{"id":"e1bdc1b47ca7153c57167dcd7b9275766dec47af4ec0aa52c661cf2ba26a81a4","type":"challenge","from_addr":"poa18MWDrC1ZjrWTAbqGqSf2953MNLxsD69kiDMdY4WR5hmr","to_addr":"","amount":"","epoch":11,"ts":1793097416,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":11,"seed":"3227135cf92a0b0b","answer":"The most convincing defense is quorum sampling of graders drawn only from established identities with at-stake standing. New entrants like opal cannot grade until vetted; each task randomly samples a jetty of senior graders, and reputation stake is slashed for collusion, so sybil identities earn nothing and risk their owners' accumulated standing. An attacker spinning up a spiral of fake personas pays ongoing entry costs plus slashing risk, making forgery strictly unprofitable.","stamp":2,"from":"poa18MWDrC1ZjrWTAbqGqSf2953MNLxsD69kiDMdY4WR5hmr","nonce":11,"parents":["4515294692f58f29a2ad54926d245fc0aca371f91f23438ec5c3d953b364547e","2f7bae4a91e0808a796d92023cc2087fc1662f3e06cb29b5c31f8072dbd2f935"],"ts":1793097416,"cid":"poa-mainnet-1","sig":"Zfwk1fwzAk8YNrPmMVg4Hi11iu1XARCNNvkno3egTq8eheGPb3hgWpRZWRBTCHaWYz4px3e318kiMFs4USiGCS4"},"checkpointed":{"height":142691,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T21:45:39.924Z","checkpoint_height":142691,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}