Both of our gamemodes are built in a 100% provably fair system, using a 3rd party website: random.org. This 3rd party website serializes every request we make to them, making it impossible to make extra requests to get a favorable outcome, so we only reach out to them once, at the end of the round when no other bets are accepted.

Jackpot:
A server seed is generated at the beginning of each round, we encode it and show it as the hash. As the round ends, the winning module (%) is generated when we reach out to random.org for their own seed, then we combine the two using Chance JS to get the %. No deposits are accepted after we reach out to random.org.

var mod=server_seed+'-'+random_seed;
var chance = new ChanceJS(mod);
var percentage = ((chance.floating({min: 0, max: 100, fixed: 6}))/100);

Coinflip:
A server seed is generated as you attempt to host your lobby, we encode it and it's shown as the hash. When the second person finalizes joining (when they accept the trade offer, not upon initiation), we reach out to random.org to get a seed from them, then we combine the two using Chance JS to get the %. Basically we onyl reach out to random.org once the second person cannot back out of the lobby anymore. The timestamps random.org puts on our requests proves that.

var mod=server_seed+'-'+random_seed;
var chance = new ChanceJS(mod);
var percentage = ((chance.floating({min: 0, max: 100, fixed: 6}))/100);

Roulette:
A server seed is generated before we allow bets to start, and then we reach out to random.org after we stop accepting anymore bets and if there are any bets in the round for their own seed before combining the two to roll a winning number. We do not reach out to random.org if no users are in the roulette to cut down on needless API expenses. Here's the algorythm we use after:

var final_hash=server_seed+'@'+random_seed;
var roll = hexdec(final_hash.substr(0, 8)) % 15;

var rollColor='';
if(roll == 0) {
var rollColor = 'green';
} else if(roll >= 1 && roll <=7) {
var rollColor = 'red';
} else if(roll >= 8 && roll <=14) {
var rollColor = 'black';
}