possiblymadebyahuman

About

possiblymadebyahuman records the shape of a writing process. It allows you to claim authorship over a text by signing the time series of keypresses, without actually looking at your text. You cannot really prove that it was a human who wrote it, but you can prove that the writing pattern is consistent with you being a human.

When you focus an empty textarea or plain text input on a page, the extension starts recording the shape of your editing as a content-blind event log: insert/delete/replace positions and lengths in Unicode codepoints, timing, and source attribution such as typing, paste, drop, cut, IME, autocomplete, or unknown when the browser reports it.

Existing non-empty fields are not recorded, so the extension does not silently snapshot a draft you started elsewhere. Nothing leaves your device while you write.

When you click Sign & upload in the popup, the extension builds a public content-blind writing record from the events: codepoint-anchored process metadata plus a BLAKE3 hash chain over the event sequence. The public service stores that record and returns a short URL you can share. The returned URL is copied to your clipboard.

Public records do not contain your document plaintext or per-event inserted text. The capture context, such as page URL with query and fragment stripped, page title, and field kind, is shown for review before upload and can be edited or removed.