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South Korea is home to one of the world's largest Bitcoin exchanges - but the government there says virtual currency trading is overheating, fuelled by blind speculation. As a result, it plans to close such exchanges down, to save young people who invest in the cryptocurrency from losing money. The ÃÛÑ¿´«Ã½'s Vivienne Nunis talks to author of 'Bitcoin: The Future of Money'. (Image: A physical rendition of a Bitcoin, coloured red. Photo by Dan Kitwood/Getty Images)
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