The definitive proof
that you had it first.
No credit card. Sign in with Google or email.
Simulate a file being tampered with
Change any letter below and watch the document's fingerprint change completely
File intact
- SHA-256
- Base network · Ethereum L2
- IPFS
- Open verification
How it works
Three steps. A few seconds.
All the cryptography happens behind the scenes. You just pick the file.
- 01
Local fingerprint
Your browser computes the file's SHA-256 hash. Only that 64-character code moves on; the content stays with you.
- 02
Anchored on-chain
The hash is written to a smart contract on the Base network. The block records the date and time publicly and permanently.
- 03
Verifiable receipt
You get a PDF receipt with a QR code. Anyone can check the file's authenticity, at any time.
Why Docmint
Simple on the outside. Rigorous inside.
Full privacy
Your file is never sent to our servers. Contracts, designs and trade secrets stay with you.
Tamper-proof
Changing a single bit changes the hash completely. The proof can't be edited or deleted — not even by us.
Ready in seconds
No queues, paperwork or travel. Record and receipt in under a minute, any time.
Independent of us
The proof lives on a public blockchain. Even if Docmint ceased to exist, it would remain verifiable.
Who it's for
Built for creators and anyone who needs to prove it.
Legal
Contracts, agreements, opinions and digital evidence with a proven date.
Learn moreArchitecture & engineering
Plans, projects and 3D models recorded before you pitch them.
Learn morePhoto & video
Prove authorship of originals before publishing or sending for approval.
Learn moreMusic
Lyrics, scores, beats and demos protected before release.
Learn moreDesign & illustration
Brand identities, illustrations and artwork with proven precedence.
Learn moreSoftware
Source code, algorithms and technical docs with a timestamp.
Learn moreComparison
A modern way to prove precedence.
For evidence of existence and integrity, technology does in seconds what used to take days.
DocmintDocmint does not replace notaries, trademark or copyright registration. It is independent technical evidence that complements them.
FAQ
Everything you need to know
Do you have access to my files?
No. The hash is computed in your browser and the file is never uploaded. We only record the fingerprint plus the title and description you choose — those two are public.
Is it legally valid?
It's technical evidence that that exact file existed on a given date, and courts in many jurisdictions accept digital evidence. It has no notarial authority and doesn't replace a notary or IP registration; for specific cases, ask a lawyer.
Do I need crypto or a wallet?
No. Sign in with Google or email and we create a secure wallet automatically. Network fees are on us and you pay by card.
What if I change the file later?
Any change produces a different hash, so the modified file won't match the record. Keep the original intact. Renaming the file doesn't matter.
Can I record several files at once?
Yes. In a batch, files form a Merkle tree written in a single transaction, and each file remains individually verifiable. Each file uses one credit.
What if Docmint goes away?
Your proof stays valid. It lives on a public blockchain and anyone can check it with the original file and the receipt. See How it works for the step by step.
Protect your next file right now.
Create your account in seconds and get 3 free records.