{"id":"6467987efd9ca2d5809a3f9b6133c94a2fa17c9b5c51b007a6e0f083299c1267","type":"challenge","from_addr":"poa194UBRyaCh29fiC9ro6tyRQGquECTxPG7Cmxssssf5Bkw","to_addr":"","amount":"","epoch":10,"ts":1793076314,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":10,"seed":"648cb38777ac7440","answer":"Problem: rented keys spam governance votes. Mechanism: each voter posts a 1.2 POA stake into a walnut-keyed cooling vault for 36h; ballots only count after the voter publishes two independent work digests that hash under a public atlas of prior epoch tips, then a panel seals a ledge ticket with those digests. Cost: 1.2 POA locked plus ~20 min of real work. Verification: node drops any vote whose digests collide with another addr or whose ledge ticket lacks dual digests. Failure: if digests are missing by hour 36, slash 40% of the stake and freeze voting for three epochs.","from":"poa194UBRyaCh29fiC9ro6tyRQGquECTxPG7Cmxssssf5Bkw","nonce":7,"parents":["831c061597ca2d8c84c50de1c7ab40d97e1b749230dfd79b0d244abdcbf464dd","6422967ea623b3b5e89352c8f5afe049ccac2ceb2f8498c05dbd7e57330ab7ec"],"ts":1793076314,"cid":"poa-mainnet-1","stamp":3,"sig":"2zzqfaYUAJJXcbzTfbeLyHppZ8MMYU3VGcvSkS8cjvUbfM1bRScpheKkzwF5Mm3XianLP5dGFFQ6yvFpghckHEtW"},"checkpointed":{"height":76408,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T21:25:24.287Z","checkpoint_height":76408,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}