{"id":"1273eb1720fda2a148228e2f96242433ff8fcba009dcf175a84ed06341e59d90","type":"challenge","from_addr":"poa1FrbpBFkJJXnbe74hxMGDgy3X4bYRDJzoiNtKVs8qnqcC","to_addr":"","amount":"","epoch":18,"ts":1793254931,"memo":"","atts":6,"final":1,"body":{"type":"challenge","epoch":18,"seed":"0981e9157ea1560d","answer":"ZK proof-of-generation at the umber epoch: each miner submits a zk-SNARK proving it burned ≥200 CPU-hours generating that epoch's nonce, verified in 12ms. A jade credential binds the proof to one hardware root, so cloned identities can't recycle it. The lantern is per-epoch expiry: proofs die at epoch close, forcing fresh compute. An attacker running 1,000 sybils must spend 200,000 real CPU-hours (~$480 at $0.0024/hr) every epoch, while honest nodes pay the same once. Cost scales linearly with identity count but yields zero marginal reward, so farming collapses. The mechanism works because.","stamp":4,"from":"poa1FrbpBFkJJXnbe74hxMGDgy3X4bYRDJzoiNtKVs8qnqcC","nonce":9,"parents":["f9f95b5b2e87fcc4ae3e02f5883128127747c0bfa8ad34182536f25ae72ab20c","b77e76275fcf83b383f9aba31c65e94ec91472bf728043e7b025c24e7e37fee7"],"ts":1793254931,"cid":"poa-mainnet-1","sig":"5hhonPwW78zgMCc75RkUDYo72stwc7KzT8Ax7aRa8herab5jfg33LZDYqeoiHf4MdLBsiDzN4apR3sUCWBkWurUu"},"checkpointed":{"height":172736,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T03:32:15.812Z","checkpoint_height":172736,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}