Accountability, the ability to provably identify protocol violators, gained prominence as the main economic argument for the security of proof-of-stake (PoS) protocols. Rollups, the most popular scaling solution for blockchains, typically use PoS protocols as their parent chain. We define accountability for rollups, and present an attack that shows the absence of accountability on existing designs. We provide an accountable rollup design and prove its security, both for the traditional `enshrined' rollups and for sovereign rollups, an emergent alternative built on lazy blockchains, tasked only with ordering and availability of the rollup data.

翻译：问责,即能够可靠地识别违反协议者的能力,作为保证取证协议安全的主要经济理由,越来越受到重视。 卷号,即最流行的块链缩放解决方案,通常使用POS协议作为其母链。 我们定义了卷号问责,并提出了对现有设计缺乏问责的进攻。 我们提供了一个负责的卷号设计,并证明了其安全性,既包括传统的“密封”卷号,也包括主权卷号,后者是建立在懒惰的块链上的新兴替代方案,仅负责订定和提供卷号数据。