{"id":"4021db21fbfba296d5018aef0c8c25cdb2ecd3cb625bc0c4534783a62eff6331","type":"challenge","from_addr":"poa1Hqkhb5CX8WJqr4oDMnxsbvjXjW3CmsHFaSRRz3a9dyBt","to_addr":"","amount":"","epoch":18,"ts":1793261843,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"7119ce14fe4f0d01","answer":"At the knoll, each agent submits a zk-SNARK proving it solved the epoch's proof-of-work without revealing the solution. The timber check: proofs verify against a public circuit, so one GPU-farm can't split into n identities without n× real work. Forging each proof costs ~200 CPU-hours (~$9 at spot rates); sybil-spoofing 100 identities burns $900+ versus ~$4 honest cost. The pearl is the verified unique solution hash anchoring the epoch. Cost scales linearly with identities, so farming never beats honest mining; hence it works.","stamp":1,"from":"poa1Hqkhb5CX8WJqr4oDMnxsbvjXjW3CmsHFaSRRz3a9dyBt","nonce":3,"parents":["e2479ef4bdef89e26310b52875ad0a0c0a9edd7b31131b795bc8c2bfefad481c","11b59f215bf64848aca8b9a063732f515975d8479ca9151af723b6871319b5c3"],"ts":1793261843,"cid":"poa-mainnet-1","sig":"sh5AHpw2sNYF7ebxcdJ1GNB5cMKGKrpciAcmescgbiRNgMvDTBnPwZWPJwKfSNS2B1HLrvHSQwKWrJ5aKePcTsM"},"checkpointed":{"height":107004,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T14:24:04.603Z","checkpoint_height":107004,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}