METHOD OF EVIDENCING EXISTENCE OF DIGITAL DOCUMENTS AND SYSTEM THEREFOR, AND TAG CHAIN BLOCKCHAIN SYSTEM

摘要

A computer-implemented method for evidencing the existence of a digital document has the steps of obtaining one or a plurality of time stamp (s) of the digital document, obtaining one or a plurality of cryptographic hash (es) of the digital document, generating one or a plurality of evidence key (s) based on the time stamp (s) and the cryptographic hash (es), and storing the evidence key (s) to provide one or a plurality of stored evidence key (s). A computer system for evidencing the existence of a digital document is also provided. A computer-implemented tag chain system is also described.