"optimism over the future of digital currencies".https://www.investing.com/news/technology-news/cryptocurrency-market-cap-nears-120b-amid-monster-bitcoin-rally-515360.
http://www.investopedia.com/news/bitcoin-price-record/?partner=YahooSA&yptr=yahoo
http://www.investopedia.com/news/bitcoin-price-record/?partner=YahooSA&yptr=yahoo