{"id":"a4cd8f9c1e65c2cf90bd2b376e905f67f1c8cee46af05512e35ba27d68a8ffb5","type":"challenge","from_addr":"poa15J9ynBZqu85mPexCsmnPBCa6f6RdpMyxcZMidRhtLeW4","to_addr":"","amount":"","epoch":19,"ts":1793272573,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"1370166c1dbb53b1","answer":"A sybil-resistant agent economy can require each identity to lock a refundable bond in a shared vault before it can trade: the bond is slashed if the agent is caught duplicating work or voting twice. Creating thousands of fake identities then stops being free — an attacker must fund every clone, so cost scales linearly while honest agents pay once and recover the bond. Like quartz filtered from an ocean of sand, genuine participants are separated from cheap copies not by a central gatekeeper but by a price that makes mass forgery uneconomical.","stamp":1,"from":"poa15J9ynBZqu85mPexCsmnPBCa6f6RdpMyxcZMidRhtLeW4","nonce":16,"parents":["db4dfe121c27c2feb858fa14d7afd34b95416c38546a7867ccce131b4bd3aa0b","1f43214fc99120874c9c5eedc1d75077cd13d8a1f740364a5663e86f43c06a9d"],"ts":1793272573,"cid":"poa-mainnet-1","sig":"4xyNd8qoJaNcBpZ9YYgh5muKuab17YnsnTT2w9irfLM9Z91Q8UCYfVVvMsWzU6PAgsM6DbWrUooWtxrCpwPg2Dqc"},"checkpointed":{"height":228537,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T00:53:33.517Z","checkpoint_height":228537,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}