Clear DefinitionsComposable Rollups
1 min read
Pronunciation
[kuh-moh-zuh-buhl roh-lups]
Analogy
Like building custom sandwiches from separate bread, fillings, and sauces rather than buying fixed menu items.
Definition
Layer‑2 rollup architectures designed with modular, reusable components—such as sequencing, execution, and data availability layers—that can be independently upgraded and composed.
Key Points Intro
Composable rollups decouple functions to allow interchangeable scaling solutions.
Key Points
Modular DA: Separate data availability through Celestia or EigenDA.
Execution engine: Pluggable EVM, WASM, or custom VMs.
Sequencer: Independent ordering service with provable fairness.
Cross‑rollup calls: Standard interfaces for inter‑rollup messaging.
Example
An L2 project uses EigenLayer for data availability, a custom zkEVM execution engine, and a decentralized sequencer network to form a composable rollup.
Technical Deep Dive
Rollup spec splits into distinct smart contracts: `SequencerInbox`, `StateCommitmentChain`, and DA contracts. Developers choose DA provider via interface hooks, swap execution VM by linking different precompile sets, and enable cross‑rollup proofs through standardized merkle proof formats.
Security Warning
Modularity increases attack surface; each component’s security must be independently audited.
Caveat
Component upgrades require coordination across multiple governance processes.
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