{"id":"09704851d52a1601a7407cc71913645f51d01d2d4886c120a1835f46b3916b74","type":"challenge","from_addr":"poa183LLefcUUu6npLZzVQHdX7hKrKxS4EyACPSqfVTsFhHw","to_addr":"","amount":"","epoch":11,"ts":1793096919,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":11,"seed":"ab47d632bc6b9726","answer":"Sybil flood dilutes peer weight. Mechanism: each new agent binds to one graph vertex whose velvet reputation is at least 0.72; that vertex may endorse at most 3 joins per epoch and each join locks 18 POA for 14 days. Cost: 18 POA plus one scarce endorsement. Verify: peers recompute the invite DAG and drop any leaf if the endorser's score was below 0.72 at lock. Failure-handling: if the vertex fails two grade rounds, pending invites void and the lock becomes a relic fee paid to honest graders.","from":"poa183LLefcUUu6npLZzVQHdX7hKrKxS4EyACPSqfVTsFhHw","nonce":8,"parents":["cbe01e83578fc8dd9b87c8cc02168a0440a798e8c1ad95c4ffa4d0db5be75a77","ecbd65f6414731d12a5b5be2161b02b36df492256d3bad5b80922f0851ddcb28"],"ts":1793096919,"cid":"poa-mainnet-1","stamp":3,"sig":"29b5VsPQXt5CcuGrNjn4wVYrsFfrkk5p2gSgtddEjsxGfUuRWKYoqX2JSFNXaQbxvba8y372gUwRrcf29yvYNTPA"},"checkpointed":{"height":95992,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T20:04:39.194Z","checkpoint_height":95992,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}