Last updated: 7 September 2026
Quick Answer: Provably fair crypto casino games are the ones you can re-run from a published seed, and dice is the easiest of the six to verify. Ranked by how quickly you can check a result: dice, crash, mines, plinko, blackjack, then roulette, all six built in-house at Power.Win. Each shows a SHA-256 hash of the server seed before you bet.
A “provably fair” badge on a lobby does not tell you which games you can actually check. An outside studio’s slot and an operator-built dice game can sit under the same label with completely different proof behind them.
This page ranks the six genuinely provably fair games by how much work a verification takes (workload, not fairness, since all six share one commitment), explains that commitment, and runs a check with real numbers. The edge stays visible either way: a 1.9800× dice payout at a 50.00% win chance is a 1.00% house edge, and a European-style roulette wheel is 2.70% on every bet.
Which casino games are actually provably fair?
At Power.Win, six games are provably fair in the strict sense: the operator built them and publishes the server seed hash, the client seed and the nonce, so you can reproduce any round. They are dice, crash, mines, plinko, blackjack and roulette, the PWR Originals, each on its own /games/ page.
Ranked by how little you have to reproduce to confirm a result:
- Dice. One number on a 0.00 to 99.99 scale against one line you set. The Power.Win dice game lets you pick the odds, so the edge and the proof are on screen before you roll.
- Crash. One multiplier per round, shared by everyone in it. You reproduce a single crash point on the crash game and check your cash-out against it.
- Mines. One arrangement of mines across a grid. On the mines game you reproduce the layout once, which settles every pick in the round.
- Plinko. One path of left-and-right bounces ending in a payout bucket. The plinko game needs a whole path reproduced, not one value.
- Blackjack. A sequence of cards drawn in order, with your decisions layered over it. The blackjack table publishes transparent odds, and you’re checking a whole deal.
- Roulette. One pocket on a European-style wheel, then a table of bet types to resolve. The roulette wheel is verifiable, but a split or column payout takes the most steps.
| Game | What you reproduce | Bets settled per check | Verification workload |
|---|---|---|---|
| Dice | One number | One | Lowest |
| Crash | One multiplier | One round, all bets in it | Low |
| Mines | One grid layout | Every pick in the round | Medium |
| Plinko | One bounce path | One drop | Medium |
| Blackjack | One card sequence | One hand | Higher |
| Roulette | One pocket, then each bet type | One spin | Highest |
How does the cryptographic commitment work?
The commitment is a SHA-256 hash of the server seed, shown to you before the bet, so the seed can’t be changed once you’ve wagered. Power.Win’s provably fair page describes the sequence: a secret seed hashed in advance, a client seed you control, a nonce, and a reveal on rotation.
What does the server seed hash prove?
The hash is a one-way fingerprint of a secret value, which is what makes it a commitment. SHA-256 is defined by NIST FIPS 180-4 and no one can feasibly find a second seed with the same hash. Showing you that hash first is what locks the seed in place.
What does the client seed do?
The client seed is your contribution to the result, generated in your browser and replaceable with any value you choose. Power.Win states that you can override and set your own client seed at any time. Once you’ve supplied it, no outcome could have been arranged around inputs the operator already knew.
What is the nonce for?
The nonce is a counter that starts at 0 and rises by 1 with every bet, so the same seed pair produces a different result each time. Without it, two identical bets on the same seeds would land the same outcome. With it, you can point to the exact bet you want to check.
What happens when you rotate seeds?
Rotating seeds retires the current server seed and reveals it, which is the only way to see a value that had to stay secret while it was live. Hash the revealed seed yourself and compare it with the commitment. If they match, the seed you’re holding is the one every round on that pair was generated from.
What is the house edge on each game?
The house edge on each game is read off the odds the game shows you, because Power.Win’s game pages put the odds inside the game rather than in one headline figure. Provably fair doesn’t shrink the edge. It proves the visible edge is the only cost and the result wasn’t changed afterwards.
| Game | Where the edge sits | How you read it |
|---|---|---|
| Dice | The multiplier for the line you set | Multiply payout by win chance; what’s missing from 1.00 is the edge |
| Crash | The multiplier curve | Each cash-out point is priced like a dice line against its own probability |
| Mines | The multiplier at each safe pick | Compare it with the true chance of that pick given the mines left |
| Plinko | The payout in each bucket | Compare each bucket’s payout with the probability of landing there |
| Blackjack | The table rules | Decks, dealer rules and blackjack payout set the edge under basic strategy |
| Roulette | The single zero on a European-style wheel | 37 pockets, 35 to 1 on a number, 2.70% on every bet |
How do you read the edge off a dice multiplier?
Multiply the payout by your win chance, and whatever is missing from 1.00 is the house edge. Roll under 50.00 is a 50.00% win chance, so a game charging nothing would pay 2.0000×. A displayed 1.9800× is 0.50 × 1.98 = 0.99, a 1.00% edge, and 1.9600× is 2.00%.
