BlockFact
Media You Can Trust
What is BlockFact?
BlockFact is a cryptographic authenticity protocol for media. It transforms photos and videos into tamper-proof digital records with embedded metadata, secure encryption, and blockchain verification—protecting truth in an age of manipulation and misinformation.
Whether you're capturing proof, minting NFTs, or verifying claims, BlockFact gives your content undeniable provenance.
The Trust Crisis is Real
BlockFact is live and solving the digital trust crisis
How It Works
Six steps from capture to verified proof
Capture the Media
Users take a photo or video using the BlockFact mobile app. The capture includes device attestation (Apple Secure Enclave / Android TEE), timestamp, and GPS location — proving the content came from a real, untampered device.
Add Non-Visual Watermark
The Poseidon hash — a ZK-friendly cryptographic fingerprint of the content and metadata — is computed and steganographically embedded into the image pixels. This invisible watermark survives screenshots, cropping, and re-encoding, and is the same hash that gets proven on-chain.
AI Embedding & Vector Registration
On-device MobileCLIP generates a 512-dimensional visual fingerprint of your content. This embedding is stored in our Pinecone vector database alongside your on-chain proof — enabling instant similarity search and tamper detection across the entire BlockFact network.
On-Chain Proof Verification
A Groth16 zero-knowledge proof is generated on-device and verified on-chain via the Garaga verifier. Content is hashed using Poseidon (ZK-friendly, quantum-resistant) and registered on StarkNet with timestamp, device attestation, and location commitments.
Generate the .facti File
The media is wrapped into a .facti container with encrypted metadata, on-chain transaction reference, watermarked content, and optional compression flags.
Universal Verification
Anyone can verify content at blockfact.io/view, inspect the StarkNet proof, and confirm authenticity. Shared links open directly in the app via Universal Links. Our Chrome extension (beta) scans active websites for .facti files and verifies them in-browser.
AI Embedding & Vector Registration
LiveEvery registration generates an on-device MobileCLIP embedding — a 512-dimensional visual fingerprint stored in Pinecone alongside your on-chain proof. Verify any image at blockfact.io/verify.
Instant Visual Similarity Search
Drop any image at blockfact.io/verify — matches against all registered content in seconds with similarity scores and on-chain proof links
Tamper & Reupload Detection
AI embeddings survive cropping, screenshots, and re-encoding — modified content still matches the original registration
Fully On-Device Processing
MobileCLIP runs natively on your phone — your images never leave the device. Only the 512-dim vector is sent to the backend
The .facti Container
This IANA-approved media type creates a verifiable asset that includes:
Why BlockFact is Different
Built for the future of digital trust
Blockchain-backed trust
Powered by StarkNet for immutable, quantum-resistant proof verification
Hardware device attestation
Apple Secure Enclave and Android TEE prove content came from a real device
On-device zero-knowledge proofs
Native Groth16 proof generation on iOS and Android, verified on-chain via Garaga
Encrypted metadata
Privacy and control over your sensitive information
Open access format
Image remains viewable; metadata unlockable via IANA-registered .facti format
Quantum-resistant by design
Poseidon hashing and STARK-based verification remain secure against quantum attacks
Use Cases
Protecting truth across industries
Media & Legal
Journalism & Media
- •War correspondents prove photos were taken at the reported location and time
- •Newsrooms verify freelancer submissions — device attestation confirms real camera
- •Citizen journalism during protests — immutable timestamp proves footage existed before denials
Legal & Law Enforcement
- •Crime scene documentation — chain of custody starts at capture, not the evidence locker
- •Body cam footage verification — proves footage wasn't edited between capture and court
- •Accident scene documentation — both parties photograph damage, neither can alter after
Social Media & Platforms
- •Platforms badge verified original content vs AI-generated at upload time
- •Creators prove authorship — not scraped, not deepfaked
- •Influencer marketing — brands verify sponsored content was created on location
- •Dating apps — profile photos verified as taken on the user's actual device
Enterprise & Supply Chain
Insurance & Claims
- •Policyholders photograph damage at claim time — GPS + timestamp eliminates staged claims
- •Adjusters document site visits with tamper-proof records — reduces internal fraud
- •Before/after proof for property insurance — contractors can't submit old photos as new work
Logistics & Supply Chain
- •Proof of delivery — driver photographs package at doorstep, GPS + timestamp on-chain
- •Warehouse condition documentation — provenance photos clarify liability in damage disputes
- •Cold chain compliance — photos of temperature displays at each handoff, immutable for auditors
Real Estate & Construction
- •Move-in/move-out condition reports — disputes resolved by on-chain timestamps
- •Construction progress billing — GPS-verified site photos prove milestone completion
- •Building inspections — tamper-proof evidence of code violations
Public Sector & Environment
Health Records
- •Clinical trial photo documentation — wound healing photos can't be swapped between patients
- •Telemedicine — patient-submitted images verified as taken on their device
- •Surgical documentation — operating room photos timestamped for malpractice defense
Fair Trade & Environment
- •Farm-level harvest documentation — GPS proves origin region for ethical sourcing
- •Working condition audits — device attestation proves the auditor was physically present
- •Carbon credit verification — reforestation projects document tree growth with provenance chain
Government & Public Sector
- •Election monitoring — observers photograph ballot counting with device-attested images
- •Infrastructure inspections — bridge/road condition documented with immutable records
- •Disaster relief — GPS-verified photos prove aid reached intended locations
Creative & IP
Art, IP & Collectibles
- •Artists register original works at creation time — proves authorship before copies exist
- •Auction houses document item condition pre-sale with tamper-proof imagery
- •NFT backing — digital art linked to provenance-verified physical original
- •Designers photograph original sketches with timestamp proving prior art
Environmental & Conservation
- •Wildlife monitoring — field researchers document species sightings with location proof
- •Pollution documentation — immutable timestamp before companies can clean up
- •Deforestation monitoring — ground-level provenance photos cross-referenced with satellite imagery
HIPAA-Friendly by Design
Zero-knowledge proofs verify medical imaging authenticity without ever seeing patient data. No PHI processed, no BAA required, no breach risk.
