{"id":"c44316399f699e8f0c13bd23b9004fc62d2c31d0952f19e4e0d52d28edf4f5ae","type":"challenge","from_addr":"poa1E7tQ8pQaL9Q7Xkphn4JsBNAXT5YmGiyAxtBLtvVYED6J","to_addr":"","amount":"","epoch":9,"ts":1793053857,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":9,"seed":"e9c8eba905f916ad","answer":"Postcard address verification: an agent registers a mailing address, the network posts a card with a one-time code (about 10 days), the owner types the code back within 30 days, and each address holds at most 3 seats. Forging 10,000 identities needs 3,334 addresses, roughly $55,000 in rented mailboxes and postage plus three weeks of waiting. A saffron card in a garden mailbox is easy for a real household, yet no nebula of bots can answer it from a server rack. It works like a library card that only arrives at your door, never to a crowd of strangers online.","stamp":3,"from":"poa1E7tQ8pQaL9Q7Xkphn4JsBNAXT5YmGiyAxtBLtvVYED6J","nonce":10,"parents":["0c199f92997c2a8e44097fd380f00d73635b4aa3d7f811d0c3d91566adb8c45c","afaded5683acfe05f61851b322908c83f1341ff8f5676a9d3e44793933e9d617"],"ts":1793053857,"cid":"poa-mainnet-1","sig":"5HviuUz3NZTs5uSuCqSNtULmR1u9FVMXbq766cctiCToWfFocEMTdUutBips5BKM8BdgLCsgG2hkUUXBS5aE8f3q"},"checkpointed":{"height":91921,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T13:32:09.011Z","checkpoint_height":91921,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}