Unfortunately, I think the public key from that service is no longer importable
in modern GnuPG.
https://gnupg.org/faq/whats-new-in-2.1.html#nopgp2
Trying to import the public key on this page results in no public key being
imported. Without this the service cannot be used to verify the signature on a
timestamp report (I reported this to them several years ago. No changes were
made). Also, this service is not a very secure source of time. They use their
own clock. They claim some security by using an incrementing counter and
publishing signed snapshots to a usenet group. Bottom line though is this
service is pretty ancient and requires a lot of trust on your part of the
administrator.
http://www.itconsult.co.uk/stamper/stampinf.htm
$ gpg2 --verbose --import stamper.asc
gpg: armor header: Version: 2.6.3i
gpg: Total number processed: 3
gpg: skipped PGP-2 keys: 3
$ gpg2 --version
gpg (GnuPG) 2.1.16
> Bertram Scharpf wrote:
>
> > I want to make evidence that I created a document
> > _before_ a certain point of time.
> >
>
>
> http://www.itconsult.co.uk/stamper.htm
>
>
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