Hashed on your device
Your file never leaves your device. The SHA-256 hash is computed locally and that's all that gets sent.
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Photon
Your work, protected forever. Take a photo or pick a file, tap Stamp, and Photon creates proof that this exact file existed right now.
Free on the App Store and at photon-rs.com. No crypto wallet needed.
Why Photon?
Because "I made this first" shouldn’t require a lawyer.
Whether you’re a student submitting an assignment, a designer protecting a concept, or a developer shipping code, there are moments when you need to prove that your work existed, unchanged, at a specific point in time. Photon does that. One drag, one stamp, one permanent record you can verify independently.
How it works
Anchored for good
The hash is stamped into a public record via OpenTimestamps. Permanent, public, and tamper-proof.
Instant verification
Drop any file into Verify to confirm its hash matches the record on chain. No account needed.
Tag and search
Add #tags to your stamps so you can find your work years later. Your own searchable archive.
Any file type
Documents, code, images, audio. If it's a file, Photon can stamp it. Up to 20 MB per file on the free tier.
Your data, full stop
No selling your file list. No mining your metadata. Your stamp history is yours.
Now live
Stamp your first file in 30 seconds.
Free on the App Store and at photon-rs.com.
Scan for the iPhone app