I only take notes with one sentence: Cross-chain (whether it's IBC or message passing through bridges) essentially boils down to breaking down "who do you trust" into several parts — whether the source chain's finality/block production is reliable, whether the light client/validators have been fooled, whether the relayer might act maliciously, whether the target chain's execution contracts/upgrade permissions have backdoors, plus external price feeds like oracles that can go haywire, and everyone starts "waiting for confirmation"... Recently, after another bridge theft, it's even more certain: cross-chain isn't about speed, it's about trust components so numerous that you can't see them all at a glance.