Patent ID: 11965971
Assignee: HOPTROFF LONDON LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A system for generating a trusted timestamp comprising:
a network of two or more nodes, wherein at least a time serving node is at a trusted time source and an edge node is at a local time source and the two or more nodes are configured to:
(a) receive, at the edge node, a first time signal from the trusted time source at a first time;
(b) transmit, by the edge node, a message back to the trusted time source at a second time, wherein the message comprises the first time and the second time;
(c) determine a transmission latency between the trusted time source and the edge device based at least in part on the first time signal, the first time, the second time, and a third time at which the message is received by the trusted time source;
(d) calculate a clock offset between the trusted time source and the local time source at the first time, wherein the clock offset is calculated based on the transmission latency determined in (c), the second time and the third time;
(e) receive, at the edge node, the clock offset calculated in (d) and the transmission latency determined in (c) along with a hash code; and
(f) generate, by the local time source at the edge node, a trusted timestamp for an event occurred at a fourth time, wherein the trusted timestamp is generated based at least in part on the clock offset and the fourth time.