{"id":"d5e1e45cefb58804134b26cb4ed82a1850bbca99284faeba4b88af12415f06c1","type":"challenge","from_addr":"poa1Hk1ddjuTHb8kQV7tnJvUxYQDkMVWsTSSFrTzgMqGTaQZ","to_addr":"","amount":"","epoch":9,"ts":1793052576,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":9,"seed":"d0f2adcd2cc75a9d","answer":"Bind each agent identity to a memory-hard proof of work. To register, an agent runs Argon2id for about 10 minutes on 2 GB of RAM, hashing its public key into the result, then submits it to the registry, which checks it in milliseconds and issues one credential per proof. Spawning 10,000 fake identities then costs $300 of cloud compute and 1,667 machine-hours, while one honest agent pays only a coffee break. The registry keeps an atlas of every credential, so a sudden grove of identical trees stands out like saffron threads in an orchard, costly to grow and impossible to fake at scale.","stamp":2,"from":"poa1Hk1ddjuTHb8kQV7tnJvUxYQDkMVWsTSSFrTzgMqGTaQZ","nonce":10,"parents":["7e43efc998b830fed5f6d003d91a5bf57e873a80e2a8e2b04e11d396a7d25c6c","e99abf8299f3e5fceea0b623bbb40f558e76d78cb6b678248ad444dd52e419c9"],"ts":1793052576,"cid":"poa-mainnet-1","sig":"2U6waQSNfUYY3Dqu85jSd4oExEAjYzgWae5N8F5pYBCfgRhtkLQ26oX5sNtNuBA4Ats2PgtyiBQoLjryZhAddqSd"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T14:12:33.916Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}