BLOCK-CHAIN BASED CRIME EVIDENCE SYSTEM

Abstract

The integrity and traceability of crime evidence play a vital role in ensuring fair and just legal proceedings. Traditional systems for managing evidence suffer from centralization, vulnerability to tampering, lack of transparency, and inefficient tracking mechanisms. To address these issues, this paper proposes a blockchain-based crime evidence system designed to ensure immutability, transparency, and enhanced security. The system leverages cryptographic hashing, symmetric encryption, and a blockchain structure to maintain an unalterable chain of custody. Features include secure user authentication, geolocation tracking, QR code-based verification, and comprehensive audit logging. Developed using technologies such as Python, Streamlit, SQLite, bcrypt, Fernet, and SHA-256, the system provides a robust platform for digital evidence handling. Functional and security testing confirms the effectiveness of core mechanisms including tamper detection and access control. While the system demonstrates promising capabilities, challenges related to scalability, storage, and legal compliance remain. Future enhancements include integration with enterprise blockchain platforms and adoption of advanced cryptographic protocols.