How to Verify a Crash Game Round — Simple Provably Fair Walkthrough

1. What Is a Crash Game and Why Verification Matters

Crash games include titles like Aviator, JetX, and Bustabit. In each round, a multiplier climbs—and crashes unpredictably—forcing players to cash out before it dips. Provably fair ensures the casino couldn’t tamper with outcomes after bets are placed .

2. Provably Fair Basics—Seeds, Hashes & Trust

The system works like a “sealed envelope”:

• Server seed: Secret generated by the casino, hashed and shared before play.
• Client seed & nonce: Controlled by or assigned to the player and iteration count per round.
• After the round, the server seed is revealed and must match the earlier hash; combining seeds determines the outcome — ensuring it was predetermined and fair .

3. Step-by-Step Walkthrough: Verifying a Crash Round

1. Before the Round
   • Locate the server seed hash, visible in the game’s provably fair interface.
2. During the Round
   • Record your client seed (if allowed) and the round’s nonce or ID.
3. After the Round
   • Retrieve the revealed server seed and publicly displayed result or crash multiplier.
4. Verify the Hash
   • Hash the revealed server seed using the specified method (typically SHA-256) and ensure it matches the pre-round hash. If not, it’s a red flag .
5. Recompute the Outcome
   • Use the formula (e.g., HMAC_SHA256(serverSeed, clientSeed + nonce)) or the game’s documented algorithm, then apply mapping rules (e.g., %10000 /100 for multipliers). The result should match the output shown in the game. If it matches, the round was fair.

4. Example Walkthrough (Hypothetical)

• Server seed hash (before round): abc123...
• Client seed: playerSeed
• Nonce: 5
• Revealed server seed: secret123
• Hash check: SHA256("secret123") → equals abc123...—good!
• Compute HMAC: HMAC_SHA256("secret123", "playerSeed5") → get hex, then map to multiplier (e.g., 22.47x) matching the game.

If all checks align, the result is verifiably fair.

5. Optional: Use External Verifier Tools

Web tools like BTCGosu’s Verifier allow you to input the casino data and validate fairness without manual calculation .

6. Common Implementation Notes

• Game providers like BGaming use algorithms: Result + Secret → SHA-256 → share hash, then combine with client seed for final outcome .
• Different crash games may vary in hash function and mapping; always follow their in-game instructions.

7. Quick Verification Checklist

Step	Action
	Copy the server seed hash before betting
	Record your client seed and nonce during the round
	After the round, get the server seed reveal and result
	Verify the hash of server seed matches the pre-round hash
	Compute and map the random value; it must equal the actual round outcome
	Use verifier tool if unsure (e.g., BTCGosu)

8. Pro Tips & Red Flags

• Not matching hash? That’s a clear sign something’s wrong.
• No provably fair UI? Skip deposits—do not trust the game’s fairness.
• Round data missing (like nonce or seeds)? Choose other platforms. Always verify.

9. Why This Matters

Verifying individual crash rounds ensures transparency — players can trust outcomes weren’t changed after bets. This level of accountability—absent in traditional RNG systems—is the core appeal of provably fair gaming.