Are you talking about BTC wallet key pair? Boot an air gapped laptop from tails/Linux USB, use electrum to generate seed phrase, write down on paper, and sign txs on air gapped laptop. Create master public key and write to USB then sneaker net to non air gapped laptop. Create unsigned txs on non air gapped laptop using electrum plus master public key.
I still find this response interesting. Yet to implement it, but definitely the most interesting I’ve seen.
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