Solved
Bitcoin puzzle #18
Bitcoin puzzle #18 has been solved. Its private key is 3080d. The address originally held 0.02 BTC, which was swept by whoever found the key first.
Puzzle #18 at a glance
- Total received
- 0.018 BTC
- Balance now
- 0.0 BTC
- Address
- 1GnNTmTVLZiqQfLbAdp9DVdicEnB5GoERE
- HASH160
- ad1e852b08eba53df306ec9daa8c643426953f94
- Range start
- 20000
- Range end
- 3ffff
- Bit length
- 18-bit
- Keys in range
- 131,072 (131072)
- Transactions
- 2
The solved key
- Private key
- 3080d
- Decimal
- 198669
- WIF
- KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M7rFyWkjT5fywW
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 #18 — common questions
How many private keys does Bitcoin puzzle #18 contain?
Puzzle #18 spans the range 2^17 to 2^18−1, which is exactly 131,072 private keys — twice as many as puzzle #17.
How long would it take to solve Bitcoin puzzle #18?
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 #18 worth?
The address was swept when it was solved, so there is no claimable reward now. It originally received 0.018 BTC.
Is Bitcoin puzzle #18 solved?
Yes. Its private key is 3080d in hexadecimal, or KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M7rFyWkjT5fywW in WIF format. The balance was spent once the key became known.
What is the key range for puzzle #18?
From 20000 to 3ffff in hexadecimal. The address is 1GnNTmTVLZiqQfLbAdp9DVdicEnB5GoERE and its HASH160 is ad1e852b08eba53df306ec9daa8c643426953f94.