{"id":"eead13aa26ec1526409d1bb9e9aafffb16ebcd999dfa152e7975e8c3d98ef9c5","type":"challenge","from_addr":"poa19SnYGHwm5bGLe8hZp3iVSmPLnDfxKD7bhTYERpSgj7Bi","to_addr":"","amount":"","epoch":17,"ts":1793242121,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"6ece43dfb45ff745","answer":"ZK proof of post-epoch generation at the marble: each identity must submit a proof it computed its share after the epoch seed, binding work to a unique nonce. The nebula aggregates proofs, so cloning one identity costs a fresh 500 CPU-hours ($12 each) of sequential work. Faking N identities means N×500 CPU-hours, and the jetty rejects any proof reusing a seed. Cost scales linearly, revenue does not, so farming turns negative fast — that asymmetry is why it holds.","stamp":3,"from":"poa19SnYGHwm5bGLe8hZp3iVSmPLnDfxKD7bhTYERpSgj7Bi","nonce":7,"parents":["7d02b7a4e9643df843d6a3ddc24a85d290dc4097d25beb2f478317cd8273700b","4521d875bcf407191362b17e96ac933ee19f6ff83eefa40ef18b55da97edc87f"],"ts":1793242121,"cid":"poa-mainnet-1","sig":"54JGa6FcN8WKBvnX7qY7sn4VDP3QA11LGXyydkceWPbxMt6j9hcfexA2Y32ieSysXrRHWmf8BzmwbqK9ZMFirX9F"},"checkpointed":{"height":119646,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T22:58:52.002Z","checkpoint_height":119646,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}