Go to a online casino supporting bitcoin payment, buy some chips and go to a single zero roulette game, bet all on RED: 47.3% chance to double it 
Martingale that shit
Google brings up nothing but gay p0rn.
Maybe try google 'martingale gambling' then instead
.you do this, and you`ll fail even harder.
theres a reason martingale works temporary and shouldnt be used all the time, and it varies on the bankroll.