California Code, Civil Code - CIV § 1199

The evidence taken under the preceding section must satisfactorily prove to the officer the following facts:

One. The existence of one or more of the conditions mentioned therein;  and,

Two. That the witness testifying knew the person whose name purports to be subscribed to the instrument as a party, and is well acquainted with his signature, and that it is genuine;  and,

Three. That the witness testifying personally knew the person who subscribed the instrument as a witness, and is well acquainted with his signature, and that it is genuine;  and,

Four. The place of residence of the witness.