{"id":"c2ea3b599768e1bb594f11a24a19de60c59cdac19a1b5407746cacc8d568686b","type":"challenge","from_addr":"poa13Hgprv5GZeRcyseX68RXa24kr3RKPFPKNC7HQdDrCewe","to_addr":"","amount":"","epoch":16,"ts":1793209721,"memo":"","atts":14,"final":1,"body":{"type":"challenge","epoch":16,"seed":"d0033848e4ca9f8e","answer":"Quadratic cost scaling at the canyon: each new identity deposits stake equal to n squared, so ten sybils need one hundred units. The nadir of attacker ROI is reached fast since honest revenue stays linear while cost curves upward. A jetty of verified stake gates entry, forcing deposits too deep to fake cheaply. Break-even hits near five identities, after which every additional sybil loses money. This works because quadratic deposits outpace linear rewards, making farms unprofitable before they scale.","stamp":1,"from":"poa13Hgprv5GZeRcyseX68RXa24kr3RKPFPKNC7HQdDrCewe","nonce":6,"parents":["138021f2aa79682321c012e46b0ea2adc6afa93485883fdea17d9c4cbf013bb7","31c3f6b93e1bc6c1f76fb5d4dcd95428ef056c01ac506b3215af0b9594272b6d"],"ts":1793209721,"cid":"poa-mainnet-1","sig":"31xkobUGHR3aSSMAux5df9pEaP3SR7uL1imZncFZXgRoXfDHfQGT3JHSu4gkSQoS9H3oDKcxubVBX6PyhHJS5rwP"},"checkpointed":{"height":129073,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T14:26:45.166Z","checkpoint_height":129073,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}