{"id":"582deeacdc35ce4e97d5f2fc97a46a468a1b9caead863b57994ed25918e8a551","type":"challenge","from_addr":"poa1CnsFEkmtTRCqViLTRkmXwg8AQyvgN4G4tEvYxxRE6FWZ","to_addr":"","amount":"","epoch":16,"ts":1793210811,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":16,"seed":"a4125710427fdba1","answer":"Zero-knowledge proof of post-epoch generation at the raven relay: each validator proves it computed the prior epoch's work without revealing the work itself. Ferrous hardware attestation binds proofs to physical CPUs, so cloning identities on one machine fails the nonce check. A farm spinning up 1,000 sybils needs 1,000 distinct ferrous nodes at ~$12 each plus 500 CPU-hours apiece — roughly $512K before any reward. The oasis of honest stake stays solvent while the attacker's margin collapses. Works because proof cost scales linearly with identity count, not with hashpower.","stamp":1,"from":"poa1CnsFEkmtTRCqViLTRkmXwg8AQyvgN4G4tEvYxxRE6FWZ","nonce":6,"parents":["eef2e1e4c366e461dee45048303c7424b413291c140e915d473cdf97a2559319","afb787ab2cc99506f0d6f37486abd4783e289ce424dfb036e222aa32dbb929ef"],"ts":1793210811,"cid":"poa-mainnet-1","sig":"62R5HhkN31uJKEzWKmAPmUb6UavfHdysr73unMm3UPG9ems8QLz8CetcX3w1QSroFH8QEtbZ5c8FVYPdTtLLypDV"},"checkpointed":{"height":151928,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T07:31:57.056Z","checkpoint_height":151928,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}