Ethereum loves rollups. As of late, “based” rollups are in vogue.

What makes based rollups special? Its sequencer.

Layer-2s today use a trusted centralized sequencer to order users’ transactions before they are posted down to the layer-1 for settlement, but based rollups defer those execution duties to Ethereum layer-1 validators. This is otherwise known as “based sequencing.”

There are two primary reasons this is preferable: censorship resistance and interoperability. 

Using the layer-1 as a sequencer ensures the same liveness guarantees as Ethereum layer-1 blocks, and avoids the major complaints of potential censorship surrounding trusted centralized… Read more on Blockworks