The proposition was tantalizing: Handsome returns awaited investors who would be willing to provide an infusion of cryptocurrency to Elon Musk, the billionaire chief executive of Tesla and founder of SpaceX, for a moneymaking venture.
It seemed too good to be true, because it was.
Investors lost $2 million in six months to fraudsters who impersonated Mr. Musk, the Federal Trade Commission said in a report released on Monday that was meant to draw attention to a spike in cryptocurrency scams.
The commission found that nearly 7,000 people lost a reported $80 million overall from October through March as part of various scams targeting investors in Bitcoin and other cryptocurrencies like Dogecoin, a nebulous marketplace that Mr. Musk has bullishly promoted on Twitter. The median amount that they lost was $1,900, according to the commission.
The spate of fraud cases — a nearly 1,000 percent increase compared with the same period the previous year, the report said — came as the price of Bitcoin and Dogecoin soared toward record highs.
“All of this plays right into the hands of scammers,” the commission’s report said. “They blend into the scene with claims that can seem plausible because cryptocurrency is unknown territory for many people.”
It was not immediately clear how many people had been duped by the impersonators or whether they had received solicitations for the money. It also was not clear whether they had used a particular cryptocurrency platform.
The commission did not immediately provide more details about the cases.
Representatives for Mr. Musk at Tesla also did not immediately respond to a message seeking comment on Monday night.
The electric-car maker disclosed in its annual report in February that it had bought $1.5 billion worth of Bitcoin, which Tesla said was part of an initiative to invest in alternative assets like digital currencies and gold bullion.
The revelation, along with Mr. Musk’s announcement in March that Tesla would accept Bitcoin as payment for cars in the United States, sent the price of Bitcoin skyward by more than 10 percent. But then Mr. Musk reversed course this month, saying that the company would no longer accept the cryptocurrency because of concerns over its impact on the environment.
Mr. Musk has similarly sent mixed messages regarding Dogecoin, which was created as a cryptocurrency parody in 2013 and has recently been booming.
Last week, he polled his 55.1 million followers on Twitter on whether Tesla should accept Dogecoin; 78 percent of respondents said yes. He also revealed last week that SpaceX would launch a satellite to the moon next year in exchange for a payment in Dogecoin. In a May 8 appearance on “Saturday Night Live,” Mr. Musk said that cryptocurrency was both “the future of currency” and “a hustle.”
Joseph A. Grundfest, a professor of law and business at Stanford and a former member of the Securities and Exchange Commission, said in an interview on Monday night that the surge in scams involving cryptocurrency was not at all surprising amid the surging prices.
He said that investors should be more circumspect when faced with propositions like those concocted by the impersonators of Mr. Musk.
“Don’t send cryptocurrency to Elon Musk,” Mr. Grundfest said. “He already has more than he needs.”
The Federal Trade Commission cautioned on Monday in the report that fraudsters had used online dating platforms to lure people into cryptocurrency scams. About 20 percent of the money that people reported losing through romance schemes since October was sent in cryptocurrency, the report said.
The commission also noted that people ages 20 to 49 were more than five times as likely as older people to report losing money on cryptocurrency investment scams.
Cryptocurrency experts cautioned that it was especially difficult for victims of fraud schemes to get their money back and that cryptocurrency had become a preferred payment method for those orchestrating ransomware attacks.
“As a practical matter, there is no recourse,” Mr. Grundfest said. “Why crypto? It’s very simple. It’s very hard to trace.”
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