By Ellen Chang The digital currency seems to be breaking away from the tech groups with which its prices have been moving in tune with for some time. Bitcoin (BTC), the most popular cryptocurrency, is rebounding despite big tech’s massive losses this week, and has risen to $20,000 after several weeks of trading in the $19,000 level. The digital currency is clinging onto the $20,000 level and was trading at $20,467 in mid-day, an increase of 7% during the past seven days, according to CoinGecko. Tech giants lost a whopping $560 billion in market value this week after Amazon (AMZN) – Get Amazon….