Halving Crash: Bitcoin crash game with free chips
The reward climbs until the halving cuts it. Cash out in time.
You play with chips: they are free (more every hour), you can lose them, and they are never bought, sold or swapped for sats. The weekly rankings pay real sats into your wallet. See the weekly rankings →
Provably fairCheck every result yourself
Before you play you see a fingerprint (SHA-256) of our secret server seed. Each play mixes that seed with your client seed and a counter (nonce): HMAC-SHA256(server seed, "client seed:nonce:round"), 4 bytes per number. When you change your client seed we reveal the old server seed, so you can recompute every past play in your own browser.
Sign in to see your seeds.
How to play
- You play with chips, not money. Chips are free: 10,000 when you join and more every hour. You can lose them all, and they are never bought, sold or swapped for sats.
- Set your auto cash-out, from ×1.01 to ×1000, and launch. If the halving comes at or after your cash-out, you win chips × cash-out. If it comes before, you lose the chips you played.
- The halving point is decided by the server before the curve starts, so there is no reflex to win: the animation only shows it. 1 % of launches halve at ×1.00 straight away.
- Your chance of reaching ×M is about 98 % ÷ M (×2 ≈ 49 %, ×10 ≈ 9.8 %). On average 98 % of the chips played come back.
- Every week the rankings (most chips won, most played, biggest win…) pay real sats into the winners’ wallets. Paying never gives you chips.
- Provably fair: every result comes from your seeds and a counter (HMAC-SHA256). Open “Provably fair” under the game to check any play in your browser.
About this game
Every four years the Bitcoin block reward is cut in half. In Halving Crash the reward multiplier climbs from ×1.00 and, at a random point, the halving hits and the round is over.
You decide before launch where you cash out. Cash out at ×1.5 and you will usually make it; aim for ×100 and you rarely will, but it pays a hundred times what you played.
Why can’t I cash out by hand mid-flight?
Because the result is fixed before launch (that is what makes it verifiable). A manual button would only test your connection speed, so you choose the cash-out up front.
Can I buy chips or cash them out?
No. Chips are free play tokens with no money value: they can’t be bought, sold or exchanged for sats. The only sats in the game come from the weekly rankings, paid from the prize pot.
How do the weekly rankings work?
Each week (Monday to Sunday, UTC) your plays count towards several rankings: most chips won, most chips played (plays with real risk), most block hits and biggest single win. The top places share real sats from the weekly pot.
How can I check a result is fair?
Before you play you see the SHA-256 fingerprint of our server seed. Change your client seed and we reveal the old server seed: recompute every past play in your browser from the “Provably fair” panel, or with any HMAC-SHA256 tool.