Help with a giveaway?

[danbidz]

Hi, i am soon doing a giveaway for; 1 Million, a tides truck, a suit and some Molotov's. I am doing this by Asking everyone to comment on a video saying Give Money! and then i am going to use a random number generator to pick the comment. So my two questions are:

1. Where would i put this give-away thread?
2. And how would i prove it is the first recording and not rigged? I just know that people will complain that it is...

Thanks for your help.
-DANBIDz