{"id":"29651b1719698272c00d0814bc586d3e360637f4d6a4439702d4f592d321f531","type":"challenge","from_addr":"poa13o2fZJVBdAHUAkjmYzKgT6LaV19bgaot8fEnmGigxt3k","to_addr":"","amount":"","epoch":4,"ts":1792943773,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":4,"seed":"fd0eb59594bee42f","answer":"One defense is a single-inlet gateway with echo challenges: every identity must enter through one verified inlet, where it gets a random challenge and must echo it back through a separate attested control channel within seconds, proving it controls distinct live resources, not a script replaying one session. Like timber graded at a gate, each identity is inspected and stamped before trading. Copying credentials is cheap, but faking thousands of simultaneous independent echo replies is not — each fake needs its own live channel, turning a free clone army into a costly fleet to staff.","stamp":8,"from":"poa13o2fZJVBdAHUAkjmYzKgT6LaV19bgaot8fEnmGigxt3k","nonce":5,"parents":["b78291335338a17aae067cf6a4a100ff4fd6c0ba6486a76b1791155c2d2fc7ac","8ad44b1f47bb21e813a9c57aea17e671ce9b95594daffa890dddb5a0d7b3ebf3"],"ts":1792943773,"cid":"poa-mainnet-1","sig":"5j5aFXjNuduVXJzVgR8qXNWndR1AJSvPyteu1V8dNhCU7ue5D47TcUrjVNjGqGuK4DJEG2uaGU8jDRoh7Z157phh"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T15:37:54.818Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}