There are no actual 100% safe methods to gamble, but you could try martingale. If you have a large enough bankroll, it's almost impossible to lose. Let's say you martingale with 1 bitcoin at a 1 satoshi base bet.
If my maths is correct (I actually have no idea if it's correct or not), you should be able to cover about 20 losses in a row. How could you roll wrongly 20 times in a row!? (It's actually possible, I've lost 15 times in a row before xD)
i would say martingale is one of the 100% unsafest methods in gambling, especially in the bitcoin casinos where the house edge is a thing. take into account that with martingale, most players are going to be putting in thousands, if not tens of thousands, of bets over a long period of time. 1% edge might not seem that important, but mover those thousands of bets, it really makes a difference in the long run. If my maths is correct (I actually have no idea if it's correct or not), you should be able to cover about 20 losses in a row. How could you roll wrongly 20 times in a row!? (It's actually possible, I've lost 15 times in a row before xD)
. THe only safe way to gamble if you are playing in matchsticks or in pieces of cookies with your friends... or if you stay away from gambling at all.