It would be nice if someone would create a device to exchange contact info with businesses to close the loop on managing the whitelist for new, infrequent associations. I should be able to go to a receptionist, mechanic, or contractor and accept identifying info from a Bluetooth device or a standardized non-URL QR code payload to let them contact me in the future. Then we could more conveniently manage authentication ourselves and cut the bad actors out of the process.