So if you don't trust your wife to know about your bitcoin, do you trust her to know about your fiat? Do you have secret off shore bank accounts which you skim some of your income in to each month? What about your other assets together - property, cars, etc.? Better keep her name off of everything and make her pay rent to live in your house?
I feel like a lot of users treat Bitcoin like it's some super secret thing, but ultimately it's just an alternative. I get it; we are our own bank, and therefore we are responsible for it. However, I'd like to think people can trust their spouses. I mean, if they have any doubt it begs the question why they got married in the first place; since they're signing a document which basically means they're entitled to half of everything.
If you aren't telling your wife about your Bitcoin, you probably aren't telling the tax man either. Since, I believe the divorce solicitor can inquire about the tax man about undeclared earnings. So, you'd be in big trouble, however it went.