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So how about the prize range for the Silver and Gold Chest? About the Black chest, although you say that average prize is $1,000 but is there any specific number of chance (percentage) of each prize on it and how does it works? Is it truely random and there is like a provably fair system once a player open the chest?
Silver Chest average prize is ~$10, and for Gold Chest ~$100. Magic chest bonus designed to be provably fair, but it requires additional development for UI part, so we decided to not publish fairness details for chests for now, we will add this in future.
We use following function, where x is random number with value greater than or equal to 0 and lest than 1, min is minimum bonus, max is maximum bonus and rate is used to configure allocation (silver: 0.001, gold: 0.0001, black: 0.00001).
double ExponentialInRange(double x, double min, double max, double rate)
{
double era = Math.Exp(-rate * min);
return -Math.Log(era - x * (era - Math.Exp(-rate * max))) / rate;
}