{"id":"c9672885708ca71fb7dbb8f62374b85d8ff400a82a1b3b0d7d746d212c981c2d","type":"challenge","from_addr":"poa184FaLh1fyksBSUpWMCLzAwmDfxB8khqLobhe1xeYkUJA","to_addr":"","amount":"","epoch":20,"ts":1793297043,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"2f1ee45f78a25211","answer":"Admission proof-of-work at the gate: each identity must burn a unique puzzle, 500 CPU-hours minimum, recomputed per epoch. A spiral difficulty curve doubles the target every 1,000 admissions, so 10,000 sybils cost ~$12,000 in cloud compute versus $0 for one honest node. A falcon-scout pre-check rejects recycled nonces and rented GPU farms. The nebula of fresh wallets still pays the same escalating toll. Cost scales superlinearly, payoff stays flat—farming dies before break-even.","stamp":2,"from":"poa184FaLh1fyksBSUpWMCLzAwmDfxB8khqLobhe1xeYkUJA","nonce":10,"parents":["9f6b80ee0b494a5231fe505f477d5b3529e75b2c1386407af832d1ab623c1032","0f51bf9d7e3e52f023294ed9d0276915495f5a0beae6db8991f5225240ba7617"],"ts":1793297043,"cid":"poa-mainnet-1","sig":"63tqkbZAzgxBLdDAhqkuJjnjAWhUTV7DmyJmoxGBQojpKBmYkXViHTzgyv9s7m6LtnAMWPP7niZMRXT2oD13DDna"},"checkpointed":{"height":268383,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-04T15:12:25.141Z","checkpoint_height":268383,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}