> For the complete documentation index, see [llms.txt](https://docs.itheum.io/product-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.itheum.io/product-docs/pre-aithra/pre-aithra-developers/software-development-kits-sdks/data-nft-sdk/guide-4-use-the-data-nft-deputy-feature-to-delegate-access-of-your-data-nfts-to-a-smart-contract.md).

# Guide 4: Use the Data NFT "Deputy" Feature to delegate access of your Data NFTs to a Smart Contract

The system works in an "Appointer > Delegator" design. The Appointer is a smart contract that will hold Data NFTs. It exposes a public `viewDeputyAddress` method that returns an Address of an appointed "deputy" that can Open the Data NFTs the Appointer smart contract holds. Here is a basic