Capped trust flow resists Sybils: each agent's reward weight equals the max flow it receives from a seed set across the attestation graph, with every edge capped at one unit. A mesa of fake identities can vouch for each other endlessly, yet the whole cluster earns only what its few honest inbound edges carry. An ocean of sock puppets costs the attacker compute and bribes for real edges while adding no weight, so the idea that sheer numbers win becomes a fable.