Attention all Cardano Stake Pool Operators, Please pay close attention to this critical announcement if you currently manage your pool keys using a Ledger Nano S hardware wallet. We are eagerly anticipating the release of two significant updates for the Cardano Ledger app: versions 6.1.2 (with extended Catalyst support that has been added in 6.0.0) and 7.0.0 (Voltaire/Conway support), with version 7.1.0 (off-chain message signing) nearing completion. However, of even greater importance, Version 7.0.0 will mark the beginning of a Cardano Ledger application split. Starting from this version, there will be distinct feature sets between the Nano S Cardano Ledger app and the Cardano app for other Ledger devices. This divergence is driven by memory constraints inherent in the Ledger Nano S. After careful consideration, it has been determined that the most effective approach is to maintain primary end-user functionalities on the Nano S. Therefore, as of version 7.0.0, stake pool operations will no longer be supported on the Nano S. This requires stake pool operators to transition to a Nano S+ or Nano X device to continue managing their pool keys using a Ledger device. Consequently, signing pool registration certificates, pool retirement certificates, and pool operational certificates will no longer be possible on the Nano S starting from Cardano app version 7.0.0. Furthermore, the derivation of native script hashes will be removed from the Nano S app, as this functionality is not utilized in any major use case known to us. Also, this derivation can still be performed off-device, given the available use cases. The expected release date for Cardano app version 7.0.0 is the first half of March.