Brief introduction

timeMarker.org is a "timestamping service" using "OpenPGP Message Format".

"Timestamping service" is analogous to a notary public. Client provides data to the service, service marks it with actual timestamp, and signs with a digital signature.

Client data + actual time + digsig = timestamp

Timestamp is a digitally signed certificate of an actual time value and a client's data. Such certificate provides a way to verify existence of a given data at a witnessed time.