Stamper will timestamp a content sent via HTTPS as follows. The content must be submitted using the POST method to https://timestamp.stampertest.itconsult.co.uk/stamp-pgp, for example to timestamp a local file "file01.txt":-
[top be updated once upgrades have gone live] $ curl -H "Content-Type: text/plain" --data-binary '@file01.txt' https://timestamp.stampertest.itconsult.co.uk/stamp-pgp -----BEGIN PGP SIGNATURE----- Comment: ***TEST*** Stamper id: 3000050 iHUEABYKAB0WIQTDFyuhAs0/qLwsIHGWmaHoMo1lrQUCaOo9pgAKCRCWmaHoMo1l rWf1AQDXjLTYNK/RrCUsgEGJPZjZzuhHTeSs8eZCXRzr9CfnGgEAgZnekfnhPuId 8On6ga4/y80OxKSjWHxGa3a44oCFMQg= =/ahj -----END PGP SIGNATURE-----which then returns the timestamp. Alternatively, the timestamp output can be written directly to a file:-
[top be updated once upgrades have gone live]
$ curl -H "Content-Type: text/plain" --data-binary '@file01.txt' -o file01.asc https://timestamp.stampertest.itconsult.co.uk/stamp-pgp
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 304 0 269 100 35 238 31 0:00:01 0:00:01 --:--:-- 269
$ cat file01.asc
-----BEGIN PGP SIGNATURE-----
Comment: ***TEST*** Stamper id: 3000062
iHUEABYKAB0WIQTDFyuhAs0/qLwsIHGWmaHoMo1lrQUCaO016gAKCRCWmaHoMo1l
rSIAAQDDccsx9nqDqVr+y3eOZpebcf9rDFCsVBgsfVW4CekOgQD+IVgD8wtIDCJd
bIQqfTTOChPwnlPqKAE5eoc2dnqcrgA=
=T1XD
-----END PGP SIGNATURE-----
This can be validated:-
[top be updated once upgrades have gone live] $ gpg --verify file01.asc file01.txt gpg: Signature made Mon 13 Oct 2025 17:24:58 UTC gpg: using EDDSA key C3172BA102CD3FA8BC2C20719699A1E8328D65AD gpg: Good signature from "TEST stamper.itconsult.co.uk - Timestamping Key" [full]