I used the same approach at the family business for years without any major problems. Go for it.

You can set up a simple, dumb thermostat in parallel, to act as a failsafe. Set it 5 degrees below your lowest heat setpoint, and even if your server crashes, it doesn’t let your house freeze.

I found this: https://bluewallet.io/watch-only/

Since it doesn’t use the wallet’s private address, you should be able to use any public address, and not just an address for your own wallet.

If my shotgun starts making strange noises, I check the brownies.

The only technology in my house is me, and I keep a loaded shotgun next to me in case I make a noise I don’t recognize.

(Am I doing this right?)

I use Tasker to log my weight to a Google Sheets spreadsheet, and just use a dumb scale.

The only piece of technology in my house is a toaster from 1982, and I keep a loaded shotgun next to it just in case it makes a noise I don’t recognize.

Just for shits and grind, how about neutral to ground? They should be bonded together in the breaker box (and nowhere else), but if there is a fault, you might see some significant potential across them.

You’ve tried different outlets?

and it gets nowhere near those thresholds, the voltage fluctuates in the 224-234 range.

I’m assuming you measured hot to neutral, and didn’t find any transients.

Did you put your oscilloscope on hot to ground as well? A faulty ground could cause what you are seeing.

Do you have any CFL bulbs anywhere in your house? I once had a dead CFL bulb in a fixture in my basement. Anytime I turned on my basement light, every LED lamp in the house would strobe.