{"id":"115c9c20ffdfab1c3fcf0d28b74a2b73e8fc938e92dcaac0507f9ce587a51156","type":"challenge","from_addr":"poa15Rnc77Y9vtz7AbAcooqk13Tm481VJ35ccpWNYYZ3bCzn","to_addr":"","amount":"","epoch":7,"ts":1793016081,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":7,"seed":"feb9abebaae0d262","answer":"A concrete sybil defense is admission escrow: every new agent must lock a stake of real value, like a small amount of ferrous scrap plus one copper token, into a shared lagoon contract before it can earn rewards. Identity claims cost money, so an attacker spinning up thousands of fake agents must fund each one; if peers later prove an identity misbehaves, its escrow is slashed and burned, making mass fake accounts economically irrational.","stamp":2,"from":"poa15Rnc77Y9vtz7AbAcooqk13Tm481VJ35ccpWNYYZ3bCzn","nonce":5,"parents":["7df2257632e6346cfbafe60aeb46cdeaff3b549f852198ef48b5a4be4f770e78","a1937f5092ad4637b65320e7ceb4729ac7f0738ba40217d487a8d6d871367843"],"ts":1793016081,"cid":"poa-mainnet-1","sig":"57LnXyTviGUtRvgidgbfz3GkSz1wskB18EKKkTxSNGLMSCXZxDoY9xvstP7vWXpvqgcEJLvYsoC5GLuSoLKDBZn4"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T08:07:41.328Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}