1. Department of Business and Economics, Berlin School of Economics and Law, Badensche Str. 52, 10825 Berlin, Germany
2. Blockchain Research Center, Humboldt-Universität zu Berlin, Berlin, Germany
3. International Research Training Group 1792 Humboldt-Universität zu Berlin, Berlin, Germany
4. Department of Finance, Asia University, Lioufeng Rd. 500, Taichung 41354, Taiwan
5. Wang Yanan Institute for Studies in Economics, Xiamen University, Xiamen, People's Republic of China
6. Sim Kee Boon Institute for Financial Economics, Singapore Management University, Singapore, Singapore
7. Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
8. National Yang Ming Chiao Tung University, Hsinchu, Taiwan