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> According to the criminal complaint, Ulbricht posted the question using his own real name. Less than one minute later, he changed his username to “frosty.”

How was it know then? Did they record the traffic and see it there? Did SO tell them?

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I'd imaging they began with the 'frosty' name, which led to SO, which lead to a subpoena, which got them logs and the name.

They may have subpoena'd SE for all records on all users asking for questions relating to managing Tor hidden services.

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