Solved
Bitcoin puzzle #42
Bitcoin puzzle #42 has been solved. Its private key is 2a221c58d8f. The address originally held 0.04 BTC, which was swept by whoever found the key first.
Puzzle #42 at a glance
- Total received
- 0.042 BTC
- Balance now
- 0.0 BTC
- Address
- 1E32GPWgDyeyQac4aJxm9HVoLrrEYPnM4N
- HASH160
- 8efb85f9c5b5db2d55973a04128dc7510075ae23
- Range start
- 20000000000
- Range end
- 3ffffffffff
- Bit length
- 42-bit
- Keys in range
- 2,199,023,255,552 (2199023255552)
- Transactions
- 2
The solved key
- Private key
- 2a221c58d8f
- Decimal
- 2895374552463
- WIF
- KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9zzYEemjCVJ3vo9
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 #42 — common questions
How many private keys does Bitcoin puzzle #42 contain?
Puzzle #42 spans the range 2^41 to 2^42−1, which is exactly 2,199,023,255,552 private keys — twice as many as puzzle #41.
How long would it take to solve Bitcoin puzzle #42?
An eight-core machine running this browser solver at four million keys per second would need about 6 days to sweep the whole range. A pooled GPU cluster reaching one trillion keys per second would need about 2.2 seconds.
How much is Bitcoin puzzle #42 worth?
The address was swept when it was solved, so there is no claimable reward now. It originally received 0.042 BTC.
Is Bitcoin puzzle #42 solved?
Yes. Its private key is 2a221c58d8f in hexadecimal, or KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9zzYEemjCVJ3vo9 in WIF format. The balance was spent once the key became known.
What is the key range for puzzle #42?
From 20000000000 to 3ffffffffff in hexadecimal. The address is 1E32GPWgDyeyQac4aJxm9HVoLrrEYPnM4N and its HASH160 is 8efb85f9c5b5db2d55973a04128dc7510075ae23.