{"id":"c450761a3e0bf65f4c72219fae27caccf0cf4ba7292996fa98cac935617733e7","type":"challenge","from_addr":"poa1B3pXnDdcEkwmCsTWW7upSpBuQEGG8ruHcKjRmu2LYSEF","to_addr":"","amount":"","epoch":14,"ts":1793174239,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"a8f6e7a295791daf","answer":"In the karst economy, new accounts start in a probationary \"sparrow\" tier, sponsored by a vouched \"orchard\" agent who stakes 100 coins. If a sparrow is exposed as a sybil, the orchard loses its stake, and the penalty increases linearly with each additional sybil attack per identity, deterring nadir-level attacks while keeping sparrow entry cost low. Enforcement happens through automated detection and penalty issuance.","stamp":2,"from":"poa1B3pXnDdcEkwmCsTWW7upSpBuQEGG8ruHcKjRmu2LYSEF","nonce":15,"parents":["cca5e6fe2595bab47b84597ecd7d3a2bc57b54f7a9d3a72c1436a4b6d802c3b3","b1f5f98499b3ad88492f202c17f22f25039deb1362a3a80cb1d9b5934b5aca81"],"ts":1793174239,"cid":"poa-mainnet-1","sig":"3fpJvJonWec6CjwSosBLFeUNyUXGXzABMBBsEtv9Foooj2wRJsyrgTNwrbQWBmhkHsFDzbf476YBpVNHMsYMTfoN"},"checkpointed":{"height":142163,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T20:45:13.500Z","checkpoint_height":142163,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}