Except that a blockchain is the exact wrong technology to use here. Look at Bitcoin, for example. That blockchain is entirely controlled by manufacturers in C

Except that a blockchain is the exact wrong technology to use here. Look at Bitcoin, for example. That blockchain is entirely controlled by manufacturers in China. How would this blockchain viably guard against manufacturers in China? Besides, the blockchain or other storage mechanism is irrelevant. All the counterfeiter needs to do is copy the serials or other numbers from the blockchain or wherever they are stored. These methods all make it easier to pass-off a counterfeit as legitimate.