BlockBeats 消息，5 月 6 日，以太坊开发者 @nero_eth 发文探讨“延迟执行与免费 DA 问题”。延迟执行（EIP-7886）改变验证流程：验证者在交易完全执行前通过预检查（如 nonce、余额）认证区块有效性。若交易在执行时因余额不足失效（例如，交易 A 耗尽账户 B 余额，导致 B 的交易 B 无法支付 Gas），其数据已写入区块并由验证者处理，但未支付费用。这导致 Free DA 问题：无效交易占用链上数据可用性资源，验证者未获补偿。
文章提出乐观认证、预验证与预收费、预收费实体及执行层无操作四种方案，通过预扣费用、区块重组或状态回滚确保数据写入有成本，防止 Free DA 导致的网络拥堵和经济不公。
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