Solved
Bitcoin puzzle #21
Bitcoin puzzle #21 has been solved. Its private key is 1ba534. The address originally held 0.02 BTC, which was swept by whoever found the key first.
Puzzle #21 at a glance
- Total received
- 0.02201813 BTC
- Balance now
- 0.0 BTC
- Address
- 14oFNXucftsHiUMY8uctg6N487riuyXs4h
- HASH160
- 29a78213caa9eea824acf08022ab9dfc83414f56
- Range start
- 100000
- Range end
- 1fffff
- Bit length
- 21-bit
- Keys in range
- 1,048,576 (1048576)
- Transactions
- 8
The solved key
- Private key
- 1ba534
- Decimal
- 1811764
- WIF
- KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M7rL6JJvw6XUry
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 #21 — common questions
How many private keys does Bitcoin puzzle #21 contain?
Puzzle #21 spans the range 2^20 to 2^21−1, which is exactly 1,048,576 private keys — twice as many as puzzle #20.
How long would it take to solve Bitcoin puzzle #21?
An eight-core machine running this browser solver at four million keys per second would need about < 1 seconds to sweep the whole range. A pooled GPU cluster reaching one trillion keys per second would need about < 1 seconds.
How much is Bitcoin puzzle #21 worth?
The address was swept when it was solved, so there is no claimable reward now. It originally received 0.02201813 BTC.
Is Bitcoin puzzle #21 solved?
Yes. Its private key is 1ba534 in hexadecimal, or KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M7rL6JJvw6XUry in WIF format. The balance was spent once the key became known.
What is the key range for puzzle #21?
From 100000 to 1fffff in hexadecimal. The address is 14oFNXucftsHiUMY8uctg6N487riuyXs4h and its HASH160 is 29a78213caa9eea824acf08022ab9dfc83414f56.