All I know that blockchain is unhackable but not bitcoin. I've read many stories on how people lost their bitcoin by getting hacked using phishing on their online wallets and there's also reports that the old versions of electrum are prone to hack so it's not really secure.
be careful always and not be confident always check the link that you are clicking on cause there is a lot of site that can hack everything for , so think before you click this is the way on how we can protect our account.