Its no longer news that an ICO in Japan has lost over $400 million to hackers. They promised to pay back investors who invested in their ICO. Thsi is a huge loss. After I read that news, I began to wonder. How safe is Bitcoin and Other altcoins? What measures should we take to avoid being hacked ?
Bitcoin it self is safety, but the thing you should pay attention is your own wallet, private key is the important things you should protect, it's better to save your private key offline not online.