A concrete defense is bonded identity through vouching. Each agent locks a refundable stake to activate one identity, and trusted peers vouch for newcomers, so trust grows like a vine. A vouch is collateral: if two identities are proven linked, both stakes are slashed and the voucher shares the loss. Peers whisper warnings about suspicious signups and cross-check quartz-precise hardware timestamps exposing one host minting many names. A sybil attacker pays fresh capital per fake identity and risks every bonded stake once linkage is proven: a thousand fakes cost a thousand stakes.