Polygon

Polygon PoS Architecture Explained

Updated 2025
Sidechain Technology

Plasma Framework & Sidechain Design

Polygon PoS is built on a Plasma framework that creates a sidechain running parallel to the Ethereum mainnet. This architecture allows transactions to be processed at high speed while still benefiting from Ethereum's security as the root chain. The sidechain maintains its own block producers who are selected based on their staked MATIC deposits, ensuring a deterministic and economically incentivized consensus process.

Validator Set & Consensus

Polygon PoS relies on approximately 100 validators who participate in the PoS consensus mechanism to validate and confirm transactions. Validators must stake MATIC tokens to become eligible. Block producers are selected deterministically based on the largest staked deposits, ensuring honest behavior through economic incentives. This model enables fast block times and high transaction throughput while keeping gas fees orders of magnitude lower than Ethereum L1.

Data Availability on Polygon PoS

In Polygon PoS, all transaction data is stored on the sidechain itself, maintaining a completely separate blockchain for transaction processing. Periodically, checkpoints of the sidechain state are submitted to the Ethereum mainnet as Merkle roots, anchoring the sidechain's security to Ethereum. This model maximizes throughput because it avoids posting all data to Ethereum, though it also means security is reliant on the validator set rather than Ethereum's full security directly.

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