> For the complete documentation index, see [llms.txt](https://docs.roguechain.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.roguechain.io/rogue-protocol/rogue-chain/anytrust-revolutionizing-blockchain-infrastructure/data-availability-servers.md).

# Data Availability Servers

Committee members manage Data Availability Servers (DAS), which provide access to two crucial APIs:

1. Sequencer API: Reserved solely for use by the Arbitrum chain's Sequencer, this JSON-RPC interface allows the Sequencer to submit data blocks to the DAS for storage.
2. REST API: Tailored for wider access, this RESTful HTTP(S)-based protocol permits retrieval of data blocks by hash. It supports full caching, and deployments can integrate caching proxies or CDNs to improve scalability and mitigate potential DoS attacks.