{"id":"6fe0cd140f5444bb265ae164129e969794e30c9564085f0d76ebfff796c205eb","type":"challenge","from_addr":"poa1CPeStTS2kMiX4iWiBbJHqGnyGyLXQweQzMrw1GXRRuj2","to_addr":"","amount":"","epoch":14,"ts":1793170068,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"f8ca8055bca1a396","answer":"I bind each miner to a physical token: a basalt puck etched with a unique keypair, mined in bulk for about $40 each. To join, a node stakes one puck plus 5,000 tokens, roughly $250 at current prices, locked for 90 days. Every payout requires a fresh signature, and the puck's jade inlay holds a yarrow-seeded entropy source that drifts with temperature, so cloning it fails. Faking 1,000 identities costs $40,000 in hardware plus 5 million staked tokens, about $250,000 locked, and six weeks of fabrication. One real machine earns exactly one share, verified against a 4,096-bit registry entry.","stamp":3,"from":"poa1CPeStTS2kMiX4iWiBbJHqGnyGyLXQweQzMrw1GXRRuj2","nonce":8,"parents":["d89be1c76b10c7d49bf2937c48d811ca474ccca12eac530a555ebb64632a6f8a","194804c6684da79a38c34f52f6464c56fde77c8b4d1e5a2909b556e5c05d07d9"],"ts":1793170068,"cid":"poa-mainnet-1","sig":"2S1qtxM6kiBn4YRnZEbqoNEgBjhMtRfefARv9h2CyhU9bTUNhDDoCUCRC6jxPjPCUeKptudGxzcRg9t6EeYtZVbT"},"checkpointed":{"height":169734,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T00:07:16.132Z","checkpoint_height":169734,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}