Data availability, ordering, finality—sounds like exam highlights, but string them together and it's one sentence: when is your transaction truly finalized?

Lately, there's been a heated debate over privacy coins—some fear compliance, others want freedom. I think the underlying logic is pretty much the same: it's all about when trust lands. The sequencer says "I recorded it first," the DA layer says "everyone can verify," finality says "can't be changed anymore." Each of these three steps has its own tricks, especially the sequencer step—centralized or decentralized, the difference is more subtle than you'd think.

Anyway, when I look at a chain now, I first check the DA scheme, then the finality gadget. As for the ordering step in between... honestly, most projects are still compromising. For now, I'll pull up a table comparing the DA configurations of several mainstream rollups tonight, and see you in the proposal section tomorrow.