Certify

Stamp your work in under a minute.

Drop a file. Fill the legal record. We hash it in your browser, anchor the hash to Bitcoin and a qualified RFC 3161 timestamp authority, and issue a certificate. Your file never touches our servers.

📄

Drop a file here or click to choose

Any file. Hashed locally — never uploaded.

SHA-256 hash

File

Size

Required

Title *

First name *

Last name *

Country of residence *

Work type *

Original language (if textual)

Date of creation *

When the work was completed (may differ from today).

Visibility

List in registry · author visible

Your name appears on the public certificate. Note: your name is personal data — visible to anyone with the certificate ID. Best SEO and provenance signal.

List in registry · author hidden

Only the work data is shown publicly; your name and contact stay private. After certifying, you can add an anonymous contact relay so people can still reach you (€12/year or €34 lifetime).

Do not list (not recommended)

Verifiable only by people who hold the certificate ID. Not searchable, not indexed. Reduces evidentiary value of public provenance.

Add more for stronger evidence ↓

Author summary (≤500 chars)

Genre / category

Created in (city / country)

Ownership / rights

Client / commissioner (for work-for-hire)

Co-authors

One per line: Name, email, share% (e.g. Jane Doe, [email protected], 50)

Identity hash (advanced)

Optional SHA-256 of an identity document for evidentiary identity binding. The document itself never leaves your device — paste the hash only if you've computed it elsewhere.

✓

Certified.

Your work is now timestamped on Bitcoin and signed by a qualified TSA.

Certificate ID

Version

Download PDF View public cert Manage in dashboard

Add anonymous contact relay

Your name is hidden from the public certificate. Want people to still be able to contact you (publishers, agents, lawyers, buyers)? Activate the relay — we forward inquiries to your private email without revealing your identity.

€12 / year €34 lifetime

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