Unsolved
Bitcoin puzzle #138
Bitcoin puzzle #138 is unsolved. It holds 13.80 BTC, and its private key is an unknown number between 2137 and 2138−1 — a keyspace of 1.74 × 1041 possible keys. You can search that range with the solver below; it runs in your browser and never sends anything to a server.
Solver — #138
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: 20000000000000000000000000000000000
Puzzle #138 at a glance
- Reward
- 13.8 BTC
- Address
- 1Ab4vzG6wEQBDNQM1B2bvUz4fqXXdFk2WT
- HASH160
- 692a8e583866fc9056f5c61a45969fb9d868a08c
- Range start
- 20000000000000000000000000000000000
- Range end
- 3ffffffffffffffffffffffffffffffffff
- Bit length
- 138-bit
- Keys in range
- 1.74 × 1041 (174224571863520493293247799005065324265472)
- Transactions
- 3
The arithmetic
The range for puzzle #138 contains 1.74 × 1041 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 1..3 × 1021 years. Searching randomly instead of in order does not change that expectation — it only changes which unlucky order you fail in.
Puzzle #138 — common questions
How many private keys does Bitcoin puzzle #138 contain?
Puzzle #138 spans the range 2^137 to 2^138−1, which is exactly 1.74 × 10^41 private keys — twice as many as puzzle #137.
How long would it take to solve Bitcoin puzzle #138?
An eight-core machine running this browser solver at four million keys per second would need about 1..3 × 10^21 years to sweep the whole range. A pooled GPU cluster reaching one trillion keys per second would need about 5..5 × 10^20 years.
How much is Bitcoin puzzle #138 worth?
The address holds 13.8 BTC, roughly $1,079,919 at a reference price of $78,255 per BTC.
Is Bitcoin puzzle #138 solved?
No. #138 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 #138?
From 20000000000000000000000000000000000 to 3ffffffffffffffffffffffffffffffffff in hexadecimal. The address is 1Ab4vzG6wEQBDNQM1B2bvUz4fqXXdFk2WT and its HASH160 is 692a8e583866fc9056f5c61a45969fb9d868a08c.