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

# Storage Layer

**Hot & Cold Storage**

* Cold storage: Long-term archiving of historical signals, used for model training, compliance, and auditing.
* Hot storage: Low-latency access to real-time validated streams for oracle consumption.

**Distributed Storage**

* Nillion NilDB for encrypted, privacy-preserving data storage and blind computation.
* IPFS / Arweave for redundancy, immutability, and long-term persistence.\ <br>

**On-chain Indexing**

* Only metadata and CIDs are committed on-chain, reducing overhead while preserving transparency.