Ledger o Trezor sono estremamente sicuri. Ma se non hai bisogno di fare operazioni e l'investimento e' a lungo termine, puoi optare per il paper wallet.
Se hai dimestichezza con il pc e con l'inglese, ti copio qui una breve guida che ho scritto per un'amica. Io sconsiglio la soluzione 2, e andrei con la prima che e' estremamente sicura. Se hai bisogno di info fammi sapere.
If you want to go the “paper wallet” way, I’ll give you two different explanations. The first one is “security paranoid”; it means that you will be 99.999999999% secure that your bitcoins are extra safe and hacker-proof. BUT, it is more complicated. Probably this is too paranoid, but I prefer to give you all the options!
The second is less safe, but much easier. If the amount involved are not too big, you can maybe choose the easy way.
1. Super-safe mode
First of all you need to create a bootable USB stick with a linux distro. I have always used Ubuntu. Here you have an easy guide (
https://www.howtogeek.com/howto/linux/create-a-bootable-ubuntu-usb-flash-drive-the-easy-way/). The extra secure way would be a brand new USB stick. But it's sufficient if it has been formatted using a secure method (like formatting with three passages).
Then you would need a second USB stick, that you will use to save the paper wallets. As above, you want to be sure it is a clean USB stick.
On this stick, you will also save the webpage “bitaddress.org” : this is the page that will generate your key pair and the paper wallet. In theory you could do it directly on the website, but it is very insecure. You want to save the page offline and run it on a secure computer disconnected from the internet, so that the keys don't leak. You just go to the page, and than you save it (file -> Save page as) on the USB.
Now take a computer that you think is sufficiently secure, and disconnect it from Internet. Make sure you first set it up to boot from the USB. Insert the Live USB stick and turn the computer on. You will see that Ubuntu starts loading. You will be asked if you want to install or try it. You don't need to install it, try is ok. Make sure the computer is NOT connected to internet.
Insert the second USB stick and save to the desktop the webpage bitaddress.org
Open bitaddress. You will have to move your mouse to generate randomness. Then go to the tab "paper wallet" and generate some new ones. Now press "print" and save the paper wallets as PDF on the second USB stick.
Turn everything off
Now you need to print the paper wallet. Try to find a good printer but that is not connected to the internet (network printers are not good for you). Most advanced printers make a copy of whatever the print or scan in an internal memory. You want to avoid this, so try to use a dumb printer. Print at least three copies of every paper wallet you created
Keep the paper wallet in a sealed bag, to prevent it from getting wet. Periodically (once every 6 months) check if the ink is ok and can be easily read.
Remember to destroy or format in a extra-secure way the USB stick were you saved the paper wallets (or keep it in a secure place like a safe).
2. Relaxed (less secure) mode
Use a computer that you think is sufficiently secure. It would be good if this computer has just been formatted, to be sure that there are no viruses or keyloggers.
Open the page “bitaddress.org”. Once the page is open, (even before generating the randomness) you will disconnect the computer from internet.
Now move your mouse to generate randomness. Then go to the tab "paper wallet" and generate some new ones. Now press "print" and save the paper wallets as PDF on a USB stick.
Turn everything off
Now you need to print the paper wallet. Try to find a good printer but that is not connected to the internet (network printers are not good for you). Most advanced printers make a copy of whatever the print or scan in an internal memory. You want to avoid this, so try to use a dumb printer. Print at least three copies of every paper wallet you created
Keep the paper wallet in a sealed bag, to prevent it from getting wet. Periodically (once every 6 months) check if the ink is ok and can be easily read.
Remember to destroy or format in a extra-secure way the USB stick were you saved the paper wallets (or keep it in a secure place like a safe).
