I'm pretty sure there's no winning strategy for BlackJack at bitZino. It's a game of skill, but no matter how good you are at it, the house edge is still positive.
Tell that to my balance (: The trick with BlackJack is knowing when to split, when to double, when to take no cards and let the dealer bust, etc. It's less easy to play at bitZino due to it being a one-on-one game with the dealer, but it's still possible. I'm looking forward to them adding more seats to the table so that multiple players can play against the dealer.