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In theory, the ERC1155 can fulfill everything the ERC721 can, and more gas-efficient. So Why do people like use erc721 to public NFT instead of erc1155?

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There is one main thing that ERC-721 does that ERC-1155 doesn’t — you can ask a ERC-721 contract who the ownerOf(itemId) is, whereas on an ERC-1155 contract you can only check whether a specific account is the owner (by checking balanceOf(account, itemId)).

Having said that, most of the time the decision to use ERC-721 over ERC-1155 is because of ERC-721 enjoying (until now) better support across explorers, wallets, marketplaces, etc.

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    Very enlightening answer!
    – JESSE Bin
    Commented May 29, 2022 at 1:11

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