Bitcoin Puzzle record
Bitcoin Puzzle #65
Where it sits on the line
- found
- open · address only
- open · public key on chain
- the line · 269
This puzzle needs about 233 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 estimatedRecord
- Known public key
- 0230210c23b1a047bc9bdbb13448e67deddc108946de6de639bcc75d47c0216b1b
- HASH160
- 52e763a7ddc1aa4fa811578c491c1bc7fd570137
- Search class
- historical
- The output has been spent. Dates and labels are catalog attributions, not audited identities.
- Candidate interval
- 264 → 265 − 1
- start0x10000000000000000
- end0x1ffffffffffffffff
- Interval size18446744073709551616 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
- 579693
- Evidence
- On-chain
- Catalog label
- 3GVSoQ
- 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: 65.71%
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.
000000000000000000000000000000000000000000000001a838b13505b26867
Mentioned in the atlas
Where #65 comes up in the room pages. rooms 8 · mentions 12
- History
-
- 2019-05-16 — 1,000-sat deposits on the leak series On-chainTimeline
- 2019-06-01 — Public keys revealed On-chainTimeline
- Theories
-
- The 2019 leak was a planned kangaroo experiment SpeculationSpeculation
- FAQ
-
- What does known public key mean? On-chainSearch classes
- Method
-
- 03 — A legacy spend puts P in scriptSig On-chainHow a P2PKH spend can publish the public key
- Scale
-
- #65 On-chain
- 2019 leak map On-chain
- Challenges
-
- Given a known compressed public key for #140, which method applies? MethodWhich work, which unit
+4 more mentions
- Challenges
-
- What made kangaroo practical on the later every-fifth addresses? On-chainCatalog unit and the 2019 leak
- Sources
-
- 2019-05-16 — 1,000-sat deposits On-chainChain records
- 2019-06-01 — public-key reveal On-chainChain records
- Library
-
- 2019 leak map On-chainCatalog briefings
Method
Historical record. Method notes for open puzzles live on the method page.