2553 Time Stamp Token Text (Unstructured) Time Stamp Tokens contain a hash of data which is being time stamped, electronically signed by a Timestamping Authority. For example, tst files might be generated to prove a digital signature was created before a given time. The hash refers to data objects carried in ASiC containers. 242 The National Archives of the Czech Republic / The National Archives of the Czech Republic 14 Jun 2022 14 Jun 2022 application/vnd.etsi.timestamp-token MIME fmt/1717 PUID tst File extension