Special Features · Provably Fair

Don't Trust the Casino. Check the Math.

In a fair game, the deck is cut before you sit down. Crash games that are genuinely provably fair work the same way: every result was dealt in advance and sealed. Pick a casino, paste a round hash, and turn the card over yourself. Everything runs in your browser — nothing is sent to us, or to them.

Awaiting a round

Game hash from your round Hash of the round played just before yours (optional, proves the chain link)

—Multiplier recomputed under Stake's published formula (1% edge)

—HMAC-SHA256 against the public salt — Bitcoin block 584,500, mined July 8, 2019, before any round existed

—Chain link: SHA-256 of your hash reproduces the previous round's hash

How the deck is cut

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Get the round hash

Every finished Crash round on Stake publishes its game hash. Click any round in the game history and copy it.

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Paste and verify

Your browser recomputes the multiplier from the hash using the published formula. The math runs locally with WebCrypto — this page works even offline.

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Check the chain

Paste the previous round's hash too and the page proves the chain link: ten million results, generated in advance, sealed with a Bitcoin block that had not been mined yet.

Why this works

Stake generated a chain of 10,000,000 hashes before its Crash game ever went live, each one the SHA-256 of the next. The chain was then salted with the hash of Bitcoin block 584,500 — a block that did not exist when the chain was committed. Rounds consume the chain in reverse, which means you can verify backward forever but nobody, including the casino, can compute forward. Every round's multiplier is fixed by math that was locked in place in 2019.

House rules, honestly: a green card proves this round's result was predetermined by the committed chain — the casino could not have altered it after your bet. It does not prove you will win: the published formula carries a 1% house edge on every round, and no verification changes that. It also says nothing about withdrawal speed or solvency.

Stake Crash spec v1.0 · documented July 17, 2026 · chain of 10,000,000 SHA-256 hashes, consumed in reverse · salt = Bitcoin block 584,500 (0000000000000000001b34dc6a1e86083f95500b096231436e9b25cbdd0075c4) · h = first 13 hex chars of HMAC-SHA256(key = game hash, message = salt) · multiplier = max(1.00, floor(99 × 2^52 / (h + 1)) / 100) · verified against 500,000 reconstructed rounds · if Stake changes its system, this spec gets a new version and date

18+ · Verify before you trust, and only bet what you can afford to lose.

Don't Trust the Casino. Check the Math.

How the deck is cut

Get the round hash

Paste and verify

Check the chain

Why this works

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