Verify Everything, Reveal Nothing
BlockFact uses zero-knowledge proofs to verify medical scans are authentic without ever seeing the images or patient identifiers.
What We Process
- ✓Cryptographic hashes (Poseidon)
- ✓Device signatures
- ✓Timestamps
- ✓Zero-knowledge proofs
What We Never See
- ✗Medical images
- ✗Patient names or IDs
- ✗Protected Health Information (PHI)
- ✗Any patient identifiers
On-Premise Processing
All PHI stays on your devices. We only receive cryptographic hashes, never the actual medical data.
Zero-Knowledge Proofs
Prove scan authenticity for legal cases, insurance claims, or audits without revealing patient data.
Not a Business Associate
We don't process PHI, so no BAA required. Reduces compliance burden and breach risk.
Healthcare Use Cases
Medical Imaging Devices
Embed BlockFact in CT scanners, MRI machines, X-ray systems. Every scan is cryptographically verified at capture, with full audit trail and tamper detection.
- • FDA submission support
- • DICOM integration
- • Offline operation
Legal & Insurance
Verify scan authenticity for malpractice cases or insurance claims using zero-knowledge proofs. No need to share PHI with third parties.
- • Court-admissible proofs
- • Insurance verification
- • Regulatory audits
Quantum-Resistant by Design
Quantum computers can forge future signatures, but they can't rewrite history. BlockFact's provenance records are protected by three independent quantum-resistant layers.
Poseidon Hashing
ZK-friendly hash function with 256-bit security. Grover's algorithm halves it to 128-bit effective — still beyond any foreseeable quantum computer.
STARK-Based Proof Verification
StarkNet's FRI protocol uses hash-based commitments, not elliptic curves. Proof verification is quantum-resistant by design.
Hardware Device Attestation
Apple Secure Enclave and Android TEE provide a physical trust anchor. Quantum computers can't retroactively generate attestation tokens that hardware manufacturers issued in the past.
The only quantum-vulnerable component is the transaction signing layer — and thanks to StarkNet's account abstraction, it's a swappable module. When post-quantum signature schemes (SPHINCS+, Dilithium) are adopted, BlockFact upgrades the account contract. Existing registrations remain valid.
.facti — A New Standard
For Trustworthy Media
Even without unlocking metadata, .facti lets anyone see the original image. Full verification requires authorized access or public proof on StarkNet.
Encrypted metadata
Secure storage of sensitive information
Tamper-proof hashing
Poseidon hash verification for content integrity
On-chain registration
Blockchain verification via StarkNet
Zero-knowledge proof
On-device Groth16 proof verified on-chain
Interoperable container
Standard format for universal compatibility
Trust & Compliance
BlockFact is built from the ground up to meet the highest standards of security, transparency, and global interoperability.
Official Media Formats — IANA Registered
The .facti, .facta, and .factv file types are officially registered with the Internet Assigned Numbers Authority (IANA) as recognized MIME media formats.
.facti
Verifiable Image Files
image/vnd.blockfact.facti →
.facta
Verifiable Audio Files
audio/vnd.blockfact.facta →
.factv
Verifiable Video Files
video/vnd.blockfact.factv →
This ensures:
- Cross-platform compatibility with systems that recognize global MIME types
- Secure indexing and processing across web, OS, and enterprise environments
- Standards-compliant architecture, enabling future integrations at the protocol level
End-to-End Encryption & Privacy
All embedded metadata (e.g. location, time, device ID) is encrypted using industry-grade algorithms. You control who can access it, or whether it's revealed at all.
On-Device Zero-Knowledge Proofs
Every registration includes a Groth16 proof generated natively on the user's device and verified on-chain via the Garaga verifier — proving content authenticity without exposing private data.
Immutable Audit Trails
Every interaction—media registration, proof submission, or reputation change—is logged immutably on StarkNet for full auditability.
FACT Token
Powering the BlockFact Ecosystem
Our native token, FACT, powers on-chain verification, rewards, and in-app transactions throughout the BlockFact ecosystem.
Pay for Services
Use FACT tokens for registration and premium verification tools
Earn Rewards
Get rewarded with FACT tokens for verified contributions to the network
Enable Ecosystems
Power tipping and access control in content verification ecosystems
FACT Token is Live on StarkNet
Every registration costs 0.01 FACT. New users receive an airdrop on account creation. Fees flow back to the factory contract to fund future airdrops — a self-sustaining verification economy.