Bitcoin fell below $70,000 early Thursday as the selloff in tech stocks spilled into digital assets, piling pressure on cryptocurrencies. The moves follow sharp falls in U.S. equity markets, as heavyweight stocks linked to artificial intelligence have come under pressure. The Nasdaq Composite index dropped 1.5% Wednesday and earnings after the close from Alphabet and Qualcomm ensured investors continued to remain nervous over the impact of AI on the stock market.