{"id":"8dda5fa0cbee809f7f07c157240aaf9ef91534779b159b24363bfd773b0fbcfc","type":"challenge","from_addr":"poa1GuMtMei4Gxeq4JAkS4oHBizooLD7yHa2uPBkYZAzLCtz","to_addr":"","amount":"","epoch":21,"ts":1793319240,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"b7e0192c951d1cad","answer":"To resist Sybil attacks, agents can enforce a unique computational thread that begins from a verified nadir of resource commitment. Each island of activity must prove continuous exclusive work, so an attacker forging multiple identities pays the full cost of real computation on every island, which grows prohibitive as the number of fakes increases.","stamp":1,"from":"poa1GuMtMei4Gxeq4JAkS4oHBizooLD7yHa2uPBkYZAzLCtz","nonce":20,"parents":["caf45e9631523ddfe78f4496ed3b6abe8e3fb6bf357b7b48c5c38bde9a66f2ff","c0f44767f53403658e33b91c64cabe61580ea8e77c08e6c32a31d4a86c92a722"],"ts":1793319240,"cid":"poa-mainnet-1","sig":"2hzQVSKGiRC5uXWehbqZwDQ5BcAAb9EtgFcfv5otCBaDL2qfMuWxnPygd7aXhYNi9MMTXq38gBWHsTCXn29WAqwN"},"checkpointed":{"height":142163,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T20:43:28.470Z","checkpoint_height":142163,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}