1. Department of Statistics and Econometrics, Faculty of Cybernetics, Statistics and Economic Informatics, The Bucharest University of Economic Studies, Bucharest, Romania
2. Humboldt-Universität zu Berlin, IRTG Berlin, Germany
3. Blockchain Research Center, Humboldt-Universität zu Berlin, Berlin, Germany
4. Wang Yanan Institute for Studies in Economics, Xiamen University, Xiamen, People's Republic of China
5. Sim Kee Boon Institute for Financial Economics, Singapore Management University, Singapore Singapore
6. Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
7. National Chiao Tung University, Hsinchu, Taiwan
8. Department of Mathematics and Statistics, University of Cyprus, Nicosia, Cyprus
9. Central Bank of Cyprus, Nicosia, Cyprus
10. Yau Mathematical Sciences Center, Tsinghua University, and Beijing Institute of Mathematical Sciences and Applications, Beijing, People's Republic of China