IRS CI has uncovered the top 10 cases of 2023, including 4 cryptocurrency scams. Among them, the founder of Oyster Pearl, Amir Bruno Elmaani, received 4 years in prison for tax evasion; James Zhong, a participant in the Silk Road dark site scam, received a year and one day in prison for wire fraud; Ian Freeman of New Hampshire was sentenced to 96 months in prison for a money laundering scheme using Bitcoin; Carl Sebastian Greenwood, co-founder of the OneCoin cryptocurrency scheme, was sentenced to 20 years in prison.