Bitcoin's impressive march into record territory continued Sunday afternoon. The digital currency, which has been on a tear since the US Thanksgiving holiday, soared past $9,000 a coin early Sunday morning. By Sunday afternoon in New York the digital currency was trading at an all-time high of $9,481 a coin, a more than $1,000 increase from its price mid-day on Thursday. It gave up some of those gains and by 5:56 p.m. ET bitcoin was trading at $9,343 a coin. Bitcoin's rapid appreciation appears to have coincided with a spike in the userbase of the largest platform for buying and selling cryptocurrencies in the US. ... (full story)