Ah, thats from runevision. I recently whatched his youtube video on this (https://youtu.be/HPqGaIMVuLs) and "Return of the Obra Dinn" was also the first thing I thought of.
So while I find that idea interesting, I would rather prefer knocking or texting on the doorstep of peoples homes.
I might have a situation where the QR Code makes sense though. I'm renting a location for a party at the top of a building, which is only accessible by transponder cards. So there is no door bell or anything. Instead of having someone letting the guests in, this could be an alternative.
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