The most powerful hacker stole $1 billion worth of Bitcoin: He hid it for 7 years without spending it

There is such a hacker who stole $1 billion worth of Bitcoin and did not spend it in the past 7 years...
According to US media reports, the FBI shut down Silk Road in October 2013 and arrested Ulbricht, and will confiscate the 69,370 bitcoins (each worth more than $15,000). These bitcoins once belonged to Silk Road founder Ross Ulbricht, who was sentenced to life imprisonment in 2015.
The document said the seized bitcoins were stolen from Silk Road in 2013 by a hacker identified in court documents only as "Individual X." The stolen bitcoins were worth about $14 million, or just over $200 per bitcoin. But the value of bitcoins has since soared and is now worth nearly $1 billion.
The documents allege that Ulbricht learned of Individual X's online identity and threatened Individual X to return the cryptocurrency shortly after the money was stolen . Instead of returning the cryptocurrency, Individual X kept it and never spent it. On Tuesday, Individual X agreed to the federal government forfeiting the funds, the documents show.