“NFT token ERC” is a search shorthand for Ethereum token standards related to non-fungible tokens—not the name of one specification. The key distinction is that ERC-721 defines an individually identifiable token model, while ERC-1155 can support multiple token types, including non-fungible ones, within one contract.

What “NFT token ERC” refers to

ERC is used in the names of Ethereum standards that describe interfaces and expected behavior for contracts. The phrase “NFT token ERC” combines a token category with that standards label. It does not identify a unique standard or guarantee that a token follows a particular specification.

An NFT, or non-fungible token, is a token intended to be distinguishable from other tokens. On Ethereum, an ERC-721 token is uniquely identified within its contract by the combination of the contract address and its token ID. That is why a token name or symbol alone is not enough to identify a particular ERC-721 token. source

The token is the contract-based record; the ERC specification describes how applications and contracts can interact with it. Those are related, but not identical, concepts: a token may be described as an NFT, while a standard provides a defined interface for representing and handling token records.

How ERC-721 and ERC-1155 relate to NFTs

ERC-721 is designed for distinct token IDs. Each token ID is unique within the contract, making this standard a direct fit for a contract that represents separately identifiable tokens. Its metadata extension can expose a token URI referring to information associated with a specific token ID. The standard itself does not guarantee that the referenced metadata or media will remain available, accurate, or unchanged. source source

ERC-1155 takes a multi-token approach: one contract can manage multiple token types, including fungible, non-fungible, and semi-fungible configurations, and can support single and batch transfers. A token ID can have a quantity greater than one. Therefore, an ERC-1155 token ID is not automatically non-fungible simply because it has an identifier; its implementation and supply matter. source

These standards describe different token models rather than interchangeable labels. ERC-721 focuses on distinct tokens identified by contract and token ID. ERC-1155 allows one contract to handle multiple token types, with the behavior of each type depending on its configuration and quantity. Neither description means every NFT must use one of these standards.

What an NFT standard specifies—and what it does not

A token standard provides technical expectations for contract interfaces and behavior. It can help applications recognize and interact with tokens in a consistent way, but it does not establish every fact a user might care about.

For example, ERC-721’s optional metadata interface can provide a URI for token-specific metadata. The URI may point to onchain data, content-addressed data, or mutable offchain hosting. The standard does not by itself guarantee that the destination is permanent, available, accurate, or properly licensed. source

Standards also do not necessarily make every associated feature automatic. ERC-2981, for example, standardizes retrieval of royalty recipient and amount information for a stated sale price. Payment remains voluntary and depends on marketplace or participant implementation. This illustrates the difference between a standardized signal and an action that a separate application or participant must carry out. source

Likewise, an interface specification is not a blanket assurance that a particular contract is correctly implemented or secure. A contract’s actual behavior must be evaluated against its code and the relevant specification. The standard describes a target interface; it does not certify every contract that claims to use it.

How to identify the standard used by an NFT

For a specific NFT, begin with the contract address and the token ID rather than relying only on a collection name or symbol. For an ERC-721 token, that pair identifies the token within the Ethereum chain. source

Next, inspect the contract’s documentation and declared interfaces, then compare the implementation with the relevant standard. If the contract uses ERC-721, check whether its behavior matches the ERC-721 specification. If it uses ERC-1155, account for the fact that the standard can represent token IDs with quantities greater than one, as well as non-fungible configurations. A label or interface declaration alone does not establish that all implementation details conform.

Finally, keep the verification question narrow. Confirming a token standard concerns technical interface behavior; it does not by itself verify metadata permanence, rights associated with referenced content, or the security of a particular contract. Those require separate, implementation-specific checks. In short, “NFT token ERC” points to NFT-related Ethereum standards, while ERC-721 and ERC-1155 specify distinct ways contracts can represent and handle token types.

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