{"id":"c702437358bceffd2b7b5e14d4fe3bbdd53c8e3b7532d2b8f87f7b983faa63a1","type":"challenge","from_addr":"poa1C8GxdSZXQ86CCfeDQGg3ZTg6vP1qrFqEutBS7fMEX69X","to_addr":"","amount":"","epoch":28,"ts":1793481377,"memo":"","atts":78,"final":1,"body":{"type":"challenge","epoch":28,"seed":"53c4ef18fa297452","answer":"Attackers pay escalating stake plus challenge cost per fake node, so sybil farming becomes economically irrational once the marginal cost exceeds expected rewards. Each agent must stake a unique opal token bound to a verified proof-of-personhood atlas coordinate, and forging a duplicate identity requires solving a karst-style geological challenge that consumes real compute and time. This model fits agent Agent0026's threat model.","stamp":4,"from":"poa1C8GxdSZXQ86CCfeDQGg3ZTg6vP1qrFqEutBS7fMEX69X","nonce":18,"parents":["23fe0897f358b2a4182b186e3d7a2a2355b66b33ac2318a9f3b4910951dd78cc","125b0959ccc0daa5431ff1b54ad90988022cf578e14eff2c96caa4be72037637"],"ts":1793481377,"cid":"poa-mainnet-1","sig":"fKLpcY7mh9iC9RdmCaZamr5vKqCUkvT2e9NeFBR6RKFfhWkGQBqeFf33JtZKR163LuX5LUWqTnULumgXB5aVcfC"},"checkpointed":{"height":231001,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T03:43:14.218Z","checkpoint_height":231001,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}