Electronic signature: traceability and internal audit in 2026

The multiplication of dematerialised document flows exposes companies to an often underestimated risk: the inability to reconstruct, in case of dispute 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 by the eIDAS framework, their use in a robust internal audit system, best practices for retaining event logs and selection criteria for a compliant solution.

What is traceability in electronic signature?

Components of a complete audit trail

An audit trail (or audit trail) associated with an electronically signed document is far more than a simple timestamp. It encompasses all documented events from document issuance to signature archiving, including each consultation, rejection, delegation or intermediate validation. In practice, 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 Trusted Services Provider (TSP), it anchors each action in time incontestably according to ETSI EN 319 421 standard.

• Document integrity: cryptographic hash (SHA-256 or SHA-3) calculated before and after each interaction, allowing 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. For more information on the legal foundations of these mechanisms, consult our complete guide to electronic signature.

Signature levels and associated traceability level

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

| Level | Minimum traceability required | Evidential value | |---|---|---| | Simple (SES) | Timestamp, IP, email | Simple presumption | | Advanced (AdES) | Strong authentication, certificate, complete audit trail | Strong (burden of proof reversal difficult) | | Qualified (QES) | Qualified certificate QSCD + qualified TSA | Equivalent to handwritten signature |

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 function

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 agreements (NDA). For each flow, it is necessary to define:

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

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

• Duration of log retention, in line with applicable limitation periods (5 years for commercial matters, 10 years for notarial deeds).

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

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

Using event logs in internal audit assignments

During an internal audit assignment, the event logs generated by the electronic signature platform allow you to:

• Verify compliance with delegations of authority: who signed what, with what level of authorisation, on what date?

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

• Corroborate statements: in case of a signatory contesting they have not affixed their signature, the audit log provides contradictory technical proof.

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

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

Automating audit reporting through APIs

Modern electronic signature platforms expose REST APIs that allow you to automatically extract traceability data and inject it into your company's GRC (Governance, Risk & Compliance) tools (ServiceNow, SAP GRC, IBM OpenPages, etc.). This automation significantly reduces the audit teams' workload and eliminates the risk of human error when manually consolidating evidence. Certyneo's electronic signature ROI calculator illustrates the measurable productivity gains linked to this integration.

Retention and archiving of signature evidence

Legal retention periods and limitation

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 10 years from the end of the financial year.

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

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

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

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

Long-term signature formats

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

Maturity indicators for traceability: assessing your posture

The five-level maturity model

To help audit and compliance directors position their organisation, it is useful to use 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: SaaS solution compliant with eIDAS, 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 framework review.

The majority of French SMEs are 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 requirements from their auditors and sectoral regulators.

Criteria for selecting a traceable and auditable solution

When selecting or migrating to a new signature platform, traceability criteria should carry at least as much weight as usability or price. Key questions to ask the provider:

• Is the audit log immutable (protected against alteration by the editor 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 provider itself subject to a SOC 2 Type II audit or certified ISO 27001?

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

Legal framework applicable to electronic signature traceability

Civil code and evidential value

Article 1366 of the French Civil Code establishes the foundational principle: "Electronic writing has the same evidential force as writing on paper, provided that the person from whom it emanates can be duly identified and that it is established and retained in conditions of a nature 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 is attached." These two articles make traceability and integrity legal conditions sine qua non 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 handwritten 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, identities of signatories, behavioural metadata). They thus constitute a personal data processing activity 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 evidential purpose.

• Retention period: limited to applicable limitation periods, with automatic purge at expiry.

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

• Transfers outside 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 the technical requirements of long-term signature formats. The French standard NF Z 42-013 governs systems of electronic archiving with probative value (SAEVP). Any organisation wishing its audit logs to constitute irrefutable evidence in the long term must ensure that its provider or internal SAE complies with these 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 operators of essential services and important entities obligations regarding risk management and incident notification that explicitly include trust infrastructures used for electronic signature. A failure of a TSP's traceability system may constitute an incident reportable to ANSSI within 24 hours.

Use scenarios: traceability in action

Scenario 1 — A medium-sized industrial group and its 1,200 annual supplier contracts

A mid-sized industrial group of approximately 3,500 employees, spread across six sites in France and two in Central Europe, manages more than 1,200 supplier contracts annually (framework orders, confidentiality agreements, price amendments). Before implementing an electronic signature solution with integrated audit trail, its procurement department retained signed contracts in a shared network directory, without versioning or event log. During an external audit commissioned by an institutional shareholder, the auditor was unable to reconstruct the validation history of 23% of the contracts examined: impossible to prove that the signatory had the required delegation of authority 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 audit trail PDF report with one click. At the next audit (18 months later), the rate of reconstruction of validation chains reached 100%, and the time spent by the audit team collecting documentary evidence decreased by 65%.

Scenario 2 — A management consulting firm (40 consultants) subject to GDPR requirements from its clients

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

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

Scenario 3 — A hospital group of approximately 1,100 beds facing Court of Accounts inspections

A public hospital group managing several facilities must face regular inspections by the regional court of accounts on its public procurement and cooperation agreements. Electronically signed contracts must be producible with their complete audit trail within very short timeframes (48 to 72 hours if summoned).

The facility implemented an electronic 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 deposited in the SAE with its associated event log. During an inspection covering 340 public procurement contracts signed over three financial years, all supporting documents could be produced in less than 4 hours, compared to two weeks at the previous inspection. The reporting magistrate expressly noted the quality of the traceability system in their synthesis report.

Conclusion

Complete traceability of an electronic signature is no longer an option reserved for large organisations: it is a legal imperative, an internal audit tool in its own right and a factor of differentiation in tenders 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 incontestable evidence, exploitable immediately in any inspection or dispute.

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