lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #125

found · spent

12.5 BTC nominal2124 candidate keys

Where it sits on the line

Puzzles #113–#137: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #125 is highlighted. The line sits at 2^69. #113 · 2^112 #114 · 2^113 #115 · 2^58 #116 · 2^115 #117 · 2^116 #118 · 2^117 #119 · 2^118 #120 · 2^60.5 #121 · 2^120 #122 · 2^121 #123 · 2^122 #124 · 2^123 #125 · 2^63 #126 · 2^125 #127 · 2^126 #128 · 2^127 #129 · 2^128 #130 · 2^65.5 #131 · 2^130 #132 · 2^131 #133 · 2^132 #134 · 2^133 #135 · 2^68 #136 · 2^135 #137 · 2^136
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 263 search steps — below the line (269).

Every puzzle below the line has been found.

Model: kangaroo. The public key has been on chain since 2019, so the square-root shortcut applies: about 2 × 2(N−1)/2 group operations.

How the work is estimated

Record

P2PKH address
1PXAyUB8ZoH3WD8n5zoAthYjN15yN5CVq5
mempool.space Blockstream
Known public key
0233709eb11e0d4439a729f21c2c443dedb727528229713f0065721ba8fa46f00e
HASH160
f7079256aa027dc437cbb539f955472416725fc8
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
2124 → 2125 − 1
start0x10000000000000000000000000000000
end0x1fffffffffffffffffffffffffffffff
Interval size21267647932558653966460912964485513216 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
797930
Evidence
Community report
Catalog label
RetiredCoder
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: 77.03%

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.

000000000000000000000000000000001c533b6bb7f0804e09960225e44877ac

Mentioned in the atlas

Where #125 comes up in the room pages. rooms 7 · mentions 7

History
Cases
People
Theories
Scale
Glossary
Library

Method

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