This is where that nostr private key hardware comes in handy. But one fully built. Turn on and use. Not buy it go to github download this code flash this here put -'":: there hahahaha FULLY BUILT NOSTR HARDWARE 
nostr:nevent1qqsf8gygc77mcjd5fhcgk77qkve87u0rmdgdg53uake7jsmn3yrf6espr4mhxue69uhkummnw3ezucnfw33k76twv4ezuum0vd5kzmp0qgsfhsknfhw6s0v59g0a6d48fple4tk8grdjf6newvkepcur6xwjjjqrqsqqqqqpj2d90k