It shows on the response, when you send your genuine private key.
Can confirm
Very strange. I sent a test key and didn't get that response but when I sent my real key it did. How did it know the difference between the dummy key and the real key?
probably checking the corresponding public key against known public keys in various places
It doesn’t, only you see that. The owner of the site just sees *****.
You only see hunter2 because I copied and pasted your stars. I just see ****.
He should install Wordpress! It has lots of dumbass counters.