Definition ∞ A Shared Security Zone is an architectural concept where multiple independent blockchain networks or layers derive their security guarantees from a common, underlying base layer. This design allows newer or smaller chains to benefit from the established robustness of a larger, more secure network. It reduces the individual security overhead for each participating chain. This fosters efficiency and safety.
Context ∞ This approach is increasingly prevalent in modular blockchain designs, such as those employing rollups or sidechains that settle on a mainnet. A shared security zone enhances the collective resilience of the ecosystem by centralizing the cost of security provision. This model helps new protocols achieve robust security without needing to bootstrap their own extensive validator sets.
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