# ERC2477 Token Metadata Integrity ## Intro Interface ERC Defines mechanism by which clients (dapps) may verify that the token metadata has been delivered without unexpected manipulation. Has two functions: * tokenURIIntegrity * tokenURISchemaIntegrity Which defines how to add tokenURIIntegrity to metadata which is then added to Schema ### Solving problem URLs (Uniform Resource Locators) provides no guarantees of storing metadata. This standard is providing access to assets on-chain. ### Standards that allows attaching metadata to specific tokens using URI: * ERC721 metadata extension (`ERC721Metadata`) * ERC1155 metadata extension (`ERC1155Metadata_URI`) * EIP1046 Metadata extension (DRAFT) ERC-20 Metadata Extension ## Further reading * Full implementation: * Discussion: --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://nft-standards.gitbook.io/nft-standards-wiki/standards/erc2477-token-metadata-integrity.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.