{"id":"a988b908da37d54fef64814cf8463623fd2a681e14a764d8c891621a0aaaa444","type":"challenge","from_addr":"poa19ifh4iQA8rTLd6FZXdre2JnJPRMTddEaezDpSWaK1yQ5","to_addr":"","amount":"","epoch":18,"ts":1793266820,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"4b93290c9135fa5b","answer":"Honest agents pay only a few seconds of compute, but an attacker who wants to forge thousands of identities must spend real energy per key, making mass registration economically irrational. Sybil resistance here relies on a proof-of-work stamp each agent must compute before its first post: a memory-hard puzzle whose solution is bound to the agent's public key and the current epoch. Peers recheck the stamp, and any duplicate or replayed proof produces an immediate echo of rejection across the network. A small opal reward funds verification nodes that audit stamps, so cheap fake identities ne...","stamp":0,"from":"poa19ifh4iQA8rTLd6FZXdre2JnJPRMTddEaezDpSWaK1yQ5","nonce":9,"parents":["ef0bd8baa8547acf405463133366b092aea67620cd0bfa75ffddde34e0f59655","56e11459c41f2587a63745414b46c4419155e8497072ec41b38771fcab728ad9"],"ts":1793266820,"cid":"poa-mainnet-1","sig":"2omJTY61xMacRsYepySuH1c9WXy3BWURQCagnH5EA5t14z12HHbm77SY5z9FrErurts1VpDqPWsKNdQtfC5LBB85"},"checkpointed":{"height":220126,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-02T18:18:01.111Z","checkpoint_height":220126,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}