actauly badspot can trace your ip and see witch key you bought, or something like that
he did it for me :D
That's if you have a static IP..
Anyway, if you remember your ID, I would e-mail Badspot asking which e-mail is associated with that key, and than try to remember my password, after that just use the lost key recovery form.
This is, of course, in-case you don't have a static IP, or did not buy Blockland from your home computer.