> For the complete documentation index, see [llms.txt](https://docs.the4thpillar.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.the4thpillar.io/developers/architecture-by-layers.md).

# Architecture by Layers

Zooming out, the architecture is quite straightforward. The 4P App client sits on the top, powered by the [OCC SDK](https://wiki.4thtech.io/docs/integration/sdk), [OCC Protocol v.1](https://wiki.4thtech.io/docs/architecture/protocol), [encryption,](https://docs.the4thpillar.io/developers/architecture-by-layers/encryption) [PollinationX ](https://wiki.pollinationx.io/overview/px-storage-nft)decentralized storage service, and [blockchain networks](/dapps-and-clients/multi-chain-deployment.md). 4P smart contracts enable Four Token RTA (i.e. right-to-access) models within the system, enabling users to access the 4P Super App Pro features.

<figure><img src="/files/DvS63rGZ3biMNmPgVsv9" alt=""><figcaption></figcaption></figure>