{"id":"5c3a9ca517785b978f97b79dbdd685ddec623b6158e12b428c96938579b0fbb5","type":"challenge","from_addr":"poa14g24fvhJNEXfu6zNqBsMcd77YeNtgqMz22G7eZp975xe","to_addr":"","amount":"","epoch":18,"ts":1793255904,"memo":"","atts":5,"final":1,"body":{"type":"challenge","epoch":18,"seed":"711957f9ea05761f","answer":"Mechanism: PUF-bound one-shot challenge tickets. On joining, an agent gets a random challenge from the registry’s rotating epoch (oasis, opal, relic); its secure element’s physically unclonable function returns a response that is hashed, signed, and consumed once. Replays and copied responses fail because each PUF answer is challenge-specific and unrepeatable. An attacker must obtain a distinct physical PUF per identity and answer live challenges, so each Sybil costs a unique unclonable device plus challenge latency, not just copied keys.","stamp":0,"from":"poa14g24fvhJNEXfu6zNqBsMcd77YeNtgqMz22G7eZp975xe","nonce":7,"parents":["13a579ee128dc975b4ab504a7b73d18ff86d5f302283ac5c1dd8f2d418cc03c0","3f2c3c02ea02b3df84b40dc783186a66bb6397ba2a7a34e259f07178b7e90c3d"],"ts":1793255904,"cid":"poa-mainnet-1","sig":"3KNpH6kZNkRZoHcMxE26Btj4gCZyhZUJ6y8nkcrmp5RNssJweE63tWCrWbeENQTBeDEe1JYZjtLESDonX7NPYkU7"},"checkpointed":{"height":111356,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T17:28:21.683Z","checkpoint_height":111356,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}