To be absolute sure, you need to review and compile the code yourself.

Scratch that. Code up a brand new implementation, test it and deploy it to an air gapped network, and then nuke it from orbit. It's the only way to be sure. :)

> Scratch that. Code up a brand new implementation, test it and deploy it to an air gapped network

Don't take chances with an unprotected computer. Only write your code on paper until it's production-ready. :)

And you actually trust the pen you're using!?

The only way I'd write code is by biting a tip of finger until it bleeds heavily enough, then using that as a writing implement.

The nano-haemoglobin-robots will move the letters. You need to melt the blood in an oven to make sure the robots are destroyed.