lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #121

open · address only

12.1 BTC nominal2120 candidate keys

Where it sits on the line

Puzzles #109–#133: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #121 is highlighted. The line sits at 2^69. #109 · 2^108 #110 · 2^55.5 #111 · 2^110 #112 · 2^111 #113 · 2^112 #114 · 2^113 #115 · 2^58 #116 · 2^115 #117 · 2^116 #118 · 2^117 #119 · 2^118 #120 · 2^60.5 #121 · 2^120 #122 · 2^121 #123 · 2^122 #124 · 2^123 #125 · 2^63 #126 · 2^125 #127 · 2^126 #128 · 2^127 #129 · 2^128 #130 · 2^65.5 #131 · 2^130 #132 · 2^131 #133 · 2^132
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 2120 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
1GDSuiThEV64c166LUFC9uDcVdGjqkxKyh
mempool.space Blockstream
HASH160
a6e4818537e42f7b3f021daa810367dad4dda16f
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
2120 → 2121 − 1
start0x1000000000000000000000000000000
end0x1ffffffffffffffffffffffffffffff
Interval size1329227995784915872903807060280344576 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.