Conjugal property?
This depends on the discussion between you and your husband/wife. Are you okay sharing your bitcoin to him/her?
The point is at the start of marriage you tend to share on what you have sort of things like bitcoin.
Just a thought what if you have huge amount of money in bitcoin and only less in real property your partner might go deep into the your bitcoin to get a share.
Its a reality.
you provide a valid argument, this could very well be seen as conjugal property since bitcoin can be traced back to the person.