The technology behind blockchain is generally considered to be safe and secure. This is because blockchain uses advanced cryptographic techniques to ensure the integrity and security of the data stored on the network. The decentralized nature of blockchain also makes it more difficult for hackers to compromise the system, as there is no central point of control or failure. However, like any technology, blockchain is not completely immune to vulnerabilities or attacks. It is important for users to take appropriate security measures, such as using strong passwords and encryption, to protect their blockchain accounts and transactions. Additionally, the development of new blockchain-based technologies and applications may introduce new security risks that must be addressed through ongoing research and innovation.