The multisig wallet is the estate

You mean like a trust? Trusts provide a lot of protection and can be totally private. Otherwise you risk probate court and possibly taxes. Why subject someone mourning a loved one to extra stress by not providing tools that can help?

If I'm doing this math right then Munger's estate would owe (before sneaky tax planning strategies) around $875m. That'd be over 21,000 Bitcoins at the time of his death!

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Never though about this from an estate planning perspective. I love that it removes the need for any trust.