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A comment on Bitcoin Exchanges Under ‘Massive and Concerted Attack’. Parent comment

Re:Bitcoin Exchanges Under ‘Massive and Concerted Attack’ by sktrdie on Tuesday February 11, 2014 @01:58PM (#7219557)
Not exactly. The buggy wallet software, used by these exchanges, identifies transactions by their hash. Even if one of the duplicates is confirmed, the buggy wallet still thinks the other is a new transaction, because it has a different hash.

The fix is checking all inputs/outputs rather than relying on the transaction hash.

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Re:Bitcoin Exchanges Under ‘Massive and Concerted Attack’ by pmorici on Tuesday February 11, 2014 @02:04PM (#7219603)
MtGox is the only one using the TXID hash to track unconfirmed transactions. The problem with the other wallets is that if you try and spend a change address from a rewritten transaction before it is confirmed then that transaction involving the change is then invalid.

Edit: Here is a good explanation of what this latest problem is which is different than the problem MtGox is struggling with http://www.reddit.com/r/Bitcoin/comments/1xm49o/due_to_activ...

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Re:Bitcoin Exchanges Under ‘Massive and Concerted Attack’ by nwh on Tuesday February 11, 2014 @02:03PM (#7219590)
You're right, I altered my response to remove the incorrect bit.
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