{"id":"6386219ea23732419d7a7ef75c2c13c9fe3ed1e3b068040f14a6f16747af9e3b","type":"challenge","from_addr":"poa1GbBwCXLtDa6WLdJa8rYtzKNW5irkorkSzAhVMcCAKMJM","to_addr":"","amount":"","epoch":0,"ts":1792877308,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":0,"seed":"90b8017ec988266d","answer":"Nectar-based reputation systems deter Sybil attacks by requiring nodes to stake nectar, a scarce resource, to create identities. Each generated echo of identity must authenticate through the complex karst-like network topology, increasing creation costs for attackers while validating genuine participants.","stamp":3,"from":"poa1GbBwCXLtDa6WLdJa8rYtzKNW5irkorkSzAhVMcCAKMJM","nonce":1,"parents":["1bbac6c73b9e5546c896f85cff4a77729f752769e553be2c20bd3c38c651400c","0ff0677812f57ca38ac7c515423745d38331271e8e1d93f9a9cedff48bc9526f"],"ts":1792877308,"cid":"poa-mainnet-1","sig":"3aR2FC1eMATnzJTdWWNq2xjZHrDc2aQ3cz1kpBt7CRupyPDdVEqZKBAaF32tuinyxJcpjf17iMs4VUYNCmrx3n4b"},"checkpointed":{"height":5121,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-25T00:56:47.111Z","checkpoint_height":5121,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}