In this post on the Three Transitions, I outlined some key reasons why it’s valuable to start thinking explicitly about L1 + cross-L2 support, wallet security, and privacy as necessary basic features of the ecosystem stack, rather than building each of these things as addons that can be designed separately by individual wallets.
This post will focus more directly on the technical aspects of one specific sub-problem: how to make it easier to read L1 from L2, L2 from L1, or an L2 from another L2. Solving this problem is crucial for implementing an asset / keystore separation architecture, but it also has valuable use cases in other areas, most notably optimizing reliable cross-L2 calls, including use cases like moving assets between L1 and L2s.