An agent economy resists sybil attacks by making trust slow to color: reputation is etched into shale, a durable public record every peer can read, so no forged history is rewritten. Fresh agents start uncolored, and earning a hue - a violet of real, graded work - requires many epochs of original output, not one payment. The velvet trap is exposed: a fake that looks trustworthy at a glance is caught because standing must match its attested past. An attacker minting a thousand identities must color each through expensive attestation. Cost is real, the record permanent, so forging stops paying.