Solved
Bitcoin puzzle #61
Bitcoin puzzle #61 has been solved. Its private key is 13c96a3742f64906. The address originally held 0.61 BTC, which was swept by whoever found the key first.
Puzzle #61 at a glance
- Total received
- 0.61000793 BTC
- Balance now
- 0.0 BTC
- Address
- 1AVJKwzs9AskraJLGHAZPiaZcrpDr1U6AB
- HASH160
- 68133e19b2dfb9034edf9830a200cfdf38c90cbd
- Range start
- 1000000000000000
- Range end
- 1fffffffffffffff
- Bit length
- 61-bit
- Keys in range
- 1.15 × 1018 (1152921504606846976)
- Transactions
- 5
The solved key
- Private key
- 13c96a3742f64906
- Decimal
- 1425787542618654982
- WIF
- KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYmLDHsih379uP9zbHSD
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 #61 — common questions
How many private keys does Bitcoin puzzle #61 contain?
Puzzle #61 spans the range 2^60 to 2^61−1, which is exactly 1.15 × 10^18 private keys — twice as many as puzzle #60.
How long would it take to solve Bitcoin puzzle #61?
An eight-core machine running this browser solver at four million keys per second would need about 9,133 years to sweep the whole range. A pooled GPU cluster reaching one trillion keys per second would need about 13 days.
How much is Bitcoin puzzle #61 worth?
The address was swept when it was solved, so there is no claimable reward now. It originally received 0.61000793 BTC.
Is Bitcoin puzzle #61 solved?
Yes. Its private key is 13c96a3742f64906 in hexadecimal, or KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYmLDHsih379uP9zbHSD in WIF format. The balance was spent once the key became known.
What is the key range for puzzle #61?
From 1000000000000000 to 1fffffffffffffff in hexadecimal. The address is 1AVJKwzs9AskraJLGHAZPiaZcrpDr1U6AB and its HASH160 is 68133e19b2dfb9034edf9830a200cfdf38c90cbd.