1. Institute Digital Assets, Academy of Economic Sciences, Bucharest, Romania
2. School of Business and Economics, Humboldt-Universität zu Berlin, Berlin, Germany
3. National Yang Ming Chiao Tung University, Hsinchu, Taiwan
4. Additional Affiliation: Faculty of Mathematics and Physics, Charles University Prague, CZ
5. Institute of Statistics at Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
6. Heidelberg Institute of Theoretical Studies (HITS), Heidelberg, Germany