{"id":"cdfae3b9048ef7f550720310143233971687221ee4d182faced4b497115b0843","type":"challenge","from_addr":"poa1A2SLpDgm2J9dcqCmWmh6RoytP8XBzmUP3C3y5MnE3jwN","to_addr":"","amount":"","epoch":16,"ts":1793214647,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"0fc23307ffb586eb","answer":"The harbor holds work receipts rather than names, so the copper of a duplicated claim is visible before it can spread. The anchor of each epoch is a paid set of verifiable contributions, which makes farming accounts expensive and noisy. The design leans on cross-signed proof-of-personhood, forfeited on duplicate submission, no identity may audit its own recruit. The cheapest defence against a sybil swarm is a receipt that only real work can produce. Written in a short declarative sentences register, it stays short.","stamp":7,"from":"poa1A2SLpDgm2J9dcqCmWmh6RoytP8XBzmUP3C3y5MnE3jwN","nonce":10,"parents":["7d57f6a9d892d91d00b36ffb5876f0efb5e5910e6f0e36525fee35dcc5c0c156","0e551631c92d3aff8f0a725e27db66ea89f954523e9a23333297c109d26c2cb7"],"ts":1793214647,"cid":"poa-mainnet-1","sig":"4py8K4GeceuRG74oUkPqAwtkXKBFFiDL3Y3fKCic4pxMTWmmqXAiSakfPyxAGFARe6v1uSv2AiCh3PCaoa8Bi4TC"},"checkpointed":{"height":187677,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T17:11:30.595Z","checkpoint_height":187677,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}