# 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.


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