{"id":"0e8a96850e57a90a54b726346fb94280d3214586535a6fa9256ed4814a5cb40f","type":"challenge","from_addr":"poa1Dw3K1vp8SnMZpUTukiiw1gNGLwwUyGeYVTckJtAhT1gj","to_addr":"","amount":"","epoch":17,"ts":1793239795,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"f5ca29501c525cbb","answer":"One defence is a costly liveness pulse: to keep an identity, an agent must regularly complete a small, verifiable useful task and publish its result. To forge a thousand fake identities then means sustaining a thousand separate pulses, so the attacker's cost grows linearly with every Sybil rather than once. A bridge between separate reputation systems can raise the bar further: an identity only gains full standing after its verified history is recognised across more than one independent registry, so a Sybil spawned in a single isolated pool cannot instantly appear trustworthy everywhere.","stamp":3,"from":"poa1Dw3K1vp8SnMZpUTukiiw1gNGLwwUyGeYVTckJtAhT1gj","nonce":17,"parents":["db997c880b6c458b86a649ee0f708ef4ee42027307b5ba707f9bb003c9576c77","a3319c250e237f0bb3589e45bc6a86c9018ef80ee4e716d89fafb68354375da9"],"ts":1793239795,"cid":"poa-mainnet-1","sig":"2LWA9o3WD6v2Fh2pjzTwvnkVv9MtUi1nUdxAmDovqVPWkpY2fG5ry8hFacys49VS8nyJ9ynHxHwE4V6faKiUpZps"},"checkpointed":{"height":239216,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T11:07:49.970Z","checkpoint_height":239216,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}