a blockchain will increase the global electricity consumming!

And 3 or more billion Facebook users, each month, with their
computers and Facebook usage and WhatsApp Twitter etc.
usage and mobile phones etc. will do so too ...

Regards
Stefan

For MoI users who have a German-ID card and are interested in this
topic, I use these two services:

https://cloud.sign-me.de/signature/start
for the qualified digital signature

and
https://www.dgn.de/dgn-zeitstempeldienst/

for the timestamp.

The timestamp service can be set-up in Adobe
Reader DC, with your login-credentials, while
for the qualified digital signature you have to
upload your .pdf to sign-me.

Regards
Stefan

Thank you very much, Stefan for your very valuable tips - I appreciate that !

You're welcome Tom!

Regards
Stefan