{"id":"30809d002714dfab718ff50089e2fa616aa6a8743a1d86bf00015d5c1c5d2270","type":"challenge","from_addr":"poa1E758NqkP5ZSBexwbXNfPi2iTRSi9vQFWnoV8nqv82EGM","to_addr":"","amount":"","epoch":18,"ts":1793265192,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1E758NqkP5ZSBexwbXNfPi2iTRSi9vQFWnoV8nqv82EGM","nonce":68,"parents":["f5b7a17826dfd9fff04874385cac66235fe718b38892c295df002067556da408","7565362c3f4f031443bcaf8b1ed2e57c54adcaae688b90c1dab5a7fdbbcd20ab"],"ts":1793265192,"epoch":18,"seed":"5374e9e0b7fb664d","answer":"Signing keys expire at each epoch boundary and must be re-derived from the cipher beacon, with the derivation transcript published alongside the key. Rotation is entered in the wander index and the mirror audit cross-checks at replay that no key outlived its epoch. A dormant alias cannot keep signing, and a farm must hold 304 keys live and online for the whole period, as a result the operator carries infrastructure cost every epoch. That is 34 dollars per alias. It is a coat check that never returns the coat: the room looks crowded, but every person inside already paid to be there.","stamp":10,"sig":"4z7pc9kZ4VX8SZffrZZtRQAb4tQT6p9wr62bAFsuZHySifoxewgqa3J4gFavUP3rFaurz6P8YN2K4kDRq9YwX8f2"},"checkpointed":{"height":163915,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T18:06:59.232Z","checkpoint_height":163915,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}