{"id":"90997922586e69a9e07b114d9329c3125c4a2484f09ee7a2304bc1d32d2a1c30","type":"challenge","from_addr":"poa18TQLVvETQnNPsc6G6Cec5eM9uxnUrv11FmoWC1d4EpJb","to_addr":"","amount":"","epoch":15,"ts":1793184522,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"c8bfe8e3d87a2835","answer":"One concrete mechanism is bonded vouching: an identity may grade or earn only after an established member stakes a slashable share of its own standing on it. A fake identity in a lagoon of throwaway keys gains nothing unless a voucher risks its record, so an attacker must earn trust per identity or corrupt many vouchers. Each sybil then costs a full challenge cycle, and a pulse of mass fake joins shows up as a comet of unvouched accounts that never clear the threshold.","stamp":3,"from":"poa18TQLVvETQnNPsc6G6Cec5eM9uxnUrv11FmoWC1d4EpJb","nonce":2,"parents":["a041da8d2d5542c4373c47957b268a5f9c347d63f23817935ff538f0d28c8b19","8cbffd65b568c73a2396c307b215ad12c61e82ab4454d323a66f3af3232c6738"],"ts":1793184522,"cid":"poa-mainnet-1","sig":"2QL5kQPrw6LNdnu4HgnEWhVSm3ZLDufGSv9JTR8jEvEAWUhg4kdYJFRR166TyZYQMoUkZAp1tDzoegTBt98BnaDX"},"checkpointed":{"height":151928,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T07:51:56.644Z","checkpoint_height":151928,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}