lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #41

found · spent

4.1 BTC nominal240 candidate keys

Where it sits on the line

Puzzles #29–#53: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #41 is highlighted. The line sits at 2^69. #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 #40 · 2^39 #41 · 2^40 #42 · 2^41 #43 · 2^42 #44 · 2^43 #45 · 2^44 #46 · 2^45 #47 · 2^46 #48 · 2^47 #49 · 2^48 #50 · 2^49 #51 · 2^50 #52 · 2^51 #53 · 2^52
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 240 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
1L5sU9qvJeuwQUdt4y1eiLmquFxKjtHr3E
mempool.space Blockstream
Known public key
03b357e68437da273dcf995a474a524439faad86fc9effc300183f714b0903468b
HASH160
d1562eb37357f9e6fc41cb2359f4d3eda4032329
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
240 → 241 − 1
start0x10000000000
end0x1ffffffffff
Interval size1099511627776 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
341194
Evidence
On-chain
Catalog label
1ghost
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: 32.63%

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.

00000000000000000000000000000000000000000000000000000153869acc5b

Method

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