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SALT LAKE CITY, UT - APRIL 26: Software engineer Mike Caldwell holds physical Bitcoins he minted in his shop on April 26, 2013 in Sandy, Utah. Bitcoin is an experimental digital currency used over the Internet that is gaining in popularity worldwide. (Photo by George Frey/Getty Images)
SALT LAKE CITY, UT - APRIL 26: Software engineer Mike Caldwell holds physical Bitcoins he minted in his shop on April 26, 2013 in Sandy, Utah. Bitcoin is an experimental digital currency used over the Internet that is gaining in popularity worldwide. (Photo by George Frey/Getty Images)

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    Bitcoin documentary in the works

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Bitcoin documentary in the works

CNN's Maggie Lake speaks with actor and director Alex Winter about his upcoming documentary about the origins of Bitcoin.

Bitcoin documentary in the works

CNN's Maggie Lake speaks with actor and director Alex Winter about his upcoming documentary about the origins of Bitcoin.