How do I prove I created my artwork or photo before someone else claimed it?

The cryptographically defensible method is to anchor a SHA-256 hash of the file to a public blockchain before the work is published or shared. ProofAnchor does this by computing the hash locally (the file itself never uploads) and writing it to the Polygon blockchain, producing an immutable timestamp anyone can verify. This establishes that your specific file existed at a specific time, predating any later claim.

Is copyright registration required for a blockchain timestamp to have legal weight?

No. Copyright exists automatically under US law the moment an original work is fixed in a tangible medium. Copyright registration is required to sue for statutory damages, but not to prove authorship or timing. A blockchain-anchored timestamp is independent evidence of when a specific file existed, which can strengthen a copyright claim whether or not the work is registered.

Does ProofAnchor work for photos, music, video, and documents?

Yes, any file type. ProofAnchor anchors the SHA-256 hash of the file bytes, so the file format is irrelevant. It works identically for JPEG/RAW photos, WAV/MP3 music files, MP4/MOV video, PDF/DOCX documents, and source code.

Does 'poor man's copyright', mailing yourself a sealed envelope, actually work?

No. The US Copyright Office has explicitly stated it offers no legal protection. The postmark binds to the envelope, not the contents, so the method cannot mathematically prove what was inside on a given date. A blockchain-anchored hash is different: the hash uniquely identifies the exact file bytes, and the on-chain record proves the hash existed at a specific time.

Can I verify a ProofAnchor timestamp without trusting ProofAnchor?

Yes. The verify-proof Python package (pip install verify-proof) performs verification offline by hashing the file locally and comparing it against the on-chain record directly. ProofAnchor's servers are never involved in verification, the proof is independently checkable against the Polygon blockchain by anyone.

How is this different from watermarking or EXIF metadata?

Watermarks and EXIF data live inside the file, so they can be modified, stripped, or re-embedded by anyone with access to the file. A blockchain anchor is external: the SHA-256 hash is recorded on a public ledger independent of the file itself. Alter the file in any way and the hash no longer matches the on-chain record.

When You Need to Prove You Created Something First: ProofAnchor

A photographer posts their street photography series on Instagram. Three weeks later, they see the exact same composition in a stock photo site, credited to someone else. The dispute comes down to one question: who shot it first?

This isn't hypothetical. It's happening right now as AI makes copying easier and proving original creation harder. You need blockchain timestamping: an immutable record that proves when your work existed. ProofAnchor does exactly that, anchoring your file's cryptographic fingerprint to the Polygon blockchain the moment you upload it.

Here's how it works. You drag your photo into ProofAnchor. The system creates a SHA-256 hash of your file. A unique fingerprint that changes completely if even one pixel gets altered. That hash gets written to the Polygon blockchain with a timestamp. Your file never leaves your device. Only the mathematical proof goes on-chain.

The result? Permanent, independently verifiable proof of existence. Anyone can check the blockchain record. Courts can verify it. Copyright offices can reference it. The timestamp can't be faked, backdated, or deleted because it's distributed across thousands of blockchain nodes worldwide.

Traditional copyright registration takes weeks and costs money. ProofAnchor takes seconds and starts free. Both serve different purposes. Copyright gives you legal protection, while blockchain timestamping gives you proof of when you had the work first. Smart creators use both.

The AI problem makes this urgent. Large language models and image generators train on everything they can scrape. Your unpublished novel, your portfolio shots, your demo tracks. They're all potential training data. When AI outputs something suspiciously similar to your work, proving prior creation becomes your only defense.

C2P1 content credentials help here too, but they're fragile. Upload a photo to most social platforms and the embedded credential gets stripped. Your blockchain timestamp stays permanent regardless of what any platform does to your file.

ProofAnchor works for any digital file. Writers timestamp manuscripts before sending to beta readers. Musicians anchor demos before sharing with labels. Developers prove code authorship before open-sourcing. Photographers lock in timestamps before client presentations.

The process costs almost nothing. Polygon transactions run pennies, not dollars. You get immediate proof without waiting for bureaucratic approval or paying recurring fees.

This isn't about paranoia. It's about having options when disputes happen. Maybe that photographer could've avoided months of legal back-and-forth with a simple blockchain record showing they had the shot first. Maybe the stock photo thief would've thought twice knowing the real creator had immutable proof.

Proving you created something first shouldn't be complicated. Upload your file, get your blockchain timestamp, keep working. When someone claims they had your idea first, you'll have the receipt that matters.

The question isn't whether you'll face a creation dispute. It's whether you'll have proof when you do.