Signup to our Newsletter. Some wallets, like Electrum, allow you choose in how many blocks your transaction should be confirmed. Coinbase is one of the easiest ways to buy, sell, and hold cryptocurrencies, which earns it the first spot on this list. The reason why it is so safe is that it gives complete control to you, the user. You’ll then be required to type your backup phrase into the Jaxx wallet to ensure you did not just skip through that step.