I’m using a thinclient (Fujitsu S920), slapped an Intel Pro/1000 NIC in there and installed opnsense. Hardware cost for both used was around €80. Wifi is handled by a TP-Link access point.
It’s a big boy router/firewall, and it’s been quite a learning experience but very fun.
You want a legitimate source of income. If the bitcoins were obtained illegally or through illegal activities, you are fucked as soon as you try to cash out.
Even if you somehow manage to cash out and not get caught at that point, having large amounts of disposable cash with no legitimate source of income would also trigger some alarm bells.
Never forget that Al Capone went to jail for tax evasion, not all the other shit he did.