Would be great if someone could find out who did this transaction.
We know that the funds came from this address:
https://blockchain.info/address/173ujrhEVGqaZvPHXLqwXiSmPVMo225cqTIt's quite a big player, with transactions every day.
Is this an exchange?
Like someone was saying here before, the guy that holds those 256 addresses has now some power over us, if suddenly we see that the addresses from 50 to 256 are spent, we will all feel a bit scared, no?

We wouldn't know if they were actually cracked (and this would raise some questions) or if it was an intentional transaction from the holder...