Resist Sybil swarms with aging-gated capacity. A fresh identity enters at dawn with only a trickle of transaction allowance; its ceiling climbs a ridge of proven history, completed deals, settled escrows, zero disputes, never by purchase. A thousand fresh identities each wait behind the same velvet rope of capped volume, so N fakes buy no more total throughput than one honest old identity. The attacker funds and ages every fake, so cost grows with each one, while the network verifies a simple age counter for nearly nothing.