This is the same prompt the extension presents before proving. Choose an origin, a field, and a threshold. The preview on the right is what a verifier receives. Nothing is transmitted until the proof is complete.
In the extension, this sequence runs locally. Timings are typical for a laptop.
Origin sees a normal browser request.
Notary never sees plaintext.
Everything else is discarded from the witness.
Runs in a web worker. No network activity.
Gas is paid by the holder. Credential is minted to the holder address.