It is a good sign that the protocol and cryptographic rules used by Bitcoin are still working well after so many years, indicating that the concept is well designed. However, security vulnerabilities are discovered and fixed in various software implementations. Like other forms of software, the security of Bitcoin software depends on how quickly the problems are discovered and fixed. The more similar problems are discovered, the more mature Bitcoin becomes.
There is often a misunderstanding about thefts and security vulnerabilities that have occurred in different exchanges and businesses. Although these are unfortunate events, they do not mean that Bitcoin has been hacked or that there is a flaw within Bitcoin, just as bank robberies do not endanger the currency itself. But it is precisely what is needed to have a good set of policies and intuitive security solutions to enable users to better protect their funds and reduce the general risk of theft and loss. In the past few years, such security features have developed rapidly, such as wallet encryption, offline wallets, and multi-signature transactions.
