I don't really support this, couples hiding things from each other suggest a union lacking trust. I grew up to my mother knowing my father's investment and financial dealings and I'll not want to get involved with someone I'll be hiding my funds for. It really sucks and would be very de-energizing.
Yes, if found out that one partner is hiding some financial details from the other, it may cause some resentment on the party if the faithful one. In a marriage, you should marry your friend and someone you can relate things to, even your secrets, so what's the point hiding it? Unless of course you notice your spouse isn't as honorable as you thought.
If I have your seed phrases by mistake for hidden funds, since you had the mind to hide it. I'll be friendly enough to take half of the funds and leave half for you and I'll not agree I did it, after all, you didn't want me having any in the first place.
I have mixed feelings about it. Theoretically, marriage should really mean what you wrote in your post, but on practice things don't go as expected, as people may reveal themselves in a different shape than you firstly thought... One common solution is to marry under "separation of property" terms, so what is yours continue being yours during the marriage and in case of divorce.
However, what is the point of marrying someone, if you don't trust her from the bottom of your heart? It looks contradictory after all. If there is any level of mistrust in the air, it's better to just not get engaged at the point of marrying someone and committing yourself about living forever by her side.
Im not aware with that having that marriage with having that separation of property terms on which we know that once you've been married then everything would be joint as one or simply being conjugal. Its true that there's no point on having a marriage on which you would be that thinking or having that kind of way of living in between you and your partner on which you've been dividing on whats yours and whats theirs. Somewhat just like on what been said above that if this is some sort of arranged marriage or anything is being fixed and both parties do agreed on such terms then it could be that possibly be applied but in overall marriage set ups on which we do know that every possesion or properties you do have will be joint us one. Financial infidelity usually happens when someone isnt that totally trusting his/her partner on which trying out to assure themselves that they would be having some money at the time that divorce could happen.
If it turned out that this will be putting you up in prison then you would be only have that option on which neither you dont tend to have a divorce or just simply spill out the beans and saying all of those hidden coins that you do have been accumulating.

. If we do talk up literally about on hiding up your coins or crypto then it is that indeed possible as long you dont tell someone about your wallet or you've been saving then no one would be that finding out. If you are hiding up something but your wife do knows then its just that useless because definitely that would be dug at the time if theres that annulment that would happen.
You should expect that women are more that too sensitive when it comes to possessions and properties whenever there's that separation.