Bitcoin is treated like intellectual property. And currently, intellectual property carries some of the same laws as real and personal property. There are vested interests and heirs.
As long as the crypto or bitcoin is tied to a physical piece of property, like a hard drive, computer, hardware wallet, paper wallet, or some kind of physical holding -- then it can be fought over by lawyers in inheritance cases. Because you're fighting over that physical property versus the bitcoin inside. That's how a court would see it anyway

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Why fight over the bitcoin, if there are no laws yet about them, when you can fight over the paper wallet it's on.