Scenario 3 — A Hospital Group of Around 1,100 Beds Facing Audit Court Controls

A public hospital group managing multiple establishments must face regular audits by the regional audit chamber on its public contracts and cooperation agreements. Electronically signed contract documents must be producible with their complete audit trail within very short timeframes (48 to 72 hours in the event of a summons).

The establishment has implemented an archiving architecture with probative value (AEVP) compliant with NF Z 42-013 standard, connected via API to its signature platform. Each signed document is automatically entered into the SAE with its associated event log. During an audit covering 340 public contracts signed over three financial years, all supporting documents were able to be produced in less than 4 hours, compared with two weeks at the previous audit. The reporting magistrate expressly noted the quality of the traceability framework in the summary report.

Frequently Asked Questions

What is the legal retention period for electronic signature audit logs?

Under French law, the retention period depends on the nature of the deed. For commercial contracts, the limitation period is five years from the date of conclusion of the contract (article L. 110-4 of the French Commercial Code). For certain deeds involving civil liability or long-term commitments, this period can extend to ten years. It is recommended to retain audit logs for at least as long as the deed to which they relate.

Is a simple electronic signature sufficient to be defensible before a French court?

A simple electronic signature (SES) benefits from a presumption of validity, but it can be more easily contested because its level of traceability is minimal: IP address, timestamp and email address. In the event of a dispute, it is for the party relying on it to demonstrate its reliability. For deeds with significant financial or legal implications, an advanced or qualified signature offers considerably stronger probative value before civil and commercial courts.

How can the integrity of event logs be guaranteed so that they are admissible as evidence?

An event log is admissible as evidence only if its integrity can be demonstrated. The recognised practice is to periodically timestamp the logs via an accredited trusted service provider, then store them in an electronic archiving system with probative value (AEVP) compliant with NF Z 42-013 standard, separate from the production system. This physical and logical separation prevents any subsequent alteration and strengthens the probative force of the elements produced.

What personal data does an audit trail contain and how should it be governed under the GDPR?

An audit trail may contain personal data: IP address, device fingerprint, geolocation, login identifiers. These processing activities must be recorded in the organisation's processing activities register. The legal basis is generally legitimate interest or contract performance. Precise geolocation requires explicit consent. Retention periods must be proportionate to the purpose and documented in the organisation's privacy policy.

Can an internal auditor use signature logs to detect internal fraud?

Yes, event logs are an effective fraud detection tool. They enable cross-referencing of the signer's identity with their formal delegation of authority, identifying signatures carried out outside usual time periods, from unusual locations or in abnormally short timeframes. These behavioural indicators, cross-referenced with other internal data sources, can reveal identity theft, procedural misuse or document fraud.

Conclusion

Complete traceability of an electronic signature is no longer an option reserved for large organisations: it is a legal imperative, a tool for internal audit in its own right and a differentiating factor in calls for tender and due diligence. By combining signature formats compliant with ETSI standards, qualified timestamping, archiving with probative value and API integration with your GRC tools, you transform each signature into indisputable evidence, exploitable immediately during any inspection or dispute.

Certyneo was designed from its inception to meet these requirements: immutable audit logs, qualified European TSA, sovereign hosting and documented integration API. Whether you are starting your dematerialisation journey or seeking to strengthen the maturity of your existing framework, our teams are available to support you. Request a personalised demonstration at certyneo.com/contact and discover how to structure your documentary traceability today.