lotterypuzzle atlas

The 2015 Bitcoin Puzzle2 Oct 2026

Everything under the line has been found.

In 2015 someone hid 160 bitcoin keys, each in a range twice as wide as the one before. The puzzle is often called the ~1000 BTC Bitcoin Challenge. 83 have been found. Every key still locked needs more than about 269 search steps.

Search work for all 160 puzzles One column per puzzle; height is the base-2 logarithm of the search work. All 83 found puzzles sit below 2^69; all 77 open puzzles sit above it. #1 · found · 2^0 #2 · found · 2^1 #3 · found · 2^2 #4 · found · 2^3 #5 · found · 2^4 #6 · found · 2^5 #7 · found · 2^6 #8 · found · 2^7 #9 · found · 2^8 #10 · found · 2^9 #11 · found · 2^10 #12 · found · 2^11 #13 · found · 2^12 #14 · found · 2^13 #15 · found · 2^14 #16 · found · 2^15 #17 · found · 2^16 #18 · found · 2^17 #19 · found · 2^18 #20 · found · 2^19 #21 · found · 2^20 #22 · found · 2^21 #23 · found · 2^22 #24 · found · 2^23 #25 · found · 2^24 #26 · found · 2^25 #27 · found · 2^26 #28 · found · 2^27 #29 · found · 2^28 #30 · found · 2^29 #31 · found · 2^30 #32 · found · 2^31 #33 · found · 2^32 #34 · found · 2^33 #35 · found · 2^34 #36 · found · 2^35 #37 · found · 2^36 #38 · found · 2^37 #39 · found · 2^38 #40 · found · 2^39 #41 · found · 2^40 #42 · found · 2^41 #43 · found · 2^42 #44 · found · 2^43 #45 · found · 2^44 #46 · found · 2^45 #47 · found · 2^46 #48 · found · 2^47 #49 · found · 2^48 #50 · found · 2^49 #51 · found · 2^50 #52 · found · 2^51 #53 · found · 2^52 #54 · found · 2^53 #55 · found · 2^54 #56 · found · 2^55 #57 · found · 2^56 #58 · found · 2^57 #59 · found · 2^58 #60 · found · 2^59 #61 · found · 2^60 #62 · found · 2^61 #63 · found · 2^62 #64 · found · 2^63 #65 · found · 2^33 #66 · found · 2^65 #67 · found · 2^66 #68 · found · 2^67 #69 · found · 2^68 #70 · found · 2^35.5 #71 · open · address only · 2^70 #72 · open · address only · 2^71 #73 · open · address only · 2^72 #74 · open · address only · 2^73 #75 · found · 2^38 #76 · open · address only · 2^75 #77 · open · address only · 2^76 #78 · open · address only · 2^77 #79 · open · address only · 2^78 #80 · found · 2^40.5 #81 · open · address only · 2^80 #82 · open · address only · 2^81 #83 · open · address only · 2^82 #84 · open · address only · 2^83 #85 · found · 2^43 #86 · open · address only · 2^85 #87 · open · address only · 2^86 #88 · open · address only · 2^87 #89 · open · address only · 2^88 #90 · found · 2^45.5 #91 · open · address only · 2^90 #92 · open · address only · 2^91 #93 · open · address only · 2^92 #94 · open · address only · 2^93 #95 · found · 2^48 #96 · open · address only · 2^95 #97 · open · address only · 2^96 #98 · open · address only · 2^97 #99 · open · address only · 2^98 #100 · found · 2^50.5 #101 · open · address only · 2^100 #102 · open · address only · 2^101 #103 · open · address only · 2^102 #104 · open · address only · 2^103 #105 · found · 2^53 #106 · open · address only · 2^105 #107 · open · address only · 2^106 #108 · open · address only · 2^107 #109 · open · address only · 2^108 #110 · found · 2^55.5 #111 · open · address only · 2^110 #112 · open · address only · 2^111 #113 · open · address only · 2^112 #114 · open · address only · 2^113 #115 · found · 2^58 #116 · open · address only · 2^115 #117 · open · address only · 2^116 #118 · open · address only · 2^117 #119 · open · address only · 2^118 #120 · found · 2^60.5 #121 · open · address only · 2^120 #122 · open · address only · 2^121 #123 · open · address only · 2^122 #124 · open · address only · 2^123 #125 · found · 2^63 #126 · open · address only · 2^125 #127 · open · address only · 2^126 #128 · open · address only · 2^127 #129 · open · address only · 2^128 #130 · found · 2^65.5 #131 · open · address only · 2^130 #132 · open · address only · 2^131 #133 · open · address only · 2^132 #134 · open · address only · 2^133 #135 · found · 2^68 #136 · open · address only · 2^135 #137 · open · address only · 2^136 #138 · open · address only · 2^137 #139 · open · address only · 2^138 #140 · open · public key on chain · 2^70.5 #141 · open · address only · 2^140 #142 · open · address only · 2^141 #143 · open · address only · 2^142 #144 · open · address only · 2^143 #145 · open · public key on chain · 2^73 #146 · open · address only · 2^145 #147 · open · address only · 2^146 #148 · open · address only · 2^147 #149 · open · address only · 2^148 #150 · open · public key on chain · 2^75.5 #151 · open · address only · 2^150 #152 · open · address only · 2^151 #153 · open · address only · 2^152 #154 · open · address only · 2^153 #155 · open · public key on chain · 2^78 #156 · open · address only · 2^155 #157 · open · address