The Timestamping Authority solution responds to timestamp requests to prove that a digital document, message, or transaction:

• Existed at a certain point in time.
• Has not been altered since.

To respond these requests:

• Multiple clients send requests to the timestamping service of Timestamping Authority.
• One or several Hardware Security Modules (HSMs) manage the timestamp signing key.
• One or several Network Time Protocol (NTP) servers provide an accurate and reliable time source.