Sheng Songcheng, counselor to the People's Bank of China and executive deputy director of Lujiazui Institute of International Finance of China Europe International Business School, speaks at the session of "Blockchain: In Plain Words and In Practice" during the Boao Forum for Asia Annual Conference 2018 in Boao, south China's Hainan Province, April 10, 2018. (Xinhua/Yang Guanyu)