Record "when I published it" on a third-party ledger

Send only the hash (fingerprint) of a text, photo or page and get a timestamp record. Your content is never uploaded. Free, no sign-up.

1. Choose a text or a file Paste text here (hashed inside your browser) or a file: or enter a SHA-256 directly:

How it works

Your browser computes the SHA-256; only the hash is sent. We never store text, images or URLs.
You immediately get a signed time stamp (RFC 3161) from this service.
It is also sent to OpenTimestamps public calendars and is anchored in a Bitcoin block within hours. After that it can be verified from the Bitcoin ledger alone, even if this service disappears.

FAQ

What does it show?
It is one piece of evidence on a third-party ledger that data matching this hash existed at the recorded time. It does not show that the content is true or who made it.

Is my file uploaded?
No. Hashing happens inside your browser.

What if I edit the article?
Any change alters the hash, so record each revision (the WordPress plugin does it automatically).