The engineering teams at Polygon Labs have unveiled a proposed architecture for Polygon 2.0, a groundbreaking design aimed at delivering unlimited scalability and unified liquidity. This initiative seeks to realize the vision of Polygon as the Value Layer of the Internet, addressing long-standing challenges in the Web3 ecosystem.
For years, Web3 has struggled with scalability issues. While new blockchains can be added to meet growing demand for blockspace, this often results in fragmented liquidity and a suboptimal user experience. Polygon 2.0 emerges as the solution, offering an elastically scalable, unified environment for accessing value—much like the Internet serves as a unified platform for information.
This proposal is intended to guide all future Polygon protocol development, serving as both a conceptual North Star and a formal framework for innovation.
Background: From Divergence to Convergence
Polygon has always embraced a culture of experimentation. Instead of betting on a single approach, the community and developers explored multiple paths to build next-generation blockchain infrastructure. This process mirrors creative problem-solving: a divergence phase of exploring diverse ideas followed by a convergence phase where these ideas consolidate into a cohesive solution.
During the divergence phase, Polygon teams experimented across the entire tech stack, including:
- Various blockchain architectures like sidechains, rollups, and validiums.
- Multiple approaches to zero-knowledge (ZK) execution environments, such as zkEVM types 1-3 and Polygon Miden.
- Diverse blockchain clients, including Polygon Edge, Ethereum clients, and custom-built solutions.
- Innovations in cross-chain messaging, staking, and other critical components.
This phase yielded valuable insights and lessons, paving the way for consolidation. The convergence phase involved aligning on a specific protocol architecture—now presented as the optimal foundation for the Value Layer of the Internet.
The Four Layers of Polygon 2.0 Architecture
Polygon 2.0 is structured as a collection of four protocol layers, each enabling a critical process within the network. This layered design, inspired by the Internet protocol suite, simplifies reasoning, implementation, and upgrades. The layers are:
- Staking Layer
- Aggregation Layer (AggLayer)
- Execution Layer
- Proving Layer
Staking Layer: Decentralization Made Easy
The Staking Layer is a Proof-of-Stake (PoS) protocol that uses Polygon's native token to decentralize participating chains. It leverages a common, highly decentralized validator pool and an innovative restaking model.
Implemented on Ethereum via smart contracts, this layer includes:
Validator Manager: A contract that maintains the validator registry, processes staking/unstaking requests, enables validators to restake across multiple Polygon chains, and handles slashing events.
Chain Manager: Each Polygon chain has its own Chain Manager contract, which defines validator set requirements, optional criteria (e.g., compliance or additional staking), and slashing conditions.
This layer allows chains to achieve decentralization "out of the box," freeing teams to focus on use cases and community building. Validators earn rewards in Polygon tokens and additional revenue from transaction fees and chain-specific incentives.
Aggregation Layer: Unified Cross-Chain Communication
The AggLayer facilitates secure, seamless cross-chain messaging within the Polygon ecosystem. It abstracts the complexity of cross-chain interactions, making the entire network feel like a single chain to users. Key features include:
- Shared Access to Native Ethereum Assets: Eliminates the need for synthetic tokens by providing a shared bridge for native asset transfers.
- Seamless Composability: Supports near-instant, atomic cross-chain transactions, enabling unified liquidity.
Built on the LxLy protocol's Message Queues concept, the AggLayer introduces an Aggregator component that accepts ZK proofs and message queues, aggregates proofs into a single proof, and submits it to Ethereum for verification. This reduces gas costs and enables optimistic message acceptance for instant cross-chain interactions.
The Aggregator operates in a decentralized manner, managed by validators from the common pool to ensure liveness and censorship resistance.
Execution Layer: Transaction Sequencing and Block Production
The Execution Layer enables Polygon chains to produce sequenced batches of transactions (blocks). This layer is commoditized and similar to those in networks like Ethereum or Bitcoin. Components include:
- P2P: For node discovery and message exchange.
- Consensus: For validator agreement on blockchains.
- Mempool: Collects and syncs user transactions.
- Database: Stores transaction history.
- Witness Generator: Produces data required for ZK proofs.
Given its complexity, existing performant implementations (e.g., Erigon) should be reused where possible.
Proving Layer: High-Performance Zero-Knowledge Proofs
The Proving Layer is a flexible, high-performance ZK proving protocol that generates proofs for all transactions—internal and cross-chain. Its components are:
- Common Prover: A highly efficient ZK prover, developed as the successor to Plonky2, supporting arbitrary transaction types and simplifying proof aggregation and verification.
- State Machine Constructor (Optional): A framework for defining state machines, abstracting proving complexity, and enabling modular, parameterizable designs.
- State Machine: Simulates execution environments proven by the prover. Examples include zkEVM and MidenVM, with community-built options like zkWASM possible.
Benefits include efficient proof generation/verification, straightforward aggregation, and safe cross-chain communication between state machines.
Frequently Asked Questions
What is Polygon 2.0?
Polygon 2.0 is a proposed architecture designed to provide unlimited scalability and unified liquidity for the Polygon ecosystem. It aims to create a seamless value layer for the Internet, similar to how the Internet functions for information.
How does the AggLayer improve user experience?
The AggLayer enables near-instant, atomic cross-chain transactions and allows native Ethereum assets to move seamlessly across chains. This eliminates the need for synthetic tokens and simplifies interactions, making the entire network feel like a single chain.
What role do validators play in Polygon 2.0?
Validators secure the network through the Staking Layer, participating in a common pool that supports multiple chains. They earn rewards in Polygon tokens and additional fees, while ensuring decentralization and censorship resistance.
Can developers build custom state machines?
Yes, the Proving Layer supports custom state machines built using the state machine constructor or languages like Rust. This flexibility allows for innovations like zkEVM, MidenVM, or community-developed options.
How does proof aggregation reduce costs?
By aggregating multiple ZK proofs into a single proof, the AggLayer minimizes the gas required for Ethereum verification, lowering transaction costs and improving efficiency.
Is Polygon 2.0 compatible with existing Ethereum tools?
Yes, the architecture maintains compatibility with Ethereum assets and tools, ensuring a smooth transition for developers and users. 👉 Explore advanced scaling strategies
Looking Ahead
Polygon Labs will release detailed deep dives into each protocol layer in the coming weeks, exploring low-level mechanics and how they integrate into a cohesive architecture. The community is encouraged to review these proposals and provide feedback, helping to shape the future of Polygon 2.0.
This architecture represents a significant leap toward a scalable, unified value layer for the Internet, leveraging cutting-edge zero-knowledge technology and decentralized governance. 👉 Learn more about unified liquidity solutions