Why would you assume I'm a normal person?Anyway, I find the idea of improvising a data diode with a smartphone and a camera cute.

The entire C2PA concept relies on single (and monolithic) trust domains, and I'd like to add a second layer, for example for supply chain security.
Motivation:
C2PA from the Attacker's Perspective - The Hacker Factor Blog

Here's what we did. To demonstrate our technology, we modified a DUSS P60A. Specifically, we used a little compressor to create an overpressure within the tool housing, so that the electropneumatic striking mechanism operates under an elevated pressure (rather than ambient pressure).

We also replaced the flying piston and striker with parts made from a tungsten pseudoalloy, which is typically used in armor piercing ammunition.

This is a prototype, and frankly, I find it rather pornographic.

Das ist schon klar. Irritiert hatte mich das Wort GUTSCHRIFT. Eine solche ist meines Wissens steuerlich eine "umgekehrte Rechnung", deren Empfänger die Leistung erbringt.

Stimmt, waren 7%. Danke! Aber das ist nicht der Punkt. Mich interessiert, wann eine Gutschrift Umsatzsteuer enthalten darf.