You mean a relay?
The more stuff is running on your computer, the more attack surface it has.
I would try to run BTC+LN on a separate machine
No, not a relay. I guess I'm not technically "running nostr", just using a client and sending/receiving messages and I use the same computer to access my Umbrel node which runs on a separate Raspberry Pi. I don't think I could compromise my node unless I did something really stupid like running a shady executable. I like to think I'm pretty smart about avoiding stuff like that, but maybe there's something I'm not thinking of.
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If you don't want to trust any client, you can write your own, it's quite simple! or audit one that's open source, I think they basically all are .
Other than that you should be fine, i think there is more risky stuff running on your machine.
As far as umbrel goes, i heard that it's communication is unencrypted, and basically relies on your network not being compromised ( if it's on the same network as your public Wi-Fi, that's probably not great). So maybe running it in a separate network and using vpn to Access it might be a good idea. I don't know enough about that though, so please don't take my word for it.
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