Does anyone know a free(trial) timestamp server service? [closed]

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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    5 free requests per day (may not be valid as root CA is ‘test’) – Safe Creative TSA is no longer active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.

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