How about contact lenses similar to those like for halloween but just don't look creepy? I'm pretty sure you can already buy those and they should generate diff

How about contact lenses similar to those like for halloween but just don't look creepy? I'm pretty sure you can already buy those and they should generate different hash. Face probably can also modify with makeup/mask/beard etc - after all face recognition is not perfect on iPhone any many times cannot automatically detect faces.