lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #64

found · spent

6.4 BTC nominal263 candidate keys

Where it sits on the line

Puzzles #52–#76: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #64 is highlighted. The line sits at 2^69. #52 · 2^51 #53 · 2^52 #54 · 2^53 #55 · 2^54 #56 · 2^55 #57 · 2^56 #58 · 2^57 #59 · 2^58 #60 · 2^59 #61 · 2^60 #62 · 2^61 #63 · 2^62 #64 · 2^63 #65 · 2^33 #66 · 2^65 #67 · 2^66 #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
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 263 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
16jY7qLJnxb7CHZyqBP8qca9d51gAjyXQN
mempool.space Blockstream
Known public key
03100611c54dfef604163b8358f7b7fac13ce478e02cb224ae16d45526b25d9d4d
HASH160
3ee4133d991f52fdf6a25c9834e0745ac74248a4
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
263 → 264 − 1
start0x8000000000000000
end0xffffffffffffffff
Interval size9223372036854775808 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
753369
Evidence
On-chain
Catalog label
36X5Cc
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: 92.98%

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.

000000000000000000000000000000000000000000000000f7051f27b09112d4

Method

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