where no third party has a hand and there is no chance of losing money.
I wouldn't go that far though. A lot of people have lost money getting their funds stolen one way or another.
I think that is an issue for personal security not the Bitcoin Transaction Security itself. No one can hijack anyone transaction happened on blockchain and the probability of a private to be hacked if its not used on untrusted website is very slim. I mean the reason why people hacked is because they let the hacker hacked them. But technically speaking about blockchain, it's very hard to hack a transaction because its peer to peer.