ProofX

Protect and verify digital content with cryptographic watermarks and signatures.

WASM-powered invisible watermarking + ProofX API signing. One package, full content protection pipeline.

Install

npm install proofx

Quick Start

const ProofX = require('proofx');

const px = new ProofX({
  creatorId: 'YOUR_CREATOR_ID',  // Get free at proofx.co.uk
  apiKey: 'pk_live_...',          // Optional — get at proofx.co.uk/developer
});

// Protect an image (watermark + sign + embed signature)
const result = await px.protect('my-photo.png', { title: 'My Photo' });
// → result.image (protected Buffer), result.contentId, result.verifyUrl

// Protect text (hash + sign)
const doc = await px.protectText('My original article...', { title: 'My Article' });
// → doc.contentId, doc.verifyUrl

// Verify content
const check = await px.verify('sha256_hash_here');
// → { verified: true, creator_id: '...', timestamp: '...' }

// Verify an image file
const valid = await px.verifyImage('downloaded-image.png');

API

new ProofX(options)

| Option | Type | Required | Description | |--------|------|----------|-------------| | creatorId | string | Yes | Your 8-char creator ID from proofx.co.uk | | apiKey | string | No | API key for higher rate limits (pk_live_...) | | apiUrl | string | No | Custom API URL (default: api.proofx.co.uk) |

Methods

| Method | Description | |--------|-------------| | protect(image, opts) | Full protection: WASM watermark + hash + sign + embed signature | | protectText(text, opts) | Hash + sign text content | | verify(hash) | Verify content by SHA-256 hash | | verifyImage(image) | Hash an image and verify it | | hash(input) | Compute SHA-256 hash | | getCreator(id) | Look up a creator profile | | extractSignature(image) | Extract embedded signature from protected PNG | | perceptualHash(image) | Compute perceptual hash for fuzzy matching |

Rate Limits

| Plan | Daily Limit | Price | |------|------------|-------| | Free | 10 | $0 | | Creator | 100 | $9/mo | | Pro | 1,000 | $19/mo | | Studio | 10,000 | $49/mo |

Get API keys at proofx.co.uk/developer

Use Cases

• AI image pipelines — auto-protect every generated image
• CI/CD — sign assets on build
• Publishing — protect articles before they go live
• Music/audio — register tracks on creation
• Legal — timestamp documents for evidence

How It Works

1. WASM watermark — invisible marks in image pixels (survives screenshots, compression)
2. SHA-256 hash — computed locally, never uploads your content
3. Cryptographic signature — signed by ProofX KMS infrastructure
4. Embedded proof — signature stored inside the PNG file

The protected image is self-verifying. Anyone can extract the signature and check it.

Links

• ProofX — Web app
• Developer Portal — API keys
• MCP Server — AI integration (Gemini, Claude, Cursor)

License

MIT