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Linus Akesson (big in the C64 demoscene) created the only good example of an NFT I've come across [1]. In the token he puts the source code to his "A Mind Is Born Demo" which compiles to the very demo you watch when you view the token [2].

[1] http://www.linusakesson.net/scene/a-mind-is-born/nft.php [2] https://opensea.io/assets/0xa7702e0769c5d408ebf2b056d7c3cc0a...

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What prevents the author from selling another token with the same content? How is the content unique to the buyer?

Nothing really. He addresses this in his post. But also the purpose isn't to sell the song (it's already creative commons). Purely just a commemorative token (and the only one he plans to make. It's not about ownership of the song though.

But the reason why this is such a great example for me is because the token actually contains something substantial. This song is now permanently a part of the blockchain, as opposed to just some link to an image host that might not exist in a decade.

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