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FAIRNESS.md

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Fairness

formula

Every game result is calculated using following formula
where privateKey, publicKey and nonce are delivered by game.

function result(privateKey: string, publicKey: string, nonce: string | number) {
    const seed = [privateKey, publicKey, nonce].join('-');

    const subHash = createHmac('sha256', seed).digest('hex').substring(0, 8);

    const spinNumber = parseInt(subHash, 16);

    return spinNumber % range;
}

it is deterministic so result of every game can validated

games

roulette

roulette privateKey and publicKey are generated daily and are publicly available, however privateKey of today seed is hashed (will be revealed next day). nonce is incremental number of roulette rolls. According to this results of rolls are predermined for day and as so can not be manipulated

dice

dice publicKey can be specified by user. Every time this action is done server seed (used as privateKey) is revealed and next one is generated (only hashed one can be seen). For nonce is used incremental number of dice rolls (across all users). Because privateKey and publicKey are created before the game it can not be manipulated.