California Code, Probate Code - PROB § 3802

(a) The nonresident fiduciary shall produce and file one of the following certificates:

(b) In the case of a foreign country, the certificate shall be accompanied by a final statement certifying the genuineness of the signature and official position of (1) the court clerk making the original certificate or (2) any foreign official who has certified either the genuineness of the signature and official position of the court clerk making the original certificate or the genuineness of the signature and official position of another foreign official who has executed a similar certificate in a chain of such certificates beginning with a certificate of the genuineness of the signature and official position of the clerk making the original certificate. The final statement may be made only by a secretary of an embassy or legation, consul general, consul, vice consul, or consular agent of the United States, or a diplomatic or consular official of the foreign country assigned or accredited to the United States.