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by qnr 4712 days ago
Well, MtGox monthly volume is over 1 million BTC [1] or $100 million at current prices. I think you should be able to take out at least a few million without raising suspicion

In case of SHA2 compromise in particular, generating, say 20% of daily blocks would hardly be noticed (and can be easily explained as a new shipment of ASICs). This is about 720 BTC or $72000 daily.

[1] http://bitcoincharts.com/markets/mtgoxUSD.html