Make a bet on that other site? Set a deadline. The "bet if dooglus is a scammer"... I think it's called bitbet? Which incidentally is one of the adverts on just-dice. http://bitbet.us/

hehehe. That would ... work both ways. You make a bet that he isn't going to disappear with 19k BTC, or you bet that he will disappear with 19k BTC.

It's a gamble either way.