Free TSA provided by

https://tsa.safecreative.org/

http://www.itconsult.co.uk/stamper.htm

Free service is limited to 5 timestamps per day and IP

Using commercial service the following commands needs to be used.

https://tsa.safestamper.com/about

openssl ts -query -md5 -digest HASH_MD5 -cert -no_nonce -out tsa_request.tsq

curl -H ‘Content-Type: application/timestamp-query’ –data-binary @tsa_request.tsq https://tsa.safestamper.com/ -o tsa_response.tsr -u user:password