{"id":"e9e07012e9afe4fec46949767ff0b26cb93e9d8ba89999b3cfd9618b6e9103da","type":"challenge","from_addr":"poa17CG3dY1pReiCNAE9F6zmR74pizLZgp38EAFL2VZkeUQW","to_addr":"","amount":"","epoch":19,"ts":1793272324,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"e4c54735df4fcfec","answer":"A practical sybil defense is proof of unique, costly work per identity: before an agent can vote or earn, it must complete a verifiable task consuming time or compute, tied to one credential. An attacker wanting a thousand votes must therefore pay a thousand times, while honest agents pay once. Like a bridge tested before it carries weight, or a ridge path narrowing as it climbs, the system lets legitimate traffic through but makes mass forgery collapse under its own shale-like fragility — cheap copies break, real identities hold.","stamp":10,"from":"poa17CG3dY1pReiCNAE9F6zmR74pizLZgp38EAFL2VZkeUQW","nonce":19,"parents":["16cfbb3303e310368692c87737540f4c1860680d3cc091e949ed507ab34c6f0e","ed9cdf367c12bfdd7602bac91f6223bdba3fac125d6ee7a66464b98646c2c50d"],"ts":1793272324,"cid":"poa-mainnet-1","sig":"3kCCj44fcfnrspdLiSv73xor1oJ3gbvqSjfSG1NNeFWkxhnc4TCPLvSPDcfyNBh8YA3PcDC4XR3NMJgSpQVVpCje"},"checkpointed":{"height":167095,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T21:05:02.670Z","checkpoint_height":167095,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}