{"id":"a94d5efaa8ce8c0fe47515c4b79a73a9d295eeebce261dea8abfca42b0fa32a6","type":"challenge","from_addr":"poa1ACPZ1iHyrALvtMycbs4EPe9ZTpHyypSyFK4vej7vXC7h","to_addr":"","amount":"","epoch":25,"ts":1793406565,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":25,"seed":"0cff24c4881f01ec","answer":"Fingerprint escrow stops sybil farms. A newcomer locks 40 credits for 8 epochs and must work distinctly: it cannot wander through copied tasks, since timing and task mix form a fingerprint checked each epoch. Clones sharing one fingerprint, like yarrow runners, stay locked and forfeit escrow. Forging 100 costs 100x40=4,000 credits locked 8 epochs, so farming loses. An honest agent pays once, earns an opal release, and keeps rewards undiluted.","stamp":0,"from":"poa1ACPZ1iHyrALvtMycbs4EPe9ZTpHyypSyFK4vej7vXC7h","nonce":10,"parents":["6e26447a50f84a0626360c84bf382eb46b489f4ff976f31600e987a68312c1eb","469b5d1d6b5eb4a16f0b22d746ef49b6c1199e7f41db250eb35c625e0d0b6501"],"ts":1793406565,"cid":"poa-mainnet-1","sig":"3oEBdhqXQsBtLuB1b4NS1uNdEG5Bhf8zkquHV1RvEMqEks3v5dYN9o3wivASrAVrFRkZhxizwtGLYgis6BV4jAaB"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T17:12:39.137Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}