Watermarking & the audit log

MeetCrew makes its output verifiable and its compliance record durable. Synthetic speech is watermarked, stored artifacts carry content credentials, and every compliance event is written to a tamper-evident log.

Marked output

Every segment of synthesized speech a teammate produces carries an inaudible audio watermark, sealed at the moment of synthesis so the mark stays inside MeetCrew’s trust boundary. The banner and the watermark are applied fail-closed: a video frame without its banner is never sent, and a speech segment without its watermark is never sent.

Content credentials on stored artifacts

Artifacts MeetCrew produces on its own side — transcripts, recordings, exports — carry C2PA-style content credentials signed with a MeetCrew key. Anyone downstream can check that an artifact came from MeetCrew and has not been altered. The watermark marks live synthesized audio; the credentials seal the stored record.

The audit log

Disclosures, opt-outs, and deletions are written to a hash-chained, tamper-evident audit log. Each entry links to the one before it, so any alteration breaks the chain. The chain is re-verified nightly, and it is fail-closed: a broken link raises an alert and is never silently overwritten. The content of an opted-out meeting is gone, but the fact that the opt-out happened — with its timestamp and the invoking speaker — is retained.