I. Introduction
Network slicing in 5G networks [1] is designed to utilize resources from different Internet infrastructures to satisfy the Quality of Service (QoS) requirements from users, of which one of the most common applications is to provide dynamic content delivery paths across various infrastructures for users of different service levels. To guarantee promised services as well as enforce correct orders of network operation, network infrastructure operators ought to deploy path validation protocols in such tasks especially when they do not trust but have to work with each other. Path validation enforces packets to be delivered on agreed paths and verifies whether delivery contracts are properly fulfilled afterwards [2].