Technology
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Just because something is unique doesn’t mean it’s valuable.
Some people are just discovering this.
Try telling that to sports memorabilia collectors though.
"Look at my hockey jersey!" "Yeah, so? I have the same one." "Yeah but you're wasn't signed by Wayne Gretsky."
Or even trading cards, or comics. Or hell, even plain w-shirts with a brand logo on it for $250. People assign arbitrary values to stuff all the time. I don't understand it at all, but there's a whole ton of people that just eat that shit up like it's candy.
However NFTs were trying to assign value to the receipt for the Gretzky shirt.
Well no, in my example the shirt is the image and the signature on it is the NFT bit. Physically, it's just a bit of ink, but the shirt itself is no different than one you can go pickup at the store.
In your example what happens if the shirt is sold to someone else? In the NFT case the signature changes.
The shirt analogy doesn't work well, but NFTs are great for transferable tickets.