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the example at https://github.com/clarity-lang/book/blob/main/projects/sip009-nft/contracts/marvin-token.clar for instance
(define-read-only (get-token-uri (token-id uint))
(ok none)
)
This will essentially show no image, so by definition is not a valid NTF. I assume that this should be changed to something like
(define-read-only (get-token-uri (token-id uint))
(ok (some "https://....../{id}.json"))
)
or something similar with an IPFS address if one prefers to use that.
I think that Stacks looks very interesting and has a lot of potential but the only two tutorials available online are the one of this book and the one from hiro.so that is also wrong (doesn't provide with a viable example of a token to be minted only by the owner).
I really think that having a clear and updated NFT contract tutorial is absolutely crucial.
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