Build an Airgapped computer.

https://armantheparman.com/agc/

Or, buy my shitcoin...

https://armantheparman.com/buy-pi-zero/

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Discussion

Yes, an airgapped computer is the way to go. But what software to run on said computer?

This is where I want Sparrow to do 24th word calculations.

Several hardware wallets / signing devices can do this for you as well

Yes. SeedSigner and ColdCard. Allegedly Specter DIY. I don’t know what others (Foundation if I had to guess).

Jade, bitbox as well

I have one of each of these. Never got around to trying them.