6 BTC is yours if you crack a Bitcoin wallet that was built to be cracked. It's Puzzle 71, funded on purpose in 2015 as a public challenge. It holds about 7.1 BTC and nobody has solved it. The address is on-chain, so verify it yourself. I built Krackpot: point your GPU at it, right in the browser. secp256k1, SHA-256 and RIPEMD-160 all run as WebGPU compute shaders. There is no backend, no signup, and no pool. Open devtools and read the source. If your GPU finds the key, it stays in your browser and the app builds and signs the claim transaction locally. The odds are the whole point, and I'd rather you have them up front: - One gaming GPU: nearly a million years to expect a hit. - A million GPUs grinding: about a year. - Every Steam gamer at once: about a week. Those are measured rates from real devices, not spec-sheet math. Someone still has to win. The split: crack it and 6 BTC goes to your address, the rest goes to me. It's on the page before the start button, so if you don't like it you can close the tab before your GPU does any work. Free ticket. Terrible odds. Real Bitcoin.

Krackpot

Krackpot: crack Bitcoin Puzzle 71 for 6 BTC

6 BTC sits in a wallet built to be cracked. Your GPU buys the tickets. Terrible odds, real Bitcoin, someone still wins.

is the only domain for this. Anything else is a clone, probably with the payout address swapped.