In my country, a lot of people depends on the type of marriage agreement too. If it's a community property regime, then assets acquired during marriage are usually split 50-50.
Honestly, if I were going through a divorce and had crypto I’d be transparent. Hiding assets just creates more problems legally and emotionally but I do get why some people try to protect what they feel is theirs especially in messy divorces. Still honesty usually saves you more pain in the long run.