The subscribing witness must prove that the person whose name is subscribed to the instrument as a party is the person described in it, and that such person executed it, and that the witness subcribed his name thereto as a witness.
Cal. Civ. Code § 1197
Proof and Acknowledgment of Instruments
Enacted 1872.
Official source: California Legislative Information. Reproduced from public-domain California statutes; confirm against the official source for the current text. Not legal advice.