lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #21

found · spent

2.1 BTC nominal220 candidate keys

Where it sits on the line

Puzzles #9–#33: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #21 is highlighted. The line sits at 2^69. #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 #26 · 2^25 #27 · 2^26 #28 · 2^27 #29 · 2^28 #30 · 2^29 #31 · 2^30 #32 · 2^31 #33 · 2^32
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 220 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
14oFNXucftsHiUMY8uctg6N487riuyXs4h
mempool.space Blockstream
Known public key
031a746c78f72754e0be046186df8a20cdce5c79b2eda76013c647af08d306e49e
HASH160
29a78213caa9eea824acf08022ab9dfc83414f56
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
220 → 221 − 1
start0x100000
end0x1fffff
Interval size1048576 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
339090
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: 72.78%

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.

00000000000000000000000000000000000000000000000000000000001ba534

Method

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