lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #80

found · spent

8 BTC nominal279 candidate keys

Where it sits on the line

Puzzles #68–#92: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #80 is highlighted. The line sits at 2^69. #68 · 2^67 #69 · 2^68 #70 · 2^35.5 #71 · 2^70 #72 · 2^71 #73 · 2^72 #74 · 2^73 #75 · 2^38 #76 · 2^75 #77 · 2^76 #78 · 2^77 #79 · 2^78 #80 · 2^40.5 #81 · 2^80 #82 · 2^81 #83 · 2^82 #84 · 2^83 #85 · 2^43 #86 · 2^85 #87 · 2^86 #88 · 2^87 #89 · 2^88 #90 · 2^45.5 #91 · 2^90 #92 · 2^91
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 240.5 search steps — below the line (269).

Every puzzle below the line has been found.

Model: kangaroo. The public key has been on chain since 2019, so the square-root shortcut applies: about 2 × 2(N−1)/2 group operations.

How the work is estimated

Record

P2PKH address
1BCf6rHUW6m3iH2ptsvnjgLruAiPQQepLe
mempool.space Blockstream
Known public key
037e1238f7b1ce757df94faa9a2eb261bf0aeb9f84dbf81212104e78931c2a19dc
HASH160
6fe5a36eef0684af0b91f3b6cfc972d68c4f6fab
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
279 → 280 − 1
start0x80000000000000000000
end0xffffffffffffffffffff
Interval size604462909807314587353088 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
580231
Evidence
On-chain
Catalog label
pikachunakapika
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: 82.89%

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.

00000000000000000000000000000000000000000000ea1a5c66dcc11b5ad180

Mentioned in the atlas

Where #80 comes up in the room pages. rooms 1 · mentions 1

Scale

Method

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