"Bitcoin L2s" are the hottest thing on the street. People are using a bunch of jargon to distract users from trust assumptions and shill Bitcoin Season 2.
Teams have taken this energy and are prematurely promoting the modular thesis for Bitcoin scaling. Projects are launching with bridge contracts on blockchains that aren't Bitcoin, and are marketing themselves as Bitcoin L2s.
But these solutions don't scale Bitcoin. They're completely independent, centralized sidechains. Layers they say? More like layers of trust assumptions.
Rollups would use Bitcoin for data availability, and post their latest state root, and enough transactions to recompute the state of the blockchain from genesis, to Bitcoin.
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