> For the complete documentation index, see [llms.txt](https://docs.artinals.com/artinals-protocol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.artinals.com/artinals-protocol/art20/markdown.md).

# Data Structures

- [NFT](https://docs.artinals.com/artinals-protocol/art20/markdown/nft.md)
- [CollectionCap](https://docs.artinals.com/artinals-protocol/art20/markdown/collectioncap.md)
- [UserBalance](https://docs.artinals.com/artinals-protocol/art20/markdown/userbalance.md)
- [TokenIdCounter](https://docs.artinals.com/artinals-protocol/art20/markdown/tokenidcounter.md)
- [Dual IDs](https://docs.artinals.com/artinals-protocol/art20/markdown/dual-ids.md)