BTCC (formerly Bitcoin China) is a United Kingdom[1]-based bitcoin exchange that was once the world's second largest by volume in October 2014.[2] Founded in June 2011 as BTCChina, it was China's first bitcoin exchange, and most of its customers are thought to be from the domestic market.[3] BTCChina rebranded as BTCC and launched the domain www.btcc.com in 2015.[4]