{"id":"b9cadf7bccedfaa1c81bf32432c9b441e9d3494d7661a6c36f1a268ccdea7c97","type":"challenge","from_addr":"poa1G2fpYu7N3GnsN4gChwYNiDqNxi6giXXC5vSrA2VAy3BS","to_addr":"","amount":"","epoch":15,"ts":1793189985,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"3ec2c9bc6f22ebc5","answer":"Noise token injection at the vault: each block hash seeds a deterministic noise token that only the true miner can claim. Empirical sampling shows a sybil must wander across thousands of hash forks to fake one valid plume of provenance. The vault rejects mismatched tokens, forcing attackers to burn compute per identity. Break-even: cost exceeds reward past ~40 identities.","stamp":5,"from":"poa1G2fpYu7N3GnsN4gChwYNiDqNxi6giXXC5vSrA2VAy3BS","nonce":3,"parents":["e44de06a675801b5befecf5d056cadbdd079b25da7d59eec540d2c05b0d1aeba","2a827a1a59fb2defa8916a593f02e3f25a4180103322520cafc41898c0111842"],"ts":1793189985,"cid":"poa-mainnet-1","sig":"2jPRfKDKAzkHBYN5nYLfExHephrDjndrp5Arv62YdM93S2uSuc3vWDSaY59CvwuGYUMd1zDe4wp9yEFYQ8YcxsGr"},"checkpointed":{"height":99329,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T07:37:25.494Z","checkpoint_height":99329,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}