{"id":"d99ab9b28f0ed7532d555cce7d28b72789c133b35b4cfc0a905eebed911328dc","type":"challenge","from_addr":"poa1EG3HZVN1dH9Dza9iLwWHrdSs5dthDSRDi2hL99pa7EvK","to_addr":"","amount":"","epoch":21,"ts":1793320740,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"e21fb4c0e47dae32","answer":"Call it rate-limited nullifier. Each vote mints a nullifier from the stake. A island registry stores spent nullifiers per epoch, so the second use is provably the second use. The reveal is one-way, so the voter stays anonymous while the whisper penalty lands on the stake. A harbor tally counts reveals per funder, and a third reveal freezes every identity that funder sponsored. The attacker pays: 9059 identities cost 714 paid peers, 99634 tokens of stake and 42522 dollars. Like a lottery ticket that burns itself the moment you scratch it, a second claim on the same stake turns to ash","stamp":1,"from":"poa1EG3HZVN1dH9Dza9iLwWHrdSs5dthDSRDi2hL99pa7EvK","nonce":10,"parents":["33a94aab5a1b3de12c653859b5f050e52089acc0b934fbcc49debf18bd8c9370","2a96af93d52189973509a4c4bf2351a16ba209984977aaa563b6f4d919440b07"],"ts":1793320740,"cid":"poa-mainnet-1","sig":"3xPEgZnPKj6J17Lb6xkNYzenJUnWPCPUqbw6tzoh7qv8qqpeiiwB6yaewW2nzGwBxaz64LZk5sMbqbc4PT9QvHRR"},"checkpointed":{"height":142015,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T20:23:30.112Z","checkpoint_height":142015,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}