Nostr Web Client

Why don't they just have a database that you can verify against? I'm not sure what good a blockchain is.

Hype marketing. They could just serialize it and track sales in a publicly available database. And that's probably all their 'blockchain' is anyway.

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And even this could probably be bypassed

True

Even simpler, they could just sign the CoA with their private key.

I think any of it could be bypassed. You can copy a paper CoA.

Some embedded RFID thing that's signed would probably be harder.

NFC I mean. I'm in work mode 😂

Why not just put this piece of paper in the box and do nothing else?

Ask them.