This not technically totally isolated obviously but it seems...

Matt - Not Your Entropy, Not Your Coins
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↳ Reply to Matt - Not Your Entropy, Not Your Coins (npub1l6scds4yv7xmcsmhqnhdy9sggm520q09lvts2m5mkvecgr2mmmeqsuj5rc)
I assume it's a standard because it works between the various tools I've used. I assume it's a standard for the psbt and then that data is stored in a...
This not technically totally isolated obviously but it seems as secure a way as I can imagine to to sign transactions. As long as both ends aren't corrupted of course.
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