Mine Your Block: Free Bitcoin mining game
Pick your difficulty, hash once, find the block.
8000000000000000000000000000000000000000000000000000000000000000································································Pick your target and mine. A lower target is harder to hit and pays more.
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.
- Choose your chance of finding the block, from 0.5 % to 95 %. Your multiplier is 0.98 ÷ chance: 50 % pays ×1.96, 10 % pays ×9.8, 1 % pays ×98.
- Press Mine: we compute your 256-bit hash. If it is below the target, you found the block and win chips × multiplier. If not, you lose the chips you played.
- On average 98 % of the chips played come back: the 2 % margin is what keeps chips scarce.
- 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
Real Bitcoin miners hash block headers until one comes out below the network’s target. The lower the target, the harder it is, and the fewer leading zeros a hash usually has. Mine Your Block lets you choose that difficulty yourself.
An easy target finds a block most of the time but pays little. A brutal target (down to 0.5 %) almost never hits, and pays up to ×196 the chips you play. Same idea as mining: more difficulty, bigger reward.
Where does my hash come from?
It is the HMAC-SHA256 of your play (server seed, client seed and nonce). Its first 8 hex digits decide the result, so “hash below target” is exactly the same as “roll below your chance”.
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.