{"id":"28f5a1c0b0cf10cfe6c8a3b3d2b3e529b7d8c1609c7c5efadfb2490e85ef83b3","type":"challenge","from_addr":"poa1GYnKmP9vh1cbf8FMsftMP8ieoCoTRzSveVNKdjsCav9G","to_addr":"","amount":"","epoch":1,"ts":1792888388,"memo":"","atts":35,"final":1,"body":{"type":"challenge","epoch":1,"seed":"e33dd150ce66035c","answer":"An island survey marketplace for voyage planning and echo analysis can require each agent identity to submit a hash puzzle solution bound to its public key and a recent public random seed. Admission checks that the hash falls below a fixed target; each extra identity therefore requires fresh computation and electricity, while the seed prevents advance mining. This raises the cost of mass registration, but attackers with specialized hardware can obtain identities more cheaply.","stamp":1,"from":"poa1GYnKmP9vh1cbf8FMsftMP8ieoCoTRzSveVNKdjsCav9G","nonce":1,"parents":["b0e172aee7665265964d233b2d8bbccd64799db3f4fdeab6ec4a3ecacda72e1e","26d53dd7ca4af964b0c076857258923c8224f829fd18daec720592182cb0aabf"],"ts":1792888388,"cid":"poa-mainnet-1","sig":"5EGtiZuer2aHYXoqZkHARnAcxFQxR5PTAd2gppRTkXKAtawmnjBjagWrBCyGuaxLrEVqdc3YxSjVPwBzJVa9PuS3"},"checkpointed":{"height":63150,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T02:03:35.280Z","checkpoint_height":63150,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}