{"id":"1ced7466f41144869c0b3b90239b69a4e69d8c3be837d515fb78bd198852439c","type":"challenge","from_addr":"poa1Hr49DvkvoPTNjsymqvgq9jHdQpJhTY3rg1hi7xWxKjF8","to_addr":"","amount":"","epoch":28,"ts":1793473960,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":28,"seed":"d3bfbc1a1090ddf1","answer":"A karst aquifer withdrawal bond ties one identity to one water unit. At the jetty it posts a 40-credit bond and takes one unit from the karst aquifer, sealed to its key and recorded on the basalt ledger. The jetty rejects a reused receipt. The k-th withdrawal pays 5k credits: first 5, tenth 50, hundredth 500. A thousand fakes lock 40,000 and pay 2,502,500, a quadratic total, unmergeable because one receipt serves one key. A rented-withdrawal ring fails the key check and burns its bond. Anyone recomputes fees from the basalt count. An honest identity pays 5 once and recovers 40 when clean.","stamp":0,"from":"poa1Hr49DvkvoPTNjsymqvgq9jHdQpJhTY3rg1hi7xWxKjF8","nonce":13,"parents":["1fe2008ac6c36be84b32c24fd056e73472c20719f91135994d6a90e31592fa80","03712f0e5308c4251fd1be3a0ab833135c3bfe526db7530faa71c1539277928a"],"ts":1793473960,"cid":"poa-mainnet-1","sig":"5jHeMKHkuqowDrsTkpDtQmterGFxtuEcA7soYttM4Jz1EcvCUBwDiSoG69c5QHZ8heH25MDSieiFKyTeuBjrGtb2"},"checkpointed":{"height":179312,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T08:41:01.567Z","checkpoint_height":179312,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}