Authors - Naga Sujitha Vummaneni, Ishan Kumar, Adarsh Mittal Abstract - Digital evidence is now central to cyber investigations, legal trials, and organizational audits. However, traditional evidence management systems rely heavily on centralized storage, making them vulnerable to unauthorized modifications, insider attacks, and in complete audit trails. This research introduces a Blockchain-Based Evidence Management System designed to secure digital evidence through immutability, transparent verification, and tamper proof storage of evidence hashes. The proposed solution integrates Java FX as a user-friendly interface, MongoDB for storing meta data, SHA-256 for generating unique evidence fingerprints, and the Polygon Mumbai blockchain for permanent registration of hash values. Users can upload evidence, verify its authenticity, and review all actions through a detailed activity log. Experimental results show that blockchain-backed verification reliably identifies tampered evidence and significantly strengthens the chain of custody. The system offers an efficient, scalable, and secure enhancement to traditional evidence-handling methods.
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