TruthChain - Verification Portal

The TruthChain Web Client is the public-facing verification tool for the TruthChain protocol. It allows anyone (news agencies, auditors, general users) to verify the authenticity of an image instantly.

Zero-Trust Architecture: This application verifies files without uploading them. It generates a SHA-256 cryptographic hash locally in the browser and queries the TruthChain ledger only with the hash, ensuring complete privacy.

TruthChain Portol Link

• https://truthchain-frontend.onrender.com/
• Use this verified and tampered images from google drive link https://drive.google.com/drive/folders/1QQUg-KlTxiGyF_VuV1hD1RlzEP__1W5Q?usp=sharing

Key Features

• Client-Side Cryptography: Uses crypto-js to calculate SHA-256 hashes entirely within the browser. The actual file never leaves the user's device.
• Instant Verification: Queries the immutable ledger to retrieve hardware-backed evidence (GPS, Timestamp, Device ID).
• Tamper Detection: If a single bit of the image has been altered, the hash changes, and verification fails immediately.
• Visual Evidence: Displays the "Proof of Presence" (Map location and exact time of capture) in a clean, modern UI.

Tech Stack

• Framework: React 18 (Vite)
• Styling: Tailwind CSS (Dark Mode / Cyberpunk Aesthetic)
• Animations: Framer Motion (Smooth transitions for "Scanning" effects)
• Cryptography: Crypto-JS (Browser-side hashing)
• Icons: Lucide React

How it Works

1. Drop: User drags and drops a suspect image.
2. Hash: The browser calculates the unique SHA-256 fingerprint.
3. Query: The frontend sends only the hash to the backend API (/verify/{hash}).
4. Result:
   • Match: Returns the original Hardware Signature, GPS, and Timestamp.
   • Mismatch: Flags the image as potentially fake or tampered with.

Code Highlight: Client-Side Hashing

The core of our "Zero-Trust" approach:

const generateSHA256 = (file) => {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onload = (e) => {
      // Create hash from raw binary data
      const wordArray = CryptoJS.lib.WordArray.create(e.target.result);
      resolve(CryptoJS.SHA256(wordArray).toString());
    };
    reader.onerror = reject;
    reader.readAsArrayBuffer(file);
  });
};