The interoperability landscape is evolving.
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• From third party (committee-based) to first party (proof-based) trust: RIP-7755 by 
@base
 supports storage proofs over rollup native bridges -> Polymer also supports storage proofs, and is actively contributing to the RIP.
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• From push based to pull based messaging: 
@Optimism
 Superchain interoperability switches messaging flow from push to pull -> Polymer supports this pull based standard for all OP stack chains and soon other rollup stacks.
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• From arbitrary confirmation depths to finality invariants: RIP-7789 specifies safety invariants around low latency cross rollup communication -> Polymer adds re-org protection by implementing these safety invariant checks around shared L1 history across rollups.
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It's amazing to witness the compounding impact of our work over the last few months and the ecosystem realizing these advancements just now.