You should check if the site offer you to verify the bets. If there is no option on the site to verify, then there is 80% chance that the site is not Provably Fair. I always try to play on sites which are transparent and offer to verify the games.
This thread will helped a lot of gamblers and if they are promoting their referral links to promote a gambling site this is a big help they can promote how fair the site by letting them check the algo, gamblers are comfortable in playing in a site that is known as fair.
I always feel comfortable in depositing money in the casino which are old ones and trusted. I do try new casino's but mostly play with the free money which they offer. Once I realize that the site is trustable, Provably Fair and no bad feedback reported, only then i deposit my money on those new gambling sites.