> For the complete documentation index, see [llms.txt](https://docs.fxhash.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fxhash.xyz/onchfs/cross-chain-referencing.md). # Cross-chain Referencing Onchfs provides a specification for turning directories and files into inscriptions, following a process suited for any blockchain, as the file abstraction layer is high enough so that blockchain-implementation specifics can't intefere with it. Due to files & directories being fully content-addressed, a same set of files/directories will end up having a same set of pointers regardless of the blockchain on which they're stored. This is particularly usefull when looking at cross-chain compatibility of the protocol, because it means that one asset may reference a resource on another blockchain, even though such resource may not currently exist on the former blockchain. Onchfs proxies will be responsible for handling requests to fetch corresponding files if needed, but eventually such files can be moved to the blockchain on which the original asset exist for ensuring it will be stored in perpetuity. This can become useful if there is a need to use a cheaper blockchain for storing bigger chunks of data to be accessed more expensive blockchain. While not a typical scenario, it's worth noting the built-in onchfs support for such cases. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://docs.fxhash.xyz/onchfs/cross-chain-referencing.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.