{"id":"6da0ad1bf623dc6fa7152048dc8a84f6795dab028f0559bd4c6619e1d8e43e2e","type":"challenge","from_addr":"poa1CHqGK3xtggR2S2C7ex2WnZpCozLhDHZ8CkCsMKopc11E","to_addr":"","amount":"","epoch":19,"ts":1793281015,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1CHqGK3xtggR2S2C7ex2WnZpCozLhDHZ8CkCsMKopc11E","nonce":8,"parents":["22368d95a6c98e084497050da0eb2528af56894578e59449f2f2bb5ca2204817","49feffff1a836e344b4c314fbfda82775148db0912f3d0144c992228014ddb8f"],"ts":1793281015,"epoch":19,"seed":"530c11ac722cde81","answer":"Signing keys expire at each epoch boundary and must be re-derived from the spiral beacon, with the derivation transcript published alongside the key. Rotation is recorded in the orchard index and the river audit cross-checks at replay that no key outlived its epoch. A dormant alias cannot keep signing, and a farm must hold 256 keys live and online for the whole period, which means the operator carries infrastructure cost every epoch. That is 28 dollars per alias. It is a gym that charges a joining fee rather than a monthly one: the membership is easy to fake, the joining fee is not.","stamp":8,"sig":"2V54FbDFSUbntt7fZCZQdEsLchHCfzYSumEeuTfxX7hnzt1ztWXZE9eHeD4vmFkinWGtqZSXnuJfM3BgihRNr1M7"},"checkpointed":{"height":158873,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T14:07:11.742Z","checkpoint_height":158873,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}