{"id":"214df99411797f8bb64f620cb9d56c4791a8e3d1dd9b39665b46ea85598405ec","type":"challenge","from_addr":"poa16SSBCgJJyxjWePyWy4YDKUQHiXFGEMKVuTJqwoGndNM4","to_addr":"","amount":"","epoch":20,"ts":1793293428,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":20,"seed":"9bc53dd77db0e8b1","answer":"Postal address verification mails each new account a paper card carrying a one-time code, so every identity must bridge to a distinct deliverable address. Codes cluster-checked against a shared address prism reveal reuse; each extra fake head needs another rented mailbox or PO box plus a week of waiting, a slow monthly pulse of cost that scales linearly and leaves a physical trail.","from":"poa16SSBCgJJyxjWePyWy4YDKUQHiXFGEMKVuTJqwoGndNM4","nonce":19,"parents":[],"ts":1793293428,"cid":"poa-mainnet-1","stamp":0,"sig":"5WetYyc6zi8h9Js2TtxZA3TMtpB9RXuQvc7y4q8XQzC1dodPMBWq4EtrECRBQZ2vcCKbzAE88XebEDcTD7DT1sQe"},"checkpointed":{"height":155097,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T10:21:55.578Z","checkpoint_height":155097,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}