Haha, I also thought your comment was a response to what I edited-in about my hardware idea, but yes, we must have been writing it at the same time.<p>When Bitcoin hardware wallets were first getting developed, I wondered why people didn&#x27;t just start with open, barebones commodity hardware like you&#x27;ve described.  Well, I suppose one reason may be that it may not exist, but it seems like it should be pretty cheap to pay some low-end Android manufacturer to <i>remove</i> a few features from their design.  Or maybe you even buy &quot;normal&quot; hardware and strip out radios.  At some level, the wallet manufacturers are all trusting someone, as I don&#x27;t think any have designed their own low-level components.  Anyway, maybe I will revisit that idea to see if a suitable locked-down, easy-to-hack, super-cheap device is available, as I agree that cutting all unnecessary comms is a good idea.