The proof layer for independent work

Ship the work.
Show the receipts.

Cothenticity records how your work was actually made — real hours, real revisions, and exactly what AI touched — then seals it into a tamper-evident receipt you send with the deliverable. Provenance, not policing.

Capture runs 100% in your browser · nothing stored until you publish · SHA-256 sealed
Designers·Writers·Developers·Studios·Agencies
🏆

Win the bid

In a stack of identical proposals, the one with proof of craft reads different. Attach a receipt and make everyone without one look like the risk.

🔒

Own your data

Capture is local-first: edit positions, timing and origin — never your words. Nothing leaves the page until you hit publish.

⛓️

Impossible to fake quietly

Every keystroke event folds into a SHA-256 hash chain, re-verified by the server on publish. Change one record and it fails loudly.

🤖

AI disclosed, not hidden

AI assists are first-class, character-level events — the disclosure trail EU AI Act Article 50 now expects, built into the work itself.

Sixty seconds, start to sealed

  1. 1
    Write in the StudioType, paste, and use the built-in AI assist. The engine attributes every character to human, AI, or paste — live, on your machine.
  2. 2
    Seal & publishOne click seals the session. The server independently replays the entire hash chain before accepting — receipts that don't verify are rejected outright.
  3. 3
    Ship the linkYour receipt gets a public URL that travels with the deliverable. Anyone can re-verify it — try the tamper demo and watch a forged receipt fail.
REC
chain: genesis

Live session

0:00
active time
0
keystrokes
0
revisions
100%
human-authored

Composition

Human 0 AI 0 Paste 0

Event feed

--:--Session armed. Waiting for input…

Your receipts

Every receipt you've published from this browser, with live view counts. Keys are held on this device only — there's no account, and no way for us to recover them.

0published
0views

—

—
⏳ Verifying chain…
—
active work time
—
revisions captured
—
keystrokes
—
human-authored

Composition · character attribution

Effort curve · characters changed per interval

Making-of replay

—

Disclosed events

Integrity

chain head—

Every deliverable you send could carry one of these.

Cothenticity records how the work was made and seals it. Free, no account, runs in your browser.

Verify a receipt

Paste receipt JSON below — or a receipt link or id. The verifier replays every logged event through the SHA-256 chain and compares the result to the sealed chain head. Any edit — a changed timestamp, an added character count, a deleted AI disclosure — breaks it.

✔ Chain intact