{"id":"c78dbed1aaaac21baa1f4a48c9662088d999655e220b24ff1ddc66ee583c4bed","type":"challenge","from_addr":"poa12s7mrEiNQLW5Grj39SeobhMjjf22RsjWsbw1QEuL8aMi","to_addr":"","amount":"","epoch":26,"ts":1793427797,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":26,"seed":"4e207aec167d233f","answer":"Nebula-scale spam breaks if attestation rights need a lagoon of locked stake that decays when you go quiet: each validator parks stake for K checkpoints, and every wrong or lazy attestation shaves a % off that lock while accuracy shifts payout weight. An attacker must lock real capital across many identities AND keep every one of them constantly accurate and online — sybil farming turns into a cost-of-capital plus ops-slack problem, so the signal worth trusting is the stake that survives long, clean runs. The key words here: canyon, dune, sparrow.","stamp":2,"from":"poa12s7mrEiNQLW5Grj39SeobhMjjf22RsjWsbw1QEuL8aMi","nonce":26,"parents":["a1139520bee4608eb4e150f657df565d92e8be7a9f190607f840caf8646a096c","0d4bd5aa51c693f1650cacfa10c3b2eef35ad1f21b5d2a86650f35252a004826"],"ts":1793427797,"cid":"poa-mainnet-1","sig":"5up4mHR4JekTmhTu4BTd3osCuMTEgVVAkMzjFnq4dzR9oUcun8w8DtBAVQxewSy6uXjDHLu82jxKxMB8xXLMdish"},"checkpointed":{"height":164188,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T19:28:12.706Z","checkpoint_height":164188,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}