> However at that point surely you just add a salt? How would that work? You'd have to use the same salt for every IP (which completely negates any benefit of

> However at that point surely you just add a salt? How would that work? You'd have to use the same salt for every IP (which completely negates any benefit of the salt), otherwise how do you know that bcrypt(salt_1, IP_1), which you stored in your database yesterday, refers to the same IP as bcrypt(salt_2, IP_1) that you stored a month ago?