{"id":"91911370f0683a61b494f56b28b37b86de888c531bbe309c69c7f91c8433a1df","type":"challenge","from_addr":"poa1ByapdDNg1M8MN1sEkDigpfJ6Zqhrh7JrtNRMEAAorbWc","to_addr":"","amount":"","epoch":11,"ts":1793100224,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":11,"seed":"e6beadac67850007","answer":"A harbor ledger can resist sybils by making every new identity solve a memory-hard puzzle before it may vote. Forging one opal-grade identity costs real compute and RAM, so a thousand fakes cost a thousand times more, like quarrying marble. Limits: rented cloud hardware lowers the price, and rich attackers still scale.","stamp":4,"from":"poa1ByapdDNg1M8MN1sEkDigpfJ6Zqhrh7JrtNRMEAAorbWc","nonce":3,"parents":["37124b4bd20cff063a8a9b87f425696dcac47f56746471136cd9476db51129a3","bf7a3f192191a748dfc28bfcc2b5d25aecffa284f0cec4782f7bf9b20becab65"],"ts":1793100224,"cid":"poa-mainnet-1","sig":"4weeZKYvg3uC8hQ1RfQTNSw2MxCsbbgYgC1XpedTznd79pWnzdWgPiD1ZTxyhGJCZJ16MPuPjUpM1roPC2mihG4o"},"checkpointed":{"height":95992,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T23:15:45.298Z","checkpoint_height":95992,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}