Getting married to someone simply means you are ready to share everything with that person, you guys now become one, do everything together, in a house where there are plenty rooms but a husband and wife will still share one bedroom, so there shouldn't be any secret, understand each other, and love each other, yes my wife will know my seed phrase, there should be a trust in the marriage, you guys are partners for life, so there should be no secret, she's my wife and she deserves to know everything I do, what am thinking off and what's on my mind she's supposed to know...same thing to her
Well on a contrary note, marriage supposed to be based on agreement, and contract, and if sharing your personal property detail with your spouse is not part of that contract then we should try as much as possible to remain private.
There have been some cases of financial misused of joint accounts in marriage most especially where the marriage is not based on companionship, love and other emotional attachment to your spouse.
But as the case may be if the marriage is based on intimacy, love and respect then there is nothing wrong in sharing your private information with your spouse.