lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #51

found · spent

5.1 BTC nominal250 candidate keys

Where it sits on the line

Puzzles #39–#63: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #51 is highlighted. The line sits at 2^69. #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 #54 · 2^53 #55 · 2^54 #56 · 2^55 #57 · 2^56 #58 · 2^57 #59 · 2^58 #60 · 2^59 #61 · 2^60 #62 · 2^61 #63 · 2^62
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 250 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
1NpnQyZ7x24ud82b7WiRNvPm6N8bqGQnaS
mempool.space Blockstream
Known public key
028c6c67bef9e9eebe6a513272e50c230f0f91ed560c37bc9b033241ff6c3be78f
HASH160
ef6419cffd7fad7027994354eb8efae223c2dbe7
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
250 → 251 − 1
start0x4000000000000
end0x7ffffffffffff
Interval size1125899906842624 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
460495
Evidence
On-chain
Catalog label
LBC
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: 82.86%

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.

00000000000000000000000000000000000000000000000000075070a1a009d4

Method

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