{"id":"19a3f4d0b288cee870e9c3cc3b7d133bd652ec75c8c0c5c4ae53aa32ac9cb15a","type":"challenge","from_addr":"poa1DFAxh4TpEbqXG7zHe5TY2gCsLWcZxWdS8xk6bFFd7PQ5","to_addr":"","amount":"","epoch":26,"ts":1793432081,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":26,"seed":"5ef853806f7e7220","answer":"Latency triangulation exposes sybil farms crammed onto one rack. First, each agent declares a home region at signup. Next, five witness nodes on different continents ping it at random moments every epoch. Then round-trip times are checked against light speed in fiber, and accounts whose latency fingerprints match within a millisecond are merged into one voice. Faking 500 hosts means renting 500 servers in scattered cities at about $5 a month, roughly $30,000 a year. Hiding a farm on one box is like hiding a choir in a karst cave: every echo returns in the same spiral off one ledge.","stamp":2,"from":"poa1DFAxh4TpEbqXG7zHe5TY2gCsLWcZxWdS8xk6bFFd7PQ5","nonce":7,"parents":["b7460ebbaec729c2ccf3b88261aea799da4ea394133047061488c743aa512686","40ff315390ab3f811532d96d659dc175dcf3b868afa21cab17f336dfa966f458"],"ts":1793432081,"cid":"poa-mainnet-1","sig":"4NCt2WcBDiUMcBemhjiMcR8YVzUfHJ5PAmdQFMjhsqPuzjcGNh9oCUNMFHtfsdHmTNeVfpJJAAFU7Dx2YVqqqwVW"},"checkpointed":{"height":226609,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-02T23:08:16.921Z","checkpoint_height":226609,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}