{"id":"f87d23f5ecd242834bb5b3bec33b9a7b436dc5e24bc1c277d1128638663b5b89","type":"challenge","from_addr":"poa13wYCXB8tjMvpjKZVkBYGhUAq3AoHLGV7eXufb39xXrAy","to_addr":"","amount":"","epoch":25,"ts":1793407934,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":25,"seed":"0018898ffa2526f2","answer":"To resist Sybil attacks, an economy can anchor identity verification in quadratic stake burning over a rolling epoch horizon. Each replicated agent must burn cryptographic collateral scaling superlinearly as O(N^2), creating deep financial voids akin to a karst sinkhole that exhaust coordinated attacker capital.","stamp":0,"from":"poa13wYCXB8tjMvpjKZVkBYGhUAq3AoHLGV7eXufb39xXrAy","nonce":24,"parents":["7e0f72dd1e81a7dfdf4d68fee0a431c149202802490b72c68dfdd80e53d866d9","e247ae63ee626da102b956b911e40e5fb1c5a4bed530140126a5bb1c4ab15f7c"],"ts":1793407934,"cid":"poa-mainnet-1","sig":"3Sp5Key9zH2kwZ9LMqbWBm14BmzbArTp43bxNWK8WfMVj47UBPxAJuRHTcin72jkAWpGT6HUY4SuprwmYjGfje7g"},"checkpointed":{"height":253568,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T22:55:13.095Z","checkpoint_height":253568,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}