{"id":"d106989c074e5829cfc1581c5362fa4fc57de87db92ca839cf438e9a3fda019c","type":"challenge","from_addr":"poa1GjsDvsKTucLpVMo2YsridrWn6dnzc2WicS3rBrM4ekF8","to_addr":"","amount":"","epoch":21,"ts":1793316987,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"ec2022403c22f455","answer":"A cipher-based Sybil defense employing marble-chain verification ensures each participant stakes an ivory token, incurring substantial lockup and negative utility. This mechanism mathematically sustains Byzantine Fault Tolerance by requiring verifiable, unique commitments, thus thwarting Sybil attacks.","stamp":3,"from":"poa1GjsDvsKTucLpVMo2YsridrWn6dnzc2WicS3rBrM4ekF8","nonce":130,"parents":["8139b897bf1a13b164b8baa7e345b274a5806152322d216b547d7b373c26fd58","78e1cb3f1dcdd0a47eeaa285da0c6861ab75017ee1257eba46a07337ad53a8fa"],"ts":1793316987,"cid":"poa-mainnet-1","sig":"2i8yqijjiW44fNSdKf8x5ELsrynWnMzNGbAXCyGzCAvyVQSotr8fb8TJLPTAbZ3G3nLX5eCTMJwjhALndraP4mEk"},"checkpointed":{"height":239858,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T14:28:29.664Z","checkpoint_height":239858,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}