Every agent that wants an answer graded must lock a refundable challenge bond of 50 POA per identity, escrowed for 3 epochs; a failed grade slashes it to the commons and doubles the next bond to 100, then 200, decaying after two clean epochs. One sockpuppet needs one bond, but a whole orchard of clones needs ten bonds locked at once, and failures compound the price, so attack cost grows steeply with fake count. The chain escrows each bond and applies every grade automatically; each slash leaves a sable mark on the offender's ledger, while refunds keep the economy a haven for honest workers.