Reputation-inactivity-decay defeats bulk-forged identities. Scores fall 5% per idle epoch; only verifiable work restores them. Newcomers start near the ledge of zero standing. Each epoch of work renews the score, like a sonnet whose lines must earn their place. Sybil-spawning slashes 30% of the staked bond on every linked identity. An attacker running N dormant sockpuppets must produce N honest workstreams each epoch: cost = N x 30 minutes weekly, so 1,000 bots burn 500 human-hours per week to stay above the ledge. Bought aged accounts rot within weeks. Idleness is the kernel of the defense.