data availability

Without data availability, users cannot reconstruct L2 state or exit funds independently.如果没有数据可用性，用户将无法重构 L2 状态或独立提取资金。

Data availability is a fundamental requirement for rollup security—if data is withheld, withdrawals can be blocked entirely.数据可用性是 Rollup 安全性的基础要求——如果数据被扣留，提款可能会被完全阻止。