Provably Fair & Game Fairness in Crypto Casinos
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Provably fair is a cryptographic system designed to put you in control of verifying game fairness. Unlike traditional online casinos that rely on RNG audits and external oversight, provably fair lets you see the math behind every round.
This page explains how you can double-check your game outcomes yourself and which verification tools you can use.
Verify Provably Fair Game Results Yourself
We've created the free Kryptocasinos.com provably fair verification tool, which you can use to check game results. All you need is the unhashed server seed, client seed, and bet number.
How It Works
Provably fair casinos generate results using cryptographic hashing. The server seed is hashed and shown before your bet, so the casino cannot change the outcome after you play. You can verify any bet using the unhashed server seed revealed after the bet.
Enter the seeds and nonce from your bet to verify the result.
Result
A Simple Step-by-Step Example: How to Check Game Fairness
See how to verify a game’s fairness with this crash game example:
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Step 1: Copy the Current Hashed Server SeedThe server generates a random seed and turns it into a hashed version. Copy this hash before you start playing.
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Step 2: Don’t Forget the Client Seed
Make sure you know your client seed, or set a new one manually before placing a bet on the crash game.
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Step 3: Watch the Round Play Out
The game combines the server seed, your client seed, and the nonce. It calculates the outcome, such as a crash round ending at a 1.6x multiplier. After the round, the server reveals the original seed so the calculation can be checked.
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Step 4: Verify the Result
You can now verify the outcome yourself. You can use the casino’s built-in verification tool, a third-party hash calculator, or our Kryptocasinos.com Provably Fair verification calculator.
Many crypto casinos make their verification tools easy to find. Cybet, for example, includes a Verify Fairness section in the left navigation menu. This takes you straight to the page where you can learn more about the provably fair concept under the Overview tab, or go directly to the Verification tab. There, you can choose games like Crash, Limbo, Dice, Plinko, or Mines, enter your client hash and client seed, and check the result for yourself.
What To Do if the Results Don’t Match?
Your calculated result should match the game’s outcome in the casino. If it does, that confirms the outcome was determined before your bet, and there’s no way it could have been changed afterward. This is your proof that the game is fair.
If the numbers don’t match:
- Double-check all input values, especially the nonce and client seed
- Make sure the server seed is correctly revealed
- Verify the result using a second, external tool
If the mismatch persists, reach out to the casino’s support and avoid placing more bets until the problem is cleared up.
What Is Provably Fair?
Provably fair is a cryptographic system that lets you verify game results yourself. Instead of relying on regulators or testing labs, the responsibility is in your hands. You check the fairness of each game on your own. The result is locked in before you place a bet and can’t be changed afterward. This shifts fairness control from audits to the player. It’s why provably fair is common in crypto casinos, especially for in-house games where no external testing lab is involved.
How Does It Work?
In provably fair games, the outcome is mathematically set before you place your bet. The result is only revealed after the round finishes. This system relies on three key elements:
The player seed is your input. Most casinos generate one for you automatically, but you can also set your own. Either way, it becomes part of the math that decides the outcome. That’s important because it means the casino isn’t in full control. If the site tried to change the result after your bet, the server seed would also have to change and the hash would no longer match. You would catch the casino trying to mess with it.
The server seed comes from the casino. Before the round starts, the seed is hashed, which means it gets scrambled into a string of characters that looks completely different from the original number. You get the hash before you play, which stops the casino from changing anything later. After the game, the original seed is revealed so you can check that everything ran fairly.
The nonce is a number that goes up with every bet you place. It helps make sure outcomes don’t repeat and that each game is unique even when the same seeds are used. Every new round produces a different outcome because the nonce changes each time.
After the player seed, server seed, and nonce are set, they together decide the outcome of the game. This combination is protected using cryptography, including HMAC (which makes sure the data hasn’t been tampered with) and SHA512 (which turns the data into a long, unique string). These systems make it impossible for anyone to change the result once the round has started.
What This Means For You?
- Outcomes are determined before you bet.
- The casino can’t adjust results afterward.
- You can verify the outcome through disclosed seeds and hashes.
Tools for Verifying Provably Fair Games
Besides the Kryptocasinos.com provably fair verification calculator, there are other ways to check the outcome of your game:
Built-in Verification Tools
Most crypto casinos with provably fair games also provide tools that you can use on the spot to verify your game results.
