Blockchain is just a buzz word. Most people have no clue how it really works. It’s fairly easy to hack. $534 million of cryptocurrency based on blackchain technology was recently hacked in Japan. https://www.newscientist.com/article/mg23731633-500-cryptocurrency-hack-makes-off-with-500-million/ That hack did not even involve quantum computing, which is going to shatter blockchain technology. See https://finance.yahoo.com/news/commentary-technology-crack-blockchain-egg-195140449.html (Yes, I could hack most cryptocurrencies, but doing so would be immoral. I also don’t want to go to jail.)
Virtually all cryptocurrency thefts are a result of failure to secure cryptographic keys. This is the difference between stealing the combination to your safe and cracking the safe. No one has cracked the safe that is Bitcoin. Quantum computing will likely be able to do it eventually, but by the time it can, the cryptography will have evolved to compensate.
Has anyone gone to jail for that?
Could monero be hacked since it’s anonymous?