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If erc721 tokens store the metadata off chain, how is that information secured? If I mint a jpeg as an NFT, using erc721, and the uri just points Tia file, how is that file secured? What prevents someone from changing that file?

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Use IPFS to store files. It is the best NFT metadata storage solution

If metadata is stored on a center server, it will be impossible to avoid modification and will not have any credibility.

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