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

# Bringing Data To Blockchain

### How FLUXNET Brings Data to the Blockchain

#### Pull-Based Oracle Mechanism

FLUXNET employs a **pull-based oracle** model, where the data is fetched only when requested by the consumer contract. This approach contrasts with traditional push-based oracles that continuously send data to the blockchain, often leading to inefficiencies and higher costs.

**Benefits of Pull-Based Oracles:**

* **Efficiency:** Reduces unnecessary data updates, saving on gas fees.
* **Timeliness:** Ensures the most recent data is used at the time of request.
* **Customization:** Allows for specific data requests tailored to the application's needs.

#### FLUXNET Nodes and Off-Chain Data Aggregation

The FLUXNET network consists of decentralized nodes that are responsible for:

* **Listening for Data Requests:** Nodes monitor the blockchain for data request events emitted by consumer contracts.
* **Fetching Data from External Sources:** Upon detecting a request, nodes retrieve the required data from verified external APIs or data providers.
* **Data Aggregation and Verification:** Nodes may aggregate data from multiple sources to enhance reliability and perform cryptographic verification to ensure data integrity.
* **Returning Data to the Blockchain:** Nodes send the fetched data back to the oracle contract on the blockchain, which then makes it available to the consumer contract.


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