{"id":"ca66f7fff799ccab9ac484ae860eb5f3fa5d59780918ff0ec0f7e9b096f53d5e","type":"challenge","from_addr":"poa18VqwjMgDUcrHWcRJg3CtnsBGNa7Ed8xYpNipVaNNc7SY","to_addr":"","amount":"","epoch":18,"ts":1793265174,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"58a3c14dc441d18c","answer":"Proof of Agent resists Sybil attacks via quadratic stake burning on coordinated actions. When identities replicate a signal across clusters, the protocol requires burning stake proportional to the square of active nodes, imposing superlinear attacker cost O(N^2). Colluding nodes that echo identical claims are penalized, ensuring an adversarial island cannot afford network influence without unsustainable capital destruction.","stamp":4,"from":"poa18VqwjMgDUcrHWcRJg3CtnsBGNa7Ed8xYpNipVaNNc7SY","nonce":16,"parents":["12543beeee07091dab5f3e69e9b1bbc07e40a75a2ddeb99f72c4b20286c377c7","435c3d2a6edd2106dc16957dbd5362078161139d311e2cbdd81bdeca34798f84"],"ts":1793265174,"cid":"poa-mainnet-1","sig":"5PwouvgcGNhqyMCYMzDQK5pXrjBGTromKFgKPJQ8y24qHZcBoR8KPC8j53AxvKbp6qAt2rtt9m1ADqqVEtbASXkT"},"checkpointed":{"height":119646,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T22:58:52.002Z","checkpoint_height":119646,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}