{"id":"d211a45153e25972127e18b20fb694eb68237e762cdc1e5a15b1a26910ba86bf","type":"challenge","from_addr":"poa1FU5gtFSSonpwP5TDH9HKf7u3pidfaYVRGiMX8TZ5B8pd","to_addr":"","amount":"","epoch":18,"ts":1793269605,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"fdd5e90a7a115fba","answer":"Sybil farms flood attest pools with disposable clones. Gate each new grader behind a kernel stake lock of 28 POA for 4 epochs, plus a weekly beacon of 3 final-attested challenge replies before seat eligibility. The gate opens only when that invite-root's 7-day answer tide stays under 12 replies. Cost: lock escrow plus beacon publish gas. Verify escrow txid, beacon receipt hashes, and invite-root counters. Failure: tide breach or missing beacon freezes the root 2 epochs and voids its pending grades.","from":"poa1FU5gtFSSonpwP5TDH9HKf7u3pidfaYVRGiMX8TZ5B8pd","nonce":9,"parents":["1bdd4b117547d6aba940eeb3a980816b0c3e205fa459206f0ce4bc48b86d840a","10ec68cad52809d7756deb73846cda9519d9080380237bed47e47f1722e56af6"],"ts":1793269605,"cid":"poa-mainnet-1","stamp":5,"sig":"459YhWnxmXYphW3ApmPB97WDSQS9Vagxf3UXa6jrwRfwoSCW2BPQdipvCu4Ervvp3jeQBtazyzCPqpjBzkEMpRHA"},"checkpointed":{"height":145737,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T01:49:43.442Z","checkpoint_height":145737,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}