# WTRMRK — Invisible Watermarking & Cryptographic Provenance Protocol

> WTRMRK (wtrmrk.io) is a client-side invisible watermarking and cryptographic verification platform. It allows users to embed imperceptible provenance data into images, documents, audio, and video without visual or auditory degradation.

## Key Capabilities
- **Invisible Image Steganography**: Uses Least Significant Bit (LSB) encoding on RGB planes with SHA-256 integrity hashing.
- **Invisible Document & Code Steganography**: Uses zero-width Unicode characters (`\u200B`, `\u200C`, `\u200D`, `\uFEFF`) to hide provenance inside text and code with zero visual footprint.
- **Audio & Video Steganography**: Injects cryptographic metadata into media container atom trailers while preserving playback.
- **Tamper Verification**: Evaluates original file cryptographic digest against extracted payload to detect crops, alterations, or re-encodings.
- **100% Client-Side Privacy**: All processing executes locally in the user's browser sandbox via WebAssembly and Web Crypto APIs. No files are ever sent to remote servers.

## Target Audiences & Use Cases
- **Photographers & Digital Illustrators**: Protect copyright, prevent uncredited reposts on Instagram/X/Pinterest, prove prior creation.
- **AI Labs & Foundation Model Developers**: Mark synthetic media at generation source to comply with provenance regulations (C2PA/AI watermarking standards).
- **Newsrooms, Journalists & Fact-Checkers**: Embed immutable origin timestamps on photojournalism assets to combat synthetic misinformation.
- **Film, TV & Music Studios**: Embed invisible recipient IDs into screeners, stems, and pre-release media to trace leaks.
- **Brands & Creative Agencies**: Track commercial campaign assets across syndication and licensing partners.
- **Legal, HR & Compliance**: Embed verifiable tamper-detection into confidential contracts, NDAs, and PDF records.
- **Creators & Freelancers**: Share client proofing files without destructive, ugly overlay logos.
- **General Public**: Instant, free creation proof for any document or image.

## Supported Formats
- Images: PNG, JPG, JPEG, WebP, TIFF, BMP
- Documents: PDF, DOCX, TXT, MD, CSV, JSON, JS, TS, HTML, PY, RS, GO
- Video: MP4, WebM, MOV
- Audio: MP3, WAV

## Canonical Reference
- Website: https://wtrmrk.io
- License: Open Client-Side Web Protocol
- Pricing: Free, no registration required