Cisco Systems, Inc. Cisco Systems, Inc. Huawei Network.IO Innovation Lab Seconize JP Morgan Chase Several technologies such as Traffic Engineering (TE), Service Function Chaining (SFC), and policy based routing are used to steer traffic through a specific, user-defined path. This document defines mechanisms to securely prove that traffic transited said defined path. These mechanisms allow to securely verify whether, within a given path, all packets traversed all the nodes that they are supposed to visit.