BlockAdemiC: A Digital Distributed Verification System for Educational Activities in Higher Education. - Avraam Tepelidis; Eirini E. Mitsopoulou; Athanasios T. Patenidis; Kristina Livitckaia; Konstantinos Votis; Dimitrios Tzovaras (Distributed Ledger Technol. Res. Pract., 2025)