That will always be the case, but given the ease of tracking all the transactions in the chain, you can find the point at which the product deviates. Of course,

That will always be the case, but given the ease of tracking all the transactions in the chain, you can find the point at which the product deviates. Of course, if every step on that chain has colluded, and produced false attestations, then there's no defense against that. But then, if all parties are coordinating then they've created their own supply chain independent of the one being tracked.