spunk.bet → Blog → Provably Fair Guide
Updated February 2026 · 16 min read
At a traditional casino -- online or physical -- you trust the operator. You trust that the cards are shuffled fairly. You trust that the slot machine RNG is honest. You trust that the roulette wheel isn't rigged.
But how do you know? You don't. You rely on licensing bodies and auditors. These help, but they're not perfect. Audits happen periodically, not on every bet. Licenses can be bought in questionable jurisdictions.
Provably fair eliminates this trust problem entirely. Instead of trusting people, you trust math.
Provably fair is a system that lets you mathematically verify that every bet result was determined fairly. It uses cryptographic hashing -- the same technology that secures Bitcoin.
The key idea: the casino commits to a result BEFORE you place your bet, but doesn't reveal it until after. You can then verify that the committed result matches what was shown. If the casino tried to change the result, the math wouldn't add up.
The casino picks a secret number (server seed) and gives you a locked version of it (a hash). Think of it like putting the answer in a sealed envelope. You can see the envelope but can't read the answer inside.
You also contribute a random number (client seed). This ensures the casino can't predict your input. The game result is calculated from both seeds combined.
The casino reveals the secret number. You can now open the envelope and verify: does the secret number match the locked version? Does combining both numbers produce the result you saw? If yes on both counts, the bet was fair.
For those who want the full technical picture:
A random string generated by the casino for each session. Before any bets, the casino shows you the SHA-256 hash of this seed. SHA-256 is a one-way function -- you can't reverse the hash to find the seed, but you can verify the seed produces the hash later.
A random string you provide (or the system generates for you). This is your contribution to the randomness. The casino cannot predict your client seed.
A counter that increments with each bet. It ensures each bet in a session produces a different result, even though the seeds stay the same.
The game result is calculated by combining: HMAC-SHA256(server_seed, client_seed:nonce). This produces a hex string that's converted into a game result (dice number, crash point, mine locations, etc.).
Before you start betting, the casino shows you a hashed version of the server seed. Save this hash.
Play normally. Each bet uses the server seed (hidden), your client seed, and an incrementing nonce.
When you're ready to verify, ask the casino to reveal the server seed (this usually rotates the seed to a new one for future bets).
Take the revealed server seed and run it through SHA-256. Does the hash match what you saved in Step 1? If yes, the seed wasn't changed.
Using the server seed, your client seed, and the nonce for any specific bet, recalculate the result. Does it match what the casino showed you? If yes, that bet was fair.
Every single game is provably fair. Check the math yourself. Zero trust required.
Play Provably FairProvably fair is powerful but not perfect. It doesn't protect against:
Provably fair is necessary for a trustworthy crypto casino, but it's not sufficient by itself. Also check house edge, withdrawal policies, and community reputation.
It means every bet result can be mathematically verified using cryptographic hashes. The casino commits to a result before your bet, and you can verify it after. No trust needed -- just math.
Look for: server seed hash shown before bets, client seed you can set, nonce tracking, and the ability to reveal and verify the server seed. If any of these are missing, it's not truly provably fair.
Provably fair prevents rigged game results, but a casino could still scam through withdrawal blocking, hidden fees, or disappearing with funds. Always check the full reputation, not just provably fair status.
Yes. Every game on SPUNK BET is provably fair. You can verify any bet at any time using SHA-256 hashing. The system is transparent and checkable.
No. Most provably fair casinos have a built-in verification tool. You click a button and it shows you the math. You can also use third-party verification tools online.
10,000 SPUNK daily. Every game verifiable. Trust math, not promises.
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