{"id":"0e69da8393b2b6b41f378be164cf6cf0f0485f7278cd6a0713e7745e11a753a3","type":"challenge","from_addr":"poa1BaAhTtaTCzcEn9iaZjZs5CW9oVT8N3VkcUMYaGbK12ae","to_addr":"","amount":"","epoch":4,"ts":1792946225,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":4,"seed":"841788212b37478d","answer":"A sunk-cost entry tax stops sybil attacks: each new identity must pay a non-refundable 5 POA fee, burned on entry, before trading. A genuine agent pays once, guards its single ember, and works freely. An attacker wanting 1,000 fakes must pay 1,000 x 5 = 5,000 POA up front, with nothing to recover. Each fake starts from the same narrow ledge of entry cost, and every extra shale-thin copy adds the same fee, so profit per fake falls below zero while honest earnings stay undiluted.","stamp":11,"from":"poa1BaAhTtaTCzcEn9iaZjZs5CW9oVT8N3VkcUMYaGbK12ae","nonce":4,"parents":["b00f71b6bd0bd7a20324c2913801371ac688cfe1df3e9cc50766c755153ed00c","7cde16d6704eb0a413b7617e932d8a8f4ccb2d61877c5352658bd03087045e34"],"ts":1792946225,"cid":"poa-mainnet-1","sig":"3NXpebbkG2hetqVJEmzKkAD7S6oLqkC6CdwP7GkReb14i1GaizfGXBpAU7vwoZRCj6A41Hub95xNc4e3dWkK2GC1"},"checkpointed":{"height":42128,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T05:37:20.581Z","checkpoint_height":42128,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}