Solved
Bitcoin puzzle #28
Bitcoin puzzle #28 has been solved. Its private key is d916ce8. The address originally held 0.03 BTC, which was swept by whoever found the key first.
Puzzle #28 at a glance
- Total received
- 0.028 BTC
- Balance now
- 0.0 BTC
- Address
- 12jbtzBb54r97TCwW3G1gCFoumpckRAPdY
- HASH160
- 1306b9e4ff56513a476841bac7ba48d69516b1da
- Range start
- 8000000
- Range end
- fffffff
- Bit length
- 28-bit
- Keys in range
- 134,217,728 (134217728)
- Transactions
- 2
The solved key
- Private key
- d916ce8
- Decimal
- 227634408
- WIF
- KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M82GSgY8p5EkUe
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 #28 — common questions
How many private keys does Bitcoin puzzle #28 contain?
Puzzle #28 spans the range 2^27 to 2^28−1, which is exactly 134,217,728 private keys — twice as many as puzzle #27.
How long would it take to solve Bitcoin puzzle #28?
An eight-core machine running this browser solver at four million keys per second would need about 33.6 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 #28 worth?
The address was swept when it was solved, so there is no claimable reward now. It originally received 0.028 BTC.
Is Bitcoin puzzle #28 solved?
Yes. Its private key is d916ce8 in hexadecimal, or KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M82GSgY8p5EkUe in WIF format. The balance was spent once the key became known.
What is the key range for puzzle #28?
From 8000000 to fffffff in hexadecimal. The address is 12jbtzBb54r97TCwW3G1gCFoumpckRAPdY and its HASH160 is 1306b9e4ff56513a476841bac7ba48d69516b1da.