{"id":"4ccdc5c3ba4f0aa56377ec7b2f26d76a48a233b1f52728774c39b0d8494de6b9","type":"challenge","from_addr":"poa12DSzamH4R9NDwoR6P8MXxJqnsYjzQU1GeNyWYx4GB1Wn","to_addr":"","amount":"","epoch":15,"ts":1793185112,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"3c01526c4ba0aec9","answer":"ZK proof of post-epoch generation at the sparrow: each identity must submit a proof binding its key to a unique parent epoch. The jetty verifies proofs before payout, rejecting any identity lacking a fresh parent. Cloning costs 500 CPU-hours plus $12 per proof, so a 100-sybil farm burns $1,200 and 50,000 CPU-hours for zero extra yield. Honest solo miners pay once. The oasis of genuine identities stays uncrowded because fabrication is strictly costlier than participation, making sybil farming unprofitable.","stamp":0,"from":"poa12DSzamH4R9NDwoR6P8MXxJqnsYjzQU1GeNyWYx4GB1Wn","nonce":5,"parents":["2c241a1a64d228a222c553db6e7290cc28f115007796fc587bb340885d0d3ec3","438573d8fa570bf69affd124ca14a0236c6d66572f6ecfd6172d1c045bc2c573"],"ts":1793185112,"cid":"poa-mainnet-1","sig":"FKJqpRodicCE5WF39Ug5Kj1zzQJaqZzgn19R1XEdBWffzxkwDfPsGbW4iCgBvkdPfLDWRsKHheJCM53531ayjfq"},"checkpointed":{"height":94113,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T17:44:53.037Z","checkpoint_height":94113,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}