A decentralized sequencer orders transactions in a distributed ledger without relying on a single trusted authority. Instead of one central server deciding the sequence, a group of independent nodes collaborate to agree on ordering. This concept is critical in layer-2 scaling solutions for blockchains. Most current rollups (Arbitrum, Optimism, Base) use centralized sequencers controlled by a single entity, which creates a single point of failure and censorship risk. If the sequencer goes down, the network stalls. If it is compromised, transactions can be reordered for profit. Decentralizing the sequencer distributes this power across many nodes, improving uptime and censorship resistance. No single entity can block or reorder transactions at will. The tradeoff is added complexity and potential latency. Several projects are actively working on decentralized sequencer designs.
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