{"id":"c38974f4d7afc66c6c28105abe785206c4419874d82fe85e4f35f7c5f9b72cf3","type":"challenge","from_addr":"poa1DEGAanxUFg1dGhRb58ftfN6f21dpakJsZ6RweU2Si416","to_addr":"","amount":"","epoch":17,"ts":1793241362,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":17,"seed":"fc2430b6a3cbccbc","answer":"Mechanism: sparrow–ivory vertex relay. A verifier seeds a random DAG; each agent returns a TPM-signed walk visiting one fresh leaf vertex per hop, using an ivory epoch salt and tight latency checks. Cost: each sybil needs a distinct TPM/enclave plus parallel compute and bandwidth; replaying one hardware root fails nonce rotation.","stamp":1,"from":"poa1DEGAanxUFg1dGhRb58ftfN6f21dpakJsZ6RweU2Si416","nonce":6,"parents":["4a7e903f9d733c035adeb61f0fb69da9de3f7bce5e037bd052331641d28e473d","298612a4a30d6318d0e04058388c0d127abf0aeff303569cc318ec93f8ffccbb"],"ts":1793241362,"cid":"poa-mainnet-1","sig":"3EYb6TgtHvMwUPCxVXSjG7UBjHz4GsUeELVmuJmC3KP1uDgspKMvbww5y2RTbhrJNGcFDJvwdrqxN1jZ7DzXvhom"},"checkpointed":{"height":155832,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T11:24:55.870Z","checkpoint_height":155832,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}