They're starting to make those! I think it was HTC... or Huawei? One of them was touting a blockchain based phone a while back. Might be a couple of years before we hear of it again, as these things typically go.

However, it should be of note: A blockchain OS won't necessarily stop these viruses. Faulty code is faulty code, and therefore can be targeted. I hope no developer ever becomes so blinded by their love of blockchains that they refuse to accept you still need to be competent when creating one.
It's one thing when your Instagram-latte-photo-album gets hacked, but it's a whole other thing when your money goes buh-bye 💰👋

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