Silk Road and Ulbricht were among the most popular online crime figures in Internet history. Ars reported on Wednesday that a mysterious hacker identified as Individual X transferred close to $1 billion in bitcoin out of a wallet likely associated with the Silk Road crime. The seizure came two days after blockchain analysts noticed the unusual activity. The unknown hacker didn’t return or spend the bitcoin. Instead, Individual X on Tuesday signed a Consent and Agreement to Forfeiture with the US Attorney’s office in San Francisco agreeing to turn over the funds to the government.