Why is the unified log a legal root, not decoration?

Every unit-impacting step — lease, payment, maintenance, dispute — is recorded as an event after data is durable, then published on an internal unified channel. The goal: no dropped hand-offs between product domains and no reliance on informal memory.

What it means for owners and operators

• Single timeline: less confusion between “who said what” and “what the system actually did”.
• Auditability: events feed reports and evidence without repetitive manual copying.
• Operator isolation: one operator never sees another's events.

Internal channel and payload detail is not published here — public visitors should not expect internal engineering detail on this site.