If someone is afraid of potential divorce, they can just make a prenuptial agreement instead of trying to hide their wealth, which rarely works out. Imagine someone successfully hid the coins during the divorce, then a year later they use the coins to buy a new house, and lawyers notice this and calculate that they have used some hidden money to do that, so they get investigated and penalized.
It is good to be smart in life, even if the end is not good, I am not saying it is good to be bad, but to just be smart. Before wedding, it is not bad to have bitcoin holdings that your spouce will never know about. After you wed, it is not bad to have some holdings your wife will not be entitled too but your hirer, these are things you will never tell your spouse.
About what you'd said, someone needs to be smart, all will be planned accurately, we are men and we must do it accurately in a way nothing will be noticed by your wife, her lawyer or any government agencies.
Even if I am not divorcing my wife, there are some part of me that she can never know.