🚔 Evidence Management System using Blockchain, IPFS & Pinata

A decentralized application (dApp) that enables secure and immutable management of digital evidence using Ethereum smart contracts and IPFS. Role-based access control ensures only authorized parties like police officers and court officials can interact with the system, protecting the integrity of uploaded evidence.

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📦 Tech Stack

• Ethereum (Smart Contracts - Solidity)
• Truffle (Development Framework)
• Ganache (Local Ethereum Blockchain)
• MetaMask (Wallet & Authentication)
• IPFS via Pinata (Decentralized File Storage)
• HTML/CSS/JavaScript (Frontend)

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🔧 Setup Instructions

✅ Prerequisites

Install the following tools:

• Node.js
• Truffle

  npm install -g truffle

• Ganache
• MetaMask
• Pinata Account

1. Clone the Repository

git clone https://github.com/Niyati1206/EvidenceManagementSystem.git
cd EvidenceManagementSystem

2. Install Dependencies

npm install

3. Setup Pinata for IPFS Uploads

• Go to https://www.pinata.cloud/
• Sign up and verify your email
• Go to your API Keys dashboard
• Generate a new key and copy: PINATA_API_KEY PINATA_SECRET_API_KEY
• Create a config.js file and add your pinata key as follows:

  var config = {
  PINATA_API_KEY: 'add_your_key_here',
  PINATA_SECRET_API_KEY: 'add_your_secret_key_here'
  };

4. Start Ganache (Local Blockchain)

• Open the Ganache app
• Create a new workspace and add the truffle-config.js file to it
• Note the RPC server URL (usually http://127.0.0.1:7545)

5. Compile and Deploy Smart Contracts

truffle compile
truffle migrate --reset

• Copy the contract address from the "EvidenceManagement" contract and paste it into

1. app.js (line number 7)
2. court-dashboard.js (line number 7)
3. police-dashboard.js (line number 7)

• Also update the ABI in frontend of all three js files

6. Run the frontend

npx http-server ./public

Then open in your browser: 📍 http://localhost:8080

7. Set up metamask

• Configure the network and set up a local network

• Add atleast 2 accounts (For Police and Court) to the metamask wallet using the private key from Ganache accounts

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