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Version
1.6
Size
150.08 Mb
Updated
2 weeks ago
Released
02 May 2026
Description
BlockFact introduces .facti — a new image file format that proves a photo is authentic, unedited, and captured at a verified time and place.
Every photo you take with BlockFact is cryptographically sealed at the moment of capture. The result is a .facti file—an image with built-in proof of origin that anyone can verify, without trusting the photographer, the platform, or us.
HOW IT WORKS
1. Take a photo with BlockFact
2. Your device generates a zero-knowledge proof and Poseidon hash—entirely on-device, no upload required.
3. The proof is registered on the StarkNet blockchain.
4. A .facti file is built locally on your phone—containing the image, an invisible watermark, and the on-chain registration.
The photo never leaves your device. Only a small cryptographic proof is sent to the blockchain.
WHAT MAKES .FACTI DIFFERENT
Unlike JPEG or PNG, a .facti file carries its own proof of authenticity:
• When was it taken? Verified by on-chain timestamp.
• Where was it taken? GPS coordinates sealed in the cryptographic hash
• Who took it? Linked to the creator's blockchain wallet
• Has it been edited? The invisible watermark and hash detect any tampering.
Anyone can verify a .facti file at blockfact.io/verify—just drag and drop.
WHO IS THIS FOR?
• Journalists documenting events where authenticity matters
• Photographers proving original work and protecting against AI-generated fakes
• Legal and insurance professionals who need verifiable visual evidence
• Content creators establishing provenance before publishing
• Anyone who needs to prove a photo is real
FOR DEVELOPERS
BlockFact is also available as a React Native SDK (@blockfact/react-native-facti-pro) for developers building apps that need verified image capture. The BlockFact app is the
reference implementation—try it to understand the .facti format, then integrate the SDK into your own product.
PRIVACY BY DESIGN
• Photos never leave your device—only a cryptographic hash is registered on-chain.
• No accounts required beyond sign-in—no personal data collected
• Zero-knowledge proofs mean the blockchain verifies your proof without seeing your photo.
• Open verification—anyone can check a .facti file independently
BUILT ON
• StarkNet blockchain (Ethereum L2)
• Groth16 zero-knowledge proofs via Arkworks
• Poseidon hashing (quantum-resistant)
• IANA-registered MIME type: image/vnd.blockfact.facti
Estimates
Availability
Devices
iPhone5s
iPadAir
iPadAirCellular
iPadMiniRetina
iPadMiniRetinaCellular
iPhone6
iPhone6Plus
iPadAir2
iPadAir2Cellular
iPadMini3
iPadMini3Cellular
iPodTouchSixthGen
iPhone6s
iPhone6sPlus
iPadMini4
iPadMini4Cellular
iPadPro
iPadProCellular
iPadPro97
iPadPro97Cellular
iPhoneSE
iPhone7
iPhone7Plus
iPad611
iPad612
iPad71
iPad72
iPad73
iPad74
iPhone8
iPhone8Plus
iPhoneX
iPad75
iPad76
iPhoneXS
iPhoneXSMax
iPhoneXR
iPad812
iPad834
iPad856
iPad878
iPadMini5
iPadMini5Cellular
iPadAir3
iPadAir3Cellular
iPodTouchSeventhGen
iPhone11
iPhone11Pro
iPadSeventhGen
iPadSeventhGenCellular
iPhone11ProMax
iPhoneSESecondGen
iPadProSecondGen
iPadProSecondGenCellular
iPadProFourthGen
iPadProFourthGenCellular
iPhone12Mini
iPhone12
iPhone12Pro
iPhone12ProMax
iPadAir4
iPadAir4Cellular
iPadEighthGen
iPadEighthGenCellular
iPadProThirdGen
iPadProThirdGenCellular
iPadProFifthGen
iPadProFifthGenCellular
iPhone13Pro
iPhone13ProMax
iPhone13Mini
iPhone13
iPadMiniSixthGen
iPadMiniSixthGenCellular
iPadNinthGen
iPadNinthGenCellular
iPhoneSEThirdGen
iPadAirFifthGen
iPadAirFifthGenCellular
iPhone14
iPhone14Plus
iPhone14Pro
iPhone14ProMax
iPadTenthGen
iPadTenthGenCellular
iPadPro11FourthGen
iPadPro11FourthGenCellular
iPadProSixthGen
iPadProSixthGenCellular
Pricing by country
| Country | Price |
|---|---|
| Canada | free |
| China | free |
| France | free |
| Germany | free |
| Italy | free |
| Netherlands | free |
| Portugal | free |
| Spain | free |
| UK | free |
| India | free |
| Japan | free |
| Korea, Republic Of | free |
| Poland | free |
| Russia | free |
| Turkey | free |
| USA | free |
| Ukraine | free |
