# Old Infrastructure

Ocean Protocol is now using Ocean Nodes for all backend infrastructure. Previously we used these three components:

1. [Aquarius](/developers/old-infrastructure/aquarius.md): Aquarius is a metadata cache used to enhance search efficiency by caching on-chain data into Elasticsearch. By accelerating metadata retrieval, Aquarius enables faster and more efficient data discovery.
2. [Provider](/developers/old-infrastructure/provider.md): The Provider component was used to facilitate various operations within the ecosystem. It assists in asset downloading, handles [DDO](/developers/ddo-specification.md) (Decentralized Data Object) encryption, and establishes communication with the operator-service for Compute-to-Data jobs. This ensures secure and streamlined interactions between different participants.
3. [Subgraph](/developers/old-infrastructure/subgraph.md): The Subgraph is an off-chain service that utilizes GraphQL to offer efficient access to information related to datatokens, users, and balances. By leveraging the subgraph, data retrieval becomes faster compared to an on-chain query. This enhances the overall performance and responsiveness of applications that rely on accessing this information.


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