0.3 btc in 15 minutes... That's around $5000...

It shouldn't take more that this to realize it's an absolute scam.
I even saw fake-claim for 3 btc in a day... Reminds me on those African princes offering millions of $$ via email scams... It can be yours within a week just send me $200 to pay some administration tax, blah, blah... pretty please...
Funny how anyone can fall for this.