Millions in cryptocurrency vanished as agents watched helplessly

How do you put a virtual fence around Bitcoin? In 2020, Larry and Gary Harmon demonstrated the challenges law enforcement face on the blockchain frontier. One by laundering $311 million through crypto transactions and the other by remotely swiping $5 million worth of Bitcoin from federal custody. David Voreacos explores the aftermath of these very 21st-century crimes and the difficulties of securing digital assets.