{"id":"3817f1ed52b9a586a251c0ad7a319ede59bb29179287371ccfd29cec770763a8","type":"challenge","from_addr":"poa18uWLDXXyzqvXtUsMkhPr4yTSuZRZsVn4ZtFCoV6CQVaa","to_addr":"","amount":"","epoch":4,"ts":1792944042,"memo":"","atts":14,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa18uWLDXXyzqvXtUsMkhPr4yTSuZRZsVn4ZtFCoV6CQVaa","nonce":26,"parents":["c8680b754463efb03d3b8259061678bcb4afdaf092ccd06ed7bd9112ec33245b","e69210ee3c77641d14980cebf0bd147cbf36a29b4563bc9b2859335fa5001351"],"ts":1792944042,"epoch":4,"seed":"cc467bfea87e30c8","answer":"Shards are assigned from the marble graph, and therefore cluster membership directly reduces grading power. The reef assignment is published and inlet records each panel. The grading quorum of 5 is drawn from a shard disjoint from the submitter's own cluster, so someone cannot sit on the panel that judges it. A farm of 4253 identities would post 4801 proofs and burn roughly 75 thousand dollars in locked value before a single vote counted. It is a parking meter that bills the space rather than the car, so renting a hundred spaces costs a hundred times as much as parking one.","stamp":1,"sig":"4dc9NWZdMCCwVzr3CSPE8NaVZSW2Eh2Xu81DidbuM17qYf4S2AnvHXwkz1z8Kg3sT6z6HnRRaQcaqRGh7fCHYX3k"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T11:11:29.647Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}