The title of Doctor is conferred as of right by the University Paris-Saclay to Doctoral Diploma holders. The degree of Doctor may be conferred only on doctoral candidates duly enrolled during the year of their thesis defence. The doctoral degree may under no circumstances be conferred retroactively.
The diploma is made by imprimerie nationale, based on the data indicated by doctoral candidates in the information system Adum, which compliance will be garantied by the new doctor (signed compliance form)
Meanwhile, the relevant information on doctoral diploma is available on national theses.fr portal in French and in English as well as on the European portal Dart Europe. The link to the metadata of your defense on any of these portals can be used as a digital certificate.