You can win 14.9 BTC
Puzzle 149: same 2015 lock, 2^78× harder than 71. Keyspace 2^148. Still no account. The pot is on-chain.
On-chain proof · 14.9 BTC
1CXvTzR6qv8wJ7eprzUKeWxyGcHwDYP1i2No account. No deposit. You can scan with no wallet — the prize only has a destination if you paste an address.
- You
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- Today
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Each cell is a slice of Puzzle 71. Amber = already returned. The glow is what is being scanned now.
- Nobody has closed a range yet.
- Queue is empty.
This browser
geologic time
JS, not CUDA
A million GPUs
~1 year
dedicated software
All of Steam
~1 week
still a lottery
What is Puzzle 71?+
In 2015 someone funded a series of Bitcoin wallets on purpose and published the challenge. Each number is harder. 71 is still intact and is the default here. 72 is 2× harder. 73 is 4×. Anyone can check the balances on-chain — they do not depend on this site.
Where does the money go?+
If the key shows up, 6 BTC go to the address you pasted. The rest stays with the project. This build does not broadcast: the key stays in the tab and you see the hex. Public mempool spends of puzzle coins have already been sniped (66 and 69). Use a private channel if that day comes.
Does the key leave this tab?+
No. Signing, if it ever happens, happens in your browser. The pool only sees a nickname, a masked wallet, and closed ranges — the key never goes up.
What are the real odds?+
2⁷⁰ keys. About 1.18 sextillion. A serious gaming GPU, on dedicated software, still takes hundreds of thousands of years at the median. The browser is slower still. That is the math. The balance is still sitting there.
Do I need a wallet to start?+
No. A nickname is enough to scan and show up on the board. With no address, if the key hits there is nowhere to send the 6 BTC — paste one whenever you want.
Do I have to leave the tab open?+
Yes. A backgrounded browser kills the workers. Keep it visible. On a phone: charger, screen on. This page tries to hold the screen awake while you scan.
Curve and hashes in how it works · tools.
Binance tape warming up…
24h · 15 min · spot
- This site sees a nickname, a masked wallet, and closed ranges.
- The private key never leaves this tab or the miner. We cannot spend the pot.
- Not an investment. The odds are geological. The balance is on-chain — check it yourself.
Development and servers. This is not the puzzle prize — it keeps this house online.
