I did a research for past 48hours and it seems like that everybody who is running some bitcoin operation with off-chain 0 confirmations instant transactions (and is using txid for verification) like exchanges ( maybe Havelock(!) ) is vulnerable to malleability attack.
+1 for this
IMHO a lot of vendors, exchanges etc just haven't been doing house keeping. Once Gox spread the news malleability has become a new source of exploit for the kiddyscriptors as well as a convenient excuse for scam artists.
yes, i admit the negativity and conspiracy thinking in my recent posts ... but i hardly find something what makes me think different in bitcoin world in recent months, sorry about that. I am just careful.
Careful is fine but if you only carry a hammer everything looks like a nail.
Another way of interpreting Danny's message is that Neo is (thank the heavens) more professional and conscientious than the operators of some of the exchanges and vendors in BTCland. (yes, Karpeles I'm looking at you)
BTC is a world changing protocol much like html was...but it is still in beta really and the infrastructure surrounding it needs to be improved significantly. My hope is that Neo will be one of those improvements.