On the PoW model, in order to find the proper network all you need is the address of a single correct node. You're able to identify the proper network by simply picking up the one with the most accumulated computing power.
On the PoS model, the solution isn't as obvious to me. It seems that, in order to find the proper network, you must absolutely trust whoever gave you the IP of a node. That seems to put a "trust" barrier on network entrance.
Am I missing something, is there any clever trick to solve this issue?