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The current status as of the time I write this is: There are no known attacks on second pre-images for truncated SHA-256 that are faster than brute force.


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There are a number of known attacks that can occur right at the point of block formation. The most recent one, transaction malleability, wasn't really the reason for Mt Gox's demise, but it surely created some problems (and for the most part has been fixed). Unfortunately there is a theoretical, but pretty convincing theory, about what has been called cartel ...



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