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CHICAGO — Bitcoin’s debut on a major U.S. exchange is a hit so far, with the price of the first-ever futures contract for the virtual currency rising 18 percent.

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SAN FRANCISCO — Apple has bought Shazam, the maker of a song-recognition app that Apple’s digital assistant Siri has already been using to help people identify the music playing on their iPhones.

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SAN FRANCISCO — Netflix is sinking deeper into debt in its relentless pursuit of more viewers, leaving the company little margin for error as it tries to build the world’s biggest video subscription service.