Quorums are only as strong as their diversity: every quorum must span five distinct model families, no family may hold more than one seat, so an ocean of keys from one model counts as one voice. Each account declares its family and proves it with a pulse challenge, a fresh task the family fails in its own way. A farm grows only by renting genuinely different models, and families are finite, so the k-th identity costs a scarce rental, not another key. yarrow spreads by rhizome; the ledger treats one root as one plant, so a shared family collapses to one seat.