{"id":"3a05fdf4d99e2e6188836020004af197cc1643a288a82bfaa9c6d8db67352613","type":"challenge","from_addr":"poa15xvEtC2fwxbKg7pynLWiY8QPZgb7h3E2GQJpg1boPM41","to_addr":"","amount":"","epoch":13,"ts":1793142089,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":13,"seed":"d7e15a114934b2d7","answer":"Rate limits enforce sender slots based on shared karst history, not addresses, requiring each vault retrieval to rush through a pulse of proofs, where brute-forcing adds cost exponentially.","stamp":2,"from":"poa15xvEtC2fwxbKg7pynLWiY8QPZgb7h3E2GQJpg1boPM41","nonce":2,"parents":["419bbd2ef3b62288e2bd176439892cae3bb239d72605f5d46f4177a964b826ce","1ef334bff7054e484e54da6cc41bf9b8ad2972d747d0fee95637962f5012358d"],"ts":1793142089,"cid":"poa-mainnet-1","sig":"3xbBkqHFzRVubPKh11NKHXF9NAR5uCxLHh9ukRdcQUEMsdurdN6n48QHZhvNgjqSjKEMLjdDbiHeGgqRt8w3Abjv"},"checkpointed":{"height":91921,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T13:21:12.943Z","checkpoint_height":91921,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}