For a Canadian teenager who lived the high life in Miami while spending the proceeds of a multimillion-dollar cryptocurrency fraud scheme on luxury cars and a private jet, the ruse began to unravel with a traffic stop. 

Trenton Richard David Johnston was seated in the back of a white Rolls-Royce Cullinan with tinted windows one evening this past March when a sheriff’s deputy told the driver to pull over.

According to an investigator’s account — not contested by Johnston — it wasn’t long before the other people in the SUV spilled what they knew about the mysterious Canadian. All three told law enforcement they’d met Johnston in the past year and were living off his generosity.

Johnston didn’t have a real job, they said, but he had made…