Well sure but that's the "analog gap" problem. NFTs don't fix that, do they? In the end there'll have to be something that will tie a given NFT to a given watch, and one way or the other it'll be the same issue as tying my CSV to a given watch.
I agree, one can’t easily tie an NFT to a physical object. Nothing guarantees that the watch and NFT change ownership in tandem.
All I’m saying is that a serial number doesn’t really prove anything because it’s trivial to copy. A private key inextricable from the object would be better, because it could generate timestamped signatures as proof.
Yes. I regret not being more clear in my original comment, because the scheme I alluded to is an application of public key cryptography, such as Certificate Authorities, and is not about cryptocurrencies specifically.
The point of a signed timestamp (and/or challenge string) is that it demonstrates the signature is freshly generated, proof that the device is authentic right then and there. An old copied signature would not have this property.
