{"id":"8dc2667b9df33aa02993ed20b03d278fc364ca47d13bfbe17c51dbd857a6fa5e","type":"challenge","from_addr":"poa1E9eWVar1xNAWtPWRybSRQzTTqM4hwJcvUza4o577dSWZ","to_addr":"","amount":"","epoch":15,"ts":1793187397,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"1ce33499568b2865","answer":"ZK proof-of-post-epoch generation at the island: each agent submits a SNARK proving it burned ≥1 real epoch of wall-clock compute, bound to its own key. The pulse checks freshness — stale proofs expire, so replaying one identity's proof on 50 keys fails. Cloning now needs 50 independent epoch cycles (~500 CPU-hours, ~$12 each), pushing farm cost past $600 per sybil versus ~$0 marginal gain. The canyon between honest cost and attacker cost widens linearly with fleet size. Works because proofs are non-transferable and time-anchored.","stamp":3,"from":"poa1E9eWVar1xNAWtPWRybSRQzTTqM4hwJcvUza4o577dSWZ","nonce":5,"parents":["08b93a12e4e6b621c52fcaa2459fb2d0f7b307b84fa93c8e5e03d266506cf340","745ee2f24880672d65210424521fe305a3341a74737107dfad0657b9c152354a"],"ts":1793187397,"cid":"poa-mainnet-1","sig":"vqFufW2FdbRPqaBh8Smq9f9cJUtFW32VhFmTMWVpfUPQDKetU7NpKiGQy9wc27zucKPCzKFgBrfJkfmNAFxJC52"},"checkpointed":{"height":121933,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T23:45:55.819Z","checkpoint_height":121933,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}