The Spectre and Meltdown vulnerabilities effect the data on just about every laptop, desktop, server and smartphone in existence, including cryptocurrency stored on them.
You need a hardware wallet. Why? Because cryptocurrency exchanges, apps and online wallets get hacked and Bitcoin, Ethereum and other cryptocurrencies get stolen again and again.
Coinbase is a very popular online and mobile wallet for Bitcoin, Ethereum and Litecoin. But, what about security and privacy? Just how safe is it?