Solved
Bitcoin puzzle #63
Bitcoin puzzle #63 has been solved. Its private key is 7cce5efdaccf6808. The address originally held 0.63 BTC, which was swept by whoever found the key first.
Puzzle #63 at a glance
- Total received
- 0.63227327 BTC
- Balance now
- 0.0 BTC
- Address
- 1NpYjtLira16LfGbGwZJ5JbDPh3ai9bjf4
- HASH160
- ef58afb697b094423ce90721fbb19a359ef7c50e
- Range start
- 4000000000000000
- Range end
- 7fffffffffffffff
- Bit length
- 63-bit
- Keys in range
- 4.61 × 1018 (4611686018427387904)
- Transactions
- 10
The solved key
- Private key
- 7cce5efdaccf6808
- Decimal
- 8993229949524469768
- WIF
- KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYv5Z9J7hv7VYYN3XL3Y
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 #63 — common questions
How many private keys does Bitcoin puzzle #63 contain?
Puzzle #63 spans the range 2^62 to 2^63−1, which is exactly 4.61 × 10^18 private keys — twice as many as puzzle #62.
How long would it take to solve Bitcoin puzzle #63?
An eight-core machine running this browser solver at four million keys per second would need about 36,534 years to sweep the whole range. A pooled GPU cluster reaching one trillion keys per second would need about 53 days.
How much is Bitcoin puzzle #63 worth?
The address was swept when it was solved, so there is no claimable reward now. It originally received 0.63227327 BTC.
Is Bitcoin puzzle #63 solved?
Yes. Its private key is 7cce5efdaccf6808 in hexadecimal, or KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYv5Z9J7hv7VYYN3XL3Y in WIF format. The balance was spent once the key became known.
What is the key range for puzzle #63?
From 4000000000000000 to 7fffffffffffffff in hexadecimal. The address is 1NpYjtLira16LfGbGwZJ5JbDPh3ai9bjf4 and its HASH160 is ef58afb697b094423ce90721fbb19a359ef7c50e.