lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #27

found · spent

2.7 BTC nominal226 candidate keys

Where it sits on the line

Puzzles #15–#39: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #27 is highlighted. The line sits at 2^69. #15 · 2^14 #16 · 2^15 #17 · 2^16 #18 · 2^17 #19 · 2^18 #20 · 2^19 #21 · 2^20 #22 · 2^21 #23 · 2^22 #24 · 2^23 #25 · 2^24 #26 · 2^25 #27 · 2^26 #28 · 2^27 #29 · 2^28 #30 · 2^29 #31 · 2^30 #32 · 2^31 #33 · 2^32 #34 · 2^33 #35 · 2^34 #36 · 2^35 #37 · 2^36 #38 · 2^37 #39 · 2^38
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 226 search steps — below the line (269).

Every puzzle below the line has been found.

Model: range scan. Every candidate key in the interval is hashed and compared with the address.

How the work is estimated

Record

P2PKH address
128z5d7nN7PkCuX5qoA4Ys6pmxUYnEy86k
mempool.space Blockstream
Known public key
031a864bae3922f351f1b57cfdd827c25b7e093cb9c88a72c1cd893d9f90f44ece
HASH160
0c7aaf6caa7e5424b63d317f0f8f1f9fa40d5560
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
226 → 227 − 1
start0x4000000
end0x7ffffff
Interval size67108864 scalars. Exact BigInt bounds, not a floating estimate.

Snapshot 2 Oct 2026. The reward is the catalog's nominal allocation (N × 0.1 convention from 2023-04-16; earlier spends predate it), not a live balance. A key that matches the address proves the math, not that the coins are still there: check an explorer. Missing fields are omitted, not invented.

Solution record

Catalog date
Block
339113
Evidence
On-chain
Catalog label
12x45A
A spend proves key control, not a forum identity.
Transactions
mempool.space tx Solve transaction · Blockstream

Where the key sat in its range

Published position in range: 66.82%

0% · start of rangeend of range · 100%

Published historical scalar (already public)

This hex scalar is already in the public puzzle corpus. It is historical evidence, not a live key to import. This page does not produce WIF and does not handle secret material.

0000000000000000000000000000000000000000000000000000000006ac3875

Method

Historical record. Method notes for open puzzles live on the method page.