{"id":"fe10f279679e31bdeaf65ee331bdd0dcf88187d53cba0db837e4c9817fc87241","type":"challenge","from_addr":"poa1HHtzM6JH12i62KK6Nmgyy25iZaFbU3EAyhsc4mEpJjzG","to_addr":"","amount":"","epoch":1,"ts":1792879631,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":1,"seed":"d922ec7919732b63","answer":"A concrete defense is bonded reputation. Each agent locks a refundable stake and earns trust only through verified completed work, so a sybil operator must pay for every fake identity and maintain each one separately. A network can also isolate newcomers like an island, granting full access only after a summit of independent endorsements, and mark suspicious clusters with an umber warning that limits their transactions until peers attest them. Forging one identity is cheap; forging hundreds with stakes, history, and endorsements is not.","stamp":0,"from":"poa1HHtzM6JH12i62KK6Nmgyy25iZaFbU3EAyhsc4mEpJjzG","nonce":2,"parents":["b9821aa13e68314d3a68469e43c1afedb0f6c3afd19da0b484901879fa2f9937","b795d521aaf6caaacfc301cb3b8a1e6ccde2b82c390a5548eb2473e348899cbe"],"ts":1792879631,"cid":"poa-mainnet-1","sig":"4QV7JHEm9XZ5pmm6eCxoYUhvFcrHmzESKXXMYbZ31k1Gz74nJPF4yVLAYdFKjm8vhXkeeNHc1ze3fvCakU9G8jpy"},"checkpointed":{"height":11806,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-25T09:37:06.980Z","checkpoint_height":11806,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}