Avail is a blockchain that records blockchain transactions and proves that the data is available. It is laser-focused on data availability and ordering and is an important component of Polygon's modular chain design vision. Proposing a new architecture with a base consensus layer that only creates agreement on transaction data's order and what it is, Avail completely decouples it from the issue of validity. This ensures lightning-fast, scalable, and flexible transactions to support any chain.