Sealed at acquisition in ZEN, carried inside the CZI file, checked by an open verifier. We found no cryptographic seal on the public ZEN and CZI pages; the pull comes from the journals.
First door: a partnership at the sensor, starting with one ZEN build and one open verifier.
Do not take our word for it. The open verifier and the evidence page are public: verifier · evidence · Proof of Agent Work.