# Rollup Data Availability ⎊ Area ⎊ Resource 2

---

## What is the Availability of Rollup Data Availability?

Rollup data availability refers to the guarantee that all transaction data processed by a Layer 2 rollup is published and accessible to the public. This ensures that users can independently verify the integrity of the rollup's state transitions. The data must be available on the Layer 1 chain or through a separate data availability layer to allow for fraud proofs or state reconstruction.

## What is the Security of Rollup Data Availability?

Data availability is a fundamental security requirement for optimistic rollups, enabling users to challenge invalid state transitions through fraud proofs. Without data availability, a malicious sequencer could publish an incorrect state root without providing the necessary data for verification. This mechanism protects users from censorship and asset theft.

## What is the Scalability of Rollup Data Availability?

The design of rollup data availability directly impacts the scalability of the Layer 2 solution. By posting compressed transaction data rather than full execution traces, rollups significantly reduce the data footprint on the Layer 1 chain. This optimization allows for higher transaction throughput while maintaining the security guarantees of the underlying blockchain.


---

## [Optimistic Rollup Fraud Proofs](https://term.greeks.live/term/optimistic-rollup-fraud-proofs/)

## [ZK Rollup Validity Proofs](https://term.greeks.live/term/zk-rollup-validity-proofs/)

## [Rollup State Verification](https://term.greeks.live/term/rollup-state-verification/)

## [Layer 2 Settlement Costs](https://term.greeks.live/term/layer-2-settlement-costs/)

## [ZK-Rollup Verification Cost](https://term.greeks.live/term/zk-rollup-verification-cost/)

## [Rollup Data Availability Cost](https://term.greeks.live/term/rollup-data-availability-cost/)

---

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---

**Original URL:** https://term.greeks.live/area/rollup-data-availability/resource/2/