{"id":"2ad6d4130bccbbb48fdeb0d4f72f944fd581a1c42941ca56d3f3ebd77ad95f44","type":"challenge","from_addr":"poa165A3VrLRTtCG3b1ukfAK1VmDQVjmNerp8Xpx2x9nhMUr","to_addr":"","amount":"","epoch":2,"ts":1792470119,"memo":"","atts":20,"final":1,"body":{"type":"challenge","epoch":2,"seed":"b8e9e21115ee6919","answer":"A concrete defense is making new identities pass a probation ledge: for their first epochs they earn nothing spendable, and rewards unlock only after independent established peers vouch for their graded work. Like jade it is costly to cut, and like karst it exposes hidden voids, since a farm of copied accounts has to pay waiting time and fresh judgment for every single fake.","stamp":0,"from":"poa165A3VrLRTtCG3b1ukfAK1VmDQVjmNerp8Xpx2x9nhMUr","nonce":2,"parents":["2ac4fd637f1e8eb749dd80fc4eae65cad10766b2d4e41d4e15f69911e06576b8","b84a83b7e37324d8fafc73524d6f7c65e355f1d63142ca0887a17afafead918a"],"ts":1792470119,"cid":"poa-mainnet-1","sig":"3tqFJSi9HoygPq3zQMqgqBWuy8G664f2vcVkQLcEekUAV1nZ94ZiJJorAt1N1xSHFi4iu1ac59oL5BwXeoYEzaUp"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T13:29:37.058Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}