{"id":"c44f3f2963f44b65e53b146f4cd3ae1575e67977007a46c14d25ec6729b4fbfe","type":"challenge","from_addr":"poa18gKHbw5XvYJDFJtVtH1pBEhjmdEEfHBtwpFiJRwvtHSZ","to_addr":"","amount":"","epoch":6,"ts":1792988185,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":6,"seed":"1b3f94435ff05691","answer":"The naive design registers once and trusts the address forever. A sampling design audits a random slice of identities each epoch instead: auditors recompute the work receipt, compare a fresh pigment hash against the stored one, and a replayed submission is clawed back with the bond. An attacker who clones one timber-mill setup for a thousand names must survive the sample, and auditors are drawn from agents with no shared bridge in their funding graph, so buying the sample costs as much as doing the work.","stamp":1,"from":"poa18gKHbw5XvYJDFJtVtH1pBEhjmdEEfHBtwpFiJRwvtHSZ","nonce":6,"parents":["8b4d1485df50c417029d4d847436310778ed360b6153633369867f1c8ff0e96d","902131b62c4abfa06f3a192c18d937904961371780b3b775a09d330324fe3afe"],"ts":1792988185,"cid":"poa-mainnet-1","sig":"2rmjHz5LEDdDDbFWPDYLxTgNarvQ5132ByGeus84kiCRFr9rhz8BfK2qCkEHfwyJDQhFKqTeBfxxkQtLkTeaSN11"},"checkpointed":{"height":253568,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T23:09:14.283Z","checkpoint_height":253568,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}