Fair Enough? Prove It.

“Provably fair” is a promise your casino should be able to explain when a customer challenges a result. The strength of that promise depends on what the customer can actually verify.

The recent investigation into Gamdom’s Crash game illustrates why this deserves attention. On 1 November, ProvablyFair.org reported that results could match the published calculation while the game’s calculated return remained below its advertised 99%. At a 2× cash-out target, the researchers calculated a 98% return. Reproducing an outcome and confirming the advertised odds were two different checks.

Gamdom subsequently said its house edge had been higher than advertised and that it had changed the formula. It also announced balance adjustments for affected auto-cashout bets. That response addresses the reported return discrepancy; the broader lesson for operators is to examine the promise behind a fairness label before customers have to question it.

A result verifier answers an important question: do the disclosed inputs and published calculation reproduce the outcome? Customers need access to the relevant records and a usable way to perform that check. A fairness page that describes the process without supplying what a customer needs leaves the promise difficult to use.

There is also the question of how the inputs were chosen. A system needs safeguards against an operator selecting favourable inputs in advance, as well as changing them afterwards. Depending on the game, that can involve committing to a hidden value before incorporating an independently chosen input. The timing and design matter: a calculation that reproduces correctly does not, by itself, establish that the starting conditions were selected fairly.

The advertised return needs its own examination. Your team should be able to connect the game’s rules and payout calculation to the return you publish, including any options that change it. A verifier can faithfully reproduce a game whose mathematics differ from its description. Those two parts of the product need to agree.

For an operator, the decision is whether the evidence supports the claim you put in front of customers. That means reviewing the live game, the verification process and the public explanation together. Changes to game logic or the way inputs are generated should prompt a review of the associated claims and verification tools.

Tanzanite includes provably fair within its product audits. We can help you examine how the fairness experience and supporting information fit together, and where your offering needs attention.

Talk to Tanzanite about reviewing the evidence behind your casino’s provably fair claims.

Sources:
ProvablyFair.org: Gamdom Crash investigation
Gamdom’s response, reproduced from its public post
Stake: published provably fair implementation
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