Why is the roulette figure the same on every bet?
A European-style wheel has 37 pockets and a winning number pays 35 to 1, so you’re paid as if there were 36 pockets. That gap is one part in 37, or 2.70%, and the same arithmetic holds for a split, a column or red.
How do you verify a result yourself, step by step?
You verify a result in five moves: save the hash before you bet, set your own client seed, note the nonce of the bet you’re checking, then rotate seeds and hash the reveal. Power.Win says verification can be done through its interface or independently with external tools.
- Save the server seed hash the site shows before your first bet, somewhere outside the site.
- Set your own client seed in the fairness settings, so you know what went into every result.
- Note the nonce of the round you care about. The first bet on a seed pair is nonce 0.
- Rotate seeds after the round, which reveals the server seed you were playing on.
- Hash the revealed seed with SHA-256 and compare it with the hash from step 1, then run the seed, client seed and nonce through the published formula.
What does the worked example look like?
Suppose you saved the commitment 4e323a4c… before playing, set the client seed to powerwin-check, and after rotation the site reveals the server seed 4e2c7a9b…9a2c, a 64-character hex string. SHA-256 over that revealed seed has to reproduce the commitment you saved, digit for digit. If it does, the commitment holds.
How is each result reproduced from the seed pair?
Reproducing a result runs the seed, the client seed and the nonce through the published formula. Many dice implementations use the HMAC construction from IETF RFC 2104, keyed with the server seed. Run the same seed pair at nonce 0, 1 and 2 and you get three different numbers, which is what the nonce is there to do.
What if the numbers don’t match?
A hash mismatch means the seed you were shown isn’t the seed you played on, which is the one thing the mechanism exists to expose. A result mismatch usually means a different formula, byte count or separator from the one the site documents. Only a matching hash with a differing result is a real fairness question.
Why are third-party slots certified rather than provably fair?
Third-party slots are certified rather than provably fair because you can’t reproduce a spin from a seed you were shown: an outside studio built the game and keeps its generator to itself. Provably fair and certified are two different assurances, a per-round proof you run versus a laboratory report on a generator.
Which Power.Win games are certified rather than provably fair?
The slots, live dealer tables and instant games in Power.Win’s casino come from certified third party providers, and the assurance there is certification rather than a seed you can hash. The six PWR Originals are the provably fair set; the two labels are never interchangeable.
What does the RNG certificate cover?
The RNG certificate covers the operator’s own generator, not any individual round. Power.Win’s certification was issued to 3-102-968317 SRL by Lean Lab Company Limited of Malta, and the certificate PDF is published on the site. The report covers the generator; the seed check covers your bet.
What should you check before you trust a provably fair label?
Check that the proof is complete before you rely on the label, because a badge with a missing piece is a claim rather than a proof. Six things have to be true, and you can confirm them all without depositing.
- The server seed hash appears before the bet. If it’s shown after, it isn’t a commitment.
- You can set the client seed yourself. A fixed or locked client seed means the operator knew every input.
- The nonce is visible and starts at 0. You need to name the exact bet you’re checking.
- Rotation reveals the previous server seed. Without the reveal, nothing is checkable.
- The formula is written down. Which function, which inputs, in which order, and how the output maps to the game.
- The label is applied to the right games. In-house games can be provably fair; a third-party slot can only be certified.
Frequently Asked Questions
Which provably fair game is the easiest to verify?
Dice, because a single output maps to a single number on a 0.00 to 99.99 scale and you already know the line it had to clear. Crash is close behind with one multiplier per round, while roulette takes the most steps because each bet type is resolved separately.
Is a certified slot the same as a provably fair game?
No. A certified slot has had its generator tested by a laboratory, which is a report about the generator as a product. A provably fair game gives you the seed, the hash and the nonce so you can reproduce your own round. They’re two different assurances, and an outside studio’s slot carries only the first.
Can you change the client seed?
Yes. Power.Win states that the client seed is generated on your side and that you can override it and set your own at any time. Setting it yourself means you’ve contributed an input the operator didn’t know in advance, so no result could be arranged around known values.
Read More: Provably Fair Explained: How Players Can Verify Results · Best Crypto Dice Sites: What to Check
Sources (Citations)
- NIST FIPS 180-4, Secure Hash Standard
- IETF RFC 2104, HMAC: Keyed-Hashing for Message Authentication
- Power.Win: Provably Fair mechanics
- Power.Win: RNG certification
Power.Win is operated by 3-102-968317 SRL, Costa Rica, licensed by the Tobique Gaming Commission, licence 0000209.
Take the Lead, Gamble Responsibly
Gambling is entertainment. It is never an income and never a fix for a money problem. Set a limit before you start, keep an eye on how much you are playing, and know when to stop. Deposit limits, self-exclusion and reality checks are all on the Responsible Gambling page, and if it stops feeling like a choice, the National Council on Problem Gambling has free and confidential help.
By the Power.Win Editorial Team.