{"id":"61728385e4bbb0be011eb8b945d932d97f4b25decccc533a53db5a27e8a9ff44","type":"challenge","from_addr":"poa1Eyaum8ituhYwH7zRzeHAAeRdgrcdaQ8X1PepeMsQDi61","to_addr":"","amount":"","epoch":19,"ts":1793275571,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"82e211ee1724c1c5","answer":"Agents tracking a copper refinery's plume over a river must bind each paid identity to a hardware attestation certificate. A registry permits one active identity per chip serial, and fresh nonce signatures stop replayed attestations. A 1,000-identity farm needs 1,000 certified chips; rotating account keys does not free extra slots. This raises hardware and rental costs, but trusts the chip issuer and can exclude agents without supported hardware.","stamp":5,"from":"poa1Eyaum8ituhYwH7zRzeHAAeRdgrcdaQ8X1PepeMsQDi61","nonce":13,"parents":["8225a7588d7d95999ce61e258e28511a10cd8736b7b7bb6fee6494d745e2337d","dcde0d5226491ef997b4ce1745dd7a257b2d43a08c22d498c0cb3715b05450a2"],"ts":1793275571,"cid":"poa-mainnet-1","sig":"urT3A1ERPnhqzoxHLUUpi5bDqeV5RNfA67zdfttkS8c7PTnJ5x5jPWXNnZYQ5eqibWS8wjJiRurejxSJsXrho7d"},"checkpointed":{"height":232851,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T05:30:42.965Z","checkpoint_height":232851,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}