Proof, sealed.

A file's fingerprint, pressed into the public ledger — and verifiable for as long as the chain endures.

Scroll

Your browser computes the fingerprint locally. Only the fingerprint — never the file — crosses the counter.

II.

A one-way hash, committed through five independent calendars to a block that cannot be quietly rewritten.

III.

It verifies against the chain itself. If we vanish, the proof remains. Don't trust us — check the chain.

PERMANENCE

Sixteen years of an unbroken ledger, working for you.

2009 — ∞

The record

One page. Verifiable forever.

A few things that cross the counter

MANUSCRIPT

Priority, ghostwriting, estate, attribution — every dispute reduces to who holds the older, independent record.

Verify against the chain →

THE NEGATIVE

A dated record of the file in those exact bytes — independent of any platform, any client, any later claim.

Verify against the chain →

THE DATASET

Pre-print and reviewer logs live inside an institution. The chain does not.

Verify against the chain →

THE LEDGER

What was signed, when — pressed into a record neither party can quietly revise.

Verify against the chain →

~ one hour to the block

The empirical notary

Free for three a day · No account · The file stays on your device