only · 2^156 #158 · open · address only · 2^157 #159 · open · address only · 2^158 #160 · open · public key on chain · 2^80.5 Search work for all 160 puzzles One column per puzzle; height is the base-2 logarithm of the search work. All 83 found puzzles sit below 2^69; all 77 open puzzles sit above it. #1 · found · 2^0 #2 · found · 2^1 #3 · found · 2^2 #4 · found · 2^3 #5 · found · 2^4 #6 · found · 2^5 #7 · found · 2^6 #8 · found · 2^7 #9 · found · 2^8 #10 · found · 2^9 #11 · found · 2^10 #12 · found · 2^11 #13 · found · 2^12 #14 · found · 2^13 #15 · found · 2^14 #16 · found · 2^15 #17 · found · 2^16 #18 · found · 2^17 #19 · found · 2^18 #20 · found · 2^19 #21 · found · 2^20 #22 · found · 2^21 #23 · found · 2^22 #24 · found · 2^23 #25 · found · 2^24 #26 · found · 2^25 #27 · found · 2^26 #28 · found · 2^27 #29 · found · 2^28 #30 · found · 2^29 #31 · found · 2^30 #32 · found · 2^31 #33 · found · 2^32 #34 · found · 2^33 #35 · found · 2^34 #36 · found · 2^35 #37 · found · 2^36 #38 · found · 2^37 #39 · found · 2^38 #40 · found · 2^39 #41 · found · 2^40 #42 · found · 2^41 #43 · found · 2^42 #44 · found · 2^43 #45 · found · 2^44 #46 · found · 2^45 #47 · found · 2^46 #48 · found · 2^47 #49 · found · 2^48 #50 · found · 2^49 #51 · found · 2^50 #52 · found · 2^51 #53 · found · 2^52 #54 · found · 2^53 #55 · found · 2^54 #56 · found · 2^55 #57 · found · 2^56 #58 · found · 2^57 #59 · found · 2^58 #60 · found · 2^59 #61 · found · 2^60 #62 · found · 2^61 #63 · found · 2^62 #64 · found · 2^63 #65 · found · 2^33 #66 · found · 2^65 #67 · found · 2^66 #68 · found · 2^67 #69 · found · 2^68 #70 · found · 2^35.5 #71 · open · address only · 2^70 #72 · open · address only · 2^71 #73 · open · address only · 2^72 #74 · open · address only · 2^73 #75 · found · 2^38 #76 · open · address only · 2^75 #77 · open · address only · 2^76 #78 · open · address only · 2^77 #79 · open · address only · 2^78 #80 · found · 2^40.5 #81 · open · address only · 2^80 #82 · open · address only · 2^81 #83 · open · address only · 2^82 #84 · open · address only · 2^83 #85 · found · 2^43 #86 · open · address only · 2^85 #87 · open · address only · 2^86 #88 · open · address only · 2^87 #89 · open · address only · 2^88 #90 · found · 2^45.5 #91 · open · address only · 2^90 #92 · open · address only · 2^91 #93 · open · address only · 2^92 #94 · open · address only · 2^93 #95 · found · 2^48 #96 · open · address only · 2^95 #97 · open · address only · 2^96 #98 · open · address only · 2^97 #99 · open · address only · 2^98 #100 · found · 2^50.5 #101 · open · address only · 2^100 #102 · open · address only · 2^101 #103 · open · address only · 2^102 #104 · open · address only · 2^103 #105 · found · 2^53 #106 · open · address only · 2^105 #107 · open · address only · 2^106 #108 · open · address only · 2^107 #109 · open · address only · 2^108 #110 · found · 2^55.5 #111 · open · address only · 2^110 #112 · open · address only · 2^111 #113 · open · address only · 2^112 #114 · open · address only · 2^113 #115 · found · 2^58 #116 · open · address only · 2^115 #117 · open · address only · 2^116 #118 · open · address only · 2^117 #119 · open · address only · 2^118 #120 · found · 2^60.5 #121 · open · address only · 2^120 #122 · open · address only · 2^121 #123 · open · address only · 2^122 #124 · open · address only · 2^123 #125 · found · 2^63 #126 · open · address only · 2^125 #127 · open · address only · 2^126 #128 · open · address only · 2^127 #129 · open · address only · 2^128 #130 · found · 2^65.5 #131 · open · address only · 2^130 #132 · open · address only · 2^131 #133 · open · address only · 2^132 #134 · open · address only · 2^133 #135 · found · 2^68 #136 · open · address only · 2^135 #137 · open · address only · 2^136 #138 · open · address only · 2^137 #139 · open · address only · 2^138 #140 · open · public key on chain · 2^70.5 #141 · open · address only · 2^140 #142 · open · address only · 2^141 #143 · open · address only · 2^142 #144 · open · address only · 2^143 #145 · open · public key on chain · 2^73 #146 · open · address only · 2^145 #147 · open · address only · 2^146 #148 · open · address only · 2^147 #149 · open · address only · 2^148 #150 · open · public key on chain · 2^75.5 #151 · open · address only · 2^150 #152 · open · address only · 2^151 #153 · open · address only · 2^152 #154 · open · address only · 2^153 #155 · open · public key on chain · 2^78 #156 · open · address only · 2^155 #157 · open · address only · 2^156 #158 · open · address only · 2^157 #159 · open · address only · 2^158 #160 · open · public key on chain · 2^80.5
  • found 83
  • open · address only 72
  • open · public key on chain 5

