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Bitcoin's future hinges on mining powerhouse China

Solution to capacity issue will need the support of country's mining collectives

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The concentration of bitcoin activity in China has some worried that the system could become vulnerable to meddling by the ruling Communist Party.

Hong Kong

WU Jihan still remembers the exhilaration he felt after learning about bitcoin in 2011.

A self-described computer geek fresh out of China's top university, Mr Wu soaked up everything he could about the digital currency's mysterious founder and its users' ambitions to