A client says you delivered late, or that the work "wasn't what we agreed." Hashstamp gives you a tamper-evident receipt for the exact file, at the exact moment — that they can verify themselves.
Works with anything you can upload: contracts, designs, manuscripts, code, invoices, deliverables. If it's a file, you can stamp it.
Drop in a file. It's hashed in your browser — the file never leaves your device. You get a real, verifiable timestamp on the ZKNOT chain.
You don't have to take our word for it — and neither does your client. The proof checks itself.
Drop in the deliverable — a PDF, a design, a contract, a zip. We never store the file itself, only its cryptographic fingerprint.
You get a timestamped, tamper-evident proof: the exact file fingerprint, sealed at the exact moment, recorded on an append-only chain.
Hand your client a link. They confirm the file and the date themselves — no account, no login, no calling you. The math does the vouching.
Anything you control, a client can argue you faked. The point of proof is that it doesn't depend on you.
We're onboarding the first batch of freelancers and studios now. Reserve early access and lock in founder pricing.
No. We compute a one-way fingerprint (a SHA-256 hash) of your file and store only that. We never see or keep the file's contents — we couldn't reconstruct it if we tried.
Hashstamp gives strong, independently verifiable evidence of when a specific file existed and that it hasn't changed since. Whether that's decisive in a given dispute depends on the situation — but "here's cryptographic proof, verify it yourself" is a much stronger position than "trust me, I sent it on time."
They see a verification page: the file fingerprint, the timestamp, and a confirmation that it's intact. They never see your account or anything else you've stamped. One link, one proof.
An append-only, hash-chained ledger with hardware-rooted attestation — the same infrastructure behind ZKNOT's evidence systems. You don't need to understand any of that. You upload a file; you get a proof.