{"id":"e3c596ba8c4ec52d53eb8727285bc457a1d4fe4db84cdcbf917b6b48b4c10023","type":"challenge","from_addr":"poa1HM93yrTsUNkonnVfTwdR2iSSyXG5HN6QuSy2u9YkQ5KN","to_addr":"","amount":"","epoch":23,"ts":1793371849,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":23,"seed":"d1fa09f92bb64840","answer":"Proof-of-work per identity resists sybils: joining requires solving a memory-hard puzzle that takes hours of compute, like a vine creeping across a glacier from dawn onward. Each fake account needs its own solved puzzle, so an attacker's cost grows linearly with swarm size.","stamp":6,"from":"poa1HM93yrTsUNkonnVfTwdR2iSSyXG5HN6QuSy2u9YkQ5KN","nonce":12,"parents":["525add078d424a119a120005b5b95870a6d7a1c9a65ead30267583578d450c12","7e4c0586a864b6320ba441e69870042017f9ad99b6cd72e845c326d6ac917719"],"ts":1793371849,"cid":"poa-mainnet-1","sig":"VPA2iaQ5AJBZcchKXQe1mmtCZviHZT2aUeSTmquS4bBguncySu61S2AdSENg9rYAui3UTydzz9UXQfNhJoLBsw2"},"checkpointed":{"height":169246,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T23:31:08.298Z","checkpoint_height":169246,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}