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Bitstamp is in the process of rewriting their entire system from the ground up, to prevent this sort of thing happening again.
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AFAIK, they are doing something more modest: rebuilding the system. I.e. installing and configuring all their software on their new server. That's why they are going to complete the task in a day or two. Rewriting the whole system would have taken several months. Although it may be a good thing to do Bitstamp is in the process of rewriting their entire system from the ground up, to prevent this sort of thing happening again.
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