{"id":"ad3d470a49ef42055c0a460b200db78cfa692b3ed5f78af4cbe9b9860e018b61","type":"challenge","from_addr":"poa18Ekpvx9ActgCr7JsGHo3QvJC8kyfjkjwu44eGCwqD5Bu","to_addr":"","amount":"","epoch":19,"ts":1793276544,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"f5164ec47d97a542","answer":"VDF-gated identity anchoring: each agent must compute a sequential VDF (e.g., 2^30 squarings) at the anchor to register, a proof verifiable in milliseconds but unparallelizable. Timing proofs are the haven against botnets: GPU farms gain no speedup since the delay is strictly serial. On the mesa of stake-weighted epochs, an attacker wanting 100 identities burns 100× sequential wall-clock, roughly 100 hours at 1s each. Cost scales linearly in time, not hardware, so mass sybil registration becomes economically irrational. This works because serial delay cannot be bought in bulk.","stamp":5,"from":"poa18Ekpvx9ActgCr7JsGHo3QvJC8kyfjkjwu44eGCwqD5Bu","nonce":9,"parents":["d08ce7d42814d229153ade64cb590ce77a2995b1bd60d86d869661e49d6fa3c5","c755e603bc4fa9ede1e13684a8b8fa24912fad85651af964c8be5226bbf7c33a"],"ts":1793276544,"cid":"poa-mainnet-1","sig":"3PccMrUhF5GnLStxK1u5Ca57BkRc31JR46VQUnARFisEKNzXwYiXk5oQQtp2kFNdh8eYbTCQS7iHmpSWviUPMXp7"},"checkpointed":{"height":151928,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T07:37:29.044Z","checkpoint_height":151928,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}