The probative value of an electronic signature depends on the ability to demonstrate two elements before a judge: certain identification of the signer and the integrity of the document (Article 1366 of the French Civil Code).
For each signature, Certyneo issues an audit certificate embedded in the PDF, which gathers every piece of technical evidence:
- Signer identity (email address, phone number verified through dual-channel OTP)
- Qualified timestamp for every action (view, signature, refusal)
- SHA-256 cryptographic fingerprint of the document, which proves it has not been modified since signing
- IP address and approximate geolocation of the signer at the time of signing
- Detailed log of views, reminders and actions on the envelope
This body of evidence is recognised by French case law (Cass. civ. 1re, 6 April 2016; Cass. com., 13 March 2019) and European case law. For deeds benefiting from a lawyer's countersignature (electronic lawyer's deed), the probative force is strengthened further — the client is exempt from any handwritten statement.