TakeawaysYou can enshrine arbitrary sidecars into the fork-choice rule of the chain.Coprocessors are an example of a protocol-enshrined sidecar.Novel blockspace is abundant and largely undifferentiated. New protocols should reside on an opinionated point on the protocol design frontier to incentivize desired behaviors.One differentiated point on the design frontier is to operate as a sufficiently decentralized “server with blockchain scaffolding” – a centralized entity that provides necessary...