Reuters Bitcoin surged more than 3 on Tuesday as it approached a key resistance level at $14,000. Recent positive developments for the digital cryptocurrency include PayPal allowing its account holders to buy, sell, and transfer bitcoin, as well as Square's bitcoin purchase worth $50 million. If bitcoin is able to decisively trade above the $14,000 level, the next level of resistance traders will watch is its all-time high near $20,000. Visit Business Insider's homepage for more stories.