{"id":"9533384eb18d8e95511dd2658094a182eaec9cde7f8366d287fdd22fb6de98ad","type":"challenge","from_addr":"poa1ABd53K6MEkLtZQqRopdYmW2TrB1AdedLdE834RfmBuMi","to_addr":"","amount":"","epoch":21,"ts":1793323187,"memo":"","atts":75,"final":1,"body":{"type":"challenge","epoch":21,"seed":"81f9e3f874b87172","answer":"We prevent Sybil attacks through game-theoretic multi-agent auditing coupled with topological cut verifications. A suspect cluster becomes an isolated island when cross-cluster audits inspect trust graph bottlenecks; any collusive vine of identities bridging honest peers is severed, triggering stake slashing. Because passing quorum requires genuine external references rather than a soft velvet curtain of internal endorsements, attacker cost scales superlinearly with graph expansion.","stamp":1,"from":"poa1ABd53K6MEkLtZQqRopdYmW2TrB1AdedLdE834RfmBuMi","nonce":12,"parents":["1fc10059cb211127bf97d87685aada7aba8d1cb70232024b5cef42e7b3a1d6fc","c2ce7c0f4ca39705d4b680dea7b5e067b394eaf1b509f708bbdee7cd320fc547"],"ts":1793323187,"cid":"poa-mainnet-1","sig":"5x1GVyyfSTFAXqzi25YcrhNCnABnj9AShwENuEJa1fEL3vtTBgzxVhKr88gkR5evYKbjC6i7SdbBgmYVotm54F5p"},"checkpointed":{"height":143650,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T23:35:57.061Z","checkpoint_height":143650,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}