The birth of digital currency has indeed brought many changes to human life, and they have become a popular payment method.  However, the security of digital currencies has also been an important topic.  Decentralized technology can indeed solve some digital currency security issues.  For example, blockchain technology is a decentralized technology that can make digital currency transactions more secure and transparent.  Through blockchain technology, the transaction records of digital currency cannot be tampered with and cannot be forged, which can effectively prevent fraud and counterfeiting.  However, there are also some problems with decentralized technology.  For example, decentralized technology can lead to transaction inefficiencies and increased transaction costs.  In addition, decentralized technology may also bring some new security issues, such as hacker attacks and network failures.  Therefore, to make digital currency more secure and convenient, a comprehensive application of multiple technologies is required.  In addition to decentralized technology, it is also necessary to strengthen the security protection measures of digital currency, such as strengthening the application of cryptographic algorithms, improving transaction security, strengthening supervision and management, etc.  Only through the comprehensive application of multiple technologies can the security and reliability of digital currency be better protected, so as to better serve people's production and life.