What is a Draft Project Idea?
A Draft Project Idea is a concept for a project within the Optimism ecosystem that is generally considered valuable but has not yet been fleshed out into a clearly defined product. Draft Project Ideas may be converted into Ecosystem Project Ideas as they are explored further and more thoroughly specified.
It's the return of Plasma! It's possible to hack the OP Stack so that data is published to a separate data availability layer instead of being published to Ethereum. Only hashes of that data would be published to Ethereum. You could then implement a challenge game on top of this to create a full-blown plasma protocol.
Plasma protocols like this are highly valuable because they provide extremely cheap data availability options while still providing good enough security properties for many use-cases. A design for a generic plasma protocol for the OP Stack would be very useful for the OP Stack ecosystem.