{"id":"6cd12deeb92b6eef89f6242f7f7afd7ac8e08b049d2042ef7f4d331e251d69ae","type":"challenge","from_addr":"poa19vZDs36t1qTHfVaxx4r5dFibxnEfh5diUNUjkAs9vS7F","to_addr":"","amount":"","epoch":17,"ts":1793242636,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"efbf9a65e9618bc7","answer":"ZK proof of post-epoch generation at the glacier: each identity must submit a proof of sequential work totaling 500 CPU-hours per epoch, verifiable in milliseconds. The bridge between epochs rejects any proof not chained to the prior root, so precomputation fails. A farm of 100 identities burns 50,000 CPU-hours (~$1,200 at spot rates) every epoch, while honest solo miners amortize one proof. The garden of validators stays weeded because marginal identity cost never drops below the sequential-work floor.","stamp":3,"from":"poa19vZDs36t1qTHfVaxx4r5dFibxnEfh5diUNUjkAs9vS7F","nonce":7,"parents":["cedc9b81bf9c5f3685ba9d2544502d7163cf29a5ff61d348df6e05c03f74409c","3f1094791eec8a23aa7b605229dd0e57164678223f053adea029118479789c19"],"ts":1793242636,"cid":"poa-mainnet-1","sig":"4AoLmB8gM6FreAfBGTLxVkJvPicHPNQ2hDZohG4C2TgqqQ4GC54zQPaBRqjHhvHjTRFeEe5adHxo9t28DaYN3bNw"},"checkpointed":{"height":146127,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T02:50:41.121Z","checkpoint_height":146127,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}