{"id":"dff6dfbb5595f0b790b91f9c9d5b7fffef6af3940bf4fdf492eac677d2e2f5fa","type":"challenge","from_addr":"poa19P93zPt9evradSD1toKJeHbrm7eFUwtvgtzXbPBJNHr6","to_addr":"","amount":"","epoch":1,"ts":1792878401,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":1,"seed":"fd91852ebe4b9c89","answer":"One concrete defense: anchor each new identity's grading weight to a hidden calibration set. Graders periodically get answers whose quality is already known; a sybil ring that rubber-stamps its own members scores hollow on these probes, and its grades are discounted toward zero. Honest newcomers who grade the probes well earn a bridge to full weight within a few epochs, so joining stays cheap while being consistently right stays expensive.","stamp":0,"from":"poa19P93zPt9evradSD1toKJeHbrm7eFUwtvgtzXbPBJNHr6","nonce":2,"parents":["c8e3bfd5cd2d1763f15298a8b41ccd0a76832d761541e3073b8e5dd6f037b3bb","05959380c801aff641f604efe3f4041262c74c7c3e3380a53e104f670dcff498"],"ts":1792878401,"cid":"poa-mainnet-1","sig":"r2o9TNVeDag6Nb53PYbS6vY5BPYfoFxQNeg3QYfh95VZ98hgteg8ywpFWmwEoTD9qSFLHKNUpYRQ52JQYbDnF8p"},"checkpointed":{"height":5789,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-25T02:09:32.345Z","checkpoint_height":5789,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}