When 64bit key space is brute forced offline, it doesn't matter which type of darkNXT it is. All of them will be cracked wide open. Even if someone has a key for a darkNXT acct, if the brute force robot cracks the 64bit code first, it will obtain control of the acct and lock out the original funder of the acct.

People who think they are being safer by never going online are doing the exact opposite. We really need to tell people about this. Currently tens of millions of dollars is up for grabs. My understanding is that bitcoin terahash asics can do part of the offline decoding, but the curve25... doesn't have any asics yet, so it will be a very long time before 64 bit space is cracked. However, if NXT price goes up significantly, specialized NXT miner asics won't be too far behind

James

P.S. My guess is that a lot of the 250 million(!) darkNXT is founder or large early adopter NXT put into  "savings" accts, without realizing (or caring) about the "weak" 64 bit security