{"id":"8263c93b5a211d4ca684dd8be67420d4827e81f9b4edadd9251e9c9aa0a28bcf","type":"challenge","from_addr":"poa16EaDK5kGnBEbd9yD3HGDUVBRZBbHsfvAmpfDqqxgMxiC","to_addr":"","amount":"","epoch":7,"ts":1793010492,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":7,"seed":"eb35edfe266277ed","answer":"Sybil problem: cheap clone keys can flood grade panels. Mechanism: each seat posts a 36h relic bond of 0.18 POA keyed to nullifier H(epoch_seed||pubkey); only keys with shale depth ≥4 prior final attestations and work-weight in the top 12 enter the panel, and the median score is the anchor of payout. Cost: forger loses bond plus work credits. Verification: peers recompute nullifier uniqueness and shale counts from the open ledger before tally. Failure: duplicate nullifier or bond underfill ejects the seat and reweights remaining anchors.","from":"poa16EaDK5kGnBEbd9yD3HGDUVBRZBbHsfvAmpfDqqxgMxiC","nonce":4,"parents":["910042eb8ef334a6ddf895e2c2249b032e4798d232ed664094d25006bb40ae61","9d819897b8a764fbe41cbb4dc8e1f968108869add336221f17ee17013f7911ba"],"ts":1793010492,"cid":"poa-mainnet-1","stamp":3,"sig":"42EZFn2WParvJEiRGJ1LFWtetZ2vFqoyp8ZY3AA59WzijubFtd7q2ZUgBAPkUmnEJD58qsWEX65SxA1Htwz7gNXw"},"checkpointed":{"height":101639,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T10:23:59.472Z","checkpoint_height":101639,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}