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Didn’t know where in the tread to reply.
This is being worked on from multiple angles.
In the us apple, Google, Microsoft ++ are working on a common framework for this. (Shocking who are working on this in the us)
The EU has a citizens digital wallet program for the same purpose. These programs are also collaborating so that certificates and proof of personhood/citizenship etc can be exchanged between various actors.
The EU model leans heavily into privacy and user control of data, where you as an individual decides with whom to share your credentials, proof of personhood, etc.
This would lead to many possibilities, like for instance being able to confirm digitally prescriptions for medicine across borders, so you can easily get your medication even if you are traveling in another country, without having to spend time and energy getting signed paperwork send back and forth.
The most simple form of this would be that the system simply verifies that yes, you are indeed a human individual. But can be expanded to confirm citizenship, allow you to share your medical data with institutions, confirm diplomas and professional certification etc.
I mean a pianotuneR (as in a guy that tunes your piano) is pretty expensive.
These apps seem to be marketed as tools for professional piano tuners. And looking just at the screenshots it looks like it has a lot of tools and features outside of just showing the correct pitch.
If tuning pianos is your profession, paying 999$ once and writing it off as a business expense isn’t that far fetched.
(Better be a bloody useful tool though ;) )