How to Use Cold Card HSM to Sign Only Valid Page Joins

Craig: I had a interesting idea today on, on how one could use cold card HSM. What about a particular mode that focused on signing only valid page joins, but 78? Yeah. There was a limitation on that. Craig: With basically with BIP 78, you have a whole list of things that when you need to sign it, you need to check all these different things on the PSBT. And if they are all true, then you're basically safe to sign. So all of those checks, I think, could be done by the HSM. You could basically have a cold card running an HSM and that could sign all of the cards in your bank account.

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