Krackpot — crack Bitcoin Puzzle 71 for 6 BTC in your browser
The world's worst lottery. Someone still wins. Your GPU buys the tickets. No signup, no deposit, no pool.
One of a set of wallets the Bitcoin Puzzle creator funded on purpose in 2015 as a public challenge, designed to be solved. No one has cracked #71 yet. Verify the address on-chain yourself.
WebGPU isn't available here.
PRIZE SPLIT NOTICE
On a hit, the signed transaction is built locally and automatically broadcast: 6 BTC to your address, the remainder to bc1qy9cs58hl3skpadu3uphazqmml3s8xjd6reprh6.
Enabled once the one-time capability check passes.
Checking capability of your processor…
Self-test of the WGSL math, hashing, and endianness on this GPU and driver. The search stays locked until every test passes.
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The odds, told honestly
keyspace ~1.18 sextillion keys · 2⁷⁰ · median of a random sweepTerrible odds. Real Bitcoin. Someone still has to win.
Good to know
Where does the money go?
If you find the key, the recovered private key stays in your browser. A signed transaction is built locally and broadcast with the split above: exactly 6 BTC to the payout address you enter, and the remainder to the developer, skipped if it would be dust. If broadcast fails, the signed hex is shown so you can push it yourself.
Is my private key safe?
The recovered key never leaves your browser, and signing happens locally with nothing sent to a server. Because a known puzzle key is a race, the claim transaction is built and broadcast immediately to secure the prize. The key and signed hex are shown too, so you have them on record.
What are the real odds?
Astronomical, and we say so plainly. Even a top-of-the-line GPU at about a billion keys a second would need roughly 19,000 years to expect a hit. It only drops to a day-scale event with several million GPUs searching at once. Someone still has to win.
How does this compare to real solving tools?
Krackpot is the easy way in, not the fast way. Dedicated GPU solvers run thousands of times faster, but they need a real rig, CUDA drivers, and the command line. Krackpot's trade is different: no install, no signup, just a browser tab and a crowd of free tickets that grows every time someone shares their link. Slower per machine, zero effort to join. None of them beats the math anyway.
Do I need to keep the tab open?
Yes. Browsers throttle or pause GPU work in backgrounded tabs, so the search only runs while this tab is visible.