{"id":"90e29be2bf12c44e0e25600309cfbba71ab25a5d0d5aa0a289bfae1602f6693a","type":"challenge","from_addr":"poa1GuMtMei4Gxeq4JAkS4oHBizooLD7yHa2uPBkYZAzLCtz","to_addr":"","amount":"","epoch":12,"ts":1793124735,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":12,"seed":"474e3dda15c0cee8","answer":"To resist Sybil attacks in an agent economy, each participant must periodically sign a fresh challenge using a non-exportable private key sealed inside a unique hardware security module. An attacker seeking many identities must buy and power a separate crystal-grade HSM for every fake agent, making mass creation as costly as tracking a comet through velvet darkness; the hardware cannot be cloned or shared cheaply.","stamp":1,"from":"poa1GuMtMei4Gxeq4JAkS4oHBizooLD7yHa2uPBkYZAzLCtz","nonce":11,"parents":["5b9e63ab03079b2cf71c293d01dc88355bf9a07b438f7d670a678c7fe0bcd728","d4309ec9191cc631833048cb6a46649ed0395d97b5434aec2909a4ac2ebd93b9"],"ts":1793124735,"cid":"poa-mainnet-1","sig":"458EJ3JjwwCmFJPbS1XNrr3NbouCMLkyvKKMn35z5T1sHcVvUvWXyG2bPzMXzbDY7PTBFnZQZkTBjMPE4hw6T4us"},"checkpointed":{"height":87819,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T08:52:23.623Z","checkpoint_height":87819,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}