Unsolved
Bitcoin puzzle #101
Bitcoin puzzle #101 is unsolved. It holds 10.10 BTC, and its private key is an unknown number between 2100 and 2101−1 — a keyspace of 1.26 × 1030 possible keys. You can search that range with the solver below; it runs in your browser and never sends anything to a server.
Solver — #101
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: 10000000000000000000000000
Puzzle #101 at a glance
- Reward
- 10.1 BTC
- Address
- 1CKCVdbDJasYmhswB6HKZHEAnNaDpK7W4n
- HASH160
- 7c1a77205c03b9909663b2034faa0b544e6bc96b
- Range start
- 10000000000000000000000000
- Range end
- 1fffffffffffffffffffffffff
- Bit length
- 101-bit
- Keys in range
- 1.26 × 1030 (1267650600228229401496703205376)
- Transactions
- 3
The arithmetic
The range for puzzle #101 contains 1.26 × 1030 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 1.00 × 1016 years. Searching randomly instead of in order does not change that expectation — it only changes which unlucky order you fail in.
Puzzle #101 — common questions
How many private keys does Bitcoin puzzle #101 contain?
Puzzle #101 spans the range 2^100 to 2^101−1, which is exactly 1.26 × 10^30 private keys — twice as many as puzzle #100.
How long would it take to solve Bitcoin puzzle #101?
An eight-core machine running this browser solver at four million keys per second would need about 1.00 × 10^16 years to sweep the whole range. A pooled GPU cluster reaching one trillion keys per second would need about 40.2 billion years.
How much is Bitcoin puzzle #101 worth?
The address holds 10.1 BTC, roughly $790,375 at a reference price of $78,255 per BTC.
Is Bitcoin puzzle #101 solved?
No. #101 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 #101?
From 10000000000000000000000000 to 1fffffffffffffffffffffffff in hexadecimal. The address is 1CKCVdbDJasYmhswB6HKZHEAnNaDpK7W4n and its HASH160 is 7c1a77205c03b9909663b2034faa0b544e6bc96b.