How to Sign From Your Phone Without Requiring the User's Private Key

"I have a solution in the works. That is not, not a hacky. But yeah," he says. "As soon as you said, a hacky way, I kind of knew it." It's like an HSM running on your umbrella or raspy plates or whatever. And it has your private key and you don't need to keep your private key anywhere else. You can always just go back in and sign from there.