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Hong Kong: Despite being the world's most famous cryptocurrency, Bitcoin -- whose value on Thursday passed $100,000 for the first time -- has always been surrounded by mystery and controversy. Here are some things to know about the volatile digital unit, which has soared since Donald Trump won the US election promising to make the country the "bitcoin and cryptocurrency capital of the world": Secret creator In the 16 years since Bitcoin was invented, no one has been able to name its founder. It all started in October 2008, when a nine-page "white paper" attributed to Satoshi Nakamoto theorised "a...