Bitcoin Puzzle record
Bitcoin Puzzle #160
Where it sits on the line
- found
- open · address only
- open · public key on chain
- the line · 269
This puzzle needs about 280.5 search steps — above the line (269).
No puzzle above the line has been found yet.
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
- 02e0a8b039282faf6fe0fd769cfbc4b6b4cf8758ba68220eac420e32b91ddfa673
- HASH160
- e84818e1bf7f699aa6e28ef9edfb582099099292
- Search class
- public-key
- A public key is on record, so the square-root shortcut (kangaroo) works inside the interval. A key on record is not a spend.
- Candidate interval
- 2159 → 2160 − 1
- start0x8000000000000000000000000000000000000000
- end0xffffffffffffffffffffffffffffffffffffffff
- Interval size730750818665451459101842416358141509827966271488 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.
Mentioned in the atlas
Where #160 comes up in the room pages. rooms 11 · mentions 27
- History
-
- 2017-07-11 — Consolidation On-chainTimeline
- 2019-05-16 — 1,000-sat deposits on the leak series On-chainTimeline
- Myths
-
- #160 without a public key is a practical brute-force target. Refuted
- Run kangaroo / BSGS on #71. RefutedCryptography
- Theories
-
- #161–#256 were a mistake Forum statementForum statements
- 2017 consolidation as continued control On-chainOn-chain facts
- FAQ
-
- Why are some puzzles harder than others? MethodThe object
+19 more mentions
- History
-
- 2019-06-01 — Public keys revealed On-chainTimeline
- Theories
-
- A quantum / algorithm canary SpeculationSpeculation
- The 2019 leak was a planned kangaroo experiment SpeculationSpeculation
- What would move these records
- FAQ
-
- Which one should I try? MethodSearch classes
- 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
-
- #160 — width 2159 Method
- #160 Snapshot
- Doubling, not a mild slope Method
- 2019 leak map On-chain
- Challenges
-
- After the 2023-04-16 increase, the nominal reward of #N is? On-chainCatalog unit and the 2019 leak
- What made kangaroo practical on the later every-fifth addresses? On-chainCatalog unit and the 2019 leak
- Sources
-
- 2017-07-11 — Consolidation On-chainChain records
- 2019-05-16 — 1,000-sat deposits On-chainChain records
- 2019-06-01 — public-key reveal On-chainChain records
- Library
-
- Work scale MethodCatalog briefings
- 2019 leak map On-chainCatalog briefings
Method
Kangaroo searches only the window you choose. Being inside the window (containment) and being found by the solver are two separate odds, and finishing a bounded run stays probabilistic.