BlockFact
Prove Your Photos Are Real
BlockFact turns every photo into a tamper-proof record — verified at capture, registered on the blockchain, impossible to fake. Built for journalists, newsrooms, and anyone who needs to prove a photo is real.
Free to use. No account required. Just take a photo and it's verified.
The Trust Crisis is Real
BlockFact is live and solving the digital trust crisis
How It Works
From photo to tamper-proof in under 5 seconds
Take a Photo
Snap a photo with the BlockFact app. We verify it came from a real device — not a computer or AI generator — and record the time and location.
Invisible Watermark
A unique digital fingerprint is embedded directly into the image pixels. It's invisible to the eye but survives screenshots, cropping, and sharing on social media.
Cryptographic Proof
Your phone generates a mathematical proof that the photo is authentic — all on-device, in under a second. The image never leaves your phone.
Blockchain Registration
The proof is registered on StarkNet, creating a permanent, tamper-proof record. Anyone can verify it independently — no need to trust us.
Get Your .facti File
Your verified photo is packaged into a .facti file — a new media format that carries its own proof of authenticity, like a passport for your image.
Verify Anytime
Anyone can check if a photo is authentic at blockfact.io/verify. Just drop an image — even a screenshot — and see if it matches a registration.
Under the hood: zero-knowledge proofs, Poseidon hashing, on-chain Groth16 verification via Garaga, MobileCLIP embeddings. Read the technical docs →
Why BlockFact is Different
Built for the future of digital trust
Permanent proof
Every registration is recorded on the blockchain — it can't be altered, deleted, or disputed.
Real device verification
We verify the photo came from a real iPhone or Android — not a computer, emulator, or AI tool.
Privacy by design
Your photos never leave your device. Only a cryptographic proof is sent to the blockchain.
Survives sharing
The invisible watermark stays intact through screenshots, cropping, messaging apps, and social media.
Open standard
The .facti format is IANA-registered — anyone can verify a file without needing our app.
Future-proof security
Built with quantum-resistant cryptography. Your registrations stay secure as technology evolves.
Who It's For
Built for people who need photos they can prove are real
Journalism & Media
War correspondents, newsrooms, and citizen journalists prove photos were taken at the reported time and place. No more disputed footage — every image carries its own chain of custody.
- →Verify freelancer submissions before publication
- →Prove footage existed before official denials
- →Citizen journalism with immutable timestamps
Social Media & Platforms
Platforms can badge verified original content at upload time. Creators prove authorship. Users know what's real and what's AI-generated.
- →Badge original content vs AI-generated
- →Creators prove authorship — not scraped, not deepfaked
- →Verified profile photos taken on a real device
Legal & Insurance
Crime scenes, accident documentation, and insurance claims start their chain of custody at the moment of capture — not when they reach the evidence locker.
- →Tamper-proof accident scene documentation
- →Eliminate staged insurance claims with GPS + timestamp
- →Body cam footage verification for court
Enterprise & Compliance
Construction progress, supply chain audits, and regulatory inspections documented with provenance that auditors can verify independently.
- →GPS-verified site photos for milestone billing
- →Proof of delivery with on-chain timestamps
- →Audit-ready documentation for regulators
Free to Use
Every registration is recorded on the StarkNet blockchain. New users get enough credits for 5,000 verifications — no credit card, no subscription, no paywall.
Built on StarkNetWant the technical details? Read the docs →