Patent ID: 11924342
Assignee: 707 LIMITED
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 17:
18. A method for verifying the data integrity of a digital document comprising the steps of:
A. storing a digital document on a user's system;
B. obtaining metadata of the digital document;
C. obtaining a cryptographic hash of the digital document;
D. sending the metadata and the cryptographic hash to a remote device;
E. receiving the metadata and the cryptographic hash at the remote device;
F. requesting a time stamp from a time source;
G. receiving the time stamp at the remote device from the time source, wherein the remote device does not comprise the time source;
H. combining the metadata, the cryptographic hash, and the time stamp at the remote device in an evidence key generator to generate an evidence key;
I. storing the evidence key to provide a stored evidence key;
J. obtaining a second cryptographic hash of the digital document by a third party user;
K. comparing the second cryptographic hash with the cryptographic hash in the stored evidence key to generate a comparison result; and
L. notifying the third party user of the comparison result,
wherein during the method the digital document remains within the user's system, the third party user's system, or both.