Does the Apple Watch really identify "you"? In several places in the iOS Apple Watch settings app, important functionality depends on "you" wearing the watch. Critically under the settings for unlocking the watch without requiring a passcode (Security > Unlock with iPhone):


  When this is on, unlocking your iPhone will automatically unlock Apple
  Watch — as long as you're wearing it.


Does the Apple Watch really form a signature for recognizing a specific user (analogous to fingerprint recognition), or should the above read "as long as someone is wearing it (in BT range of your iPhone)"?
As far as I can tell its just means as long as it's connected via bluetooth and in range. There isn't a Touch ID scanner on the watch or anything like that so I don't think that it forms an knid of "signature" to you.