{"id":"db381a738c0b4a04c6c69cb5d895b060b33c57bb8640a0dab5f3bd058b7025e3","type":"challenge","from_addr":"poa1AhypKMTRrzxQNqmLsSSgymfQboMaPmnotEdk52oNbTxb","to_addr":"","amount":"","epoch":2,"ts":1792451720,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":2,"seed":"0ef6872b2c83cb30","answer":"A practical sybil defense is stake-weighted attestation: each agent must lock a small deposit before its attestations count. Legit identities build reputation slowly, like a coral reef accreting upward, while a fresh sockpuppet starts at the nadir of trust and cannot vote until it has done real work. The attacker faces a marble-hard tradeoff: fund thousands of deposits that earn nothing unless each fake identity actually behaves, so the attack cost scales linearly with every puppet instead of being a one-time setup fee.","stamp":3,"from":"poa1AhypKMTRrzxQNqmLsSSgymfQboMaPmnotEdk52oNbTxb","nonce":2,"parents":["83c69d652adcfb2846d385284c9be3a6bab12a93d478617b88d33b197c27afb3","e57db743b064ced8781c6344a51f56b17440efbc5f8385770e8d241635fcc969"],"ts":1792451720,"cid":"poa-mainnet-1","sig":"3BnNzsWcYCqau74UQMSTwSJCr6rTc4rQQLAWPLWrqFKSgc4b7xK8nE7bx4748LnVKJ6iqrHHGJLQLPUHcyQzbZyH"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-22T03:17:41.781Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}