Thanks for compiling this list.
My interest is in free general-purpose timestamping service (e.g. stamping pdf, zip files) and this page was near the top of Google's search results, so a good starting point for a comprehensive list of freeTSA servers, but some of the links appear to be dead
dse200.ncipher.com/TSS/HttpTspServer : address could not be found for either the full URL or the base address dse200.ncipher.com.
timestamp.geotrust.com/tsa : has been retired by Symantec and replaced with sha256timestamp.ws.symantec.com/sha256/timestamp (see INFORMATIONAL | Discontinued Use of (Legacy) SHA1 RFC 3161 timestamp service - DigiCert) and appears to be a direct link to their RFC3161 timestamper and not a "landing" page.
Not 100% certain but it looks like the "timestamp.dll" links are direct RFC3161 timestamp server links designed to be used for code-signing only (possibly by Microsoft's SignTool).
For what I came to this page for the best current (1/19/2019) link for genuinely free general-purpose timestamping is freetsa.org. No time to go through all the links, but this of interest so I will update this comment as time allows.
Thanks again for the scholarship compiling this resource.
Double checked and it looks like the ncipher link is purely a timestamping server to be accessed via software like openssl and not a web site based service like freetsa, so simply putting the base address in a browser yields a "no page found" error, but it resolves fine in tracert.
Looks like http://timestamp.globalsign.com/scripts/timstamp.dll is now paid product.
Edit: The downtime of the verisign service was temporary, and it came back online a few hours after going down.
Digicert has announced that the former Verisign and Symantec time stamping services are deprecated; see [https://knowledge.digicert.com/alerts/migration-of-legacy-verisign-and-symantec-time-stamping-services.html] for their announcement. The three services timestamp.verisign.com/scripts/timstamp.dll, sha1timestamp.ws.symantec.com/sha1/timestamp, and sha256timestamp.ws.symantec.com/sha256/timestamp will go offline on or about Oct 31, 2019. They provide timestamp.digicert.com as the recommended replacement.
FreeTSA does not work in Adobe Acroboat. FreeTSA just gives an error message, then Adobe grabs time from the own computer.
For many of the above TSAI get I validation error (in Adobe Acrobat PRO) that
Are there any free/open TSAs that yield verifiable timestamps?
Hi Everyone :) Just giving feedback in the latest list of Timestamping Servers, using Foxit Reader v9.7.2, located here in the Philippines on the PLDT network: