Dual-standard capture
Every photo gets a C2PA credential block (creator, time, GPS, device) embedded in the file plus an ERC-7053 record on the Numbers Mainnet. No other camera app does both.
Mobile App
ProofSnap — instant proof for frontline storytellers.
ProofSnap turns your smartphone into a trust engine. Photos and videos are sealed at the moment of capture with C2PA Content Credentials and an ERC-7053 on-chain receipt — instant, portable proof that works on any C2PA-compatible viewer. Purpose-built for journalists and storytellers; no crypto skills required.
What is ProofSnap?
ProofSnap is a free iOS camera app from Numbers Protocol that seals every capture with C2PA Content Credentials and an ERC-7053 on-chain receipt. It is purpose-built for frontline storytellers and journalists — focused on simplicity and verifiable authenticity, complementing the more feature-rich Capture Cam app for Web3 creators.
Capabilities
What you get
Offline-friendly
Sign locally on your phone with no internet connection. Registration syncs to the chain when you reconnect. Works for journalists in low-connectivity zones.
One-tap licensing
Set a license tier on capture (or apply per-album defaults) and ProofSnap exposes the photo as an x402 endpoint automatically.
Privacy by default
GPS, identity, and metadata fields are opt-in per capture. You decide what to disclose to viewers and AI agents.
Who it's for
Built for these scenarios
Frontline journalism
Photojournalists in conflict zones use ProofSnap to capture verifiable evidence. Used by Starling Lab for Ukraine war crimes documentation, published in Rolling Stone.
Insurance & legal
Adjusters and lawyers capture evidence with cryptographic proof of time and place. Survives chain-of-custody scrutiny in court.
AI-safe content creation
Creators who want to license to AI agents capture once, monetize on every fetch — without ever uploading to a centralised platform.
Built on open standards
C2PA 2.0
ERC-7053
x402 — per-fetch licensing
Frequently asked
ProofSnap questions
How is ProofSnap different from the iPhone or Android camera?
Built-in cameras embed basic EXIF metadata, but EXIF is unsigned and easily edited. ProofSnap signs every photo with a tamper-evident C2PA credential and writes an ERC-7053 receipt on-chain. That dual layer is what makes ProofSnap the only camera that satisfies the EU AI Act multi-layer Code of Practice.
Is ProofSnap free?
Yes. ProofSnap is a free download on iOS. Capture earns revenue when AI agents or publishers pay to license your photos via x402 — you keep the majority of every transaction. Android availability is on the roadmap; in the meantime Android creators can use the Capture Cam app for the same dual-standard signing.
How is ProofSnap different from Capture Cam?
Both apps come from Numbers Protocol and share the same secure backbone. Capture Cam is the original Web3-native camera with NFT minting, multi-chain support, and decentralised storage — built for crypto creators. ProofSnap is purpose-built for journalists and frontline storytellers — minimal UI, instant proof, no crypto learning curve.
Does ProofSnap work without internet?
Yes. C2PA signing happens entirely on-device. ERC-7053 registration and x402 endpoint creation are queued and submitted when you reconnect. You can capture in airplane mode and never lose a single piece of provenance.
Can I prove a photo was taken at a specific time and place?
Yes. ProofSnap signs the C2PA credential with a trusted timestamp and (optionally) GPS coordinates the moment you press the shutter. The signature is verified by any C2PA-compliant viewer (Adobe, Microsoft Edge, browsers) and is anchored to the chain immutably.