Bitcoin and companies tied to cryptocurrencies extended a nearly two-month swoon Monday, tracking with a broader market sell-off in technology companies that many see as overvalued.Bitcoin slid 5.6% after being down nearly 12% earlier in the day, settling in just above $85,000. The most-traded cryptocurrency is down about 33% since hitting a record $126,210.50 on Oct. 6, according to crypto trading platform Coinbase. Bitcoin had soared since April in line with the stock market and driven partly by a more cr ...