> For the complete documentation index, see [llms.txt](https://docs.x.ar/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.x.ar/a-new-tech-era/web3-structures.md).

# Web3 Structures

<figure><img src="/files/flSlI7Xum0dcct1C6e2W" alt=""><figcaption></figcaption></figure>

* zKey(zkLogin on Starknet): Allows players to use Web2 credentials(Apple/Google/etc) to log in to Web3 wallets, verifying credentials using zero-knowledge proofs to protect privacy. Developed by XAR team.
* Instance-based Server: 60 fps frame synchronization and proof roll-up, ensuring consistent gameplay and accurate recording of game data.
* Checks Protocol: Transmits off-chain data to blockchains.
* Indexer: Transmits on-chain data to servers.
* Starknet: Serves as the settlement layer, handling transaction related data. Starknet features low gas fees and significant potential for future performance improvements, and it natively supports AA wallets, making it the ideal blockchain for social applications.