Bitcoin dropped 7.4% to $40,631.78 at 2205 GMT on Thursday, down $3,248.05 from its previous close.
Bitcoin, the world's biggest and best-known cryptocurrency, is down 15.3% from the year-to-date high of $47,989 set on January 2.
Ether, the cryptocurrency linked to the ethereum blockchain network, fell 7.43% to $2,891.32 on Thursday, down $231.92 from its previous close.
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