Point at a column to read it.

How the work is estimated
still locked
77/160
BTC in catalog rewards
903
public keys on chain
5
last found
#13528 Jul 2026

Snapshot 2 Oct 2026. Rewards are the catalog's nominal allocations, not live balances.

The puzzle in four facts

In order, from the funding to today.

  1. 2015

    One transaction funded it

    In January 2015 a single transaction funded the puzzle addresses; the catalog lists 160. Address N hides a key between 2N−1 and 2N − 1.

    Four consecutive puzzles: each range twice as wide as the last
    See the genesis transaction →

  2. The doubling

    Every step doubles the work

    Each puzzle has twice as many candidate keys as the one before, so the work grows exponentially. Everything found sits below about 269 search steps.

    How the work is estimated →

  3. 2019

    Some public keys came out

    In June 2019 a spend revealed the public key of every fifth address from #65 on. A public key allows the square-root shortcut (kangaroo), which is why #135 was found before #71.

    See the 2019 transaction →

  4. 2023 and today

    Rewards rose tenfold

    Since April 2023 each puzzle's nominal reward is N × 0.1 BTC. The 903 BTC still open is a catalog sum, not a live balance, and for almost everyone a hunt has negative expected value.

    Try the expected-value calculator →

Two doors, same height

The cheapest open target of each kind. Different methods, about the same work.

Address only

#71

Scan the range

270 keys

No public key. Every candidate key is hashed and compared with the address.

1PWo3JeB9jrGwfHDNpdGK54CRas7fsVzXU

7.1 BTCOpen record →

Public key on chain

#140

Kangaroo

≈ 270.5 group operations

The public key was revealed in 2019, so the square-root shortcut applies.

1QKBaU6WAeycb3DbKbLBkX7vJiaS8r42Xo

14 BTCOpen record →

Latest finds

Most recent spends in the catalog, newest first. Names are labels, not audited identities.

All spent puzzles →
  1. #135 28 Jul 2026 kangaroo · 268 RetiredCoder (self-attributed)
  2. #69 30 Apr 2025 range scan · 268 unattributed
  3. #68 6 Apr 2025 range scan · 267 Kowala
  4. #67 21 Feb 2025 range scan · 266 Kowala
  5. #130 23 Sep 2024 kangaroo · 265.5 RetiredCoder
  6. #66 12 Sep 2024 range scan · 265 unattributed

Read the atlas