Server seed hash
The casino commits to a hidden server seed before the result, usually by showing a hash.
Evergreen guide
Provably fair games explained.
Provably fair systems let players verify that a crypto-original result matched a seed formula. That helps with result integrity, but it does not make a game profitable or remove platform risk.
Reader takeaway
A visible seed verifier is useful, but the review still needs house edge, payout table, max win, KYC, withdrawal and responsible-gambling checks.
Client seed
The player or browser contributes a seed so the casino is not the only input.
Nonce or round number
Each bet increments a nonce so repeated bets produce separate results.
Reveal and verify
After play, the server seed can be revealed and the result can be recalculated.
What to verify before play
The formula is visible
The casino should explain how seed, client seed, nonce and result calculation connect.
The round can be replayed
After the server seed reveal, the user should be able to recalculate the result or use a verifier.
The edge is still disclosed
Fair result generation does not remove house edge, volatility, max win or payout-table risk.
What it does not prove
- !Provably fair can show whether a result matched the seed formula; it does not prove the casino will pay quickly.
- !It does not replace license, KYC, withdrawal, bonus or restricted-country checks.
- !Provider slots and live dealer tables usually use RNG/certification or table rules rather than crypto seed verification.
- !A player still needs readable payout tables, house edge, max win and responsible-play controls.
Verification flow
A practical seed-check sequence
A good interface makes the verification path understandable before the player loses trust. If the proof is hidden after the result, the fairness claim is weaker for ordinary readers.
Before betting
Look for the server seed hash, the current client seed and whether the client seed can be changed.
During play
Record the bet id, nonce or round number if the interface exposes it. This helps connect the final result to the correct bet.
After reveal
Check whether the server seed can be revealed and whether the casino provides a verifier or enough formula detail to recalculate the outcome.
Across games
Confirm that risk setting, row count, mine count, target odds or other game settings are included in the result calculation.
How proof differs by game
Crash
The proof should connect the seed inputs to the crash point. The review still needs max multiplier, auto-cashout and loss-velocity checks.
Mines
The proof should cover the hidden grid, not just the clicked tile. The payout ladder and mine count still control volatility.
Dice
The proof should connect seed and nonce to the roll number. The house edge and autobet controls remain separate risks.
Plinko
The proof should map to the final bucket or drop path. The bucket probability table is still needed to understand risk.
What a review should not imply
Provably fair does not mean low risk, positive expected value or guaranteed withdrawal. It only addresses whether the disclosed result-generation method matches the recorded inputs.
CryptoBets therefore scores fairness proof alongside RTP/house edge, volatility, max win, KYC, cashier evidence, bonus terms and responsible-gambling controls.
Source notes
Public sources used for this guide
UKGC remote technical standardsUsed for game rules, likelihood-of-winning, software fairness and technical-standard context.GLI-19 interactive gaming systemsUsed for independent testing and RNG/system-control context in online gaming.iTech Labs RNG certificationUsed for context on RNG and game certification by independent testing laboratories.
Fairness review checks
- +The verifier should be reachable from the game or help center, not only from a marketing blog post.
- +The game should explain whether changing the client seed affects future rounds only or the current round too.
- +The proof should cover the settings that matter for the game, such as mine count, target payout, row count or risk level.
- +The review should still record house edge, max win, autoplay controls, speed of play and responsible-gambling tools.