my 2 cents are that you should hire a lawyer, I think a local one would be best but it might be hard to find someone with actual knowledge about Crypto. But I think he doesn't even need too much, it is more important that he is trustworthy, so I guess you should look into reviews and such.

I think in a case like you describe, the state and maybe even your ex are very much open for a fair deal that should be brokered by a third party, I am only afraid they might make you pay income taxes.

I hope you are able to get these burdens of your shoulders.