What a nice idea to siphon out half bitcoin from other's pocket!!
I seriously doubt your intention. Why don't you be upfront and post your pictures or video clips so that people get to know you beforehand? Because 0.5 bitcoin is a huge amount.
It will help the community to verify the legitimacy of your claim!
That's not necessary at all. The community doesn't have to verify anything. The pictures, videos and calls will only be seen by the escrower and the bettor.
The other bettor will also put 0.5 BTC in escrow with me.
This is the best part , would be the easiest 0.5 btc you ever made OP , you wouldn't even have to lose weight for that .
But even if you'd be legit , 0.5 btc would be a pretty nice incentive to lose weight don't ya think ?
I'm sorry if I wasn't clear. The 0.5 BTC from each bettor (myself included) would be escrowed with a trusted member of the forum.