digital signature - Does anyone know a free(trial) timestamp server service?

Question

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Answer 1

You can try one of these publicly accessible RFC 3161 compliant time-stamping services:

1. https://freetsa.org
   Supports HTTP, HTTPS and TCP transports and has other features
2. http://time.certum.pl
3. http://dse200.ncipher.com/TSS/HttpTspServer
4. http://tsa.safecreative.org 5 free requests per day (may not be valid as root CA is 'test') - Safe Creative TSA is no longer active
5. http://zeitstempel.dfn.de
6. http://tsa.tecxoft.com
   Requires registration
7. http://timestamp.comodoca.com/rfc3161
8. http://sha256timestamp.ws.symantec.com/sha256/timestamp
9. https://timestamp.geotrust.com/tsa
10. http://timestamp.globalsign.com/scripts/timstamp.dll
11. https://ca.signfiles.com/tsa/get.aspx
12. http://services.globaltrustfinder.com/adss/tsa
13. https://tsp.iaik.tugraz.at/tsp/TspRequest

You can also try one of these publicly accessible RFC 3161 compliant client applications:

1. TimeStampClient

Feel free to edit the answer and extend the list.