Image MIME Reference
FACTI
BlockFact Image
image/vnd.blockfact.facti
VS
Scalable Vector Graphics
image/svg+xml
SVG
A complete technical comparison of BlockFact Image and Scalable Vector Graphics — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
SVG wins on browser support
Feature Support
| Feature | FACTI | SVG |
|---|---|---|
| Transparency (Alpha) | Yes | Yes |
| Animation Support | ✕ No | Yes |
| Progressive Loading | ✕ No | ✕ No |
| HDR Support | Yes | Yes |
| EXIF Metadata | Yes | ✕ No |
| ICC Color Profile | Yes | ✕ No |
BlockFact Image
image/vnd.blockfact.facti
Extension
.facti
Container
BlockFact Authenticated Container
Compression
Container (Inherits payload compression, e.g., JPEG/PNG)
Algorithm
None (Pass-through to embedded payload)
Color Depth
Inherited from payload
Developed by
BlockFact
Released
2025
Magic Bytes
Unknown (Proprietary Container)
Scalable Vector Graphics
image/svg+xml
Extension
.svg.svgz
Container
XML Document
Compression
Uncompressed (Plain Text XML) / Lossless (GZIP via .svgz)
Algorithm
None (for .svg)GZIP (for .svgz)
Color Depth
Vector (Independent of bit-depth), CSS Colors (HEX, RGB, HSL, Display-P3)
Developed by
World Wide Web Consortium (W3C)
Released
2001
Magic Bytes
3C 73 76 67 (for <svg) / 3C 3F 78 6D 6C (for <?xml)
Browser Support Comparison
| Browser | FACTI | SVG |
|---|---|---|
Chrome
|
✕ |
✓ All
|
Firefox
|
✕ |
✓ All
|
Safari
|
✕ |
✓ All
|
Edge
|
✕ |
✓ All
|
IE (Legacy)
|
✕ |
✓
|
FACTI
FACTI Strengths
- Provides undeniable, mathematically verifiable proof of a photo's origin (time, location, and device) via the StarkNet blockchain [1.3.1]
- Privacy-first design utilizes zero-knowledge proofs (Groth16), meaning the actual image is never uploaded to a central server or blockchain
- Invisible watermarking ensures that even if the image is screenshotted or cropped, tampering can be detected
Limitations
- Lacks native rendering support in web browsers and standard image viewers, requiring specialized software to view
- Requires blockchain registration at the moment of capture, making it incompatible with existing legacy photos
- The proprietary nature of the container limits integration to environments supporting the BlockFact SDK
SVG
SVG Strengths
- Provides infinite resolution scalability, looking perfectly crisp on high-DPI (Retina) displays without increasing file size
- Extremely lightweight compared to raster formats for flat graphics, logos, and UI elements
- Can be manipulated dynamically via the browser's CSS and JavaScript engines (DOM integration)
Limitations
- Unsuitable for complex photographic images or photorealistic textures
- Poses critical security vulnerabilities (XSS and XML External Entity attacks) if user-uploaded SVGs are not heavily sanitized
- Rendering performance degrades significantly if the SVG contains tens of thousands of complex nodes or deeply nested paths
When to choose which format
FACTI
Use FACTI when…
- Journalism and Media Authentication
- Legal and Insurance Evidence
- AI Deepfake Prevention
- Content Provenance and Authorship
SVG
Use SVG when…
- Web Logos & UI Icons
- Responsive Web Design Elements
- Interactive Data Visualizations (D3.js)
- CSS and SMIL Web Animations