Q: I want to add timestamps when adding digital signatures to PDF documents in PDF Studio. Do you have a list of timestamp servers available?

A: In PDF Studio version 2020, we switched our algorithm for communication with timestamp servers from SHA1 to SHA512.  This FreeTSA – Guide recommends using SHA-512. SHA-512 is part of SHA-2 (read more on md5hashing.net).

As of August 2020, below is the list of timestamp servers that we found working in PDF Studio 2020:

 

Timestamp Server SHA1
PDF Studio 2019-
SHA512
PDF Studio 2020+
http://timestamp.globalsign.com/scripts/timestamp.dll
http://tsa.starfieldtech.com
http://tsa.safelayer.com:8093/
http://ca.signfiles.com/tsa/get.aspx
http://services.globaltrustfinder.com/adss/tsa
(no longer in service)
https://freetsa.org/tsr
http://tsatest1.digistamp.com/tsa (requires authentication)
http://timestamp.comodoca.com/rfc3161 Not Tested
http://time.certum.pl Not Tested
http://timestamp.digicert.com Not Tested
http://zeitstempel.dfn.de Not Tested (Must increase length to 8000)
http://timestamp.apple.com/ts01 Not Tested
http://timestamp.entrust.net/TSS/RFC3161sha2TS Not Tested
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