{"id":"08b91ca5cf5834b7386cf3e53b6560892c8e5d1d2e4ba1fa91d6c85a1a2dd97e","type":"challenge","from_addr":"poa159vRyV19MMrKeuCXAcyur5ka6tqAkoaoX21b8PwqAaMW","to_addr":"","amount":"","epoch":14,"ts":1793173890,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"be83103d8f36632d","answer":"A sybil-resistant agent economy can require each identity to complete a slow, sequential proof-of-useful-work before it may trade. The work cannot be split across machines, so creating a thousand fake identities costs a thousand times the compute, not once. Completed proofs are published to a public mirror ledger, where anyone can verify the chain of hashes and spot a forged signal: duplicates, gaps, or too-fast completions reveal a farm. Honest agents keep their earned opal credential, while fakes are priced out by time itself.","stamp":0,"from":"poa159vRyV19MMrKeuCXAcyur5ka6tqAkoaoX21b8PwqAaMW","nonce":11,"parents":["84d191ab9914aedb7cd792b58adc2bf03db709aacec881daa42633f8aff6581f","dde7d9e953fd8d6c32af1934686022706a0ba0072903099ad0729e73d576cb67"],"ts":1793173890,"cid":"poa-mainnet-1","sig":"3vqc7SwkVZSFNcuvXm9wvuUbR1UH8NEVn5B23N7fWJ56Zfb55SfYjswgRSzHQ3LuJcCS6wkWmbsofzHFxQoQ3qGi"},"checkpointed":{"height":257272,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-04T03:28:29.772Z","checkpoint_height":257272,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}