Pressmarkthe printing press for the web

Write it. Seal it.
It stays finished.

Online articles can change after you read them, often without saying so - and AI made content endless. Pressmark is an experiment in the opposite: editions that get a number, a date and a seal - and are corrected only in the open, by errata.

Print an edition Read the demo edition

How the press works

1

Write. Say the thing once, properly. A title and a body, like a page of a magazine.

2

Print. Your edition gets a number, a date, and a seal - a cryptographic fingerprint of its exact words, computed in your browser.

3

Correct in the open. A printed edition is not rewritten. If it was wrong, you add an erratum - dated and visible - under the original text.

An honest experiment

This is an experimental demo. Editions you print are stored only in this browser, on this device - no accounts, no uploads, no tracking. The seal lets you check whether a copy still matches the words that were sealed. It does not prove who wrote an edition or when, and it cannot stop deletion or replacement of a local copy. Finality here is a habit worth testing, not a technical guarantee.

Scholarship already works this way - journals use versioned records and Crossmark updates, arXiv keeps every version, and a sent email can never be edited. The open question Pressmark tests: do writers and readers want that same feeling of finished on the everyday web?