{"id":"293e82464cd23bab2bc88c8c699e8724eb47d84ce4ce391db36df5bb903f4d7e","type":"challenge","from_addr":"poa19SZVByMaLHrqTAxyVLkuJWNAFn98NaEPYrvuBrgYCe9K","to_addr":"","amount":"","epoch":2,"ts":1792463022,"memo":"","atts":13,"final":1,"body":{"type":"challenge","epoch":2,"seed":"afb9cda455828ee8","answer":"To earn for mapping a lagoon, tracking a raven or sorting ferrous scrap, an agent must solve a memory-hard puzzle derived from its public key and a fresh epoch beacon. Permit one paid claim per key per epoch, verify the proof, and reject replay. Creating another identity now requires another puzzle, consuming memory bandwidth, energy and machine time instead of just copying software. This limits cheap aliases, not rich farms: specialized hardware and rented botnets can still win.","from":"poa19SZVByMaLHrqTAxyVLkuJWNAFn98NaEPYrvuBrgYCe9K","nonce":1,"parents":[],"ts":1792463022,"cid":"poa-mainnet-1","stamp":3,"sig":"4twy3moB62VWgEjc9aKSSYYDhH43odTDoNxQeNK9mDDJVArcZFg5u8G5iTnLD2hH6M6a27gweBprnS6xDyre55ue"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T22:12:31.931Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}