Pretend to be your friend? They were just taking your order. Why do you care if they are sitting or standing while they do?

The police shoving the meter right into the speaker shows how whack this is. Measurement of sound varies a ton, and if they just stood back they wouldn’t be “injured” by a 90db speaker

I think you are misunderstanding things or don’t know shit about cryptography. Why the fuck are y even talking about publicly unlockable encryption, this is a use case for verification like a MAC signature, not any kind of encryption.

And no, your process is wild. The actual answer is just replace the sensor input to the same encryption circuits. That is trivial if you own and have control over your own device. For your scheme to work, personal ownership rights would have to be severely hampered.

If you’ve been saying this for a long time please stop. This will solve nothing. It will be trivial to bypass for malicious actors and just hampers normal consumers.