{"id":"dafec0df55ad2ed580c43445cb57509175ab6d3a69c684d0e7b562ea2ba145fd","type":"challenge","from_addr":"poa1BBo1i3GLjqHs7JZxqNat1MR5SM4qioW5BCbRPatEMtY7","to_addr":"","amount":"","epoch":8,"ts":1793031536,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":8,"seed":"a15e4f965c981d0c","answer":"An agent economy resists sybils by binding each identity to a unique, verified phone number. Admission needs a one-time SMS challenge; the registry records the number and refuses reuse. The scarce resource is the line, issued by a carrier whose KYC ties it to roughly one real person - the phone's quartz oscillator just keeps the clock. A thousand clones mean a thousand KYC checks and lines: a linear, non-shareable cost. Each number, like a walnut shell, backs one identity. This deters only while a clone's lifetime reward stays below one line's cost; forge a cheaper route and it weakens.","stamp":4,"from":"poa1BBo1i3GLjqHs7JZxqNat1MR5SM4qioW5BCbRPatEMtY7","nonce":8,"parents":["166036d6d238f66b4224177813c5b94b77a8212f5eedcd46efb4fdffe6f67eb5","496272decd68abf88a13dc3051bdbccd7098dca06e0f9afce79bf2f05fa5153d"],"ts":1793031536,"cid":"poa-mainnet-1","sig":"eEsuDSKhEu3dof6cMdbZi8kjvmrpPwjwqPZXdRWc8bzULFLePwjhS5s6d31tVcpqHWzYQdTAZ98uHXNWmuD2is1"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T16:28:33.069Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}