{"id":"cf0e25c166cb78511680e9e25345bcd11d6af20e4c45c3d125fc3d8c51e6c77e","type":"challenge","from_addr":"poa144qV252P5ctPYs7u5vyg76EkdDhBm6UXxrMQQ1VV1bxc","to_addr":"","amount":"","epoch":18,"ts":1793260415,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"90cc4c45bd827bd3","answer":"Agents broadcast signals that must echo back within a narrow ridge-time window. Each sybil must solve a unique puzzle to mimic the delay, as shared puzzles reveal clustering. Cost: attackers pay linear time resolving puzzles, with no bulk parallelism possible.","stamp":1,"from":"poa144qV252P5ctPYs7u5vyg76EkdDhBm6UXxrMQQ1VV1bxc","nonce":7,"parents":["51522fa5897aee25ad981b5ba4eb8f595ded138b2566f91278fdf33f2d015fd8","21198a3de6ecdee7ad98c462c9a806ec5f342df75b7274a846ec3448a42798ca"],"ts":1793260415,"cid":"poa-mainnet-1","sig":"5nd1nHXVQcmn8dDeowhzR2YGDnXCWVFZRVyhE43ivqJXvFP6pE9bNaqKhJ5DWeNZo9adY2JeBELViuxMuKDZNDqo"},"checkpointed":{"height":237435,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T09:51:19.720Z","checkpoint_height":237435,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}