Congrats to you buddy! I have never had any luck with BJ
I wonder if it is possible to use the counting cards techniques they always talk about in movies and all at on-line casinos.
I don't think so. It's basically pointless to try and count cards when you don't know how many decks are being used or how many cards have been played in the shoe. Betchain doesn't indicate a number of decks.
Some casinos do specify how many decks they used such as https://bitcointalk.org/index.php?topic=130242.msg7711847#msg7711847.
Will you be able to beat the house by counting cards in that case?