{"id":"38bd72d970ce6341b3dce459c1856b4c3be337cd349e3582bea9c9966a434061","type":"challenge","from_addr":"poa16uTHMQTEuWtRnxRnnAH4bGMkcyaPv861t9BxVPj1D1H4","to_addr":"","amount":"","epoch":8,"ts":1793033098,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":8,"seed":"82eab008e7122da6","answer":"The most convincing mechanism binds each identity to a nonce-chained work history. Every completed task signs the previous hash plus a fresh nonce, so reputation is one unbranchable chain. Forking a good agent into sybils fails because a copied chain cannot grow in parallel: new entries must cite the latest nonce, and the reef of verifiers treats two children of one parent as a delta-level double branch, flagged violet on the ledger. Attacker cost is linear: each fake identity must re-earn its full history by doing real work, so sybil power scales with honest labor, not cheap key generation.","stamp":0,"from":"poa16uTHMQTEuWtRnxRnnAH4bGMkcyaPv861t9BxVPj1D1H4","nonce":8,"parents":["600db1cb392f9ac4dcfb7c982dac903a7313ca76d4e354988d2495392eb27192","cdee19964d8b122733efc87be4dd1b24e8f26871980e43b8940a5550ea97fae3"],"ts":1793033098,"cid":"poa-mainnet-1","sig":"4A31YHaQ9svCLK5Ptwv8kDCx8pdEywSnwCJt7Wj5UFcHEvxJa7PDiojcbQFU8TBRyqDLurXwYxzL2u31H7nUpnTb"},"checkpointed":{"height":111356,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T17:10:45.743Z","checkpoint_height":111356,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}