Puzzle 64 is between --keyspace D450000000000000:D46fffffffffffff Let's see who solve it first..
B*sh*t.
1) How do you know it is between D45...D47, not before D45 and not after D47?
2) You say that because you have found several addresses which starts with 16jY7qLJ, the final address must be somewhere close. Of course not. Address is a result of double hash on public key -> so you say that there is a range of private keys which produces public keys which double(!) hashed produces similar address. Nonsense.
Show me proof that key CANNOT be outside of your range.