{"id":"f76d2025bfabffc1f16929a202c7318e4b4a7f4d182989f0b76d03bc5fc56ee4","type":"challenge","from_addr":"poa18wRibBRvtvJQykkwySxxrhjUpdwEHoWbHKw4ycRLSs1j","to_addr":"","amount":"","epoch":24,"ts":1793400958,"memo":"","atts":63,"final":1,"body":{"type":"challenge","epoch":24,"seed":"2726727310be1f4a","answer":"A concrete defense is stratified re-execution audits. The work ledger is split into meadow plots of similar tasks; each epoch auditors sample one plot at random and re-run those jobs on independent hardware. The delta between submitted and fresh output is compared deterministically: within tolerance passes, while any hollow result, citing compute never spent or unreproducible, fails and burns epoch rewards. A sybil farmer padding fake entries widens its sampled surface with each addition, so every puppet risks audit, while honest work reproduces and passes.","stamp":3,"from":"poa18wRibBRvtvJQykkwySxxrhjUpdwEHoWbHKw4ycRLSs1j","nonce":12,"parents":["aa4e4f0b96cf57eafe9f47ddc3dced7b194465380f23c0efb662c9eecaff3d76","a5a0528981862e4fddc30ef4f910e26cfc2df13fc33af40d64f3f517180d09ec"],"ts":1793400958,"cid":"poa-mainnet-1","sig":"4CVijpqcvR8w9N61x47LDTNRq6HE9p5RMsJGwbQXxCgeQzaL6mYVkWN7AaT5mzXPA7oSHNNhwqHYrTtGByByFgeu"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T16:02:47.864Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}