The probative value of an electronic signature depends on the ability to demonstrate to a judge two elements: certain identification of the signatory and document integrity (Article 1366 of the Civil Code).
Certyneo delivers for each signature an audit certificate embedded in the PDF, which collects all technical evidence:
- Signatory identity (email address, phone number verified via dual-channel OTP)
- Qualified timestamp of each action (viewing, signature, refusal)
- SHA-256 cryptographic hash of the document, which demonstrates that it has not been modified since signing
- IP address and approximate geolocation of the signatory at the time of signature
- Detailed log of viewings, reminders, and actions on the envelope
This body of evidence is recognised by French (Cass. civ. 1st, 6 April 2016; Cass. com., 13 March 2019) and European case law. For documents countersigned by a lawyer (electronic legal act), the probative force is further reinforced — the client is relieved of any handwritten notation requirement.