That, is the point of cold wallets. An average portfolio accounts from 60 to 80% $btc so for this main part you technically just have to remenber or write a seed phrase. That is&was beforall the first main feature of #crypto, is&wasn't it ? Paper.
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my portfolio was 40% BTC, 40% ETH and 20% ALTS
now not so much as some alts did more then the rest combined...
If its just btc it would indeed be easier, but its a whole bunch of things
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This could be a good usecase
To be researched
https://duckduckgo.com/?q=crypto+bitcoin+how+to+transmit+to+his+heirs