A tethered blockchain protocol describes a secondary blockchain that is cryptographically linked to a primary, more secure blockchain, deriving its security and finality from the main chain. This connection allows the tethered chain to process transactions more rapidly or with different functionalities while relying on the primary chain for ultimate settlement. It offers a balance between scalability and security.
Context
This architectural pattern is common in various layer-2 scaling solutions and interoperability frameworks. News frequently reports on new tethered chains being launched or upgrades to existing ones, often discussing their security assumptions and performance benefits. The relationship between the tethered chain and its parent chain is a key area of analysis for network robustness.
Aegis introduces a provably safe and live protocol for securing expansion chains with primary-chain stake, resolving security challenges posed by dynamic validator withdrawals.
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