DocVer: Blockchain Document Verification Platform

DocVer is a web-based platform that leverages blockchain technology to provide secure, efficient, and tamper-proof document verification for institutions and organizations. The platform allows users to upload, verify, and manage documents, ensuring authenticity and trust in digital operations.

Features

• Blockchain-Backed Verification: Uses Ethereum smart contracts to store and verify document hashes, ensuring immutability and transparency.
• IPFS Integration: Documents are uploaded to IPFS (via Infura), providing decentralized and persistent storage.
• MetaMask Authentication: Users interact with the platform using MetaMask for secure wallet-based authentication and transaction signing.
• Document Upload: Upload PDF or image files, which are hashed and stored on the blockchain and IPFS.
• Document Verification: Instantly verify the authenticity of any document by uploading it; the platform checks the hash against the blockchain.
• Document Deletion: Authorized users can remove document hashes from the blockchain.
• Admin Dashboard: Manage exporters (institutions), add/edit/delete their information, and monitor platform statistics.
• QR Code Generation: Downloadable QR codes for each uploaded document, linking to its verification.
• Responsive UI: Built with Bootstrap 5 and enhanced with animations (AOS) for a modern user experience.

Smart Contract

The core of DocVer is the Verification.sol smart contract, which manages:

• Exporter (institution) registration and management (add, edit, delete).
• Document hash storage and lookup.
• Ownership and authorization logic for secure operations.

Tech Stack

• Frontend: HTML, CSS (Bootstrap, AOS), JavaScript
• Blockchain: Ethereum (Solidity smart contract)
• Web3 Integration: web3.js
• File Storage: IPFS via Infura
• Wallet: MetaMask
• QR Code: qrcode.js
• UI Libraries: Bootstrap 5, AOS

Getting Started

Prerequisites

• Node.js and npm
• MetaMask browser extension
• Access to an Ethereum testnet (e.g., Polygon, Goerli)
• Infura project credentials for IPFS

Installation

1. Clone the repository:

   git clone <repo-url>
   cd blockchainproject/Blockchain

2. Install dependencies:

   npm install

3. Configure Environment:

   • Update your Infura Project ID and Secret in js/App.js.
   • Set your deployed contract address and ABI in js/App.js.

4. Run the App:

   • Open index.html in your browser.
   • Make sure MetaMask is connected to the correct network.

Directory Structure

Blockchain/
  ├── about.html
  ├── admin.html
  ├── assets/
  ├── Contract/
  │   └── Verfication.sol
  ├── css/
  ├── delete.html
  ├── files/
  ├── index.html
  ├── js/
  ├── package.json
  ├── upload.html
  └── verify.html

Usage

• Upload: Go to "Upload" and select a document. Confirm the transaction in MetaMask.
• Verify: Go to "Verify" and upload a document to check its authenticity.
• Delete: Go to "Delete" to remove a document hash (requires authorization).
• Admin: Manage exporters and view stats in the "Admin" section.

Smart Contract Overview

See Contract/Verfication.sol for the Solidity code. Key functions:

• add_Exporter(address, string)
• delete_Exporter(address)
• alter_Exporter(address, string)
• addDocHash(bytes32, string)
• findDocHash(bytes32)
• deleteHash(bytes32)
• getExporterInfo(address)

Credits

• Developer: Praveen Kumar (Full Stack Developer)
• UI/UX: Bootstrap, AOS
• Blockchain: Solidity, web3.js