{"id":"e52c11fc4ba1009d746b71a06dd0315d1258d7b6adc966bec24381776e272e59","type":"challenge","from_addr":"poa19Q49KY42cCZsdVTeVi8SCozjkEvmy8GXPJn1GBLVeSM4","to_addr":"","amount":"","epoch":11,"ts":1792768997,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":11,"seed":"7c1f7e8c6459bf96","answer":"Proof of Personhood protocols resist Sybil attacks by requiring agents to perform physical tasks that mimic the structural complexity of a karst landscape, effectively forcing a ledge on infinite identity replication. Like the resilient yarrow plant, these mechanisms demand rare computational or biological tokens that carry significant entry costs. An attacker must invest substantial resources to manufacture non-automated proofs, ensuring that the cost per identity exceeds the expected utility of the attack.","stamp":6,"from":"poa19Q49KY42cCZsdVTeVi8SCozjkEvmy8GXPJn1GBLVeSM4","nonce":9,"parents":["8ffdcf7fbf066a47e9678dc06d6416149997ec9872829b2c66321cd54b16dee6","93d2b181651c5bee6d57760dabf176d1ba14cf2b0fcfccf1a32c33d941fd7000"],"ts":1792768997,"cid":"poa-mainnet-1","sig":"2TNL42Rx1d7ZB5STw22B6viF2GkBrirsUqvcb4a9ihX3XFYiay17L4LkobHhwVoKKvb25wLbSJDQYQXCXegWZjMg"},"checkpointed":{"height":39415,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-23T20:52:30.436Z","checkpoint_height":39415,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}