PROVABLY FAIR VERIFIER

WHAT IS PROVABLY FAIR?

Provably fair is a cryptographic verification system used by crypto casinos to prove that game outcomes are genuinely random and have not been manipulated. Unlike traditional online casinos where you must trust the operator, provably fair systems let you mathematically verify every single bet you place.

The system relies on three key components: a server seed generated by the casino, a client seed that you can set yourself, and a nonce that increments with each bet. These three values are combined using HMAC-SHA256 hashing to produce a deterministic result. Because the server seed is committed (hashed) before the round begins, the casino cannot change it after seeing your bet. And because you control the client seed, the casino cannot predict the final outcome.

This approach shifts the trust model from blind faith to mathematical proof. After each round, you can take the revealed server seed, combine it with your client seed and nonce, and independently verify that the game result matches what the casino displayed. If the results match, the game was provably fair. If they do not, you have cryptographic evidence of manipulation.

HOW DOES PROVABLY FAIR VERIFICATION WORK?

The verification process follows a straightforward cryptographic protocol that any player can independently execute:

1. Before the round: The casino generates a random server seed and shows you its SHA-256 hash (the "hashed server seed"). This commits the casino to a specific seed without revealing it. You can also set your own client seed at any time.
2. During the round: The casino combines the server seed, your client seed, and the current nonce using HMAC-SHA256 to produce a hash. This hash is then converted into a game result using a game-specific algorithm (crash multiplier, dice roll, mine positions, etc.).
3. After the round: The nonce increments by one. When you rotate your server seed, the previous unhashed server seed is revealed. You can now verify every bet made with that seed pair.
4. Verification: Take the unhashed server seed, your client seed, and the nonce for any specific bet. Run them through the same HMAC-SHA256 function and game algorithm. If your calculated result matches the casino's displayed result, the outcome was fair.

The HMAC-SHA256 function is a one-way cryptographic hash. Given the same inputs, it always produces the same output. But it is computationally impossible to reverse-engineer the inputs from the output or to find different inputs that produce the same hash. This mathematical property is what makes the system tamper-proof.

WHICH CASINOS SUPPORT PROVABLY FAIR?

Most major crypto casinos implement provably fair verification for their original (in-house) games. Third-party slot and live dealer games typically use traditional RNG or live video verification instead. Here are the top platforms with provably fair systems:

• Stake — Full provably fair suite for Crash, Dice, Mines, Plinko, Limbo, Keno, Hilo, and more. Seeds accessible via Settings > Fairness.
• Roobet — Provably fair Crash, Dice, and Mines. Seeds available under your avatar > Fairness tab.
• BC.Game — Provably fair originals including Crash, Hash Dice, Classic Dice, Plinko, and Limbo. Seeds in Profile > Provably Fair.
• Bitstarz — Provably fair games available through their original game section with independent seed verification.
• Cloudbet — Provably fair Hi-Lo and original games with transparent seed management.

WHY SHOULD YOU VERIFY YOUR RESULTS?

Verification is the entire point of provably fair gambling. Without independent verification, provably fair is just a marketing buzzword. Here is why every player should verify at least some of their results:

Trust but verify. Even reputable casinos could theoretically be compromised by rogue employees, software bugs, or security breaches. Provably fair verification is your insurance policy. By checking results yourself, you confirm the system is working as intended.

Detect anomalies early. If a casino were to tamper with results, verification would catch it immediately. The HMAC-SHA256 hash would not match. While no major crypto casino has been caught cheating through provably fair manipulation, regular verification keeps the industry honest.

Understand the math. When you verify results, you gain a deeper understanding of how casino games work mathematically. You can see the house edge built into the algorithm (for example, the 4% house edge in Crash games) and make more informed decisions about your play.

Build confidence. Many players experience losing streaks and wonder if the games are rigged. Verification eliminates this doubt entirely. When you can prove mathematically that every result was fair, you can focus on strategy and bankroll management instead of worrying about manipulation.

HOW TO FIND YOUR SEEDS

Each casino stores your seed information in a slightly different location. Here is how to find your seeds on the most popular platforms:

1. Stake: Click your username in the top-right corner, go to Settings, then select the Fairness tab. You will see your active server seed hash, client seed, and total bets (nonce). Click "Rotate" to reveal the previous server seed for verification. You can also change your client seed at any time.
2. Roobet: Click your avatar in the top-right corner, then select Fairness from the dropdown. Your current hashed server seed, client seed, and nonce are displayed. To reveal the unhashed server seed, click "Change Seeds" which will rotate to a new seed pair and reveal the old one.
3. BC.Game: Navigate to your profile icon, then select Provably Fair. BC.Game shows your active and previous seed pairs with the nonce counter. Click "Rotate Seed Pair" to generate new seeds and reveal the previous server seed for verification. You can also view bet-level fairness data from your bet history.

Remember: the server seed is only revealed after you rotate it. This is by design — if you could see the server seed before betting, you could calculate the outcome in advance. The hashed version shown during active play proves the casino committed to a specific seed without revealing it.