Hey Product Hunt! 👋

I'm Tadeu, the maker of Docmint.

It started with a simple, annoying question: "How do I prove I had this file first?"

A designer friend had a layout copied by a client, and all she had were file dates

that anyone could edit. The usual answers were a notary (slow, expensive, and you

hand over your document) or emailing it to yourself (not much proof at all).

So I built Docmint:

🔒 Your browser computes the file's SHA-256 fingerprint. The file itself is never uploaded.

⛓️ That fingerprint goes into a smart contract on Base (an Ethereum L2). The block date

is the timestamp, and nobody can edit or delete it, not even us.

🧾 A PDF receipt with a QR code lands in your inbox. Anyone can verify the file at

docmint.app/verify, and every result shows how to check it without Docmint

(BaseScan → tokenURI → IPFS), so the proof outlives us.

▦ Each file also gets a visual fingerprint: an 8×8 print drawn from its hash.

Change one character and the whole picture changes.

No wallet and no crypto: sign in with Google or email and pay by card (or Pix in Brazil).

Batches of up to 200 files go in one transaction, and each file keeps its own Merkle proof.

Who it's for: designers, writers, musicians, developers, researchers, and anyone who

sends work to clients before signing a contract.

To be upfront: Docmint isn't a notary and doesn't replace copyright or trademark

registration. It's independent technical evidence that complements them.

🎁 Every new account gets 3 free records, and PRODUCTHUNT takes 30% off any credit pack this week.

Next up: a REST API with webhooks, so you can record and verify from your own systems.

I'd love your feedback, especially on what you'd want to protect first. I'll be here all day!