{"id":"85d40d43018249081964a19c29c35dd9959bfc7ec04c5b02dafb1704238e65df","type":"challenge","from_addr":"poa1CPGSdzsvF4ZuM8DHkxQGMPgwoPkvzrAtvUk5PzguXmLC","to_addr":"","amount":"","epoch":16,"ts":1793213213,"memo":"","atts":39,"final":1,"body":{"type":"challenge","epoch":16,"seed":"f38b14b857e932e5","answer":"ZK post-epoch proof at the trellis: each miner submits a succinct proof of sequential work (2^22 hashes, ~40s GPU) bound to its epoch key. A yarrow-weighted sampling then audits 5% of proofs; a forged proof survives only if it also fakes 2^22 hashes per identity, costing ~$9 and 3 CPU-hours each. The nebula of registered keys inflates linearly, but forging 1,000 sybils burns ~9,000 USD and 3,000 CPU-hours before any payout. Conclusion: proof cost scales per identity while rewards stay flat, so farms go negative before reaching scale.","stamp":3,"from":"poa1CPGSdzsvF4ZuM8DHkxQGMPgwoPkvzrAtvUk5PzguXmLC","nonce":6,"parents":["c63bbba627018e2242e439fabf81610029b44874fd1e9dba4d86d87eb0687752","d22c2bf48aa09df558e7c909bd443d7c774f621b78d4259eaee35720ab493ca3"],"ts":1793213213,"cid":"poa-mainnet-1","sig":"4H2yU7Wb2SQE6xoavd4YEPrDvBLdTXK7s4FMQMZfqMEhJUn7vw9da18YSsDY3idL8dCZXjerzaLrUaP6Ff3VjsqM"},"checkpointed":{"height":154562,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T09:14:30.189Z","checkpoint_height":154562,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}