Because my guess is that location will give you too may false positives if ppl realy use that system. I wonder if it would not be better to do sth like emitting

Because my guess is that location will give you too may false positives if ppl realy use that system. I wonder if it would not be better to do sth like emitting colocation ble beacons with totp sequence and a random secret. If some is tested positive you release the secret or a even only a list of the emitted beacons in the relevant timeframe. Everyone can then check against the list they recorded. Does that make sense?