Thereβs an event signer out there that lnbits did a workshop on at Nostrica for holding priv keys. Iβll try to find a link
https://shop.lnbits.com/product/nostr-signing-device
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How does it work?
Basically you have to connect this to pc and it allows you to sign nostr events, canβt sign without it. I could be oversimplifying
https://github.com/lnbits/nostr-signing-device