Orphograph
Proof · Permanence
Est. 2026
Your browser hashes the file locally. Only its fingerprints are submitted. You receive a portable receipt anchored through OpenTimestamps to Bitcoin and independently verifiable by anyone.
Free · No account · The file never leaves your device.
Hashed locally. Only the fingerprints are submitted.
Anchors don't charge anything until you buy a Pack. The free tier is permanent.
First time?
Every file is hashed locally. One receipt covers the whole folder. Any one file later verifies independently with a small inclusion proof. Anchoring a dataset? →
Stored locally. Anyone with the receipt URL can view it; nothing identifies you to us. Clear browser data to remove this list.
Your browser hashes the file. The file itself is never transmitted.
Fingerprints go to multiple OpenTimestamps calendars for redundancy, later attested by a Bitcoin block.
Downloadable proof files check with open-source software, independently of Orphograph.
XwTULwlh76PcCst9Confirmed · 5/5 calendars · Bitcoin-attested
A real receipt. Open it, drop the original file, and watch it match — no account, no trust in us required.
Every dispute reduces to one question — who holds the older, independent record. Anchor the file today and you are always the one who can.
Why it matters →The file is never uploaded; only its fingerprint crosses the counter. Read the five-step method and the mathematics behind it.
The procedure →Photographers, writers, engineers, auditors — anyone whose work has a date worth proving. One instrument, whatever the craft.
Whom it serves →An empirical notary, nothing more: it records that a file existed, and issues no opinion on authorship, ownership, or legality.
The office →Free · No account · Verifiable without Orphograph.