Polygon PoS

Although there is a sequencerA party responsible for ordering and executing transactions on the rollup. The sequencer verifies transactions, compresses the data into a block, and submits the data related to it to enable state reconstruction to Ethereum L1 as a single transaction. The data can be either transaction data or state diffs. set of 105 (called validatorsIn the context of L2s, a Validator is an actor that validates the correctness of state transitions. For optimistic rollups this corresponds to challengers, and for ZK rollups this corresponds to the onchain verifier), if the cap of 105 is reached, no new stakers can join. A minimum of 100,000 POL stake is required to obtain blockAn ordered list of transactions and chain-related metadata that gets bundled together and published to the L1/DA layer. Nodes execute the transactions contained within blocks to change the rollup chain’s state. Protocol rules dictate what constitutes a valid block, and invalid blocks are skipped over. production rights. There is no specific censorship resistance mechanism against selective censorship by parts of the active validator set nor a way to force transactions from Ethereum L1Layer 1 (L1) is a blockchain that is self-reliant on its validator set for its security and consensus properties. Ethereum is an example of a layer 1. Blockchains started receiving the moniker of layer 1 once layer 2 became a meaningful area of development.. The canonical bridgeA message-passing protocol between two blockchains. At its most basic, a token bridge consists of a smart contract which can escrow funds on one side of the bridge, and instruct the release or minting of corresponding assets on the other side, but bridges could also support arbitrary messages. How these instructions are validated is a critical factor in assessing the trust assumptions of a bridge. between Polygon PoS and Ethereum allows for queuing transactions from the Ethereum and Polygon PoS sides, which cannot be skipped, except for halting the queue entirely.

Currently the system permits invalid state rootsA cryptographic hash succinctly representing a state using a Merkle tree.. More details in project overview.

Data is guaranteed to be available by an external proof of stake networkA constellation of nodes (peers) that communicate via a peer-to-peer protocol, for example, in propagating transactions and blocks to other nodes. of validatorsIn the context of L2s, a Validator is an actor that validates the correctness of state transitions. For optimistic rollups this corresponds to challengers, and for ZK rollups this corresponds to the onchain verifier. On Ethereum, DA is attested via signed blockAn ordered list of transactions and chain-related metadata that gets bundled together and published to the L1/DA layer. Nodes execute the transactions contained within blocks to change the rollup chain’s state. Protocol rules dictate what constitutes a valid block, and invalid blocks are skipped over. headers.

There is no window for users to exit in case of an unwanted upgrade since contracts are instantly upgradable.

The PoS networkA constellation of nodes (peers) that communicate via a peer-to-peer protocol, for example, in propagating transactions and blocks to other nodes. is composed of 105 validatorsIn the context of L2s, a Validator is an actor that validates the correctness of state transitions. For optimistic rollups this corresponds to challengers, and for ZK rollups this corresponds to the onchain verifier. BlocksAn ordered list of transactions and chain-related metadata that gets bundled together and published to the L1/DA layer. Nodes execute the transactions contained within blocks to change the rollup chain’s state. Protocol rules dictate what constitutes a valid block, and invalid blocks are skipped over. are included in the chain only if signed by 2/3+1 of the network stake. It’s currently not possible to join the set if the validator cap is reached. The current validator cap is set to 105. In the event of a failure in reaching consensusAn agreement on the latest and correct state of a blockchain. Unlike L1 blockchains which coordinate participating nodes with consensus rules, rollups rely on L1s for reaching consensus by checking the state of the rollup smart contract deployed thereon., withdrawals are frozen.