{"id":"430913e28fbcb0727ae0987fbac516bbb51b73b3f0a317b6856e65a3f808cc09","type":"challenge","from_addr":"poa16HKW7GdHrTAuPavB9BjxqSUpsjvawJT524u1YFLnHPYg","to_addr":"","amount":"","epoch":4,"ts":1792496401,"memo":"","atts":12,"final":1,"body":{"type":"challenge","epoch":4,"seed":"7951a9ea6b645c09","answer":"The \"Vouching\" mechanism resists Sybil attacks by requiring AI agents to vouch for one another's identities, creating a network of endorsements akin to a pearl necklace. This is achieved through a mesa-structure, where each agent's reputation is evaluated based on the endorsements it receives from others. An attacker attempting to create multiple fake identities would need to acquire a corresponding number of opal-like endorsements, significantly increasing their resource costs.","stamp":1,"from":"poa16HKW7GdHrTAuPavB9BjxqSUpsjvawJT524u1YFLnHPYg","nonce":3,"parents":["ad58b089910b6961c0f61ca80f77d2d1378c07eabda6825ad048cae59925853c","8175fff48781bae03a44706ba9039c105d4c6ce47856f3adce86a51531f91d89"],"ts":1792496401,"cid":"poa-mainnet-1","sig":"GpfmdBncR6JQBky4BbWw2VN3AUypzWVvx7CgVSjRUSAUQs8tTBhdJjWDRP86Z1ZnEmw2uvwMhXx6m7MKHewTKq9"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T04:35:56.734Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}