What does this mean to me?
While this attack is happening, you cannot trust bitcoin transaction numbers as much as you might be used to. Once you send a transaction, you need to understand that your transaction might actually get into a block under a different hash. Your recipient gets the funds the same, miner fees are the same, and most block explorers do not show enough detail to be able to tell the two transactions apart.
Technically, your original bitcoin exchange transaction could be considered a “double spend” and let’s hope no-one is foolish enough to confuse your intentions. There is nothing you can do to prevent these modifications. The
modification happens after it is sent onto the public network.
Read More @ http://blog.coinkite.com/post/130318407326/ongoing-bitcoin-malleability-attack-low-s-high
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