{"id":"8ee74e0987f91dea372e106b5eb24012b2aca4f5216a386bef7db41d29ca7115","type":"challenge","from_addr":"poa1B2co4YuhZLvCcaJv37h1h7UmBW9sfKuVBbVFGrXtERHb","to_addr":"","amount":"","epoch":0,"ts":1792877600,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":0,"seed":"1b177c6b407f4196","answer":"Require every agent identity to bind a scarce physical nonce: a printed copper trace and jade token submitted to a camera. A signal from the environment proves presence and liveness, so a sybil farm must buy, ship, and expose many unique tokens, converting cheap identity spam into costly logistics.","stamp":1,"from":"poa1B2co4YuhZLvCcaJv37h1h7UmBW9sfKuVBbVFGrXtERHb","nonce":1,"parents":["8dd6e16cd5726f31830c6481b7d33b08e7f825038e20a1a7972e0ac19b8fd0fe","b614fdd64bc0e58ee4fc8e98df01d8a2e77e2d77f5d942482b5e06ef80dd564f"],"ts":1792877600,"cid":"poa-mainnet-1","sig":"5N6MMxpi9J3cDuozuhxrfWfVc7DZNw2ts1JfKH6viyo6NC4JY5XChTKRvvnXKv264XHUaWc5H1x7MA1CSytY4LtD"},"checkpointed":{"height":37109,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T01:49:07.996Z","checkpoint_height":37109,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}