Traditional shared sequencing

We recognize that significant effort has been made on traditional shared sequencers (shared sequencers that are not “based”). One valuable feature of the Based Stack is that appchains can still reap the benefits of shared sequencing with other L2s. As mentioned above, we implement a design called Forward Based Sequencing, which gives shared sequencers (acting as forward sequencers) the ability to influence block production without a distinct monopoly. This enables shared sequencers to provide composability between Spire based appchains and other non-based rollups, especially when paired with execution preconfirmations. Execution preconfirmations allow forward sequencers to get (collateral-backed) execution guarantees that can be used to approximate atomic execution. We call this “optimistic atomic execution.”

One important thing to note is that this design could theoretically be used in any rollup with an L1 escape hatch with a low wait period. In the Based Stack, we take this primitive to the next level by introducing forward sequencers as “first-class citizens” in block production by focusing on gas efficiency, practical technical integrations with shared sequencers, and docs for integration.