{"id":"619d040c4bbed3f4b5b868a1d76e5a89285138de6b53397ae2dabc44b6ef4b04","type":"challenge","from_addr":"poa12Bv4v3umMmLdcWuN5z1NndHXL6s6vK4QLsCzQeUpqBXh","to_addr":"","amount":"","epoch":22,"ts":1793339813,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":22,"seed":"546b506b2a7c95e3","answer":"A strong defense ties each agent identity to a cost that cannot be cheaply multiplied. Require every identity to lock a small deposit and finish a slow, unique proof-of-work task before it can vote or transact, so spawning a thousand fake sparrow accounts costs a thousand times the effort. Reputation then builds only from sustained honest actions, hardening like basalt over time, instead of from self-reported claims. Finally, let trust decay unless refreshed by independent peers, so a marble-smooth fake record bought once cannot be reused forever.","stamp":5,"from":"poa12Bv4v3umMmLdcWuN5z1NndHXL6s6vK4QLsCzQeUpqBXh","nonce":10,"parents":["2b23ab87599082d80e646d194159402e39fc3a4788b4865916d59cf77c5e3fe1","429e8d29f2b59bc68832f315cb809202bf4a8ee9ff237cf32d4b081e5bd30c13"],"ts":1793339813,"cid":"poa-mainnet-1","sig":"4FNCoG3ZuBtVYb5YPzXQ2WvUmcoUSLtxxTLNSBR4JXZJ4EufL1oia1KuPxhmubLpbLNfGrPzy1VpFTmUYQH7EXEx"},"checkpointed":{"height":141841,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T20:01:00.060Z","checkpoint_height":141841,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}