Unsolved
Bitcoin puzzle #126
Bitcoin puzzle #126 is unsolved. It holds 12.60 BTC, and its private key is an unknown number between 2125 and 2126−1 — a keyspace of 4.25 × 1037 possible keys. You can search that range with the solver below; it runs in your browser and never sends anything to a server.
Solver — #126
IdleJump to a random point in the range, sweep a block of keys, jump again. Best when many people search the same puzzle.
Each thread is one Web Worker on one core. Leaving a core free keeps the page responsive.
Walk the range in order from your start key up to the end of the range, splitting that region evenly across threads. Keys below the start key are not searched. Best when you are coordinating a systematic sweep.
Range covered: 0%
· Current key: 20000000000000000000000000000000
Puzzle #126 at a glance
- Reward
- 12.6 BTC
- Address
- 1AWCLZAjKbV1P7AHvaPNCKiB7ZWVDMxFiz
- HASH160
- 683ea8a1ef06eada90556017d44323b5c04e00f1
- Range start
- 20000000000000000000000000000000
- Range end
- 3fffffffffffffffffffffffffffffff
- Bit length
- 126-bit
- Keys in range
- 4.25 × 1037 (42535295865117307932921825928971026432)
- Transactions
- 3
The arithmetic
The range for puzzle #126 contains 4.25 × 1037 private keys. A modern eight-core laptop running this solver checks on the order of four million keys per second, so an exhaustive sweep would take about 3..3 × 1021 years. Searching randomly instead of in order does not change that expectation — it only changes which unlucky order you fail in.
Puzzle #126 — common questions
How many private keys does Bitcoin puzzle #126 contain?
Puzzle #126 spans the range 2^125 to 2^126−1, which is exactly 4.25 × 10^37 private keys — twice as many as puzzle #125.
How long would it take to solve Bitcoin puzzle #126?
An eight-core machine running this browser solver at four million keys per second would need about 3..3 × 10^21 years to sweep the whole range. A pooled GPU cluster reaching one trillion keys per second would need about 1.34 × 10^18 years.
How much is Bitcoin puzzle #126 worth?
The address holds 12.6 BTC, roughly $986,013 at a reference price of $78,255 per BTC.
Is Bitcoin puzzle #126 solved?
No. #126 is one of the 78 unsolved puzzles. Its public key has never been exposed, so square-root methods like Pollard's Kangaroo do not apply — brute force over the range is the only option.
What is the key range for puzzle #126?
From 20000000000000000000000000000000 to 3fffffffffffffffffffffffffffffff in hexadecimal. The address is 1AWCLZAjKbV1P7AHvaPNCKiB7ZWVDMxFiz and its HASH160 is 683ea8a1ef06eada90556017d44323b5c04e00f1.