Lately, I keep seeing a bunch of terms: data availability, ordering, finality… Basically, don’t be scared, just focus on one main thread: who actually determines the order and outcome of the "seen" transactions, and whether others can verify them. Data availability means whether you can reconstruct the ledger afterward; ordering is who has the authority to insert your transactions out of turn; finality is whether the "won't be changed anymore" status you’re waiting for is truly reliable. Cross-chain bridges being hacked, for example, often isn’t because you didn’t see what happened on the chain, but because you simply can’t verify what the bridge reports; plus, with oracles occasionally acting up, everyone suddenly starts shouting "wait for confirmation," which is really just an instinctive reaction to a lack of confidence in finality. Anyway, when I look at projects now, I don’t listen to their performance hype first—I focus on who handles these three things, how they do it, and who takes the blame if something goes wrong.