Which casino games are provably fair?

The short answer

At most crypto casinos, only the casino's own "originals" are provably fair. These are simple games designed around the seed scheme. Everything from third-party providers, which is usually most of the lobby, uses other systems.

Casinos differ, so treat the table as a starting point and check each game.

Why originals are verifiable

Originals are built by the casino, or a supplier, specifically on the server seed, client seed and nonce scheme. Their logic is simple enough to publish as a formula: take a float, convert it into a roll, a multiplier, a path or a set of positions. Anyone can recompute the result.

Single-float games

• Dice: one float becomes a roll, commonly from 0.00 to 100.00.
• Limbo: one float becomes a multiplier, with the house edge built into the formula.
• Wheel: one float selects a segment.

Multi-float games

• Plinko: one float per row decides left or right. A 16-row board needs 16 floats, which uses two HMAC rounds.
• Mines: a shuffle of 25 tiles uses a float per step, often 24 floats in total.
• Keno: several floats select the drawn numbers without repeats.
• Card games: each card is a float mapped to a card. Many originals use an "infinite deck", where each card is drawn independently rather than from a finite shoe, which changes the probabilities compared with a physical game.

Shared-result games

• Crash and similar multiplayer games: every player in a round sees the same result, so it cannot depend on each player's own client seed. These games usually use a chain of hashes generated in advance, publishing the final hash before the game starts, and often mix in a public value such as a future blockchain block hash chosen in advance. Each round can be verified against the chain. The method differs from casino to casino.

Why third-party games are not

Slots from established providers run on the provider's servers, with their own RNG, tested by independent labs. The casino does not control the randomness and cannot expose a seed scheme for it. A few providers have built their own verifiable systems, but they are exceptions and do not use the casino's seed pair.

Live dealer games use physical cards and wheels. There is no seed to reveal.

How to tell at any casino

1. Look for a fairness button in the game. Provably fair originals usually have a fairness or seeds icon that opens your current seed pair and nonce.
2. Click a bet in your history. Provably fair bets show the server seed hash, client seed and nonce. Third-party bets show a provider round ID instead.
3. Check the game provider. If the game screen or lobby tile names an external studio, it is almost certainly not provably fair in the casino's sense.
4. Read the fairness page. Good documentation lists each game's formula. Games not listed are not covered.
5. Verify one bet. The surest test is to rotate seeds and reproduce a result, for example with our verifier.

Variations to watch for

• Infinite deck card games. Provably fair blackjack and baccarat usually draw each card independently, not from a fixed shoe, so card counting is meaningless and probabilities differ from a physical game.
• House edge set by the casino. Two casinos can offer the "same" original with different edges. Check the stated house edge.
• Game settings matter. Plinko rows and risk level, the number of mines and the limbo target all change the payout table but not the verification method.
• Formulas change. A casino may update a game's formula. Bets should be verified against the formula in force when they were placed.

Is a provably fair game a better bet?

Not because it is provably fair. Verification proves the result was not altered. Many originals do have low house edges, often around 1%, which is lower than typical slots, but that is a pricing choice. Fast originals also let you place many bets per minute, so total expected loss can grow quickly.

How we audit coverage

In each audit we list every game category, mark which are genuinely provably fair, verify a sample of bets for each, and note whether the casino's marketing matches. A casino that labels its whole site provably fair when most of the lobby is third-party slots loses points on our Fairness score, which carries the most weight in our scoring.

Game-by-game notes

The float counts follow the common scheme. Casinos may use different numbers or methods.

Checklist for any game labelled provably fair

1. Does the game show a server seed hash, client seed and nonce?
2. Can you change the client seed?
3. Is the formula documented?
4. Is the house edge stated?
5. Can you reproduce a bet after rotating?

If the answer to any of these is no, treat the provably fair label with caution.

Keno, wheel and other less common originals

Keno and wheel follow the same principles as the games above, but their formulas vary more between casinos. For keno, check that the method draws numbers without duplicates, usually by shuffling or by removing each drawn number from the remaining pool. For wheel, check that the segment layout for each risk setting is published, since the multipliers are fixed by that layout rather than by the float.

Why the label gets stretched

Provably fair is a strong marketing term in crypto gambling, and some casinos apply it loosely, for example in site-wide banners or footers that sit above a lobby made mostly of third-party slots and live tables. That is not necessarily dishonest in intent, but it is misleading in effect. A useful habit is to treat "provably fair" as a property of individual games, not of a casino. Ask of each game you play: can I see the seeds, and can I reproduce the result? If both answers are yes, the label fits that game. If not, its fairness depends on certification, licensing and the provider's reputation instead.

Sources

• https://pigmo-doc.gitbook.io/pigmo.com/fairness/implementation
• https://docs.rs/crate/fair/latest/source/src/rng.rs
• https://datatracker.ietf.org/doc/html/rfc2104
• https://csrc.nist.gov/pubs/fips/180-4/upd1/final