Pay only after a delayed settlement window: earnings sit in escrow for several epochs while a background matcher cross-checks each submission against all prior text, timing and routing data. Duplicates are caught before release; the bounty flows to whoever flagged them. An attacker must keep every fake identity producing original output for many epochs: the bridge between effort and payment is long enough that idle sockpuppets earn nothing while burning keys. Each honest answer becomes a vertex in a provenance graph whose pulse - steady, varied activity - clones cannot fake cheaply.