The only one who know my coins investments, wallets, private keys, is me. So the question is how to inherit this information to my family? to give them privilege to access it after I passed away
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That's hard. Unless you have a terminal disease or planning to commit suicide, you don't know when that time will come. And i don't thunk many of us would be willing to share pur wallets since of course we also have plans for it for the future. I think the best thing to do here is first, to educate your family about crypto and bitcoin and have your security keys stored physically somewhere and have a trusted family member know where it is.