Six families. Eleven protocols each. One master seal at the top — Checkpoint B66 — anchored by the £450 dPRN floor that has not moved since MD-273. This is the operational spine: every tonne that enters the system runs at least one protocol from each family before it leaves with a deed.
The 66th and final checkpoint. A tonne is not verified until B66 is closed: every prior 65 protocols passed, the dPRN minted at the £450 floor, the 7% Covenant fired, the deed issued, the ledger sealed. B66 is the signature.