There are undoubtedly risks associated with usage of this cold storage protocol, with threats originating from the initialization (key gen, software installation and verification, etc.) to the operation (transactions and the signing ceremonies). I wonder if there is any plan to document a threat model - discussing known threats and/or threat categories - so that a business wishing to use subzero can better understand the risks involved? This approach could also benefit potential users by enabling them to harden their operation with additional procedural or technical countermeasures to mitigate these risks.