# What is Data Availability ?

**Data Availability (DA)** ensures all network data is accessible to every node, enabling decentralized consensus and secure, transparent operations. It guarantees that once data is recorded, it remains immutable—vital for verifying transactions and smart contracts across decentralized systems.

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#### Why Avail?

Neova integrates Avail's DA layer to ensure a scalable, decentralized, and cost-efficient infrastructure:

* **Massive Decentralization:** Built on Polkadot’s Nominated Proof of Stake (NPoS) with up to 1,000 validators and fair reward distribution via the Phragmén method.
* **Scalability by Design:** Supports large block sizes with Data Availability Sampling (DAS) for high throughput.
* **Cost-Efficient:** No execution layer = lower operating costs for data availability.<br>

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#### Why Nubit?

**Nubit**, a Bitcoin-based DA layer, adds optionality and security to the Neova ecosystem:

* **Bitcoin-Grade Security:** Ideal for users who prioritize Bitcoin’s decentralization and trustless environment.
* **Flexible Interoperability:** Users can choose their preferred DA layer based on cost, security, or scalability—expanding use cases across the network.


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