What does this actually solve? If you are surreptitiously adding chips to a motherboard, you'd just do it between whatever steps are written to the blockchain.

What does this actually solve? If you are surreptitiously adding chips to a motherboard, you'd just do it between whatever steps are written to the blockchain. Even if you can totally secure the factory, you can just redirect the parts in shipping. I think "insurmountably hard problem" is a fair description.