http://arxiv.org/abs/1403.6676
Y más interesante conclusión:
6 Conclusion
The transaction malleability problem is real and should be considered when im-
plementing Bitcoin clients. However, while MtGox claimed to have lost 850,000
bitcoins due to malleability attacks, we merely observed a total of 302,000 bit-
coins ever being involved in malleability attacks. Of these, only 1,811 bitcoins
were in attacks before MtGox stopped users from withdrawing bitcoins. Even
more, 78.64% of these attacks were ineffective. As such, barely 386 bitcoins
could have been stolen using malleability attacks from MtGox or from other
businesses. Even if all of these attacks were targeted against MtGox, MtGox
needs to explain the whereabouts of 849,600 bitcoins.