Their history of oddly-composed transactions could help identify more of their likely addresses, if noone else did the same thing, but that would still be of li

Their history of oddly-composed transactions could help identify more of their likely addresses, if noone else did the same thing, but that would still be of limited use in funds-tracing depending on whether such addresses were ever reused. That they've long been issuing valid but unusual signatures was mentioned among other places at: http://www.reddit.com/r/Bitcoin/comments/1x93tf/some_irc_chatter_about_what_is_going_on_at_mtgox/cf99yac http://www.reddit.com/r/Bitcoin/comments/1x93tf/some_irc_cha... I'm not sure if this was just a tiny sliver of their transactions, or a large proportion... but it complicates easy analysis of what the malleability losses could be.