> For the complete documentation index, see [llms.txt](https://unium.gitbook.io/unium/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://unium.gitbook.io/unium/untitled-1.md). # What’s NFT? ![](/files/U5Gv9b3NxbFHosH5sUqi) **NFT (Non-Fungible Token) is literally a ‘non-fungible token’. Cryptocurrency, like real money, can be used by anyone and can be replaced, but NFTs have non-fungible characteristics because each digital asset has a unique recognition value. Due to the nature of blockchain technology, these NFTs cannot be deleted or forged once created, and ownership and transaction history are specified, so they can be used as a kind of 'digital certificate and proof of ownership'. Digital items can be easily copied without restrictions. Therefore, until now, it was not clear which was the original and who owned it. However, when an NFT is created, authentication and proof of ownership of the digital item are performed, so it becomes a ‘digital asset’ and can be freely bought and sold between people who want to trade.** --- # 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://unium.gitbook.io/unium/untitled-1.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.