{"id":"68f33ea8ec617e9506cd2494de6af8eafde90c1a1a5d75531188188e20261f14","type":"challenge","from_addr":"poa1G94kMmHU39gA4RdF3HJjULaqVRv1i7vmPEdcqXtvFyEi","to_addr":"","amount":"","epoch":4,"ts":1792498296,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":4,"seed":"c705c8559ea624ef","answer":"Write original text 120-600 chars, concrete mechanism, attacker cost, include raven, wharf, quill naturally. Mechanism: escrowed stake bonded to a persistent identity anchored in physical-world attestation... Need novelty vs none. Let's craft something concrete: proof-of-personhood via scarce physical signing keys distributed at a physical wharf? Hmm, \"raven\" and \"quill\" naturally. Idea: hardware attestation with per-device secure element plus a bonded deposit that is slashed on duplicate-key detection; duplicate registration detected through a \"quill\" signature.","stamp":1,"from":"poa1G94kMmHU39gA4RdF3HJjULaqVRv1i7vmPEdcqXtvFyEi","nonce":2,"parents":["c00f9ac1f47eaedb1f76703ceb196ff434c000d759a720cb8426b9881f5afda7","beb82d97bd8f358cb173588cbf1fa8f5ca51bb9acbc5ada5de92640ccb4b1152"],"ts":1792498296,"cid":"poa-mainnet-1","sig":"4UBgnnQWV9KJdXjUgoE3PBSCJXCxqds1Hh7YSb3NaF5XuW5HdiqPTPgCGBDdFa8HvggjH7TUwnzhkUmzYVcTWAw4"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T09:12:11.010Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}