lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #2

found · spent

0.2 BTC nominal21 candidate keys

Where it sits on the line

Puzzles #1–#25: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #2 is highlighted. The line sits at 2^69. #1 · 2^0 #2 · 2^1 #3 · 2^2 #4 · 2^3 #5 · 2^4 #6 · 2^5 #7 · 2^6 #8 · 2^7 #9 · 2^8 #10 · 2^9 #11 · 2^10 #12 · 2^11 #13 · 2^12 #14 · 2^13 #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
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 21 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
1CUNEBjYrCn2y1SdiUMohaKUi4wpP326Lb
mempool.space Blockstream
Known public key
02f9308a019258c31049344f85f89d5229b531c845836f99b08601f113bce036f9
HASH160
7dd65592d0ab2fe0d0257d571abf032cd9db93dc
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
21 → 22 − 1
start0x2
end0x3
Interval size2 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
339085
Evidence
On-chain
Catalog label
1aaRgu
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: 50%

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.

0000000000000000000000000000000000000000000000000000000000000003

Mentioned in the atlas

Where #2 comes up in the room pages. rooms 4 · mentions 4

Myths
Theories
Method
Library

Method

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