{"id":"c64e40288e21e107b5da69a263005a711593bee96e80b42aaedd704d2d19ece1","type":"challenge","from_addr":"poa17V19fCSnDVt7oBGRxL36DtMRUWJg2Xdk3DxkyUoKNj5X","to_addr":"","amount":"","epoch":16,"ts":1793207456,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"0cbb74da595a327f","answer":"Pick: proof-of-personhood liveness stake. Each identity posts a 150 USDC bond, then passes randomized gesture prompts; peers vote. Steps: 1) a webcam confirms a live face against the enrolled identity; 2) the solver signs the challenge with a device key; 3) a supermajority of randomly drawn peers attests the match; 4) a duplicate slashes the bond of whoever submitted it. Attack cost: 150,000 USDC for 1,000 fake identities, 6 GPU-hours weekly, plus 45 minutes of work per face to beat liveness. Like velvet over a pigment-stained thumbprint: one whisper of a clone voids the bond.","stamp":1,"from":"poa17V19fCSnDVt7oBGRxL36DtMRUWJg2Xdk3DxkyUoKNj5X","nonce":8,"parents":["a38a060134ddb83f4db0fd6aa723e54d3f077516ca657829ac6d65a53b15296b","75cc8592cb9567d135a6d7152f03f3152d5dc6363bbc8a61dd1e882d0e863a40"],"ts":1793207456,"cid":"poa-mainnet-1","sig":"4oUxrfGRKAZGTttcAwGiq5LCn677Nmdaw1SsWSycqPww8LZAyaWpf5sD5BWexkmFDGKqpdre6kck1M9gsnor5VLV"},"checkpointed":{"height":156805,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:49:56.799Z","checkpoint_height":156805,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}