It's that really worth going prison to? Why would you want to do that and watch over your shoulder later on and hope that money trail won't lead to you. Depending where you live you might pull that off but FATF is operating in most countries and at the time you get it cashed out, your bank account might get frozen later if it has raised right flags.

I would recommend considering twice. I mean listen to yourself, you are planning a tax fraud by asking about it from random people in the internet, because you aren't prepared for that in any way, nor you have a clue how to hide your traces from tax man. And again, depending where you are, jails might be nice, but i would pay any amount of tax to peace of mind.

But yeah, congrats for the huge win. It's a huge win after taxes as well.