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List of free rfc3161 servers.
http://sha256timestamp.ws.symantec.com/sha256/timestamp
http://timestamp.globalsign.com/scripts/timstamp.dll
https://timestamp.geotrust.com/tsa
http://timestamp.verisign.com/scripts/timstamp.dll
http://timestamp.comodoca.com/rfc3161
http://timestamp.wosign.com
http://tsa.startssl.com/rfc3161
http://time.certum.pl
http://timestamp.digicert.com
https://freetsa.org
http://dse200.ncipher.com/TSS/HttpTspServer
http://tsa.safecreative.org
http://zeitstempel.dfn.de
https://ca.signfiles.com/tsa/get.aspx
http://services.globaltrustfinder.com/adss/tsa
https://tsp.iaik.tugraz.at/tsp/TspRequest
http://timestamp.apple.com/ts01
http://timestamp.entrust.net/TSS/RFC3161sha2TS
@trinhpham

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commented Jul 13, 2018

I'm finding a free TSA that optimized for Asia users.
Do you know any?

(All above servers take at least 200ms for a ping response)

PS: The first server I've found is: http://tsa.wotrus.com (~75ms)

@seagate00

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commented Nov 25, 2018

I finded new TSA server. You can use

http://oscp.cocbuilder.su/tsa.php

@haleba-hotmail

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commented Jan 13, 2019

@Manouchehri ,,

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.

@mcarpenterjr

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commented Jan 25, 2019

Excellent resource! Is anyone generating, signing and timestamping PDFs on the fly? Currently working with TCPDF which signs ok but does not have time stamping implemented.

@jonybuzz

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@Manouchehri

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commented Jun 6, 2019

@jonybuzz Thanks, added.

@haleba-hotmail dse200.ncipher.com still resolves fine here. Could you try again?

@Manouchehri

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commented Jun 6, 2019

@seagate00 Getting a connection refused for http://oscp.cocbuilder.su/tsa.php.

@haleba-hotmail

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commented Jun 7, 2019

@Manouchehri

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.

@Silvenga

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commented Jun 13, 2019

Looks like http://timestamp.globalsign.com/scripts/timstamp.dll is now paid product.

GlobalSign's trusted timestamping Software as a Service (SaaS) provides a low cost and easy method

@DarkIrata

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commented Jul 11, 2019

http://tsa.startssl.com/rfc3161
http://tsp.iaik.tugraz.at/tsp/TspRequest
Can be removed from the list. While they get sign successfully, they aren't trusted by windows.

@who

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commented Jul 11, 2019

It appears that http://timestamp.verisign.com/scripts/timstamp.dll no longer functions.

Edit: The downtime of the verisign service was temporary, and it came back online a few hours after going down.

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