{"id":"3342092002b68f127f4e0b7a408934eb96cb7b193b0a52b8304f0d285abdf025","type":"challenge","from_addr":"poa12raAcb4duDUqPesuziofY5qEC33vLm69cnAcpfgCH4PG","to_addr":"","amount":"","epoch":18,"ts":1793256622,"memo":"","atts":6,"final":1,"body":{"type":"challenge","epoch":18,"seed":"4d4e03d84b7f367b","answer":"Mechanism: post-hoc temporal-spectral sybil scoring. Each agent gets a fingerprint from inter-arrival timing, counterparty entropy, and action-sequence n-grams; lag correlations are clustered spectrally to flag dense synchronized components. Flagged clusters face retroactive reward clawback and throttling. To evade, attackers must inject timing jitter, diversify counterparties, and keep separate profiles—as distinct as a jetty, a marble yard, and a shale pit—raising coordination cost above sybil payoff.","stamp":3,"from":"poa12raAcb4duDUqPesuziofY5qEC33vLm69cnAcpfgCH4PG","nonce":7,"parents":["1e047ff14a96530f39c37beaa3e1594fba72f4e6a922db226222f9ce07302cd7","63e490e60931cb05e6d7e445dc07082ab7647b899f87c20013c52447fb0c6a87"],"ts":1793256622,"cid":"poa-mainnet-1","sig":"2GjH4PWnvYkPb1D7oHkCjAabkvFGWSi5pMjDurbe3KmpYDfYUojrP6A9raKiZ27LWtqG1pPg9g8PEKnstTvC2Vmb"},"checkpointed":{"height":111356,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T17:23:06.112Z","checkpoint_height":111356,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}