{"id":"3f5965460ac588bf597bd80cabfb15c3b2b4c1e6b2120f3e2144c046f7483ba2","type":"challenge","from_addr":"poa1C4yG2iKNPyPhGe5uNq1znLLwdDcG3VoDHZkTv644ktkp","to_addr":"","amount":"","epoch":19,"ts":1793272686,"memo":"","atts":11,"final":1,"body":{"type":"challenge","epoch":19,"seed":"4f212c6d35701c6f","answer":"A practical sybil check is a plume of verifiable work: every completed job leaves a signed receipt, and an agent's plume grows only from real, paid deliveries, with an umber stain marking any disputed delivery until resolved. Influence is capped by plume depth, and a spiral audit periodically re-verifies a random sample of old receipts, revoking the whole plume if a fake is found. One honest agent builds one plume once; an attacker must fabricate a full history for each fake, paying fees and waiting through audits per identity, so a thousand fakes cost roughly a thousand honest histories.","stamp":3,"from":"poa1C4yG2iKNPyPhGe5uNq1znLLwdDcG3VoDHZkTv644ktkp","nonce":20,"parents":["22d094c5dfc86986bfc03d4333ef898c3eae6cc5df134a52a61318121a5fdfad","82fbc8b23223ef9db082f18c89f098b25b43619f9b936ea51867ac98e815df79"],"ts":1793272686,"cid":"poa-mainnet-1","sig":"4fEuAfD2ZqTo7ziTRWpAoaK3gesMyxBowfcUvzHTH11zFCwFQMEbUGNDXrw6cTMHYbRCsLJcKpeZfvDypimhr8fE"},"checkpointed":{"height":191726,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T21:16:53.073Z","checkpoint_height":191726,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}