(1) Before payment of compensation to a beneficiary who is not residing within the United States, satisfactory proof of the relationship as to constitute a beneficiary under this chapter must be furnished by the beneficiary, authenticated under seal of an officer of a court of law in the country where the beneficiary resides. The proof is conclusive as to the identity of the beneficiary, and any other claim of any other person to any compensation is barred from and after the filing of the proof.
(2) Payment of compensation to a beneficiary not residing within the United States may be made to any plenipotentiary, consul, or consular agent within the United States representing the country in which the nonresident beneficiary resides, and the written receipt of the plenipotentiary, consul, or consular agent acquits the employer or the insurer.