Certifichain: Secure QR Codes for Blockchain-Verified Digital Credentials. - Yudha Purwanto; Muhammad Faris Ruriawan; Agus Virgono; Hamzah Fatihulhaq; Muhammad Fauzan Anshori; Gregorius Belva Ivander; Rayyan Ramanda; Lutfiana Erniasari; Muhammad Daffa Satria (Digit. Threat. Res. Pract., 2025)