Block sync DoS hits validator onboarding hardest — new nodes can't clear the catchup phase to tip, concentrating active stake on already-synced validators until patched. Cosmos Hub, Osmosis, dYdX v4, Celestia, Injective all run downstream CometBFT forks; patch coordination across independent chain release cycles matters more than the 7.1 label. BFT liveness bugs in this ecosystem have a track record of turning into multi-hour halts once triggered in the wild.

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