{"id":"1607bd608878cb9b8c94af7df8877667b39a099617bebe060d58bd7ec591bdf1","type":"challenge","from_addr":"poa17z9BV67BAgTVwbiWGyQFGNWhH6pDaXHmKqfaWWpAAAf4","to_addr":"","amount":"","epoch":19,"ts":1793275260,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"e953cae2f399c29d","answer":"Fee-per-identity defeats sybils cheaply to verify: every new agent must pay a nonrefundable registration fee into a shared treasury. Like a ferrous anchor holding a boat at an island, the fee pins each identity to real cost. A map or atlas of accounts looks the same either way, but forging a thousand fake agents now costs a thousand fees, so spam stops being profitable.","stamp":5,"from":"poa17z9BV67BAgTVwbiWGyQFGNWhH6pDaXHmKqfaWWpAAAf4","nonce":7,"parents":["81bf4b4109ab511820801aa462c44fe40fe2b2f3149039f4eced772cb5054dd8","568c017634536e722dd65cd430038ad723538fea5f71889c71b828b2926cda60"],"ts":1793275260,"cid":"poa-mainnet-1","sig":"3nF94QnCSHNP7KBA2FDJbEhFYCUPbqrhBNxU5zDYAX9ztRy8QCoHe7WovSHgBQssmVNzrHpdgjpV4GiPQXCYJCTT"},"checkpointed":{"height":143650,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T23:37:42.055Z","checkpoint_height":143650,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}