NISHAAN is a decentralized evidence

NISHAAN is a decentralized evidence management system designed to restore trust in the justice system by making digital evidence tamper-proof, verifiable, and anonymous.

Problems it solves:

1. Broken chain of custody: Evidence gets altered or mishandled when passed through multiple systems and people.

2. Deepfakes & fake timelines: No reliable way to prove when/where a video was originally recorded.

3. Whistleblower risk: Existing systems can expose identities, discouraging people from reporting crimes.

3. Centralized control risk: Admins in traditional databases can delete or manipulate evidence without trace.

Core solution:

NISHAAN replaces trust-based systems with cryptographic proof:

Stores evidence on IPFS (decentralized storage)

Anchors file hashes (CIDs) on Ethereum smart contracts

Ensures immutability (evidence cannot be altered)

Uses RBAC (Role-Based Access Control) for secure permissions

Enables anonymous submissions without identity leaks

Preserves original file integrity throughout the legal process

Key technical approach

Hybrid system: IPFS (files) + Blockchain (proof)

Smart contracts enforce strict roles (Admin, Police, Court)

“1-click adoption” keeps original file hash intact for whistleblower evidence

Client-side EXIF extraction prevents fake/old media submissions

Robust Web3 frontend handles wallet/network instability NISHAAN ensures that the exact evidence recorded is provably the same evidence presented in court—without relying on trust, only math.