Bitcoin is back above $20,000, days after breaking a two-month-long ranging-market spell and printing a string of green daily candles.  In the past 24 hours, the top cryptocurrency by market capitalization grew over 11%, tapping $21,000 in the wee hours of Jan 14 before recoiling to $20,817 at press time. In the past seven days, the asset’s price has surged by over 23%,...