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Avail is a specialized Web3 infrastructure layer designed to provide scalable and trust-minimized data availability for modular execution layers such as rollups and sovereign chains. It addresses the critical challenge of ensuring that data required for blockchain state validation is reliably available without relying on a single monolithic chain. Avail achieves this by separating data availability from execution, enabling execution layers to scale independently while maintaining security guarantees.

The core of Avail consists of two main components: the Avail Node, a Substrate-based blockchain optimized for data availability, and the Avail Light Client, which performs data availability sampling and hosts data in a peer-to-peer overlay network. The node uses the GRANDPA+BABE consensus mechanism, assuming at least two-thirds honest validators, to secure the network. Light clients subscribe to finalized headers and sample data to verify availability, distributing data across a P2P network to ensure high availability.

Avail also supports interoperability through a trust-minimized bridge called VectorX, developed in partnership with Succinct Labs. This bridge enables efficient message and token transfers between Avail and Ethereum, facilitating cross-chain use cases. Developers can interact with Avail via comprehensive APIs and SDKs, including the Nexus SDK, which abstracts chain interactions and supports unified balances, transfers, and bridging. The platform supports deploying rollups, querying balances, submitting data blobs, and running validators or light clients.

To get started, developers can access detailed documentation, run nodes or light clients, use the Nexus SDK for integration, and leverage the official bridge UI for cross-chain operations. Avail’s modular architecture and focus on data availability make it suitable for projects seeking scalable, secure, and interoperable blockchain infrastructure.