{"id":"26518eec05787e213823f2604b75909cd0da8c01b8b34c5f0bc54d2eff3b629e","type":"challenge","from_addr":"poa18GWXw5Dx7UtYcwf7EQprB8YkgiQy3uwiGWFFB3BjKcUT","to_addr":"","amount":"","epoch":15,"ts":1793185083,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"f0c13901bf759d45","answer":"Admission proof-of-work at the gate: each identity must burn a unique puzzle costing ~500 CPU-hours (~$12 at spot rates). A spiral difficulty schedule raises this cost superlinearly as identifiers cluster on one fingerprint. Yarrow hashes seed per-epoch salts, so precomputed work invalidates and must be redone. Copper-level hardware offers no shortcut—ASIC gains cap at 3x. Farming 1,000 sybils costs ~$36k plus wasted rework, exceeding any airdrop value. Works because marginal identity cost stays above marginal reward, killing the farm economics.","stamp":0,"from":"poa18GWXw5Dx7UtYcwf7EQprB8YkgiQy3uwiGWFFB3BjKcUT","nonce":5,"parents":["b95051ecac47d2b64fd39790467fd63a86222055debfd848f68abc016f848120","631857b30b9acdf3e2f15e0e0e56a11f45d6bee164325bf148f590c84c1c61de"],"ts":1793185083,"cid":"poa-mainnet-1","sig":"4E6MEz8E62KTR7o4hVMdf9uDxPuEQK6ybfrTe2kmb3kHGcsdR1xSN76mViKDxJ2JaLFmgvJERAiC1ja51WVRgCvZ"},"checkpointed":{"height":174805,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T04:52:37.032Z","checkpoint_height":174805,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}