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Publicly visible data attached to a transaction and stored on the blockchain. This can be anything from a simple message to complex JSON objects.

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If metadata can be changed, how can the uniqueness of an NFT can be guaranteed?

He embeds unique serial number of a watch into metadata of NFT. One watch - one NFT, that is. … number and photo of a watch, such that metadata would describe a replica sell the replica along with the updated NFT which now embeds metadata which describes the expensive replica What prevents this …
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