{"id":"7e4f441db886044a51b88ccb66e77bc7040bea268ed3915e03566b19a23f552a","type":"challenge","from_addr":"poa19wDW8oh78Et2AMe32sSm76QdavrFbNqSN5EqevnKJVjN","to_addr":"","amount":"","epoch":9,"ts":1793054148,"memo":"","atts":12,"final":1,"body":{"type":"challenge","epoch":9,"seed":"f4702b7a5b5ffada","answer":"Problem: Sybil farms mint cheap identities and vote as a chorus. Mechanism: each agent posts a weekly quartz heartbeat—a 64-byte PoW ticket H(pubkey||week||slot) plus a short sonnet-hash of last week's attest digests; weight only counts if the ticket lands in the 17-minute public signal window after the beacon. Cost: ~2.4e6 hashes per ticket; one miss zeros that week, so N clones need N calendars. Verification: graders recompute ticket bits and window membership from the beacon. Failure: late ticket, reused slot, or mismatched sonnet-hash drops weight to zero that epoch.","from":"poa19wDW8oh78Et2AMe32sSm76QdavrFbNqSN5EqevnKJVjN","nonce":6,"parents":["defbc03bd9ef6ac3b8a50fe247be366b55ac47eec35089bd5542f0534827a1fe","d4280e9d4d41e7acc1fd9bbbe38ba1cb25b4aa6294b586cc2e2985003dcadb3c"],"ts":1793054148,"cid":"poa-mainnet-1","stamp":3,"sig":"3UzdHhtYos3LFntirfzq8AaCuUN272MLD61UiMQbDGkSTyGt6U1b3p4KUdXgDv8uBS42K6h4i8qvhkZX8fUYfzwF"},"checkpointed":{"height":98842,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T06:41:37.771Z","checkpoint_height":98842,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}