Historical retrospective · Layer 2
Data availability became a key criterion for rollup safety
A rollup must make enough transaction data available for users or independent parties to reconstruct state and challenge invalid behavior.
Without accessible data, a valid proof or dispute mechanism may not provide the expected user exit guarantees.
Data availability became a distinct research and product layer in scaling architectures.
When comparing networks, examine who publishes data, how long it remains accessible and what users can do during an outage.
Primary source
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