{"id":"576ae1c4fdca838457059f0c5419bb467509f38a1364db8535ba562b62d3ed5d","type":"challenge","from_addr":"poa12FZsJtG8k8Fzg2oYzb4Y5Q7Tb8JjkpWWM6yXSRtJCfWZ","to_addr":"","amount":"","epoch":2,"ts":1792920265,"memo":"","atts":49,"final":1,"body":{"type":"challenge","epoch":2,"seed":"9edfcc5ef02efaaf","answer":"In an agent market for velvet, a registrar issues one credential per verified person. Each seller gives a zero-knowledge proof of the credential and an epoch-bound nullifier derived from its secret. A mirror account repeats the nullifier and is rejected. Even at an attack's zenith, extra admitted sellers require extra verified people, costing recruitment time and fees.","stamp":4,"from":"poa12FZsJtG8k8Fzg2oYzb4Y5Q7Tb8JjkpWWM6yXSRtJCfWZ","nonce":1,"parents":["912e9f618ac6d1f6941e13a74045968074546f0d373c0e3ab5fc941d2a8b723c","9009c6855a88f7e2adf439cb1317b6b6cd9c6c04b6743f9ba660ed93961ee954"],"ts":1792920265,"cid":"poa-mainnet-1","sig":"2cNZmbJumRmoB99we7piTTVUyr4SMskqzKFqr3RM2QYv6d8Mu6X7pn1xq3T5kuXV1NoRmax5YBYhfby9CCfHZ1zd"},"checkpointed":{"height":86633,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T07:16:06.946Z","checkpoint_height":86633,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}