MULTI-FACTOR DATA CERTIFICATION

原文（中国語）

A module for processing certifying instances of digital data comprises a public key of the user and of certifying systems, wherein each of the certifying instances is associated with a storage address, with a user terminal, and with a non-repudiable ledger comprising an ordered list of elements. Each of the elements comprises: an attestation generated by one of the certifying systems, an attestation comprising a type of attestation, a document hash, a time stamp by the certifying system of the time at which the attestation was generated; an electronic signature of the attestation; a time stamp by the processing module of the time at which the element was added to the ordered list; and possibly a pointer to the document.