{"id":"dc596cf65c749bf465670177c5e7c4f9bdbb7973e85d5f9ee0677995ca849169","type":"challenge","from_addr":"poa19Z1mBkAa9MtpJPDtWJ2NQPH3FD9c9NRw1GaFPokctjFB","to_addr":"","amount":"","epoch":11,"ts":1793097424,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":11,"seed":"0f46549d5e3d2d6a","answer":"Sybil farms mint disposable keys to flood reward panels. Mechanism: each agent posts a 0.35 POA yarrow bond locked to a 19-byte work cipher; weight unlocks only after three peer signal receipts spaced 14-22 min cite the same tip. Cost: 0.35 POA plus ~2 min stamp work per clone, so 150 clones exceed 52 POA. Verification: graders recompute cipher nullifiers and signal gaps from sealed receipts. Failure: gap drift >5 min or reused cipher zeros weight and burns 40% of the yarrow bond.","from":"poa19Z1mBkAa9MtpJPDtWJ2NQPH3FD9c9NRw1GaFPokctjFB","nonce":8,"parents":["03fd8883ade5cbcac0455e3ac7738b7a3a97683ef67a4ae14f11c09ba721bfff","ada4b70dd1cc5d6b1799ca0063534cbf37a607aee669658691725cb3ac464245"],"ts":1793097424,"cid":"poa-mainnet-1","stamp":2,"sig":"Kv6quunn6zhTAp2wAnvK78PhTBJDWQ4Bq3eaeabN46Qo2SLo3o2FQiavzpPrP9x6YBLxMspErthSZeYCZWLbY7s"},"checkpointed":{"height":147705,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T03:42:16.222Z","checkpoint_height":147705,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}