BLOCKCHAIN SECURITY
SHA-256 CHAIN
Blockchain-Secured Attendance System
Cryptographic Integrity & Fraud Prevention Infrastructure
A tamper-evident, cryptographic attendance verification infrastructure engineered to prevent proxy signing and attendance fraud through SHA-256 hash chaining, device fingerprinting, and geofencing.
Cryptographic Controls
Core System Architecture
SHA-256 Hash Chaining
Each recorded entry contains a cryptographic SHA-256 hash calculated from the previous entry. Tampering with any historical record invalidates all subsequent hashes.
Device Fingerprinting
Extracts unique hardware parameters to ensure student check-ins are restricted to registered hardware, preventing multi-account proxy signing.
Geofence GPS Validation
Validates student geolocation coordinates against defined lecture hall boundaries to guarantee physical presence during attendance logging.