What is that all about? The site makes a claim of making a search through 150mio records a big deal. Ok, it is not trivial, but any decent DB with proper indexes would have no trouble doing that. Am I missing something?
Also, they want me to enter my e/mail to check... <lost me here already>. Seriously?
A form to enter the sha1 of your email address so they can check against a list of addresses they've already sha1ed? And a form that takes the email for people that don't give a shit or don't know wtf a sha is.
Maybe just a .txt of the hashes too, but then no ones coming to your web service I guess.
But if they don't have your address, ie it wasn't leaked or they're full of shit and never had the list, when you enter the SHA1 you don't give them the address.
While you should not take my word for it, I am friends with the owner of that site and it is perfectly safe to put your address into there. The author and I were sharing data.
Also, they want me to enter my e/mail to check... <lost me here already>. Seriously?