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BTC Dice Simulator

Practice bitcoin dice with play money and the exact provably fair math real sites use: HMAC-SHA256 rolls, committed server seeds, auto-bet with martingale settings. No signup, no deposit, nothing to lose.

Place Your Bet

1.0
2.0000x
roll under 49.50

Auto-Bet

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READY
Rolls
0
Wins
0
Wagered
0
Profit
0
Max loss streak
0

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Ready for the real thing?

These are the dice sites we tested hands-on. None accept US players; check your jurisdiction first.

Stake Roobet Gamdom Rainbet
NonceRollTargetBetProfit

Provably Fair Seeds

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Current nonce: 0

How this simulator works

Every roll is derived exactly the way real bitcoin dice sites do it. Before you roll, the simulator generates a random server seed and shows you its SHA-256 hash. Each roll computes HMAC-SHA256(serverSeed, clientSeed:nonce), takes the first 4 bytes as a number, and reduces it mod 10000 to a roll between 0.00 and 99.99. When you rotate seeds, the previous server seed is revealed so you can recompute every roll yourself in our provably fair verifier.

The payout is 99 / win chance, which is a standard 1% house edge. That means the simulator's long-run behavior matches what a fair 1% edge site does to a bankroll: useful for testing martingale, paroli, or any plan from our strategy hub before risking real satoshis.

The bankroll is play money stored in your browser. Nothing is wagered, nothing can be won or withdrawn, and no account exists.

Dice Simulator FAQ

Is this dice simulator really free? +
Yes. The bankroll is play money stored only in your browser. There is no signup, no deposit, and no way to win or lose real bitcoin here.
Does the simulator use the same math as real BTC dice sites? +
Yes. Rolls come from HMAC-SHA256 over a committed server seed, your client seed, and an incrementing nonce, reduced mod 10000, with a 99/chance payout (1% house edge). It is the same construction most dice sites document on their fairness pages.
Can I test martingale on the simulator? +
Yes. Set auto-bet to multiply the bet on loss (2x is classic martingale), pick a stop-loss, and run a few hundred rolls. Watch the max loss streak stat: that is the number that ends real bankrolls.
Why did my bankroll bust even with a strategy? +
Because no betting pattern changes the 1% house edge. Progressions only redistribute when you lose, not whether you lose. Our strategy guides quantify this with million-roll simulations.