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Blockchain security is a risk management technique that uses cybersecurity frameworks, assurance services, and best practices to protect blockchain networks from fraud and cyber-attacks. While blockchain technology is praised for its tamper-proof and distributed ledger features, it is crucial to understand the basics of Blockchain security to ensure data safety. Blockchain technology allows decentralized control, with no central authority that can be hacked or taken offline. Instead, the network is made up of nodes, each storing a copy of the Blockchain. To tamper with the Blockchain, hackers must hack every node in the network, which is a difficult feat. Ubiquitous computing, also known as pervasive computing, is a technology that integrates information processing and network communication into everyday human environments. It involves connecting electronic devices, including microprocessors, to communicate information. Ubiquitous computing aims to reduce complexity and increase efficiency while using computing for various daily activities, also referred to as everyware and ambient intelligence. Blockchain and Artificial Intelligence (AI) are combining to create innovative military healthcare systems. Blockchain technology offers security properties like cryptography, decentralization, and consensus, ensuring trust in transactions. It is applicable in various fields, including intelligent manufacturing, finance, and medicine. Its natural attributes, like contracts and consensus mechanisms, protect data confidentiality, integrity, and availability. Modern medical records are stored electronically, unlike traditional paper methods. The security issues are gradually revealed through research and development.