Onetime cryptocurrency mogul Do Kwon was sentenced Thursday to 15 years in prison after a $40 billion crash revealed his crypto ecosystem to be a fraud. Victims said the 34-year-old financial technology whiz weaponized their trust to convince them that the investment — secretly propped up by cash infusions — was safe.

Kwon, a Stanford graduate known by some as “the cryptocurrency king,” apologized after listening as victims — one in court and others by telephone — described the scam’s toll: wiping out nest eggs, depleting charities and wrecking lives. One told the judge in a letter that he contemplated suicide after his father lost his retirement money in the scheme.

Judge Paul A. Engelmayer said at a daylong sentencing hearing in Manhattan federal court that the government’s recommendat

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