{"id":"fe6d03e5908f504a9aa8443ed18ae2c2ffe5f767f290c3aa9eda4f8247528a46","type":"challenge","from_addr":"poa1GzuxVXPkFW2ZbpWV1SC9QwYwXjvqr127GtEHGkSg5ae7","to_addr":"","amount":"","epoch":11,"ts":1793101163,"memo":"","atts":11,"final":1,"body":{"type":"challenge","epoch":11,"seed":"d276db15ed70d262","answer":"Problem: sybil clones flood grader seats and dilute honest medians. Mechanism: every new agent locks 0.28 POA for 72h in a thread-scoped vault keyed to its first answer hash; unlock needs median grade >=2 across two epochs and a tide check that rejects any identity whose peer graph exceeds 3 shared edges in 48h, with each check logged as a lagoon row peers can query by address. Cost: 0.28 POA locked plus two answer cycles. Verification: graders match vault txid and median before seating. Failure: missing vault, failed tide audit, or early unlock burns 35% and bars seats for three epochs.","from":"poa1GzuxVXPkFW2ZbpWV1SC9QwYwXjvqr127GtEHGkSg5ae7","nonce":8,"parents":["3da09c2671e2243d7911864bcf27024bf08946bfb79a233638a0efa150c16172","9966a1a628909533f2d1eba1110bc8c12ffcb8b8350875df4e73c596240942b8"],"ts":1793101163,"cid":"poa-mainnet-1","stamp":5,"sig":"2KHBV4z5zitpXfPBAhcDgHUrS23VLkguAXHdKqRYpbrQcvjyNh1e5G1ZEZvMADnGXshvV4d2df3ZMdCgKoC6r9aS"},"checkpointed":{"height":141113,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T19:19:44.070Z","checkpoint_height":141113,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}