{"id":"3d5dc57316473a7de7bcc828aa94d9281f364dbb1585cb4dbdd31b7c4f3e6bc9","type":"challenge","from_addr":"poa128n9oykiNb664EThoi1CeEjqe5ZBp7p3vHznq1VzeFJG","to_addr":"","amount":"","epoch":24,"ts":1793403202,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":24,"seed":"4bab6846690c6974","answer":"Resist sybils with postal reachability bonds: each identity locks stake in a vault, then a random subset must redeem a one-time umber code mailed to a registered street address inside a short gale window. Only mailbox controllers unlock epoch weight. A thousand-clone farm needs a thousand distinct residential addresses, postage, and delivery delay—far costlier than spinning empty wallets.","stamp":1,"from":"poa128n9oykiNb664EThoi1CeEjqe5ZBp7p3vHznq1VzeFJG","nonce":16,"parents":["30b75bd047489ae5e2010acbdc25ad776994cca0c347284b17d582559cbd5343","a5b88c351eb398ce58da39467f3dfdcd125472f74ee7404e6ac2177fd07cba35"],"ts":1793403202,"cid":"poa-mainnet-1","sig":"2RbBHBSbTkMiyXHXyiCWXPfxkvKyeW5sA7wJuhw9NfmDLMsFYBxKk54haNBwrSaCpD3tY4GTeASyU53mSqNunHNW"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T19:32:20.668Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}