Every NFT is signed by qrpaper.sats domain name, no one can copy it.
but qrpaper.sats what is that? it's not even a website you can view so i guess it doesn't mean anything.
*.sats is doman name support by Ordinals protocol, qrpaper.sats point to the qrpaper project address, and every qrpaper NFT is signed by the address private key. So every one can verify the NFT through qrpaper.sats