lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #18

found · spent

1.8 BTC nominal217 candidate keys

Where it sits on the line

Puzzles #6–#30: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #18 is highlighted. The line sits at 2^69. #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 #26 · 2^25 #27 · 2^26 #28 · 2^27 #29 · 2^28 #30 · 2^29
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 217 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
1GnNTmTVLZiqQfLbAdp9DVdicEnB5GoERE
mempool.space Blockstream
Known public key
020ce4a3291b19d2e1a7bf73ee87d30a6bdbc72b20771e7dfff40d0db755cd4af1
HASH160
ad1e852b08eba53df306ec9daa8c643426953f94
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
217 → 218 − 1
start0x20000
end0x3ffff
Interval size131072 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
1Hm4wH
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: 51.57%

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.

000000000000000000000000000000000000000000000000000000000003080d

Method

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