LayerZero is a full-chain interoperability protocol designed for delivering lightweight messages across chains. LayerZero provides trusted and guaranteed messaging with configurable trustworthiness. It is a "blockchain of blockchains" that allows other blockchain networks to communicate directly in a trustless manner.

The key feature of LayerZero is ultra-light nodes (uln). These smart contracts run on every blockchain and serve as endpoints for cross-chain communication. uln uses block headers and transaction proofs to verify the validity of transactions and messages from other chains, ensuring security and efficiency.

LayerZero supports any blockchain that can run smart contracts, such as Ethereum, BNB Chain, Avalanche, Polygon, Arbitrum, Optimism, Fantom and other chains. LayerZero also supports non-evm chains such as Aptos.