Definition ∞ A checkpoint mechanism establishes a verifiable state of a blockchain at a specific point in time. This process creates a fixed, immutable reference that subsequent blocks must validate against, enhancing network integrity. It serves as a security measure to prevent certain types of attacks, particularly those targeting historical chain reorganizations.
Context ∞ Checkpoint mechanisms are critical in proof-of-stake blockchains and layer-2 scaling solutions for security and finality. Discussions often center on the frequency and decentralization of these checkpoints, as they balance security with censorship resistance. News reports frequently reference these mechanisms when addressing network stability or resistance to malicious actors.
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