Puzzle 66: nine years of hunting and an eight-minute endgame
The loudest story of the Bitcoin Puzzle series: a key that thousands of people worldwide hunted for was finally found in the autumn of 2024 - and within minutes the coins went somewhere nobody expected. Here is how it happened, straight from the blockchain, and what that night changed for every hunter.
01What this puzzle was and why #66 mattered
In the 160-puzzle series every next number doubles the key range and makes brute force noticeably heavier. By 2024 every puzzle up to #65 had been solved, and #66 became the frontline of the whole hunt: the first address nobody had reached by honest search. It held 6.6 BTC - around 400 thousand dollars at the time.
The puzzle creator kept the fire burning all those years: the blockchain shows the reward growing.
02Nine years of hunting
Everyone ground away at puzzle 66: loners on home GPUs, rented farms, home-built clusters. A range of 265 keys left no chance to walk it alone in reasonable time, so people teamed up into pools: everyone scans their slice, findings get shared. By the summer of 2024 the participants numbered in the thousands and the combined speed in tens of billions of keys per second.
Pools had a weak spot few people thought about: the first to see a result is not the person whose GPU found the key, but whoever runs the pool servers. The whole construction rested on the admin\u0027s word of honour.
Nine years of searching. Eight minutes of endgame.
03The night of September 12, 2024
On the evening of September 12, 2024 someone finally computed the key and broadcast a withdrawal. And at that very second the trap the mathematicians had warned about snapped shut: the moment a transaction enters the open queue of the network, the public key of the address is revealed for the first time. For a normal wallet that means nothing. But for a 66-bit range, knowing the public key shrinks the problem millions of times - modern methods derive the private key in minutes.
From there it was a race: other people\u0027s bots saw the transaction, derived the key and pushed their own versions with higher fees. The bidding war for a place in the block was on.
The endgame by the clock (UTC, from the blockchain)
04What that night taught everyone
Puzzle 66 became a cold shower for the whole hunt. It exposed two weaknesses at once: the pool - because the find passes through someone else\u0027s infrastructure, and the open withdrawal - because on small ranges a revealed public key equals a gifted private one. The solvers of the next puzzles - 67, 68, 69 - already withdrew quietly, through private channels to miners, bypassing the open queue, and it worked.
Withdrawing the coins is a solvable problem. But the only protection against other hands between you and the key is the right search architecture.
05Why this cannot happen in Galaxy 71
Our architecture
In Galaxy 71 a patch is assigned to a specific person before it is computed: your click and your sector are recorded as yours. A key found in your patch comes only to you, encrypted - the service does not see it and cannot see it. There is no shared pot here that a pool admin can peek into: there is nobody between you and the key.
And one detail that matters: a single click on the map is one actually computed patch of the key space. The key to puzzle 71 sits in one of those patches, and nobody knows which - your very first click has exactly the same claim on the find as a hunter\u0027s millionth patch.
Withdrawing the coins is a separate task, and a solvable one: the solvers of puzzles 67-69 managed it.
Watch the #71 hunt06Questions people ask
Who ended up with the 6.6 BTC?
The blockchain shows addresses, not names: both transactions went to fresh addresses and their owners never confirmed themselves publicly. The finder-versus-interceptor dispute was never settled.
Can the same happen with puzzle 71?
The physics of the network is the same, and the withdrawal risk exists for any finder - which is exactly why 67-69 were withdrawn through private channels. The difference lies elsewhere: in Galaxy 71, until the moment of withdrawal the key is known only to the patch owner - it never passes through a pool, a service or anyone else\u0027s hands.
What is at stake on puzzle 71 right now?
7.10 BTC on a public address - verifiable on the blockchain any second. The hunt is running right now and the progress is visible on the live map.
Read more: How Galaxy 71 works What is Bitcoin Puzzle #71 Hunt progress All 160 puzzles
Galaxy 71 · Bitcoin Puzzle #71 · blockchain.