Addon to Verify Username
I was wondering if anybody could create an addon that checks if a users Minecraft username is legitimate.
I want when users register for my server forums to have to use their same IGN for the forums. To check if the username exists you could use this link
and if it returns false I just want a message to say something like "You must use your Minecraft IGN to sign up". I'm not bothering checking if it's actually them because I have no idea how hard that would be.