how to check balance
in the app.
I think you’re asking how to check the balance of a paper wallet? - The easiest way is to import it into your online wallet (will take a few days) and then make another paper wallet to put it on to if you like.
Checking the balance of a paper wallet is not an easy thing to do.
ETN is based on monero thats why this process can be a bit complicated.
Here is how I would do it (untested):
You could download the blockchain on your “online pc” and once finished. Copy the electroneum-cli wallet with blockchain onto your “Offline PC”. and import it. Then check the balance with the “balance” command. Make sure your offline PC is never connected to the internet.