Ordering Linearizability is a strong consistency guarantee ensuring that all operations appear to have occurred instantaneously at some point between their invocation and response. In distributed systems like blockchains, this property means that transactions are processed and recorded in a global, sequential order that reflects their real-time execution, as if there were a single, centralized processor. It eliminates ambiguities regarding the sequence of events across different nodes, which is crucial for maintaining data integrity and preventing race conditions in decentralized applications. Achieving true linearizability in a distributed ledger is a significant technical challenge.
Context
The discussion surrounding Ordering Linearizability in blockchain protocols is central to ensuring fairness and predictability in transaction processing, especially for decentralized finance. A key debate involves the trade-offs between achieving this strong consistency model and maintaining high transaction throughput and network scalability. Future developments include research into consensus mechanisms and transaction sequencing protocols that can approach linearizability without sacrificing performance, aiming to provide users with a more reliable and consistent view of the global transaction ledger.
FairDAG introduces a two-layer DAG-based consensus to decouple block proposal from final ordering, fundamentally constraining adversarial MEV manipulation while boosting throughput.
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