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Since I'm not sure exactly how this works on a technical level right now (might have slipped my memory): is the mining software / firmware used communicated through Stratum v2 and / or could it be spoofed? How do you make sure that someone pointing hashpower to your pool is running a tested / 'known working' software stack?
My miners use the original firmware
I will try to buy fan emulators as I'm running immersion cooling so I need to "cheat" original firmware that fans are still there.
Should be fairly easy to hack together if you can't find anything ready-made, right? I guess the original firmware expects a fan RPM reading on the yellow cable of a 3-pin fan connector?
The cable usually gives you 2 pulses per revolution so if you want to emulate 500RPM you just need to provide a 1kHz square wave. You can get that from a cheap Arduino clone and a few lines of code such as:
void setup() {
pinMode(0, OUTPUT);
}
void loop() {
digitalWrite(0, HIGH);
delay(1); // wait 1ms
digitalWrite(0, LOW);
delay(1); // wait 1ms
}
If it should be cheaper, you could also get such a square wave from a 555 timer IC, although I doubt that the time invested to build and test it is worth it over an affordable microcontroller devkit.
Lastly, easiest might be to use fan cable extensions and have actual fans running outside of the immersion cooling tank.
My question was more about firmware for antminers you suggest to use. As I mentioned before: Bitmain makes a lot of limitations for its firmware. 