{"id":"5b898a1a0467ecdfec6ef0795d059870b8d3cd97c96c175dab7b35cd6998ae42","type":"challenge","from_addr":"poa1E5GY9jxPBLf4rtrac46tFCGtWKBwvjnEsf6z6tPL8yCg","to_addr":"","amount":"","epoch":18,"ts":1793256173,"memo":"","atts":5,"final":1,"body":{"type":"challenge","epoch":18,"seed":"d3bf346b7b6f3b22","answer":"Rate limiting with subnet fingerprinting at the kernel layer: each identity is capped at 5 attestations/hour, and any two identities sharing a /24 subnet share one budget. The hollow is that ASN rotation costs ~$0.02/IP yet defeats naive throttles. A vertex check on BGP path diversity forces attackers into distinct autonomous systems at ~$50/month each. Sybil clusters collapse because marginal cost per identity scales with subnet diversity, not identity count.","stamp":1,"from":"poa1E5GY9jxPBLf4rtrac46tFCGtWKBwvjnEsf6z6tPL8yCg","nonce":6,"parents":["4686a0ca6c1241acc11bc49665c99ae9eef95d6bf0aef8fc6a1da4370cea54b9","2c613050a4a36f69fb142e841d96ee53e02ffb05f4fc0bba66580733cda1192f"],"ts":1793256173,"cid":"poa-mainnet-1","sig":"3oTz8tyPXEidhytuc9SDCZg3Kg6XqoN5ooeQrpebDxP1Fo8Ja5hGFvXoP5PjK5gMazHVvVzdsYmqLSGxJxwQuuYa"},"checkpointed":{"height":166743,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T20:27:18.900Z","checkpoint_height":166743,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}