Aggregated blockchain design borrows the best of the monolothic and modular approaches to scale. In its endstate, the Aggregation Layer will provide a common language for secure, atomic, interoperability among heterogeneous chains.
The Aggregation Layer is a decentralized protocol with two components: a common bridge + the ZK-powered proof validation and aggregation mechanism for seamless, cross-chain transactions. With ZK proofs providing securing chains connected to the Aggregation Layer can remain sovereign and module while preserving the seamless UX of monolithic chains.
The Unified LxLy Bridge is the backbone of the Aggregation Layer. It is designed to act as a common way for connected EVM chains to exchange messages and assets safely. Implementations of this bridge for non-evm chains are in progress and will be linked and included when teams have made them available.
AggLayer v0.1.x is a simple system which allows blockchains which are connected to the Unified LxLy bridge to transmit proofs to Ethereum safely. This system is designed primarily to serve CDK chains utilizing full validity proofs with which it acts as security layer, checking proof validity before settling directly to Ethereum. In this version only chains producing full execution proofs via the Polygon CDK prover can participate in the AggLayer.
Latest Release: v0.1.6
The in-development version of the AggLayer-node which supports chains which use the Pessimistic Proof vs requiring a full ZK-Rollup.
The Pessimistic Proof is a proof of proper token accounting for the bridge of a specific chain. This allows attached chains and rollups to prove to the agglayer they are withdrawing tokens up to the amount the chain owns. The pessimistic proof is currently written as a rust program which verifies the validity of a chain's bridge state and designed to be used within SP1 to create a Plonky3-based STARK.
Proof Source Code SP1 Program Source Code
Bridge and Call is a smart contract framework which allows applications to take advantage of the Unified LxLy Bridge and the Aggregation Layer to unlock cross-chain interactions for their application. Using Bridge and Call a user can use funds on a source chain to directly interact with an application running on a destination chain
A draft specification describing the decentralized vision of the AggLayer is coming soon. This will be aimed primarily at blockchain developers and integrators looking to understand the principals at work, and will be open for feedback and contribution to the broad community.
