AirDrop has to send out a hash of you so that way the surrounding devices that are set to "contacts only" can use it to determine if you're in their contacts li

AirDrop has to send out a hash of you so that way the surrounding devices that are set to "contacts only" can use it to determine if you're in their contacts list (and therefore that it should respond). I'm not sure why WiFi has to send a hash of your phone number, I thought it just prompted nearby devices to ask if they wanted to share it. Maybe there is some functionality there relating to determining if the sender is in your address book, I'm not sure.