BlockchainAdvanced#L2#Tech
Sequencer
S
Definition
A node in a Rollup (L2) responsible for ordering transactions before they are batched and sent to the L1 (Ethereum).
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Concept Diagram
Key Takeaways
1
Sequencers order transactions on L2 rollups before they are batched and submitted to L1
2
They determine the execution order which affects MEV extraction and transaction finality
3
Currently most rollups use centralized sequencers creating a single point of failure
4
Decentralized sequencers aim to distribute this critical role across multiple operators
Practical Example
Arbitrum's sequencer processes 10,000 transactions per second, orders them, and submits a compressed batch to Ethereum every 10 minutes. If the sequencer goes down, no new transactions are processed until it recovers.
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Related Terms
Blockchain
Data Availability (DA)The guarantee that the data required to verify a block is available to all network participants, critical for Rollup security.
Blockchain
Proposer-Builder Separation (PBS)A design where the task of proposing a block is separated from the task of building it, aimed at mitigating MEV centralization.
Blockchain
FinalityThe moment at which it becomes impossible to change or revert a transaction once it has been added to the blockchain.
Blockchain
Layer 2 (L2)A secondary framework or protocol built on top of an existing blockchain (L1) to improve scalability and transaction speed.
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