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Interoperable Rollups

1 min read
Pronunciation
[in-ter-op-er-uh-buhl roh-lups]
Analogy
Like multiple suburban rail lines built to the same track gauge and signaling system, allowing trains to run seamlessly from one line onto another.
Definition
Layer‑2 rollup solutions architected with common messaging and state‐sharing protocols so that different rollup chains can directly interact—calling each other’s contracts and sharing liquidity—without routing through Layer‑1.
Key Points Intro
Interoperable rollups enable direct cross-rollup composability and liquidity sharing.
Key Points

Standard bridge contracts: Uniform interfaces for cross-rollup calls.

Cross-rollup messages: Atomic message passing protocols.

Shared state roots: Commitments accessible by peer rollups.

Economic linking: Liquidity pools spanning rollup networks.

Example
Two zk‑EVM rollups implement a shared mailbox contract standard, enabling a token deposit on Rollup A to be instantly recognized and used on Rollup B.
Technical Deep Dive
Rollup contracts expose `sendMessage(destRollup, payload)` and `receiveMessage(srcRollup, payload, proof)` functions. Sequencers emit Merkle roots of L2 state; other rollups verify via fraud or validity proofs. An inter-rollup router batches cross-rollup calls to reduce gas.
Security Warning
Faulty message proofs can lead to inconsistent state; audit cross-rollup verification logic.
Caveat
Requires synchronized upgrade schedules and shared standards governance.
Related Terms
Cross-Domain Messaging

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