A federal appeals court on Wednesday refused to provide a rehearing of a conviction and life imprisonment sentence for Ross Ulbricht, founder of the online Silk Road marketplace that allowed users to discreetly buy illicit goods and services.

The 2nd Circuit Court of Appeals this week rejected Ulbricht's petition for a panel or full rehearing of his case, after a panel of the northeastern appeals court declined an appeal from Ulbricht earlier this year.

Ulbricht was convicted by a jury in February 2015 because of his creation and operation of what the 2nd Circuit Court later identified as a "massive, anonymous criminal marketplace."

What, if any, legal action Ulbricht may pursue next remains unknown, but the Silk Road founder's next avenue could be a petition to the Supreme Court.