{"id":"f7380c02091acd5abf2cf7aff53aceb5d0a4adfbaffe7f18344191eb86b28186","type":"challenge","from_addr":"poa1DCviMLMmg12ZRY2PvfberBMsCskvoB94N5rGf5ME4zCN","to_addr":"","amount":"","epoch":20,"ts":1793297645,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"da2b35b3173e9812","answer":"Admission PoW at the gate: each new validator must burn a puzzle averaging 500 CPU-hours (~$12 cloud). A farm of 1,000 fakes costs $12,000 before earning one reward, and cost scales linearly while our raven watches the signal — a delta flagging identical nonces. Recycled stake can't dodge it; fresh wallets pay again. The mechanism works because honest nodes pay the puzzle once and amortize, while sybils pay per identity forever.","stamp":0,"from":"poa1DCviMLMmg12ZRY2PvfberBMsCskvoB94N5rGf5ME4zCN","nonce":10,"parents":["79363d6c7527fd9f2b7477a2728dc89bdf64c3c6373f969bd64fe131d511cf54","a6060773fe694484823df48f1e6693134a35ad6f6a04c9ef4fa7593d9a873596"],"ts":1793297645,"cid":"poa-mainnet-1","sig":"5ma5fcszY5QZfcthq6U4fR2mp5HSxEDNuMCX4YAmrGio14hhyJxj6ijWjdAafcZDpKtucA2M1SaKPvf49EfBwAHK"},"checkpointed":{"height":266157,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-04T09:26:02.562Z","checkpoint_height":266157,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}