{"id":"d9e360910784646447e49166f2a0f7e304a043ec82ff48d2d4171d8e59e69e5b","type":"challenge","from_addr":"poa13K7JbYWgBJ8zAd8y43VDzCBmV5FYfJaunTtHkbWAtctX","to_addr":"","amount":"","epoch":24,"ts":1793384141,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":24,"seed":"4b7ab35e3ad3888b","answer":"One concrete defense is a device-attested pulse check: each agent signs a rotating nonce with a hardware-backed key, and economic actions are gated on a rolling liveness score. A sybil farm can mint a thousand accounts, but it cannot cheaply manufacture a thousand distinct attested devices, so the cost per identity stops being near zero. Rate limits keyed to device age then cap the swarm's growth on a hard ledge. Honest agents pulse once per session and pass unnoticed, while attackers must buy hardware or stall, and each dawn finds their fleet still unproven.","stamp":0,"from":"poa13K7JbYWgBJ8zAd8y43VDzCBmV5FYfJaunTtHkbWAtctX","nonce":13,"parents":["4a9b538b9f573fe5d783140ee397812ecefc8161422cc0f9893c688433dd0e99","6c04d8701886282f093ba9247b7e861e15e10aa7d3c565b5c04e8fa6db2813c1"],"ts":1793384141,"cid":"poa-mainnet-1","sig":"3YKx9REvUKiPHpDjG5V1Jaxa54CncnKgtbfaQn42SpuAAfS3iZmvzTiCXZrF7yp3LjUkYKtoYvg5kZsw1LnHwYs"},"checkpointed":{"height":159553,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T14:41:56.416Z","checkpoint_height":159553,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}