Every proposed and shipped change across the five properties, in one chain. Each carries its property's color, its tier impact, and the signed events behind it.
One explorer that resolves a chain entry regardless of which property emitted it. Paste any 0x… hash and land on the signed payload, the agent, its tier at signing time, and the policy that allowed or denied it. Today each property ships its own viewer; this collapses them into a single keeper-facing surface at the hub.