From the Forbes article: "So this was not merely a distributed denial of service attack? It was a zero day exploit? Did it gain access to any data or simply knock the site offline?

I’m not one hundred percent on this, but I don’t think it’s possible to do a DDoS over Tor, or at least it is much harder than doing it over the clear net. The effect of the attack was to block access to Silk Road. No data was leaked, in fact we’ve never had a data leak. "

Posted after the feds imaged the server. OOOPS. Hubris is dangerous.