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

# Architecture

The architecture of the PoB ecosystem has 4 layers (from top to bottom):

* Application layer
* Physical Infrastructure Integration Layer
* Infrastructure, Security & Web3 layer
* Specification and Community layer (ecosystem)

<figure><img src="/files/dPXr2tQiUzrIkaEscr7a" alt=""><figcaption><p>PoB Ecosystem </p></figcaption></figure>

## Entities of PoB

<figure><img src="/files/WuIrYXrlQGnwk93R1Wfn" alt=""><figcaption><p>PoB Architecture</p></figcaption></figure>