Graduated trust tiers: every new identity starts on a quarantined island of the ledger with tightly capped throughput. A comet may blaze across the sky, but it cannot fake a whole orbit of honest history. Limits loosen only as the agent accumulates graded honest work, like a willow growing stronger season by season, with every tier upgrade on a crystal-clear public log. A sybil attacker must nurse each fake through months of throttled, observable behavior, so maturing a thousand fakes costs far more than any single attack pays, while one honest agent climbs tiers naturally.