The price was last down 5.25% at $63,806, having hit a two-week low of $63,555, while ether dropped 5.1% to $3,326.

Bitcoin is still showing a 52% gain for the year so far, as investors have piled into U.S. exchange-traded funds backed by spot bitcoin.

(Reporting by Amanda Cooper and Rae Wee; Editing by Harry Robertson)