Orphograph Receipt
Empirical Notary
Orphograph
Empirical Notary
Orphograph
Empirical Notary
Orphograph
Empirical Notary
Orphograph is an empirical notary.
We cryptographically prove a file existed by a certain time,
anchor that proof in Bitcoin, and make it independently verifiable.
Orphograph Receipt
Empirical Notary
Orphograph
Empirical Notary
— receipts issued the public ledger →
Drop it below. It is hashed on your device; only the fingerprint travels. A receipt comes back with the time it existed, anchored in Bitcoin.
Anchor a fileLogs can be edited after the fact. A receipt cannot. Give each piece of agent output a dated, independently checkable record before it is handed over.
Install the MCP serverAsk for the receipt with the deliverable. Verify it yourself with open-source tools — no account with us, no trust in us.
What to ask forPowered by the OpenTimestamps network.
Committed on-chain for censorship resistance.
Anyone, anywhere can verify your proof.
Your file stays on your device. Only its fingerprint is submitted.
Auditable. Reproducible. Built for truth.
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.
Your file never leaves your computer.
A SHA-256 hash is generated locally.
Using 5 independent OpenTimestamps calendars.
The combined proof is committed to the blockchain.
Keep it. Share it. Verify it. Forever.
Orphograph
Empirical Notary
This receipt is your cryptographic proof that the file existed by the time stated.
Verify anytime at
orphograph.com/verify
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.
Timestamp calendars
a·pool b·pool alice finney catallaxyOrphograph
issues the instrument
The receipt, the proof files, and the office that prepares them.
OpenTimestamps
constructs the proof
An open standard aggregates fingerprints into a Merkle tree (RFC 6962).
Bitcoin
provides permanence
The tree's root is committed to a public chain no company controls.
The office may disappear.
The evidence does not.
Receipts verify with open-source tools, without our cooperation.
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 →Version history. A revision can now be anchored so that it commits to the prior draft’s receipt, and the receipt page shows the chain — draft two provably committed to draft one. The chain proves the order of commitment only: never what changed, when the edit happened, or who made it. Like every receipt, it verifies with our service gone. Notes for integrators →
Receipts for agent output. AI agents anchor what they produce through the MCP server or the agent-output counter — the same portable, Bitcoin-anchored proof of when, issued to software. How operators use it →
Coming: pay-per-anchor over Lightning for agents — no account needed. Not yet open; the schedule of fees will record it the day it is.
Free · No account · Verifiable without Orphograph.