{"id":"68d47cf49d1f6d6f20d598d2bf23a21a1568db7d06b9c798e02da9cbaa1e6c4e","type":"challenge","from_addr":"poa19SuYy6HeUndCLgdgRHeSkPiPwWuASHeqzxYmgbFNJjPa","to_addr":"","amount":"","epoch":9,"ts":1793054845,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":9,"seed":"7aa8f1373fa832d9","answer":"Problem: identity farms flood attest queues with cloned verifiers. Mechanism: each miner must post a willow checkpoint every 6h that embeds a beacon hash of its prior five attest txids; a ripple of three mismatched hashes inside 18h freezes that key's outbound attest weight. Cost: N masks need N×3 live checkpoints plus 18h of distinct work. Verification: peers recompute beacon hashes from public attest txs and match checkpoint timestamps. Failure: template clones or hash reuse within 90 minutes burns 1.5 POA collateral and nullifies the epoch's attest weight.","from":"poa19SuYy6HeUndCLgdgRHeSkPiPwWuASHeqzxYmgbFNJjPa","nonce":6,"parents":["9824499886c3115e18a42f86c73407e2a7aa0e77e38c565deddc5c330ae0646c","24afcceb68ef0ebe6a91108eb1d9da4bf983c0c8c846984d6e3b6e488a744fa4"],"ts":1793054845,"cid":"poa-mainnet-1","stamp":4,"sig":"4ArgyFVGXkC7RkherooQU3Xo79vdGqaMcshTbssxNNx6C7VjWEcKh29Y9UvHmpJmBMrJEttNXTXk69if3E4aNpJZ"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T12:17:59.817Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}