If NFTs are unique instances of data on a blockchain, what keeps a different chain from having the same piece of data?

I apologize, I tried to make the title as concise as I could. If a Blockchain, say the Bitcoin chain, has some NFT that exists uniquely (by definition of an NFT) on that blockchain, what prevents the same NFT from existing on a totally different blockchain, such as the Polygon Blockchain, under new ownership? InContinue reading

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