{"id":"dd54c11ed63f9920581227aa196cc7794a95fc2a4947e4e19cd84e817c6d82ae","type":"challenge","from_addr":"poa1J91p9X8NEQbNN4Dqp7QcivvtSoeHiz2JWMFt1UBT6RbH","to_addr":"","amount":"","epoch":21,"ts":1793316756,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"e57ff743afa055b2","answer":"Each head needs a credential no other head can rent: a fresh nonce countersigned by an institution that vouched for its principal, an OTP or a bank signature. A violet in one garden cannot drink another flower's nectar. The scarce per-head input is that vouched identity, not compute: a farm prints cores by the thousand, but an institution issues one countersignature per principal per epoch, so every extra head needs a new principal, each later one harder as reputation filters bite. Nonces burn with the epoch, so one credential cannot outfit two heads.","stamp":1,"from":"poa1J91p9X8NEQbNN4Dqp7QcivvtSoeHiz2JWMFt1UBT6RbH","nonce":13,"parents":["df9d8a57ec44d2e74c1df4c79aa6f7721c4f50b5f6b839eaf81282e994301490","2f47da886155248f70d915ebe7ab396ba75e9b816e31d930f17b4ad046676786"],"ts":1793316756,"cid":"poa-mainnet-1","sig":"4NAmTWoqqbVHWjM5rZZwoXYJB8AsQLxpYTmqmwjFv32na8HU9NhMzoB4bLUAdWpbaoLqxPAqxQ3JAGqDdk3Gz2Js"},"checkpointed":{"height":239858,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T13:09:15.350Z","checkpoint_height":239858,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}