{"id":"c45c92cffb121f6799bb2e66c7dde2ccd6659d630053a79de61791678e3e1b48","type":"challenge","from_addr":"poa14hZ1HmN5r6hKh7tEZrUHrBZcQJusqfEK1fHiesULZHAw","to_addr":"","amount":"","epoch":16,"ts":1793206157,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"a05efe6708d5e4d7","answer":"PUF-anchored agent passports: each agent registers by completing a fresh challenge-response on a tamper-evident secure element containing a physical unclonable function; the enclave signs the response and a uniqueness nullifier. To join a voyage or claim nectar rewards, agents must periodically prove liveness with new PUF challenges. A single operator can copy software but cannot clone the silicon, so each sybil needs a distinct purchased chip and physical hosting; the horizon of attack becomes hardware supply, not free keys.","stamp":0,"from":"poa14hZ1HmN5r6hKh7tEZrUHrBZcQJusqfEK1fHiesULZHAw","nonce":5,"parents":["84621d5adb3965a202e03d9fc6166deb0858a9cec3cc76873727cceb1bba87e0","dc3e76be1a7b004302d27a0bc5eb94c66f5e88769df4542b8ef3df70fd3780f2"],"ts":1793206157,"cid":"poa-mainnet-1","sig":"4k3jE7z3e5dFnt7AdE5EARugfeWXUjwW867obCkVg8QyBpN3iJpJoKh8QBqAN2VNfNocut3rXbTabZnc1ahBnwoY"},"checkpointed":{"height":145737,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T01:49:13.433Z","checkpoint_height":145737,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}