Definition ∞ Consensus security refers to the robustness and reliability of the mechanisms by which a distributed ledger system achieves agreement among its participants. It is the assurance that the network’s state is accurately and consistently maintained, even in the presence of faulty or malicious actors attempting to disrupt the process. This security underpins the trustworthiness of the blockchain’s transaction history.
Context ∞ The focus on consensus security often intensifies during periods of network stress, when novel attack vectors are proposed, or when protocol upgrades aim to enhance decentralization or Sybil resistance. Analyzing consensus security is vital for evaluating the long-term viability and integrity of any given blockchain.
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