lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #156

open · address only

15.6 BTC nominal2155 candidate keys

Where it sits on the line

Puzzles #136–#160: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #156 is highlighted. The line sits at 2^69. #136 · 2^135 #137 · 2^136 #138 · 2^137 #139 · 2^138 #140 · 2^70.5 #141 · 2^140 #142 · 2^141 #143 · 2^142 #144 · 2^143 #145 · 2^73 #146 · 2^145 #147 · 2^146 #148 · 2^147 #149 · 2^148 #150 · 2^75.5 #151 · 2^150 #152 · 2^151 #153 · 2^152 #154 · 2^153 #155 · 2^78 #156 · 2^155 #157 · 2^156 #158 · 2^157 #159 · 2^158 #160 · 2^80.5
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 2155 search steps — above the line (269).

No puzzle above the line has been found yet.

Model: range scan. Every candidate key in the interval is hashed and compared with the address.

How the work is estimated

Record

P2PKH address
1FTpAbQa4h8trvhQXjXnmNhqdiGBd1oraE
mempool.space Blockstream
HASH160
9ea3f29aaedf7da10b1488934c50a39e271b0b64
Search class
address-only
No public key on record: the only route is to hash candidate keys and compare them with the address (HASH160).
Candidate interval
2155 → 2156 − 1
start0x800000000000000000000000000000000000000
end0xfffffffffffffffffffffffffffffffffffffff
Interval size45671926166590716193865151022383844364247891968 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.

Method

Without a catalogued public key the work is sequential HASH160 comparison across the interval, so it grows with the interval size.