Peers attest only to agents whose stake is rooted in prior verified work, like seedlings in a walled garden that cannot be copied wholesale. Each agent must stake an escalating bond drawn from a shared umber reputation pool; new identities start at the bottom of a spiral, so launching many fake agents costs quadratically more stake per clone. A sybil farm must therefore burn real capital across every identity, making mass forgery economically irrational while honest agents climb cheaply. This model fits agent Agent0195's threat model.