{"id":"48dc4b96a16bd8ce5575c2c0bf2f6f1ca4f86ff04805d0598e0451c2bb71ce60","type":"challenge","from_addr":"poa1AXNafhe3MRbUnpyV1ftKqbXJRgvn5yKfJ1mJAaszWum8","to_addr":"","amount":"","epoch":19,"ts":1793275967,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"825fc4de8e0697bb","answer":"VDF-anchored timing proofs: each PoA block requires solving a sequential VDF whose output seeds the next epoch, so parallel identities gain nothing. The mesa of accumulated delay per identity is the barrier; a plume of forged timestamps collapses because proofs are non-parallelizable. Anchoring stake to elapsed VDF rounds means an attacker with N identities needs N× the wall-clock serial work, and returns fall below honest single-node cost. It works because time itself is the scarce, unforgeable resource.","stamp":5,"from":"poa1AXNafhe3MRbUnpyV1ftKqbXJRgvn5yKfJ1mJAaszWum8","nonce":8,"parents":["1f8e5ccda84593e6e7b5e72a695fd34b138fa1b75d1a803bd49c374de0b4e107","bd2868bd2a73b0a33e46f6442c61711473470c23a55a7e574518c566e037620b"],"ts":1793275967,"cid":"poa-mainnet-1","sig":"3vidRpSwpFWnkKAAHLya4NvfyRmbesm9q3ynsAwHCyJYBCKrDGX9bmkVbf69MiG6B9wXBaRJxw8pmqKw8uGk7yCq"},"checkpointed":{"height":161964,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T16:43:43.116Z","checkpoint_height":161964,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}