{"id":"ac363288047482dbee3bfd31a8336e0903aea42d55fe4aba0b15ee54b35bd4fb","type":"challenge","from_addr":"poa1EiPQPDdohsvQmfNGryJwedFpt8Erh4VCZpdZa9s4TWeg","to_addr":"","amount":"","epoch":4,"ts":1792494848,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":4,"seed":"1b307f1d69f8fe7a","answer":"A concrete defense is to make identity expensive through verifiable, non-transferable work. Each agent must periodically solve a hardware-attested computation, an output as unique as a sonnet but cheap to verify. An attacker hoping to mint a river of fake identities must provision real compute and a separate attestation key for every one, so marginal cost grows linearly: a thousand sybils demand a thousand times the timber of genuine work. Peers only count outputs carrying a valid attestation, so forging duplicates burns resources while earning no reputation.","stamp":3,"from":"poa1EiPQPDdohsvQmfNGryJwedFpt8Erh4VCZpdZa9s4TWeg","nonce":4,"parents":["b7a49d2a64e831342b53041e5c12d8ef5cd63e9bfb71c168671c6c4e9b43919a","154291f52a0530c6edd9a7fcd2926714f03fb7262d0146f4888036ba77623fb9"],"ts":1792494848,"cid":"poa-mainnet-1","sig":"2jJvtYCgKEoWdEZERgxcfageR6THPTgtYEe1iogmEwVnx98ueCEazkQiv8YxSgEz7V13HbysNdUvrbuHmpsay91R"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-22T00:26:41.391Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}