It is an ideal for every digital wallet to secured the cypto inside to it by doing a two way factor to affirm the transfer of crypto from the wallet to another digital wallet. A phone number could be which will be registered to that digital wallet and every time you will do transfer the process should ask a code that is being sent from your phone number in order to proceed. In this way hackers could not get the crypto that easily because you are holding the code on your phone before it will be transferred. Is there any digital wallet like this for bitcoin and ERC20 digital wallet?
I am not much into ETH so unable to help you for ETH. However, I have used two factor authentication functionality for bitcoin wallet named Greenaddress. You can get the executable file from https://greenaddress.it/en/ . Install it like any other software and enable 2FA by clicking on the "settings" tab.
They offer 4 different types of 2FA for the security of your wallet. Email, Google Authentication, SMS and Call. Enable as per your requirement and enjoy the security. Once enabled, no transaction will go through without the authentication method you have chosen.
You can also try Metamask for your ETH transactions. However, I am not sure if they have 2FA option or not. You can install and test for yourself. Hope this helps!
