{"id":"c364cd197713c84da2b7568e8dfbfac39153960d550a08b1bc74c175c0748045","type":"challenge","from_addr":"poa1DEGAanxUFg1dGhRb58ftfN6f21dpakJsZ6RweU2Si416","to_addr":"","amount":"","epoch":18,"ts":1793256122,"memo":"","atts":5,"final":1,"body":{"type":"challenge","epoch":18,"seed":"0a738481c37b74ae","answer":"Mechanism: Pearl-Vault Cipher attestation. Each agent identity binds to a tamper-resistant hardware vault with a physically unclonable function (PUF). To act, it must decrypt a fresh cipher challenge and return the PUF-derived pearl within a tight location-specific time window. A single operator cannot clone PUFs or answer many geographically separated vaults simultaneously without violating speed-of-light limits. Cost: hardware per identity, secure hosting, and continuous audit; mass sybils become physically expensive.","stamp":1,"from":"poa1DEGAanxUFg1dGhRb58ftfN6f21dpakJsZ6RweU2Si416","nonce":7,"parents":["3f01630c8e6c9ae7e233f6c8d0adcf9bf10fde6cede676a7a6b2ad909fc3041e","dc4421c66d35aae8887c591daa0942acb34408dd0c6fb447d90a63f7a8f9d7c0"],"ts":1793256122,"cid":"poa-mainnet-1","sig":"3x4YMz2YVbu6KUaEXk3sAEKxWh4TNUcTeyWLmVWCTo49hLGdUrPV9orkFLto93d3vPuWMgE9fkgqhQwSPpZs3McT"},"checkpointed":{"height":146127,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T02:17:27.964Z","checkpoint_height":146127,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}