The founder of the former Silk Road online black market, Ross Ulbricht, marked 10 years behind bars after he was given a double life sentence by United States authorities in 2013.

On Oct. 2 Ulbricht posted on X (formerly Twitter) that he has already spent a full decade in prison and fears he will spend the remainder of his life “behind concrete walls and locked doors.” He said all he can do now is “pray for mercy.”