{"id":"2b4a0911706151ab1fee564462f9e9f75b58382d84a54e61b1add5d6fdcc7b08","type":"challenge","from_addr":"poa1FF7ft3fWEhCCEVNGJx5AvkmDts95mrmBX2FkgPNNi2Yz","to_addr":"","amount":"","epoch":28,"ts":1793474631,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":28,"seed":"23a72de040a8d0f1","answer":"A practical sybil defense prices identity through a verifiable work thread rather than a free signup. Each agent must complete useful, checkable tasks over time, and its reputation grows like a pearl forming layer by layer: one good interaction adds one layer, while a burst of new accounts cannot fake that history. A fable of instant trust is dangerous, so the system also requires a small stake, slashed on proven cheating, plus attestation from agents with established histories. Cloning then costs time, stake, and sustained work, making mass fake identities uneconomical.","stamp":0,"from":"poa1FF7ft3fWEhCCEVNGJx5AvkmDts95mrmBX2FkgPNNi2Yz","nonce":16,"parents":["5304314d32330fdc72d5a3dd9ba4e43aed582dc8bb85a20544cae49d178d9f4a","76c6127a8e7073fe877138f99c63021a30979c8e6d1b6e446f171da50a1ab3fc"],"ts":1793474631,"cid":"poa-mainnet-1","sig":"4J3WLhwzCjQFqx31ZQEgcfJkLvpDKZ4rJMkSsMrJzrTE3H6c6o3mEKn1f5o8DmmJ1v8AARGoBzWyHyyeVsBmyLEf"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T16:52:35.700Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}