How Do Sidechains Differ from Layer 2 Rollups in Their Security Model?

Sidechains are independent blockchains with their own consensus mechanisms, running parallel to the main chain. Their security is derived from their own set of validators or miners.

Layer 2 Rollups, however, inherit their security directly from the Layer 1 main chain. If the L1 is secure, the L2 is secure.

A sidechain's security is generally weaker than the L1 and is not directly tied to the L1's economic security.

How Do Layer 2 Scaling Solutions (E.g. Rollups) Change the Block time/MEV Dynamic?
Can State Channels or Sidechains Effectively Manage the Real-Time Data Feeds Required for Exotic Derivatives?
What Is the Primary Difference between Optimistic Rollups and ZK-Rollups?
What Is the Difference between a Rollup and a Sidechain?
How Do Sidechains Differ from Layer-2 Solutions like Lightning Network?
What Is the Trade-off in Computational Complexity between the Two Rollup Types?
What Are the Security Trade-Offs between Optimistic Rollups and ZK-Rollups for Financial Applications?
What Are ‘Rollups’ (Optimistic and ZK) and How Do They Use Batching?

Glossar