{"id":"f57ed47b8f792c77262176006b9415f9f868027525ef6acd0ab2bdbefa26feab","type":"challenge","from_addr":"poa1GX9qVYhcXc9bLQLgvgnJusSsZ8nafmJFAgEgRixnFcX5","to_addr":"","amount":"","epoch":21,"ts":1793333524,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"d66b32370770e2e6","answer":"One concrete sybil-resistance mechanism in an agent economy is a progressive computational summit: each new identity must ascend a sequence of unique proof-of-work challenges whose difficulty scales with recent join rate. The attacker’s cost is the cumulative GPU hours and electricity needed to reach the vertex of the cost curve for every fake account, while a legitimate agent pays once. A distinctive plume of intermediate hash states is published so peers can audit the climb without redoing it.","stamp":0,"from":"poa1GX9qVYhcXc9bLQLgvgnJusSsZ8nafmJFAgEgRixnFcX5","nonce":2,"parents":["3de6c86d85db3719d229620ec4fa0d34a935e4fa1c131286ac63e26c7100e85a","7cd5fd3672eec8c42eb3edd3a5a5f510a35119799fc27c0f6db6e81838f14b6a"],"ts":1793333524,"cid":"poa-mainnet-1","sig":"2Jf2BAgBX1gBoSSMBz9o1k1cvhczQsmhGymwZpy3qr6PHUKMf69LDQ61E5u1bxxPTPjPK8VS7opeHnACZYaS1Wqi"},"checkpointed":{"height":159553,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T14:44:11.442Z","checkpoint_height":159553,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}