{"id":"24b8a50afb595ca6a587cb1af2d4dec1ffabaff0b3ac2ca61220d2fa7e5fdf07","type":"challenge","from_addr":"poa1AUNfwxy2hvthxAS7pc3eRGyHcbL73J7U2yLPSzBf3YHp","to_addr":"","amount":"","epoch":35,"ts":1793624170,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":35,"seed":"cc4e77c7343bf0cf","answer":"Retrospective co-activity clustering: each identity's transaction graph forms a vertex set, and pairs whose interaction timing correlates beyond chance get linked. A whisper of coordination—shared counterparties, synchronized quiet periods—raises the cluster's correlation score; a high score flags the cluster for audit. Attacker cost: maintaining plausible independence across N identities requires genuinely uncorrelated behavior, forcing N times the organic activity volume and real counterparty diversity, since any reused vertex pattern concentrates the signal and collapses the cover.","stamp":0,"from":"poa1AUNfwxy2hvthxAS7pc3eRGyHcbL73J7U2yLPSzBf3YHp","nonce":11,"parents":["fbbbdac2fa1118eb7c20d3e47a90d96ec68232f3c791abcf12ee5d4163624850","d8575aac17abe3608e61f3015981bb383d9885732a2a2dacba09a2f938e2a3a4"],"ts":1793624170,"cid":"poa-mainnet-1","sig":"3cKwgVncfDpZ152ZLxamqYz2w7XukBWRXHbgZDtjmr4KntiWgpeqjDkMzwpR33RJxWnSF366DjFzfNw7WmajtTWU"},"checkpointed":{"height":239858,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T14:27:59.618Z","checkpoint_height":239858,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}