Audit-Guard: Blockchain-Integrated Corporate Audit System

VeriChain-Audit is a robust, transparent, and immutable audit management system designed to bridge the "Integrity Gap" in traditional auditing. By leveraging a Dual-Layer Hash Validation Framework (DLH-VF), the system synchronizes off-chain database records (MySQL/MongoDB) with on-chain cryptographic proofs (Ethereum Blockchain).

Key Features

• Dual-Layer Hash Validation (DLH-VF): Synchronizes Record_Hash (data fingerprint) and Blockchain_TX (transaction reference) for deep verification.
• Hybrid Anchor Storage: Optimized performance by storing only cryptographic fingerprints on-chain while keeping large datasets in high-performance local databases.
• Proactive Tamper Detection: Real-time integrity scanning that identifies discrepancies between local data and blockchain anchors.
• Closed-Loop Correction Workflow: Automated administrative tools to flag tampered records and trigger mandatory correction cycles.
• Multi-Role Orchestration: Dedicated dashboards and workflows for Admins, Auditors, and Business Users.

Technology Stack

• Backend: Node.js, Express.js
• Databases: MySQL (Relational data), MongoDB (NoSQL logs & evidence)
• Blockchain: Web3.js, Ethereum Smart Contracts (Solidity)
• Real-time: Socket.io for live integrity alerts
• Security: SHA-256 Hashing, Bcrypt encryption

System Architecture

The system operates on a hybrid model:

1. Data Layer: Records are initially stored in MySQL and MongoDB.
2. Hashing Layer: A unique SHA-256 fingerprint is generated for every critical action.
3. Anchor Layer: The fingerprint is anchored to the Ethereum blockchain via a smart contract.
4. Verification Layer: The system periodically scans the databases and compares current hashes against the on-chain "Source of Truth."

Getting Started

Prerequisites

• Node.js (v16+)
• MySQL Server
• MongoDB Instance
• Ethereum Provider (e.g., Ganache, Infura, or Alchemy)

Installation

1. Clone the repository:

   git clone https://github.com/spk-22/Audit-Guard
   

2. Install dependencies:

   npm install
   

3. Configure Environment: Create a .env file in the root directory and add your credentials:

DB_HOST=localhost DB_USER=root DB_PASS=yourpassword MONGO_URI=mongodb://localhost:27010/audit BLOCKCHAIN_NODE_URL=... PRIVATE_KEY=... CONTRACT_ADDRESS=...

4. Run the application:

   npm start
   

Roles & Workflows Business User: Uploads records and evidence. Admin: Manages users, reviews discrepancy alerts, and initiates correction loops. Auditor: Performs deep integrity scans and provides human-in-the-loop validation of blockchain proofs.