Third-Party Hash Calculators
If you need to double-check because the results don’t match, you can also try external verification tools such as Stake & BC.Game Verifiers, Bitcointalk Tools, or GitHub Open Source Verifier.
Provably Fair in Crypto Casinos
Provably fair has become a key feature as blockchain games and decentralized platforms grow. In spaces where no central authority oversees the action, these systems are often the only way to guarantee fair outcomes. Crypto communities value verification and user control, so players tend to favor these games.
In practice, you’ll mostly see provably fair used in in-house “Crypto Original” games. For example, at Thrill Casino you can check the results of games like Mines, Dice, Keno, Limbo, Plinko, Blackjack, and Slide yourself. Crypto gambling sites generally offer a wider selection of these verifiable games compared to traditional casinos.
This page is part of our wider Security and Risk Awareness in Crypto Casinos section, where we look at common risks and share tips to help you keep your funds safe.
Comparing Fairness in Crypto Casinos and Regular Casinos
Fairness is a key concern for any online casino player. Crypto casinos and traditional casinos approach it differently, each using its own system to make sure game results can be trusted.
| Aspect | Traditional Online Casinos | Provably Fair Crypto Casinos |
|---|---|---|
| Oversight | Strictly licensed and monitored | Often lightly regulated |
| Verification | Audited by external firms | Players verify outcomes themselves |
| Transparency | Limited to audit reports | Full visibility of seeds and outcomes |
| Randomness | Relies on RNG audits | Secured with cryptographic hash functions |
RNG Vs Provably Fair
Both Random Number Generators (RNGs) and Provably Fair systems aim for the same goal – ensuring fair game outcomes. How they achieve this, however, is quite different.
- RNGs use complex algorithms to produce unpredictable results, but as a player, you never see how those numbers are generated. Provably fair systems reveal the calculation for every round.
- With RNGs, you have to trust that the casino or game provider is honest and that the system has been properly tested and independently certified.
- Both are mathematically secure, but provably fair gives the player a level of control that classic RNG systems can’t offer.
Provably Fair Games
Provably fair can technically be applied to almost any casino game, but in practice, you mostly see it in so-called “Crypto Originals” like Dice, Crash, Plinko, and Mines. These are games built exclusively for the casino, making it easier to give players full control over the outcome.
Simple mechanics make dice games the most common Provably Fair titles. You can verify each roll using the server seed, client seed, and nonce.
Blackjack, poker, and roulette can be made Provably Fair too. The casino can share the necessary information for every hand or spin.
Provably Fair slots do exist, but they’re less common. Simpler slots are easier to make fully transparent. Most traditional video slots still use certified RNGs.
What Provably Fair Doesn’t Cover
Provably fair is a powerful system, but it has limits. It verifies that the game’s outcome was calculated fairly using the server seed, client seed, and nonce. However, it doesn’t address some other important aspects:
- Payouts: It can’t guarantee that the casino will pay your winnings correctly or on time, and it doesn’t prevent withdrawal issues.
- Disputes: It won’t help if the casino refuses to settle a disagreement or applies unfair rules outside the game itself.
- Game Odds: It doesn’t change the house edge, RTP, or bonus conditions.
- Player accounts: It doesn’t verify deposits, withdrawals, or other account activity.
So, provably fair shows that the game itself is fair, but it doesn’t replace good customer service or proper licensing. Always make sure to check other factors that make a casino reliable as well.
Final Thought
Provably fair gives you a way to check game outcomes yourself. Many crypto casinos use it for in-house games, so you can see the mechanics behind every result. This brings the transparency many players are looking for.
Keep in mind that provably fair only proves the calculation is fair. It doesn’t guarantee payouts, resolve disputes, or change the house edge or bonus rules. If you’re using a VPN, casinos may block your payouts, even when everything seems fine. Be sure to check the terms and conditions for your country or region to avoid any surprises when it’s time to withdraw.
Disclaimer: This website is for informational purposes only and does not constitute legal advice. Winnings are not guaranteed. Gambling can be addictive. Only play where legal in your region and check your local laws. Please gamble responsibly. | 18+
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