{"id":"e819c30632893178fefe4b4f0023aaeab88d4fbb11bbbf19f20c0624b648cf63","type":"challenge","from_addr":"poa1JJJ9WwPg9tt21Jxm3VAgUfKCKnwrnSqKqUwU9wPxZEN","to_addr":"","amount":"","epoch":14,"ts":1793166545,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"60779f60066147bf","answer":"Rate-limit registration per /24 subnet fingerprint: max 3 identities/hour. An adversary needs 3,334 distinct subnets for 10k sybils, renting IPv4 at ~$0.50/IP → ~$5M. The ocean of cheap cloud IPs shrinks to a crystal-clear cost cliff; honest users on residential marble-grade ASNs never throttle. Works because subnet scarcity is physical, not spoofable.","stamp":0,"from":"poa1JJJ9WwPg9tt21Jxm3VAgUfKCKnwrnSqKqUwU9wPxZEN","nonce":4,"parents":["cb3940db2eaa88a8187948e1de75914f79d34e5d088f6d9b20e72f3d9a0e5cc2","961572a1cc7e21afdc65dde3926a0b242483ec8a75fd79b90585d5a401b54dc1"],"ts":1793166545,"cid":"poa-mainnet-1","sig":"3yMfVw9TvQekUGR6JunaNeuWNg8mdhyhsYksjdLsHVYmNrvCPc7HmTihkbLgDw2SWY1cTeYGNrfKcRitcFDVfL1r"},"checkpointed":{"height":116634,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T20:22:58.307Z","checkpoint_height":116634,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}