Re: Don't understand
.Surely there ought to be a mechanism to undo that? At least partially, even if there's no roll-back due to other transactions, shouldn't the receiving wallet(s) be marked as criminal and so blocked, etc, by all miners everywhere?
"
Still not quite understanding myself BUT
I think once it gets another transaction tagged on, then backing up is more problem than anything.
Hence "Maintenance", then 2 days later "Oh look, someone stole them and we cant backtrack"
If Mt GOX had fessed up within minutes / hours, someone would have been able to call "FRAUD" quite quickly