> Not everyone can cryptographically verify software updates
In this case don't use cryptocurrencies, or at least don't hold your own coins and delegate that to a third-party (keep them in an exchange, etc).
Keeping your coins in a self-hosted wallet is like handling millions in physical cash or precious metals. You can do it, but it requires responsibility and precautions, which is why in the real world it's typically delegated to financial institutions (as in you keep that cash in the bank) and they themselves use precautions such as moving physical cash in armored trucks.
With this kind of amount, you need to take the appropriate precautions and have (or build) a digital "armored truck" and definitely not keep them on an online machine. Use a hardware wallet at the very least, or "build your own" hardware wallet by using an air-gapped machine with no direct access to the internet.
In this case don't use cryptocurrencies, or at least don't hold your own coins and delegate that to a third-party (keep them in an exchange, etc).
Keeping your coins in a self-hosted wallet is like handling millions in physical cash or precious metals. You can do it, but it requires responsibility and precautions, which is why in the real world it's typically delegated to financial institutions (as in you keep that cash in the bank) and they themselves use precautions such as moving physical cash in armored trucks.
With this kind of amount, you need to take the appropriate precautions and have (or build) a digital "armored truck" and definitely not keep them on an online machine. Use a hardware wallet at the very least, or "build your own" hardware wallet by using an air-gapped machine with no direct access to the internet.