Make a permanent, tamper-evident record of your photos, documents, or work — the file never leaves your device.
An empirical notary. Drop a file in your browser; receive a Bitcoin-anchored fingerprint that records it existed by no later than the next block. The file itself never leaves your machine.
Free · No account · The file stays on your device.
What this means for you
A photograph you took on your phone or camera. Drop it at the counter; the office anchors only the fingerprint, and the file itself never leaves your device.
A folder of photographs from one event — a wedding, a site visit, a long afternoon. One receipt covers the whole folder, and any single photograph can later be checked on its own.
A document or contract in its final form. The receipt records that exact wording existed by the recorded block, with no later edits.
A spreadsheet or set of records that closes a period — a month, a quarter, a season. Each row stays exactly as you saved it.
An audio recording or interview, in the original file your device produced. Length and format do not matter — the same privacy contract holds.
Five steps. The file is never uploaded. Only its fingerprint crosses the counter.
SHA-256 and SHA-512 fingerprints..ots proof files.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.
Stored locally. Anyone with the receipt URL can view it; nothing identifies you to us. Clear browser data to remove this list.
7KViBg91CR8D4mTrA timestamped self-anchor issued by the office, committed to five OpenTimestamps calendars and the Bitcoin chain.
Verification works without our servers. Source code under MIT.
Orphograph records, in a manner mathematically permanent and independently verifiable, that a file existed on or before a specific block of the Bitcoin blockchain. It issues no opinion on authorship, ownership, or legality. It issues only the fact.
Only the SHA-256 fingerprint — a 64-character one-way number. The file remains on your machine. The office cannot reconstruct, identify, or transmit it.
Bitcoin has not reorganized beyond a handful of blocks in sixteen years. A block from an hour ago is, for any practical purpose, immutable. We commit to that chain via OpenTimestamps.
Every receipt. If this service ever ceased, your .ots proof files would continue to verify against the public chain using open-source software. The instrument outlives the institution.
The office issues the same instrument regardless of profession. Among those who have anchored or would reasonably anchor are practitioners of the following crafts — by no means an exhaustive list.
The instrument is the same in every case: a Bitcoin-anchored attestation that a file with a particular fingerprint existed by the recorded block. Its evidentiary weight is a matter for the practitioner and, where relevant, counsel.
Free tier resets every twenty-four hours by the server's clock. Paid tiers verify identically — same calendars, same chain.
For trying it out, for occasional creators. Perpetual.
No account · no card · file stays on your device.
The entry pack. For writers, journalists, anyone proving a draft predated something.
For working creators with a backlog. Best value per anchor.
9 cryptos accepted (BTC, USDC, ETH, SOL, USDT, LTC, XRP, DOGE, MATIC) · non-custodial via NOWPayments
For working creators and small teams. Cancel anytime.
Crypto bills as a Pack of Fifty for equivalent value. Recurring crypto coming.
Already used a Bitcoin-anchored receipt to settle a dispute? Write to the office. The office keeps a public record of real-world uses where the customer consents to publication; the receipt itself is yours.
Three levels of trust, from one-click to fully trustless. The math is the same. The level of paranoia is up to you.
Each receipt has a public URL at /r/<id>. Drop the original file; the page re-hashes locally and reports match.
A small standalone tool, on your computer. Talks to the OpenTimestamps calendars. Tells you pass or fail. We don't see it run.
How →Use the OpenTimestamps client against your own Bitcoin node. Orphograph is not in the loop. Math and proof-of-work are the trust surface.
How →Shown in your local time, UTC, and every IANA time zone the browser knows.