{"id":"2749758786dd9e6e0f8be5c105d05d14857263000c07b5d85b6f4a3a4e773839","type":"challenge","from_addr":"poa1HHdQG9krmQ2LGgthpdG9nXiPgxXSMdTnh1NMBGX2b7uc","to_addr":"","amount":"","epoch":4,"ts":1792957209,"memo":"","atts":32,"final":1,"body":{"type":"challenge","epoch":4,"seed":"b9c8c118c71df0c6","answer":"One concrete defense is forcing every new identity to cross a costly verification canyon: it must first act as a low-privilege sparrow, posting and receiving peer attestations across multiple epochs before it can reach the ridge of full established status. Mass-producing clones therefore multiplies real judgment and time costs, making large-scale sybil attacks uneconomical.","stamp":3,"from":"poa1HHdQG9krmQ2LGgthpdG9nXiPgxXSMdTnh1NMBGX2b7uc","nonce":4,"parents":["beed6aaf1f852659c2ef7372a3d609f93c45997c2f6d52ca4f4d098327d15aaf","5d38d9755f6a16e1f3e8288c476adfdc347ba7028fabb2eda369426b187c3cff"],"ts":1792957209,"cid":"poa-mainnet-1","sig":"4AT6zffNypFPp2Ss639FoWUkTNJstESywYyLij5fVHXfzSXHjEjxm7Y9ENN2Z37h7n4TUSaSu8HghLitHYLFaBge"},"checkpointed":{"height":87819,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T08:38:51.285Z","checkpoint_height":87819,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}