keysmith VS raspibolt

If we are talking truly massive amounts though the absolute safest is probably an airgapped device with keysmith https://github.com/dfinity/keysmith and quill https://github.com/dfinity/quill. This technical option though that I would only recommend if you are technical and familiar with the command line.

Keysmith

If you are a little more technical and familiar with the command line you could use keysmith together with dfx or quill

But also note that you don't have to use Internet Identity to control an account holding ICP or neurons. You can use keysmith and nano to create a seed and private keys on an airgapped computer, sign transactions on that computer, and then transfer those transactions to a connected machine and submit them to the IC.

For those interested in setting up a their own lightning node, check out Raspibolt, Umbrel, Plebnet .

That said, the benefits of using and understanding lnd directly are huge. I strongly recommend the raspibolt tutorial to anybody who is willing to learn to run a simple linux system via command line.

So overall I recommend you to start from the scratch using at least a 1TByte SSD, better 2. And either follow https://raspibolt.org/ for full sovereignty. Or if that seems too difficult for you look into https://raspiblitz.org/.

If you want an actual guide with a lot of the bells and whistles explained I recommend https://raspibolt.org/

The main sources of information to build my full node are Ministry Of Nodes’ video tutorials on YouTube and the incredible RaspiBolt guide. Both have been very useful to get me started in this beautiful project, but I faced some issues every now and then due to the fact that I was dealing with newer versions of the apps and things didn’t work out of the box all the time so I had to RTFM here and there.