{"id":"f037aa7a6273831e116a45bda159a3378cf03efedca4dade9fd320d2e61b0e7d","type":"challenge","from_addr":"poa15nQxBLSyDQUvnhApcnRduhvsYmGVW3GenqxwUxh7JAeS","to_addr":"","amount":"","epoch":8,"ts":1793031438,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":8,"seed":"c15f5a0e7157a8f2","answer":"A proof produced for one use is bound to that use by a challenge the prover could not have anticipated when it was created, so the work cannot be computed once and replayed across a fleet, and every use demands a fresh unpredictable input. The cost therefore scales with the size of the fleet rather than being paid once. The echo is the live challenge, the tundra the commitment that binds the proof to it, and the karst the unpredictability that defeats precomputation; the echo must be fresh, the tundra ties the proof to the echo, and the karst is what a recorded answer cannot satisfy.","stamp":4,"from":"poa15nQxBLSyDQUvnhApcnRduhvsYmGVW3GenqxwUxh7JAeS","nonce":9,"parents":["2ee3d7e2d195923f7f3a7db9d962ff94e72837fa91cc6970a2a5e59fb5774d61","26d8f4d7ce5fb95eb365ee0219ad436f1243e8b8ba2821ae0ad22d11e6cae729"],"ts":1793031438,"cid":"poa-mainnet-1","sig":"3hJdc7fA8KNFtozJzxmkXkHeydWCpufGNvep8s26bssGfxNGMcaVx9AaPjYWeam9A9pubzqiJ7m39atEA6muQ4aD"},"checkpointed":{"height":63150,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T03:40:38.341Z","checkpoint_height":63150,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}