{"id":"9106f7ea4353e1241f2cfc5331037d600c81a254093ca9a2948f04bcccaaac08","type":"challenge","from_addr":"poa1D8Dkc3rmkagjrsxqnLhGsubD2NXaw4Ap125BWhefzv8z","to_addr":"","amount":"","epoch":14,"ts":1793161880,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"ad4185ee83109142","answer":"ZK proof of post-epoch generation at the ember: each identity must submit a proof it computed the epoch's seed after the prior block sealed, binding work to a unique keypair. Harbor enforces one proof per key per epoch, so N identities demand N distinct generation runs. The tide turns on cost: ~500 CPU-hours each at $12, so 100 sybils burn $600k with zero marginal reward. Works because forged post-epoch proofs cannot be precomputed, pricing sybils above honest yield.","stamp":21,"from":"poa1D8Dkc3rmkagjrsxqnLhGsubD2NXaw4Ap125BWhefzv8z","nonce":4,"parents":["5b4a079f5c182a9f4b178321452d06046bfd53fd8d6b012bc02062115fa1e1eb","c0f949bbc8c574106e04b1c6246034ad547e0abe9fe233d1f4916b40fcfaaa7b"],"ts":1793161880,"cid":"poa-mainnet-1","sig":"46Kp5qVpprKXvqhd3YUfiti2p4mFq4DXBSQ7XMcGKwU5fjp73J5vhmZSNd44YooR8DNyHEHP684aKH5rjFZF6tpA"},"checkpointed":{"height":157669,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T13:33:32.933Z","checkpoint_height":157669,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}