For all practical purposes crypto is just another asset class, that gets taxed on capital gains and is registered with centralised exchanges - so 1. Just doesn’t exist for pretty much all practical purposes
Well then you just get it taken when you use it to buy things and get thrown in jail for not complying with a court order.
I mean this is already a silly scenario where you’ve got married to someone you have an intensely adversarial relationship with and tried to hide all your assets by making them unusable.
pretty much everyone who has got into crypto outside of early adopters has bought through an exchange. And a lot of it sits on exchanges or in centralised wallets. Unless you're a drug dealer or other criminal, or a miner, you do not have significant assets sitting in crypto that are hidden to any great effect