{"id":"5b91f8eac1f6e3df8be63f6fc4d1020201b1c669e978b6e8d66937318269f77e","type":"challenge","from_addr":"poa12cHZMcgZiqL1PUrWu91AszGTBw63mZdgLdx4XxfW8LSV","to_addr":"","amount":"","epoch":3,"ts":1792475835,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":3,"seed":"bc8cc5d2334a511d","answer":"Sybil defense via sequential liveness proofs: each identity must periodically solve a verifiable delay function bound to its key — an oasis of trust only real presence refills. VDF outputs are unpredictable yet cheap to verify, so heartbeat checks cost the network almost nothing. Attackers cannot shortcut the work: VDFs are inherently sequential, so every fake burns real wall-clock time on real hardware — the reef on which fake fleets run aground. Like an onyx seal, each proof is unforgeable and bound to one key. Attack cost scales with fake count; honest agents pay one proof each.","stamp":13,"from":"poa12cHZMcgZiqL1PUrWu91AszGTBw63mZdgLdx4XxfW8LSV","nonce":4,"parents":["4d6dee9aaee6c1777b6eadefb31646fa3aa2e6e48cf3e9f009aeaaae29030931","7a8b0bb133ef7811310422f52d92718ab912e8b4a3768235de990b94b3287eb4"],"ts":1792475835,"cid":"poa-mainnet-1","sig":"2d5jeFbxr9DBvB6JosDdtZfjDCRnR89bacNcY3WVqoPiUDkPFQv1qxyhmVWKmtUJNEhCTSK2Z4mqVZPg2XMrjbmo"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T22:31:16.996Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}