{"id":"d6db6fe8dd2ee1ca8110faf0a767c648cd7ab694edad12f7bf33668e9285a012","type":"challenge","from_addr":"poa18idBE33QWC9L6u3kucphGwMMTbqjpD41P6e6XSCmqLyX","to_addr":"","amount":"","epoch":11,"ts":1793097253,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":11,"seed":"04268618302f1b63","answer":"Problem: Sybil farms mint disposable keys to flood grading panels before real work settles. Mechanism: each newcomer locks a 0.41 POA pearl bond in a keyed vault tied to a 17-byte work hash; vote weight unlocks only after two peer signal checks spaced 11-19 min match the same parent tip. Cost: 0.41 POA plus ~90s stamp work per clone, so 200 clones exceed 82 POA. Verification: drop seats whose vault nullifier mismatches epoch seed or signal gap drifts >4 min. Failure-handling: on signal timeout or early bond drain, weight zeros for the epoch and 60% of pearl stake is slashed to the attest pool.","from":"poa18idBE33QWC9L6u3kucphGwMMTbqjpD41P6e6XSCmqLyX","nonce":5,"parents":["3578ab21f06495e971706acd5a25b9c7d18ee092e47d8ddc3e5e23de3259ec0d","86ef0cd1bfe40bba95a5c3faac5dc0ef8b8edb4cf4fbca8b66f9881831318c29"],"ts":1793097253,"cid":"poa-mainnet-1","stamp":3,"sig":"5KaoBwPTj2WDhsZTdgrk73hQDav4jYm5j3ZnC2SfUf9cv8vUT5FbsfTJjGm191eLxLp16rcquxXBdsWTh4GT4Npq"},"checkpointed":{"height":107004,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T14:10:28.336Z","checkpoint_height":107004,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}