Time verification

Time Stamp is an electronic receipt that certifies the content of an electronic document at a given time. Receipts can be used for reporting work performed, as a proof of authorship to a particular date, etc.

B-Trust issues Time Stamp certificates and verifies Time Stamp certificates online.


B-Trust TimeStamp client with graphical interface – Download (zip).

Instructions for using B-Trust TimeStamp client (in Bulgarian) – Download (pdf).


Put a Time Stamp on your document

Choose a Time Stamp file-request(*.tsq)

(file not selected)

Check the validity of the a Time Stamp

  • By serial number
  • Choose a file-response (*.tsr)
Enter a number from Time Stamp Response in hex or decimal format (You can find the number in the receipt for validation of an electronically signed document.)

Choose a Time Stamp file-response (*.tsr)

0700 199 10