I also think it is provably fair because I won some time with 0.01btc bet and made it into 0.02btc on one lucky roll.
But I won't test my luck with rolling more than 5 times because one of those rolls can wipe your entire balance on the site so fast. As with any other dice site can do to you as well.
![Embarrassed](https://bitcointalk.org/Smileys/default/embarrassed.gif)
With just one roll you really cannot test how provably fair Yobit system is,but i am pretty sure that it will consume your entire balance if you continue for a longer period of time and i am not even sure whether you could verify your rolls,because i have not rolled in that site with bitcoin ,simply because i do not trust how things work in that site but i did try rolling with a alt but i ended up busting everything and i did not care too long about that,when i checked on verifying my rolls and i could not find that,but i am not sure because i was not serious about the whole process.