Solved
Bitcoin puzzle #65
Bitcoin puzzle #65 has been solved. Its private key is 1a838b13505b26867. The address originally held 0.65 BTC, which was swept by whoever found the key first.
Puzzle #65 at a glance
- Total received
- 0.65015705 BTC
- Balance now
- 0.0 BTC
- Address
- 18ZMbwUFLMHoZBbfpCjUJQTCMCbktshgpe
- HASH160
- 52e763a7ddc1aa4fa811578c491c1bc7fd570137
- Range start
- 10000000000000000
- Range end
- 1ffffffffffffffff
- Bit length
- 65-bit
- Keys in range
- 1.84 × 1019 (18446744073709551616)
- Transactions
- 11
The solved key
- Private key
- 1a838b13505b26867
- Decimal
- 30568377312064202855
- WIF
- KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qZM21gaY8WN2CdwnTG57
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 #65 — common questions
How many private keys does Bitcoin puzzle #65 contain?
Puzzle #65 spans the range 2^64 to 2^65−1, which is exactly 1.84 × 10^19 private keys — twice as many as puzzle #64.
How long would it take to solve Bitcoin puzzle #65?
An eight-core machine running this browser solver at four million keys per second would need about 146,136 years to sweep the whole range. A pooled GPU cluster reaching one trillion keys per second would need about 214 days.
How much is Bitcoin puzzle #65 worth?
The address was swept when it was solved, so there is no claimable reward now. It originally received 0.65015705 BTC.
Is Bitcoin puzzle #65 solved?
Yes. Its private key is 1a838b13505b26867 in hexadecimal, or KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qZM21gaY8WN2CdwnTG57 in WIF format. The balance was spent once the key became known.
What is the key range for puzzle #65?
From 10000000000000000 to 1ffffffffffffffff in hexadecimal. The address is 18ZMbwUFLMHoZBbfpCjUJQTCMCbktshgpe and its HASH160 is 52e763a7ddc1aa4fa811578c491c1bc7fd570137.