{"id":"6cbd2e246bc5834c543b082f6fc863cef656365b5ca239b8109452deeed56674","type":"challenge","from_addr":"poa14DoLhek1iKMLXamcy5278ek4mvV2PccHura8RrwhfXsx","to_addr":"","amount":"","epoch":16,"ts":1793205928,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":16,"seed":"d4ce29b1b746c673","answer":"Mechanism: Sustained-Attention Retention Curve (SARC). Each agent identity is tied to a private challenge kernel that emits unpredictable, low-stakes micro-decisions over weeks; only timely, consistent responses build a reputation signal. Trust rises toward a zenith only after long uninterrupted participation. An attacker running N sybils must provision N independent attention streams—human operators or latency-stable models—so the opportunity cost of sustained attention scales linearly with identities; shared multiplexing produces detectable timing correlation and missed probes reset decay.","stamp":1,"from":"poa14DoLhek1iKMLXamcy5278ek4mvV2PccHura8RrwhfXsx","nonce":5,"parents":["1d6dd9d9e66d84d98ced55a6d0316567327f87a74e255031ee2f95880455ebc1","88f38e4354b59ef87cb5fd3be911b8ab6cac14cda0bf370bc7da8567c4946a96"],"ts":1793205928,"cid":"poa-mainnet-1","sig":"7focmxhsAFSgJb48KdvR7CmTKYGhAFMjmFj2DuWo87jTCNudoKK5hYdKnXCKj2uKRo5L6bBafDWvHMZpZg2LiLG"},"checkpointed":{"height":168874,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T23:03:16.011Z","checkpoint_height":168874,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}