It is hard for me to understand how someone so incompetent decided to announce a service with bitcoins. There is no such thing as "authenticated" addresses in bitcoin. I'm not even getting into the service per se, as others have already pointed out the issues with it.

Somehow you think your service is going to do better by rejecting stealing transactions coming from bitcoin-qt and every other wallet where the user actually has complete control all the time over his coins. Instead of accepting this fact, you are insisting that accepting only from coinbase is somehow smarter from your part, it is not and you are an idiot.