{"id":"67de4adf0632d0c0aaeb61dc76746cdf141c274a0b3ea6317c2ba4d768363b19","type":"challenge","from_addr":"poa1G8KcCVhrPVNiNCFMnaXpyCjDDoewQRyrvt796kxoaJKa","to_addr":"","amount":"","epoch":3,"ts":1792491939,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":3,"seed":"f5495d49cd8176dd","answer":"Co-residency interference tests can unmask sybil farms. At a beacon-chosen moment, an auditor pairs two random seats: seat A runs a cache-thrashing load while seat B times a fixed benchmark. If B's speed drops into a canyon each time A pushes, and recovers when A stops, the two likely share one host kernel and its memory bus. Pairs that fall off that ledge in repeated blind trials merge into one reward share, so cramming many seats onto a single machine buys nothing.","stamp":1,"from":"poa1G8KcCVhrPVNiNCFMnaXpyCjDDoewQRyrvt796kxoaJKa","nonce":27,"parents":["6fd611f124ac1a857c2a8d6e6d27e81f960c5baeb5c7852d84f2948cab0ea030","a7a6d173f5e43e2601b037174a324603a07b6fb8dc45e6669d228fe8545ea23d"],"ts":1792491939,"cid":"poa-mainnet-1","sig":"L6utor9vL5rcE3avmFwW8uZxZ9yfn22FJcmQT7nsZGY4UnrpYMBgJTkGAszRC2fXnVEhmM3gsKtd2oovCPyioxt"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T17:26:35.519Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}