Use case
Blockchain Timestamps for Photographers
EXIF data can be stripped or faked in seconds. A blockchain-anchored timestamp can’t. Here’s how working photographers use ProofAnchor to protect their catalog and prove authorship.
The problem with EXIF data
Every JPEG and RAW file embeds camera metadata in its EXIF headers: capture timestamp, GPS coordinates, camera model, lens focal length. This feels like proof of authorship. It’s not.
EXIF data can be modified by anyone with free software in under 30 seconds. Social media platforms strip it on upload — your Instagram post has no EXIF data. Cloud storage services often strip it too. In a dispute, EXIF data is useful background but not cryptographically verifiable evidence.
A blockchain-anchored SHA-256 hash is different. It binds to the exact file bytes. Remove one pixel, change one metadata value, apply any post-processing — the hash changes and the match breaks. The on-chain record is permanent. Nobody’s stripping it.
How photographers use it in practice
Anchor RAW files before client delivery
After a shoot, anchor the RAW files before delivering processed JPEGs to the client. The RAW anchor proves you had the original, unedited files on that date — before any dispute about ownership, edits, or licensing could arise.
Document before social posting
Anchor before uploading to Instagram, 500px, or your portfolio. Instagram strips EXIF on upload. Your anchor is proof the file existed before the platform ingested it — timestamps the pre-publication version that the platform will never see.
Prove work predates AI training cutoffs
AI image generators train on data collected up to a cutoff date. If your images were scraped into a training dataset, a blockchain anchor proves the images existed before that cutoff. This is increasingly relevant in AI training dispute proceedings.
Protect speculative or unreleased work
Concert photos not yet submitted to publications. Wedding previews before the final gallery is delivered. Personal work you intend to license later. Anchor the files now while they're still pre-commercial.
Support licensing disputes
When a publication or client claims they have rights they don't, or denies using an image, the timestamp establishes when the specific file existed. Combined with delivery records and metadata, it builds a timeline that's hard to argue against.
Does this replace copyright registration?
No — and it doesn’t try to. Copyright exists automatically in the US when you press the shutter. Registration gives you access to statutory damages and attorney’s fees in litigation. A blockchain timestamp gives you a cryptographically verifiable proof of prior existence.
Most photographers benefit from anchoring everything and registering their commercial catalog quarterly or per-project. Anchoring is cheap enough to do on every shoot. Registration is the strategic investment you make on the work you intend to monetize or defend in court.
What ProofAnchor does with your files
Nothing. The file never leaves your device. SHA-256 hashing runs locally in your browser. Only the 64-character hash is transmitted and anchored to the Polygon blockchain. It’s mathematically impossible to reconstruct the original image from its hash.
Every proof gets a public verification URL at proofanchor.com/verify/<id>. Anyone — including opposing counsel, clients, or publications — can verify the timestamp without creating an account or trusting ProofAnchor’s servers. The offline verification tool (pip install verify-proof) checks directly against the Polygon blockchain.
Pricing
The free tier includes 5 lifetime proofs — enough to test the workflow. Pro ($9.99/month) covers 50 proofs per month. Business ($49.99/month) covers 500 proofs per month with bulk upload and API access for automated workflows.
A photographer anchoring 5 shoots per month of 20 RAW files each (100 files) fits comfortably on the Pro plan.