U.S. futures and Asian shares traded mostly lower on Friday, tracking Wall Street's losses as technology stocks again dragged on markets. Bitcoin sank to roughly half its record price, giving back all it gained since U.S. President Donald Trump won the White House for his second term. Tokyo's Nikkei 225 was up 0.5% to 54,073.52, recovering from losses earlier this week, with technology-related stocks leading gains.