Has anyone verified the PF system on FBTC by the way? Asking as some sites (cryptoplay and luckybird come to mind) have/had fake systems where the rolls were either verified server-side or just not verified at all. I haven't tested FBTC's though.
i just checked and the rolls are verifiable, they don't fake that.
but the way they implemented the system is in a way that if they wanted to, they can try give users server seeds that can't hit the big prizes, because server seeds are rotated after every roll. (the client seed rn is rotated too if you refresh the page, which is a big no no in any PF system, maybe it's bugged?)
the only way you could make their system 100% fair, is if you change your client seed after they reveal the next roll hashed server seed, which let's be real, 99.99% of users on freebitco.in don't do that.

in a normal provably fair system, the server seed gets committed and is never changed unless the player asks for it to be , which makes me believe they made it this way specifically so they can rig it. and the thing is, you can't prove or disprove they did it.
@LoyceV did some math on the free roll wins that have been shared on the forum before, and the numbers didn't add up:
Math time!
118 rolls (and correcting my mistake from 2018):
1 number pays $200 for every 4 numbers that pay $20 (I'm ignoring all rolls other than the 2 highest winners).
Expected outcome: around 23.6 times $200, and 94.4 times $20.
Reality: 2 times $200, and 116 times $20.
What are the odds of this happening?
My statistical math is rusty so I'm taking shortcuts: let's say it took 59 rolls to hit $200.
Odds of hitting $20 at the first roll: 0.8
Odds of hitting $20 in the first 2 rolls: 0.82=0.64
....
Odds of hitting $20 in the first 58 rolls: 0.858=0.00000239452. That's 0.000239% chance. Note that I ignored the other half of the counted rolls.
So, and correct me if my math is wrong: this doesn't have a 5% chance of happening, it's 20,000 times less! And this is exactly what I meant when I said the bad signs were there, but were massively ignored. The odds of this happening twice in a row are several orders of magnitude lower. Count the rest of the topic, and you'll see this pattern continues.
Thanks for that. This makes a lot of sense. I was still new when I started there long ago and kept running into very rare statistical abnormalities but didn't know nearly as much about this stuff as I do now. For example, at 2x my longest loss streaks there were 49x, 48x, 48x, 47x. The 49x has a 1 in 130 trillion chance on its own. I also had 32 loss streaks twice in one day (1 in 11 billion chance) only about 5k rolls apart, which I found interesting.