Bitcoin falls to its lowest level since June as Zuckerberg testifies on Libra

Bitcoin slumped as much as 9% on Wednesday — hitting its lowest level since June — ahead of Facebook CEO Mark Zuckerberg's testimonial on the company's proposed cryptocurrency, Libra. 
Zuckerberg is due to answer questions from a House Financial Services Committee about Facebook's ambitions in financial services. 
Other cryptocurrencies also slipped, with Ethereum falling 10% at its lows. 
Watch Bitcoin trade live here.
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