A story in pics:

Today its the email address, and only the right email address (just like IP addresses before that) - perhaps they change from month to month but end result is same
https://image.nostr.build/f864f87c021807da176e83b6d774b9011acf5b134e7b76eec7cb1360cc38098a.jpg



https://image.nostr.build/0b351fce9692b83165e8260a2881df11e7dedeaa5c876b7c2b1bf81a37820b15.jpg