Bitcoin Puzzle record
Bitcoin Puzzle #120
Where it sits on the line
- found
- open · address only
- open · public key on chain
- the line · 269
This puzzle needs about 260.5 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 estimatedRecord
- Known public key
- 02ceb6cbbcdbdf5ef7150682150f4ce2c6f4807b349827dcdbdd1f2efa885a2630
- HASH160
- 4b46e10a541aeec6be3fac709c256fb7da69308e
- Search class
- historical
- The output has been spent. Dates and labels are catalog attributions, not audited identities.
- Candidate interval
- 2119 → 2120 − 1
- start0x800000000000000000000000000000
- end0xffffffffffffffffffffffffffffff
- Interval size664613997892457936451903530140172288 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
- 778498
- Evidence
- Community report
- Catalog label
- RetiredCoder
- 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: 38.33%
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.
0000000000000000000000000000000000b10f22572c497a836ea187f2e1fc23
Mentioned in the atlas
Where #120 comes up in the room pages. rooms 8 · mentions 9
- History
-
- 2023-02-27 — #120 spent Community report
- Cases
-
- Case #120 — spent before the 0.1 BTC unit On-chain
- What the story adds, and does not establish Community reportCase #120 — spent before the 0.1 BTC unit
- People
-
- RetiredCoder — kangaroo solves, #135 self-attributed (Self-attribution) Self-attributionThe five handles
- Theories
-
- RetiredCoder is the creator SpeculationSpeculation
- Challenges
-
- After the 2023-04-16 increase, the nominal reward of #N is? On-chainCatalog unit and the 2019 leak
- Glossary
-
- UTXO / live balance SnapshotCatalog unit and publication risk
+1 more mentions
- Library
-
- Famous spends On-chainCases and people
Method
Historical record. Method notes for open puzzles live on the method page.