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In general, billionaire Mark Cuban advises putting your savings into "the cheapest SPX mutual fund you can find," he tells Vanity Fair.

But, "if you're a true adventurer and you really want to throw the Hail Mary," says Cuban, "you might take 10 percent [of your savings] and put it in bitcoin or ethereum."

Digital currencies like bitcoin and ethereum are built on a software called blockchain, which cuts out the need for a middleman. That means no banks clear your transactions.

Still, it's a speculative asset and prone to dramatic price swings. Tony Robbins says investing in bitcoin is "like going to Vegas."

Others aren't sold on the idea at all. JPMorgan Chase CEO Jamie Dimon called bitcoin a "fraud." "It's just not a real thing. Eventually it will be closed," he said at the Delivering Alpha conference in September presented by CNBC and Institutional Investor. "It won't end well. Someone is going to get killed."

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Whats with the change in view? I am just waiting for Jamie to come around! 

Read More-https://www.cnbc.com/2017/10/19/mark-cuban-heres-how-and-when-to-put-your-money-in-bitcoin.html