lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #85

found · spent

8.5 BTC nominal284 candidate keys

Where it sits on the line

Puzzles #73–#97: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #85 is highlighted. The line sits at 2^69. #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 #93 · 2^92 #94 · 2^93 #95 · 2^48 #96 · 2^95 #97 · 2^96
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 243 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
1Kh22PvXERd2xpTQk3ur6pPEqFeckCJfAr
mempool.space Blockstream
Known public key
0329c4574a4fd8c810b7e42a4b398882b381bcd85e40c6883712912d167c83e73a
HASH160
cd03c1e6268ce9b89e3c3eeab8d0f1b6e8cac281
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
284 → 285 − 1
start0x1000000000000000000000
end0x1fffffffffffffffffffff
Interval size19342813113834066795298816 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
581047
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: 9.03%

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.

00000000000000000000000000000000000000000011720c4f018d51b8cebba8

Mentioned in the atlas

Where #85 comes up in the room pages. rooms 1 · mentions 1

Scale

Method

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