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Considering all NFTs are unique, are all erc 721 tokens collectibles? I'm asking this because on the Etherscan website some NFTs have the collectibles tag and some do not.
Not necessarily. ERC721 tokens can represent anything you want. It can be a collectible 'digital item', but it can also represent things like ownership of a smart contract or a specific basket of currencies (e.g. 1.34 ETH + 157 DAI)
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