Kristoffer Koch, a Norwegian who had invested 150 kroner ($26.60) in 5,000 Bitcoins in 2009 and forgotten about them, was prompted by media interest in Bitcoin this April to rediscover his investment, which had now swelled to 5-million kroner ($886,000). A Bitcoin, which is currently valued at $202, is a digital currency that uses peer-to-peer technology to facilitate instant payments.