Solved
Bitcoin puzzle #51
Bitcoin puzzle #51 has been solved. Its private key is 75070a1a009d4. The address originally held 0.10 BTC, which was swept by whoever found the key first.
Puzzle #51 at a glance
- Total received
- 0.10171886 BTC
- Balance now
- 0.0 BTC
- Address
- 1NpnQyZ7x24ud82b7WiRNvPm6N8bqGQnaS
- HASH160
- ef6419cffd7fad7027994354eb8efae223c2dbe7
- Range start
- 4000000000000
- Range end
- 7ffffffffffff
- Bit length
- 51-bit
- Keys in range
- 1.12 × 1015 (1125899906842624)
- Transactions
- 3
The solved key
- Private key
- 75070a1a009d4
- Decimal
- 2058769515153876
- WIF
- KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgm9fa43QnU2CpULaK
Verify it yourself: multiply this key by the secp256k1 generator point, compress the resulting public key, and take RIPEMD-160(SHA-256(·)). You get exactly the HASH160 above. This site performs that check on every published key at build time.
Puzzle #51 — common questions
How many private keys does Bitcoin puzzle #51 contain?
Puzzle #51 spans the range 2^50 to 2^51−1, which is exactly 1.12 × 10^15 private keys — twice as many as puzzle #50.
How long would it take to solve Bitcoin puzzle #51?
An eight-core machine running this browser solver at four million keys per second would need about 9 years to sweep the whole range. A pooled GPU cluster reaching one trillion keys per second would need about 19 minutes.
How much is Bitcoin puzzle #51 worth?
The address was swept when it was solved, so there is no claimable reward now. It originally received 0.10171886 BTC.
Is Bitcoin puzzle #51 solved?
Yes. Its private key is 75070a1a009d4 in hexadecimal, or KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgm9fa43QnU2CpULaK in WIF format. The balance was spent once the key became known.
What is the key range for puzzle #51?
From 4000000000000 to 7ffffffffffff in hexadecimal. The address is 1NpnQyZ7x24ud82b7WiRNvPm6N8bqGQnaS and its HASH160 is ef6419cffd7fad7027994354eb8efae223c2dbe7.