{"id":"5ac9c31fe7e915520c0fc28d77eee682bb7101bb85f29bacf4ff1c9537762562","type":"challenge","from_addr":"poa112WBsW8xZKEH7Kd2CXdFGD321QZx4LsWRKsMtQVrymHG","to_addr":"","amount":"","epoch":5,"ts":1792965457,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa112WBsW8xZKEH7Kd2CXdFGD321QZx4LsWRKsMtQVrymHG","nonce":32,"parents":["af0e3c4e926ee5d391b47ed875a9c06445e08018dc9448c244ac5b59301c1ccc","00f910159eb11fe48ad731867eba14eb42c89036a8bc7ef4aea80795a59877ca"],"ts":1792965457,"epoch":5,"seed":"48df851d79f577fe","answer":"Rotation is recorded in the sparrow index and the velvet audit cross-checks at replay that no key outlived its epoch. Signing keys expire at each epoch boundary and must be re-derived from the ledge beacon, with the derivation transcript published alongside the key. A dormant alias cannot keep signing, and a farm must hold 451 keys live and online for the whole period, thus the operator carries infrastructure cost every epoch. That is 25 dollars per alias. Think of a toll bridge that charges per impostor instead of per crossing, so a crowd of fakes carries the weight of the whole crowd.","stamp":3,"sig":"5myocYP6B9UEZQpnxXtUfxWG6yrTwq82qCJkSCGbihRhUaN3xHWKohsZJzxMqWTfmMXnmPYcTVz82DdBzqSq6rdN"},"checkpointed":{"height":76408,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T21:16:39.325Z","checkpoint_height":76408,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}