#World Cup Predictions: 100,000 USDT Daily #2026 World Cup Posting Challenge on HTX Square #HTXCommunity4thAnniversary Key Hunters Eye $58.87M Bitcoin Puzzle as 916 BTC Sits Unsolved in 78 Addresses
A Challenge Built Over a Decade
The puzzle did not begin as the massive bounty system it is today. Its earliest verified onchain origin is a Jan. 15, 2015, transaction that funded 256 outputs with rewards scaling from 0.001 $BTC to 0.256 $BTC, totaling 32.896 $BTC. A Bitcointalk thread opened Dec. 28, 2015, under the title "Bitcoin puzzle transaction ~32 $BTC prize to who solves it" marked the first major public discussion of the challenge.
A simulated flow chart using mempool.space visuals of the original Bitcoin Puzzle Challenge transfer that occurred on Jan. 15, 2015. The entire batch payment was confirmed at block height 339085.
The structure changed materially in 2017 when funds from addresses 161 through 256 were moved into the lower-range addresses, consolidating the challenge to 160 active puzzles. In 2019, the creator sent small outgoing transactions from every fifth address in a sequence that included 65, 70, 75, 80, and up through 160. Those partial spends revealed public keys onchain for those outputs, a detail that later proved significant for how solvers could approach those specific puzzles.
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