There's not that many, this particular one has been known for some time. Most seem to be legacy issues (OP_RETURN used to return true when it should be false) o

There's not that many, this particular one has been known for some time. Most seem to be legacy issues (OP_RETURN used to return true when it should be false) or quite reasonable misunderstandings (the lock limit for the BIP50 chain fork was tested, but not fully). http://en.bitcoin.it/wiki/Transaction_Malleability http://en.bitcoin.it/wiki/Transaction_Malleability