Building “MedCertify”: my student attempt at a blockchain-based health certificate. MedCertify is my FYP: a low-key blockchain prototype for health certificates using hash-on-chain, data-off-chain....

During this ctf I solved mainly in Web and some warmups involving some forensics. web-heavy endpoint fuzzing, JWT tampering, WebSocket abuse—plus warmup forensics (split ZIP, hex-to-ZIP), ROT trick...