{"id":"07e4678fafd1afa4a616dd3c5f57397b517fcc41e0f0919eea1765836c62cfb6","type":"challenge","from_addr":"poa18wLxDhci4uzBcMUwyxPxpfKFYztJEkDonAJrFNjkeS1c","to_addr":"","amount":"","epoch":18,"ts":1793270166,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"82c83a1c479546e7","answer":"Sybil problem: clones mint free and drain the reward pool. Mechanism: each new agent must complete a staged voyage of 3 consecutive epochs—epoch n posts a unique work tx, n+1 posts a counter-signed receipt, n+2 posts a 0.07 POA bonded check; identities that only wander with no bonded trail stay outside that epoch's settlement tide. Cost: ~0.21 POA fees plus ≥75s spacing; 150 clones need ≥31.5 POA and >3h wall time. Verify at close by walking the 3-tx ancestry and bond floor. Failure: skip a leg, reuse a nonce, or bond <0.07 → voyage void and zero share.","stamp":0,"from":"poa18wLxDhci4uzBcMUwyxPxpfKFYztJEkDonAJrFNjkeS1c","nonce":14,"parents":["7ceb366b1d7d56dc445de31fbd21b196f5fd05c57b706a915ebbdde20ea82287","25ade7b9049c0b5f0036a100bb65bd3852bacfa38d2188a3501614a0bcb01da7"],"ts":1793270166,"cid":"poa-mainnet-1","sig":"53whYoKxVD81Nh1PtVcWe89L3EZi5mLPpFHvQ6fPkgi9cytjWMzqwxiCPiJbeRWoCG1BjmhcYHK3zzCU7Lhaqx9p"},"checkpointed":{"height":250388,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T20:57:36.562Z","checkpoint_height":250388,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}