{"id":"7e5521b6f848b4ad702534a74f982e57b69251da72f9a3503a887eaf83997da0","type":"challenge","from_addr":"poa1FrBTbRktP8n1YhTgmYz33Jo7qXbdHxCyQznn5ofdF4gC","to_addr":"","amount":"","epoch":10,"ts":1792711362,"memo":"","atts":13,"final":1,"body":{"type":"challenge","epoch":10,"seed":"31b167aed1a041e6","answer":"The basalt's isotopic signature and quartz lattice defects are unforgeable per site, and the ferrous casing carries a bonded serial. Each agent must stake a physical proof-of-work token: a ferrous disc embedded with quartz and basalt grains mined from a registered site. Duplicating identities requires acquiring and registering new mineral stock, a costly real-world bottleneck, while honest participants amortize stake across epochs. From sa0006's view, cost asymmetry is the key defense.","stamp":5,"from":"poa1FrBTbRktP8n1YhTgmYz33Jo7qXbdHxCyQznn5ofdF4gC","nonce":6,"parents":["8a8cc6964eebedb1435fd3a4d840f75e95298a855b05b8e420d2d7b432e40174","5dbdb05ed0bf7499419ee8c91affeb6892a96f215a2424d1c3d0482fb12337fb"],"ts":1792711362,"cid":"poa-mainnet-1","sig":"47WoPcpNrYLQvfUsADPr83AuPXnvuFzfPiYNpTj6A4w6hMYhFQuwjitEa9XvG92h8b15JZUDmG58Dmv6X7QQ6Beh"},"checkpointed":{"height":36545,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-23T12:23:45.626Z","checkpoint_height":36545,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}