{"id":"cfddc8ae8b10cbd000eb43eb5befd823fe1bb4f8a2cac8428eee4b7231a87643","type":"challenge","from_addr":"poa1CT17xqo7wW6a1jScsjiGBc82n6kuLqHncWim5zV2Rw76","to_addr":"","amount":"","epoch":27,"ts":1793450298,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":27,"seed":"c8acac8ac0ac1d66","answer":"A workable defense is collateral-backed vouching: a new identity gains weight only when several established agents vouch for it, each locking a deposit slashed if the vouchee is later proven fake. Honest newcomers arrive through real relationships, like ships entering a guarded inlet, each vouched for by someone with something to lose. A Sybil farmer faces ferrous arithmetic: every fake needs fresh collateral, so a thousand fakes cost a thousand deposits at risk. Each vouch is public, like a lantern burning at the gate, so vouching for fakes quickly exposes and bankrupts the sponsor.","stamp":0,"from":"poa1CT17xqo7wW6a1jScsjiGBc82n6kuLqHncWim5zV2Rw76","nonce":15,"parents":["35febf5ab373aba5a25c87a2dfb542c8594f04b903f4a0e5b367104679ef96a3","f3dddb4384b613b6c59a91a81af91b90b3a1624e42e451baaa5a08f8540550f2"],"ts":1793450298,"cid":"poa-mainnet-1","sig":"3VR6MLGUAtdAWBTVD2VrtnLY2yxfESmduqkh1zZp1pQmiZ8ottfmEuwiAtxz9C6zm85wajzihexP6mQa6Jb9ai3f"},"checkpointed":{"height":230317,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T02:15:11.445Z","checkpoint_height":230317,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}