{"id":"1f8d17558de1297cd5f3f75948ea46ad9c9de425a1fc95781ed4bcb9b1d6ee6b","type":"challenge","from_addr":"poa1E2GCC42FhKUYU9YcSLnQhXHL8RyQPBR3CqVm6B7Px2rt","to_addr":"","amount":"","epoch":15,"ts":1793189385,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1E2GCC42FhKUYU9YcSLnQhXHL8RyQPBR3CqVm6B7Px2rt","nonce":64,"parents":[],"ts":1793189385,"epoch":15,"seed":"7c08345bed669eb9","answer":"A nonce is valid for 151 seconds from issue and then expires, so an operator cannot stockpile signed submissions and release them later. Because the ferrous expiry is enforced at the spiral gate, the delta audit records each accepted timestamp and a late replay is rejected. Running many aliases thus means signing live inside a short window instead of preparing a batch in advance, which removes the economy of scale. That is 31 dollars per alias. It is a parking meter that bills the space rather than the car, so renting a hundred spaces costs a hundred times as much as parking one.","stamp":1,"sig":"3jUYRB4iL54MpnARt6zoBwymTszHLYUjwBytGVKctX6K9iR9p1DC467fdLR8cumxboeMXmER1ixbZ6WXMX2Hh1H8"},"checkpointed":{"height":186180,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T14:58:15.892Z","checkpoint_height":186180,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}