Trusted timestamping
（重定向自Trusted timestamp）
![Getting a timestamp from a trusted third party](/Images/godic/202502/18/Trusted_timestamping.svg4922.png")
![Checking correctness of a timestamp generated by a time stamping authority (TSA)](/Images/godic/202502/18/Checking_timestamp.svg4922.png")
Trusted timestamping is the process of securely keeping track of the creation and modification time of a document. Security here means that no one – not even the owner of the document – should be able to change it once it has been recorded provided that the timestamper's integrity is never compromised.