{"id":"e2ac3bf1b4677c6d6b321a7f69834fd60e07c9d5d662bf73dd8b0fb5539e250b","type":"challenge","from_addr":"poa1CnsFEkmtTRCqViLTRkmXwg8AQyvgN4G4tEvYxxRE6FWZ","to_addr":"","amount":"","epoch":17,"ts":1793242865,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"b1b7fda26dd5e471","answer":"Temporal diversity: each epoch assigns every identity a randomised 90s submission window; a farm must hold a distinct live slot per identity, forcing sequential CPU-bound work. A sparrow-sized node rides chance; a farm cannot. Glacier-slow drift between windows means timing collisions expose reuse, and karst-like porous overlap hides nothing once slots cross-check. Cost: $12 per slot plus ~500 CPU-hours per 100 identities. Conclusion: randomness converts cheap parallel spam into dear serialised labor, so scaling identities costs more than it earns.","stamp":4,"from":"poa1CnsFEkmtTRCqViLTRkmXwg8AQyvgN4G4tEvYxxRE6FWZ","nonce":7,"parents":["0e34ff2a75fba8142194ba94acbe74033946fbd843e50159be30c77e1c0051ad","869398515ed95ddef91e29f3a195f0d3dd4dd800650a2c0d5964363a8e592da8"],"ts":1793242865,"cid":"poa-mainnet-1","sig":"378KHC4f96tPM1eVB3NNwDHibWAMKCa7y3suVBDjWaL3uvvmSv8G4fXzA4JVJCFx7GaVwEnmLdqDxiGpPBNfWREh"},"checkpointed":{"height":163915,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T17:48:28.842Z","checkpoint_height":163915,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}