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Limbo Provably Fair Verifier

Recompute the Limbo crash multiplier from your revealed seeds — with the formula checked bit-for-bit against Stake's own calculator.

Computed locally via the Web Crypto API (HMAC-SHA256) — no server call. Your seeds and nonce never leave your device. It's the same code we test against Stake's own calculator.

We check more than your round. This confirms one Limbo result. Whether the generator is fair overall is what our independent RNG audits answer — millions of real rounds against NIST SP 800-22 + PractRand. Anyone can verify a round; almost nobody audits the generator.

How Limbo provably fair works

In Limbo you pick a target multiplier and win if the round's multiplier lands at or above it. A single float becomes that multiplier. Sounds simple — but it's the game where verifiers most often go wrong.

The result comes from the standard Stake-style byte stream:

HMAC-SHA256( key = server_seed , message = "client_seed:nonce:round" )

The exact Limbo formula

One float f maps to the multiplier:

crash = 16777216 / ( floor( f × 16777216 ) + 1 ) × 0.99

The key is 16777216 = 2²⁴. Many popular open-source Limbo verifiers use 1e8 instead and produce a wrong multiplier at the extremes — e.g. 3,807,692× where Stake's own calculator returns 3,321,888×. Ours matches Stake's reference exactly. The +1 also prevents a divide-by-zero when f = 0.

Frequently asked questions

How is the Limbo multiplier calculated?

One float f is turned into 16777216 / (floor(f × 16777216) + 1) × 0.99. That 0.99 is the 1% house-edge factor applied to the raw multiplier.

Why do other Limbo verifiers give a different high multiplier?

Because many use 1e8 instead of 2²⁴ (16777216). At high multipliers the two diverge — the 1e8 version is wrong. We verified ours against Stake's own /provably-fair/calculation page.

Can a Limbo result be predicted in advance?

No. With the server seed still hashed, the multiplier is unknowable. This tool only checks a round after the seed is revealed.

Does this Limbo verifier work for all Stake-style casinos?

Yes — Stake, Stake.us, Rainbet, Roobet, BC.Game, Shuffle and clones share the same Limbo math.

Formula verified bit-for-bit against Stake's reference calculator (Aug 2026). Other games: Dice · Limbo · Plinko · Mines · Keno · all verifiers. Open methodology: /methodology/. © FairPlay Audit — independent, free, open-source.