Yandex Qrator Labs Internet Initiative Japan & Arrcus Arrcus Fastly USA National Institute of Standards and Technology This document defines the semantics of an Autonomous System Provider Authorization object in the Resource Public Key Infrastructure to verify the Border Gateway Protocol (BGP) AS_PATH attribute of advertised routes. This type of AS_PATH verification is primarily intended for detection and mitigation of route leaks. It also to some degree provides protection against forged-origin prefix hijacks.